CITICORP
SC 13D/A, 1998-02-25
NATIONAL COMMERCIAL BANKS
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<PAGE>
 
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                 SCHEDULE 13D/A
                                 (Rule 13d-101)

           INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO
           13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(a)

                               (Amendment No. 3)*

                             SYBRON CHEMICALS INC.
                                        
                                (Name of Issuer)

                          COMMON STOCK, $.01 PAR VALUE
                                        
                         (Title of Class of Securities)

                                  870903 10 1
                        --------------------------------
                                 (CUSIP Number)

                             DECHERT PRICE & RHOADS
                            4000 Bell Atlantic Tower
                                1717 Arch Street
                             Philadelphia, PA 19103
                    Attention:  G.Daniel O'Donnell, Esquire
                                 (215) 994-2762
                                        
(Name, Address and Telephone Number of Person Authorized to Receive Notices and
                                Communications)

                               February 11, 1998
                       --------------------------------
            (Date of Event which Requires Filing of this Statement)


          If the filing person has previously filed a statement on Schedule 13G
to report the acquisition which is the subject of this Schedule 13D, and is
filing this schedule because of Rule 13d-1(b)(3) or (4), check the following box
/X/.

          Note:  Six copies of this Statement, including all exhibits, should be
filed with the Commission.  See Rule 13d-1(a) for other parties to whom copies
are to be sent.

          *The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.
 
The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                                      -1-
<PAGE>
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 2 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

399 VENTURE PARTNERS, INC.

I.R.S. ID NO. 13-3413727
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   Delaware
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         2,025,000
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       2,025,000
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    2,025,000
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    35.7%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    CO
- --------------------------------------------------------------------------------


                                      -2-
<PAGE>
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 3 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

Citibank, N.A.

I.R.S. ID NO. 13-5266470
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /X/
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   Delaware
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         2,025,000
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       2,025,000
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    399 Venture Partners, Inc., a wholly-owned subsidiary of Citibank, N.A., 
beneficially and directly owns the 2,025,000 shares referred to herein.
Citibank, N.A. is a wholly-owned subsidiary of Citicorp.
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    35.7%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    HC
- --------------------------------------------------------------------------------

                                      -3-
<PAGE>
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 4 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

CITICORP

I.R.S. ID NO. 13-2614988
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /X/
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   Delaware
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         2,025,000
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       2,025,000
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    399 Venture Partners, Inc., a wholly-owned subsidiary of Citibank, N.A., 
beneficially and directly owns the 2,025,000 shares referred to herein. 
Citibank, N.A. is a wholly-owned subsidiary of Citicorp.
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    35.7%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    HC
- --------------------------------------------------------------------------------

                                      -4-
<PAGE>
 
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 5 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

RICHARD M. KLEIN
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   United States
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         470,551
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       470,551
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    470,551
    ----------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    8.3%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------



                                      -5-
<PAGE>
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 6 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

JOHN H. SCHROEDER
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   United States
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         67,482
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       67,482
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    67,482
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    1.2%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

 

                                      -6-
<PAGE>
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 7 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

PETER DE BRUIJN
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   Netherlands
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         8,745
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       8,745
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    8,745
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    0.2%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------


                                      -7-
<PAGE>
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 8 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

ALBERT L. EILENDER
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   United States
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         14,262
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       14,262
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    14,262
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    0.3%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------



                                     -8-

<PAGE>
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 9 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

JOE J. BELCHER
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   United States
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         18,863
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       18,863
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    18,863
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    0.3%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

                                      -9-

<PAGE>
 
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 10 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

STEPHEN R. ADLER
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   United States
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         17,453
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       17,453
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    17,453
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    0.3%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

                                     -10-

<PAGE>
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 11 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
   I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

   JOSE M. RODRIGUEZ
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   GREAT BRITAIN
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         15,271
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       15,271
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    15,271
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    0.3%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

                                     -11-

<PAGE>
 
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 12 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
   I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

   GERALD DELANEY
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   UNITED STATES
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         14,616
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       14,616
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    14,616
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    0.3%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

                                     -12-

<PAGE>
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 13 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
   I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

   DWIGHT TAMAKI
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   UNITED STATES
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         18,833
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       18,833
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    18,833
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    0.3%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

                                     -13-

<PAGE>
 
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 14 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
   I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

   ROBERT LOGIN
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   UNITED STATES
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         14,184
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       14,184
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    14,184
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    0.2%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

                                     -14-

<PAGE>
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 15 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
   I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

   AARD VANDENBERG
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   NETHERLANDS
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         2,512
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       2,512
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    2,512
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    LESS THAN 0.1%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

                                     -15-

<PAGE>
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 16 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
   I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

   HANS HUISKES
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   NETHERLANDS
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         2,685
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       2,685
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    2,685
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    LESS THAN 0.1%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

                                     -16-


<PAGE>
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 17 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
   I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

   HANS BRUGGNWIRTH
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   NETHERLANDS
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         1,686
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       1,686
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    1,686
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    LESS THAN 0.1%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

                                     -17-


<PAGE>
 

                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 18 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
   I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

   FRANK ZUNINO
- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   UNITED STATES
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         3,229
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       3,229
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    3,229
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    LESS THAN 0.1%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------
 
                                     -18-


<PAGE>
 
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 19 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

JAMES T. COMFORT, as general partner of a certain partnership

- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   United States
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         None
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       27,366
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       None
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       27,366
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    27,366
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    0.5%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

                                     -19-


<PAGE>
 
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 20 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

NATHALIE C. URRY, as general partner of two partnerships

- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   United States
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         None
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       47,866
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       None
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       47,866
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    47,866
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    0.8%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

                                     -20-
<PAGE>
 
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 21 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

WILLIAM T. COMFORT, III, as general partner of two partnerships.

- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   United States
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         None
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       47,866
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       None
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       47,866
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    47,866
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    0.8%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

                                     -21-
<PAGE>
 

                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 22 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

STUYVESANT P. COMFORT, individually and as partner in two partnerships.

- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   United States
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         3,000
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       47,866
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       3,000
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       47,866
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    50,866
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    0.9%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

                                     -22-
<PAGE>
 
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 23 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

SHAWNEE PARTNERSHIP

- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   Oklahoma
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         27,366
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       27,366
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    27,366
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    0.5%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    GP
- --------------------------------------------------------------------------------

                                     -23-
<PAGE>
 

                                 SCHEDULE 13D 
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 24 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

63 BR PARTNERSHIP

- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   Oklahoma
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         20,500
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       20,500
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    20,500
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    0.4%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    GP
- --------------------------------------------------------------------------------
 
                                     -24-
<PAGE>
 

                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 25 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

RICHARD M. CASHIN

- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   United States
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         117,310
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       117,310
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    117,310
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    2.1%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

                                      -25-
<PAGE>
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 26 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

MICHAEL A. DELANEY

- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   United States
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         1,800
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       1,800
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    1,800
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    Less than 0.1%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

                                     -26-
<PAGE>
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 27 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

A. RICHARD BLAIR

- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   United States
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         15,000
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       15,000
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    15,000
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    0.3%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

                                      -27-
<PAGE>
 
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 28 of 28 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

DELORES D. BLAIR

- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   United States
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         2,000
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       2,000
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    2,000
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    Less than 0.1%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

                                     -28-
<PAGE>
 
 
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
CUSIP NO. 870903 10 1                                   Page 29 of 29 Pages
- --------------------------------------------------------------------------------

1  NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

STEPHEN W. KLEIN

- --------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a) /  /
                                                                 (b) /X/
- --------------------------------------------------------------------------------
3  SEC USE ONLY
 
- --------------------------------------------------------------------------------
4  SOURCE OF FUNDS*
    BK, OO
- --------------------------------------------------------------------------------
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
    REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    /  /
- --------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
 
   United States
- --------------------------------------------------------------------------------
 
    NUMBER OF       7  SOLE VOTING POWER
     SHARES
  BENEFICIALLY         2,000
    OWNED BY                 
      EACH          ------------------------------------------------------------
   REPORTING        8  SHARED VOTING POWER
 PERSON WITH
                       None
                    ------------------------------------------------------------
                    9  SOLE DISPOSITIVE POWER

                       2,000
                    ------------------------------------------------------------
                    10 SHARED DISPOSITIVE POWER

                       None
- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    2,000
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN

    SHARES*                                                  /   /
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    Less than 0.1%
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*

    IN
- --------------------------------------------------------------------------------

                                     -29-
<PAGE>
 
                                   SCHEDULE 13D

          This Amendment No. 3 (this "Amendment") amends the Statement on
Schedule 13D, as amended by the Amendment No. 2 and the Amendment No. 1 thereto
(the "Statement"), originally filed by certain Reporting Persons (the "Original
Reporting Persons") pursuant to Rule 13d-1 of the Securities and Exchange Act of
1934, as amended (the "Exchange Act") to reflect the formation of a group by
such Reporting Persons with the purpose of effecting a transaction or
transactions in which certain of the Reporting Persons, through Sybron
Acquisition Corp., a Delaware corporation ("Acquisition") and wholly owned
subsidiary of Sybron Holdings, Inc., a Delaware corporation ("Holdings"), or
another entity to be formed by them, would acquire all of the issued and
outstanding common stock of Sybron Chemicals Inc. ("Sybron"), par value $.01 per
share (individually, a "Share" and collectively, the "Shares"), not presently
owned by them.

          This Amendment has been filed as the final amendment to the Statement
to update the Statement in light of recent events and to reflect the dissolution
of the group formed by such Reporting Persons.  Capitalized terms used and not
defined herein shall have the meanings ascribed to them in the Statement as
previously amended.

          Items, 2, 4, 5, 6 and 7 of the Statement are hereby amended as
follows:

ITEM 2.  IDENTITY AND BACKGROUND

          Paragraph (a) is hereby amended and restated in its entirety as
follows:

          (a) This Statement has been filed jointly pursuant to Rule 13d-1(f)(1)
     ("Rule 13d-1(f)(1)") promulgated under the Securities Exchange Act of 1934,
     as amended (the "Exchange Act"), by: (1) 399 Venture Partners, Inc., a
     Delaware corporation ("399 Venture"), formerly known as Citicorp
     Investments Inc.; (2) Citibank, N.A., a national banking association
     ("Citibank"); (3) Citicorp, a Delaware corporation ("Citicorp"); (4)
     Richard M. Klein; (5) John H. Schroeder; (6) Peter de Bruijn; (7) Albert L.
     Eilender; (8) Joe. J. Belcher; (9) Stephen R. Adler; (10) Jose M.
     Rodriguez; (11) Gerald DeLaney; (12) Dwight Tamaki; (13) Robert Login; (14)
     Aard Vandenberg; (15) Hans Huiskes; (16) Hans Bruggnwirth; (17) Frank
     Zunino; (18) James T. Comfort; (19) Nathalie C. Urry; (20) William T.
     Comfort, III; (21) Stuyvesant P. Comfort; (22) Shawnee Partnership, an
     Oklahoma partnership ("Shawnee"); (23) 63 BR Partnership, an Oklahoma
     partnership ("63 BR"); (24) Richard M. Cashin; (25) Michael A. Delaney;
     (26) A. Richard Blair; (27) Delores D. Blair and (28) Stephen W. Klein
     (hereinafter, each such person or entity may be referred to individually as
     a "Reporting Person" and collectively as the "Reporting Persons"). This
     Amendment relates to the dissolution of the group previously formed by the
     Reporting Persons for the purpose of effecting a transaction or
     transactions in which Acquisition or another entity to be formed by certain
     of the Reporting Persons would acquire all of the Shares not presently
     owned by such Reporting Persons.

          Information with respect to each Reporting Person is given solely by
such Reporting Person, and no Reporting Person has responsibility for the
accuracy or completeness of the information supplied by any other Reporting
Person and each Reporting Person agrees that this Statement, as amended, is
filed on behalf of such Reporting Person only.

                                     -30-
<PAGE>
 
ITEM 4.   PURPOSE OF TRANSACTION.

          Item 4 is hereby amended by the addition of the following:

          On February 11, 1998, the Reporting Persons were informed by the
Special Committee of the Board of Directors of Sybron, which had previously
recommended the Merger Agreement and the Merger described therein to Sybron's
stockholders, that the Special Committee had withdrawn its recommendation.
Although the Special Committee's financial advisor, Chase Securities, Inc.,
maintained its opinion that the proposed transaction was fair from a financial
point of view, the Special Committee nevertheless concluded that the terms of
the transaction were no longer sufficient.  Because of the Special Committee's
decision to withdraw its support for the transaction, the fairness opinion that
was issued by the Special Committee's financial advisor is no longer available.

          Although Acquisition and Holdings disagreed with the conclusion
reached by the Special Committee and continue to believe the proposed
transaction presented an attractive opportunity for Sybron's public stockholders
to receive a premium in cash for their shares which would have been supported by
a substantial majority of the non-affiliated stockholders, Acquisition and
Holdings have elected not to pursue the transaction without the support of the
Special Committee.  On February 11, 1998, pursuant to Section 8.1(e) of the
Merger Agreement, Acquisition and Holdings delivered a letter to Sybron
terminating the Merger Agreement.  A copy of the letter from Acquisition and
Holdings to Sybron is filed herewith as Exhibit 6 and is incorporated herein by
reference.  A copy of the Merger Agreement has been previously filed as Exhibit
2 to the Statement.

          The Reporting Persons hold approximately 50.2% of the class of
securities to which this Statement relates.  In connection with the transactions
contemplated by the Merger Agreement, the Reporting Persons had formed a "group"
for the purposes of Rule 13d-3 of the Exchange Act.  This group was dissolved as
of the date of the termination letter from Acquisition and Holdings to Sybron.
At the present time, the Reporting Persons have no specific plans or proposals
that would relate to or result in any of the actions specified in clauses (a)
through (j) of Item 4.  However, the Reporting Persons may consider any such
plans or proposals in the future, if deemed appropriate.  Any further filings
with respect to the subject securities will be filed, to the extent required, by
former members of the dissolved group in their individual capacity.

ITEM 5.   INTERESTS IN SECURITIES OF THE ISSUER

          Item 5 is hereby amended by addition of the following:

          (c) There have been no transactions by any of the Reporting Persons in
the class of securities to which this Statement relates effected since January
19, 1998, the date of the most recent filing on Schedule 13D by the Reporting
Persons.

          (e) Each Reporting Person is the beneficial owner of less than 5% of
class of securities to which this Statement relates as of February 11, 1998
except for 399 Venture, Citibank and Citicorp, who expect to file a separate
Schedule 13D with respect to their holdings and Richard M. Klein who expects to
file a separate Schedule 13D with respect to his holdings.

ITEM 7.   MATERIAL TO BE FILED AS EXHIBITS.

          Item 7 is hereby amended by the addition of the following:

                                     -31-
<PAGE>
 
Exhibit                         Description                                Page

Exhibit 6            Letter dated February 11, 1998 from                    36
                     Acquisition and Holdings to Sybron.

                                     -32-
<PAGE>
 
                                   SIGNATURES

          After reasonable inquiry and to the best of their knowledge and
belief, the undersigned certify that the information set forth in this statement
is true, complete and correct.  In executing this statement, the undersigned
agree, to the extent required by Rule 13d-1(f), that this statement is being
filed on behalf of each of the reporting persons herein.

Dated:  February 24, 1998     399 VENTURE PARTNERS, INC.
                                 
                              By:  /s/ Paul C. Schorr IV
                                 ------------------------
                              Name:  Paul C. Schorr IV
                              Title:  Vice President


                              CITIBANK, N.A.

                              By: /s/ Mary Lynn Putney 
                                 ______________________
                              Name:  Mary Lynn Putney
                              Title:  Managing Director


                              CITICORP

                              By: /s/ Ann M. Goodbody 
                                 ______________________
                              Name:  Ann M. Goodbody
                              Title:  Vice President


                               /s/ Richard M. Klein
                              _________________________
                              Richard M. Klein

                               /s/ John H. Schroeder
                              _________________________
                              John H. Schroeder


                              _________________________
                              Peter de Bruijn

                               /s/ Albert L. Eilender
                              _________________________
                              Albert L. Eilender

                               /s/ Joe J. Belcher
                              _________________________
                              Joe J. Belcher

                                     -33-
<PAGE>
                               /s/ Stephen R. Adler 
                              _________________________
                              Stephen R. Adler

                               /s/ Jose M. Rodriguez
                              _________________________
                              Jose M. Rodriguez

                               /s/ Gerald DeLaney
                              _________________________
                              Gerald DeLaney

                               /s/ Dwight Tamaki
                              _________________________
                              Dwight Tamaki

                               /s/ Robert Login
                              _________________________
                              Robert Login


                              _________________________
                              Aard Vandenberg


                              _________________________
                              Hans Huiskes


                              _________________________
                              Hans Bruggnwirth

                               /s/ Frank Zunino
                              _________________________
                              Frank Zunino


                              SHAWNEE PARTNERSHIP

                              By: /s/ Stuyvesant P. Comfort 
                                 __________________________
                              Name: Stuyvesant P. Comfort
                              Title: Partner

                                     -34-
<PAGE>
 
                              63 BR PARTNERSHIP



                              By: /s/ Stuyvesant P. Comfort 
                                 __________________________
                              Name: Stuyvesant P. Comfort
                              Title: General Partner


                               /s/ James T. Comfort
                              _________________________
                              James T. Comfort

                               /s/ Nathalie C. Urry
                              _________________________
                              Nathalie C. Urry

                               /s/ William T. Comfort, III
                              ____________________________
                              William T. Comfort, III

                               /s/ Stuyvesant P. Comfort
                              __________________________
                              Stuyvesant P. Comfort

                               /s/ Richard M. Cashin
                              _________________________
                              Richard M. Cashin

                               /s/ Michael A. Delaney
                              _________________________
                              Michael A. Delaney

                               /s/ A. Richard Blair
                              _________________________
                              A. Richard Blair

                               /s/ Delores D. Blair
                              _________________________
                              Delores D. Blair

                               /s/ Stephen W. Klein
                              _________________________
                              Stephen W. Klein

                                     -35-

<PAGE>
 
                                   Exhibit 6

                            SYBRON ACQUISITION CORP
                             SYBRON HOLDINGS, INC.



                                                               February 11, 1998


Sybron Chemicals Inc.
P.O. Box 66
Birmingham Road
Birmingham, New Jersey 08011

Attention: Board of Directors



     Re:  Agreement and Plan of Merger
          ----------------------------


Dear Gentlemen:

          Reference is made to that certain Agreement and Plan of Merger dated
as of December 11, 1997 among Sybron Chemicals, Inc., a Delaware corporation
(the "Company"), Sybron Holdings, Inc., a Delaware corporation ("Parent"), and
Sybron Acquisition Corp., a Delaware corporation ("Merger Sub") and wholly owned
subsidiary of Parent, as amended (the "Agreement").  Capitalized terms not
otherwise defined herein shall have the meanings ascribed to them in the
Agreement.

          Parent and Merger Sub have been advised that the Special Committee has
withdrawn its recommendation of the Agreement and the Merger described therein.

          This letter shall serve as notification that, pursuant to Section
8.1(e) of the Agreement, Parent and Merger Sub hereby terminate the Agreement.

          We appreciate the time and energy devoted to this process by the
members of the Special Committee, but we respectfully disagree with the
conclusion they have reached.  The proposed transaction presented an attractive
opportunity for Sybron's public stockholders to receive a premium in cash for
their shares.  We continue to believe that the transaction would have been
supported by a substantial majority of the non-affiliated stockholders.
However, we are not prepared to continue to pursue the transaction without the
support of the Special Committee.  Our shareholders remain committed to their
investment in Sybron and to working to build value for all of the Company's
stockholders.

          At a later date, Parent and Merger Sub will provide the Company with a
statement of the costs and expenses incurred by Parent and Merger Sub in
connection with the Agreement and the transactions contemplated by the
Agreement.  The Company is obligated to reimburse such costs and expenses of
Parent and Merger Sub pursuant to Section 9.12 of the Agreement.
<PAGE>
 
                              Very truly yours,

                              SYBRON ACQUISITION CORP.


                              By: /s/ Richard M. Klein
                                  _____________________________
                                  Name:  Richard M. Klein
                                  Title: President and
                                         Chief Executive Officer



                              SYBRON HOLDINGS, INC.


                              By: /s/ Richard M. Klein
                                  _____________________________
                                  Name:  Richard M. Klein
                                  Title: President and
                                         Chief Executive Officer



cc:  Wolf, Block, Schorr and Solis-Cohen
     Attention: David Gitlin, Esq.

     Dilworth, Paxson LLP
     Attention: Stephen J. Harmelin, Esq.


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