Document:

<PAGE>

                                                                   Exhibit 10(i)

                                                                  EXECUTION COPY

                        SUPPLEMENTAL EMPLOYMENT AGREEMENT

      This Supplemental Employment Agreement ("Supplemental Agreement"), made
this ________ day of September, 2001, between Church & Dwight Co., Inc., a
Delaware corporation (hereinafter "Employer"), having a principal place of
business at 469 North Harrison Street, Princeton, New Jersey 08543, and Jon L.
Finley (hereinafter the "Employee").

                                   WITNESSETH:

      WHEREAS, Employee was employed by Employer from April 1, 2001 to July 15,
2001; and

      WHEREAS, Employer and Employee entered into an Employment Agreement dated
as of April 1, 2001 (the "Employment Agreement"), which provides for, among
others, the terms and conditions applicable upon Employee's resignation from the
Employer, and

      WHEREAS, Employee tendered his resignation from his position with
Employer, as President and Chief Operating Officer, effective on July 15, 2001,
and

      WHEREAS, Employer has accepted such resignation, and

      WHEREAS, Employer and Employee are desirous of clarifying and
supplementing the terms and conditions of the Employment Agreement relating to
Employee's resignation from Employer, by entering into this Supplemental
Agreement.

      NOW, THEREFORE, in consideration of the mutual agreements and commitments
contained herein, the parties hereby agree as follows:
<PAGE>

      1. Employee's resignation from service with the Employer is effective on
July 15, 2001, (the "Resignation Date"). Consideration to be paid to Employee
shall be the same as that enumerated in the section of the Employment Agreement
designated as "Resignation for Good Reason within six-months", including the
following terms. Commencing on the Resignation Date and for a period of nineteen
(19) months thereafter, (July 16, 2001 through February 15, 2003) Employer
agrees to continue Employee's base salary (to be paid in accordance with
Employer's regular payroll) computed at Employee's current annual salary rate of
$350,000 per year, as consideration for and, together with all additional
consideration provided for herein and in the Employment Agreement, in full
settlement of any and all claims which Employee may have against Employer now or
in the future arising from Employee's employment relationship with Employer,
including, but not limited to, the terms and conditions of this Supplemental
Agreement or the Employment Agreement. In addition, and provided that Employee
does not obtain similar coverage from another source, during this nineteen-month
period of time, and for an additional period of five (5) months (February 15,
2003 through July 15, 2003), Employee will continue to be covered by Employer's
medical, dental and life insurance employee benefit plans, ("Employee Benefit
Plan Coverage"), which in no event will provide lesser coverage or higher
contributions than on the date of resignation, except that Employee will be
subject to changes made to such benefit plans which changes apply generally to
all Plan participants. Except as provided herein, or in the Employment
Agreement, participation by Employee in all other Employer benefit plans shall
terminate on the Resignation Date. Employee shall also be eligible for
continuation of health care coverage, if available, as provided in the
Consolidated Omnibus Reconciliation Act of 1985 ("COBRA"). In addition to all
other compensation provided for in this Paragraph 1, Employee shall receive
distribution of all vested accounts Employee has in Employer's savings plan,
profit sharing

                                       2
<PAGE>

plan and deferred compensation plan, as provided for pursuant to each respective
plan, and/or in the Employment Agreement. Such distribution will be made in the
normal course of administration of such plans. Attached to this Agreement as
Exhibit A is a letter addressed to Employee from Employer's Human Resource
Department indicating the specific amounts vested in each respective plan.

      2. The parties acknowledge that any matching contributions earned by
Employee as a result of his contributions to Employer's savings plan would not
be vested, pursuant to the terms of that plan, and, therefore, could not be
distributed to Employee. Employer hereby agrees to pay to Employee, as soon as
practicable following execution of this Supplemental Agreement, an amount equal
to the value of the 86.807 shares of Employer's stock credited to Employee's
account on the date of distribution, less applicable payroll withholdings, as
additional compensation in lieu of such Employer match. The value of such shares
as of August 27, 2001 was $2,288.23.

      3. Notwithstanding the provisions of Employer's 1998 Stock Option Plan
("Plan"), the stock option award granted to Employee on April 1, 2001, with
rights to purchase 100,000 shares of Employer's stock, at a purchase price of
$22.715 per share, is 100% vested as of July 15, 2001. Employee agrees to
exercise such options at the earlier to occur of July 15, 2004 or the date at
which the then current market price for Employer's stock is $10 greater than the
option price for 20 consecutive trading days. Any options not so exercised will
be forfeited. All other stock options granted to Employee are hereby forfeited.

                                       3
<PAGE>

      4. The parties acknowledge that Employee is entitled to an incentive
compensation award for 2001 in the gross amount of $350,000. Such amount, less
applicable tax withholdings, shall be paid to Employee in a manner consistent
with Employer's Incentive Compensation Program, but in no event later than
February 15, 2002.

      5. Employer agrees to pay to Employee certain unpaid relocation expenses
incurred by Employee in connection with his commencement of employment. Employer
further agrees to provide Employee a gross-up payment with respect to any
non-tax-deductible relocation payment made to Employee, and included in
Employee's income. The gross-up payment shall be an amount sufficient to enable
Employee to have an adequate amount of after-tax dollars to pay his income taxes
on the non-tax-deductible relocation payments (the "Gross-up"). The total amount
to be paid, exclusive of any Gross-Up, is $9,839.77 as follows:

<TABLE>
<S>                                                                      <C>
         Minnesota House Payments - Interest

                       5/1/01 - 6/28/01                                  $2,835.54

         Minnesota House Payments - Property Tax

                       5/1/01 - 6/28/01                                  $2,004.23

         Miscellaneous Expense Allowance                                 $5,000.00
                                                                         ---------
                                                                         $9,839.77
</TABLE>

      Employee agrees to accept this payment in full settlement of all claims
relating to relocation costs in connection with Employee's commencement of
employment. Said amount shall be paid to Employee as soon as practicable
following execution of this Supplemental Agreement.

                                       4
<PAGE>

      6. Employer agrees to reimburse Employee for certain expenses incurred by
Employee in connection with his possible relocation from Princeton, New Jersey
to a new location of Employee's choice anywhere in the continental United
States, provided that such relocation occurs by July 15, 2002, and, further
provided, that Employee is not otherwise reimbursed for such expenses by a third
party. Such relocation reimbursements shall be subject to the Gross-up procedure
described in Section 5 above. Expenses subject to reimbursement are:

            (i)   actual cost of physical relocation of Employee, his family and
                  his personal possessions.

            (ii)  real estate commission on sale of Princeton residence.

            (iii) any other reasonable and customary real estate expenses in
                  connection with the sale of Employee's Princeton residence.

      7. In exchange for the consideration described above, and for other good
and valuable consideration, Employee:

            a. hereby releases and forever discharges Employer, its officers,
            directors, employees, successors, and assigns of and from any and
            all actions or causes of action, suits, claims, charges or
            complaints which Employee may have against Employer, for all claims,
            including but not limited to, claims alleging discrimination under
            the Age Discrimination in Employment Act (ADEA), as amended, or
            unfair employment practices of any type arising from Employee's
            employment with or resignation from Employer. The Employee does not
            waive

                                       5
<PAGE>

            any rights or claims that may arise after the effective date of this
            Supplemental Agreement. Moreover, Employee affirms that he will not
            cause, nor permit to be filed on his behalf, any charge, complaint
            or action before any court or administrative agency alleging
            discrimination or any unfair employment practice except that
            Employee may bring a claim under the ADEA to challenge this
            Supplemental Agreement; and

            b. agrees not to engage, directly or indirectly, for a period of
            nineteen months from the Resignation Date (July 16, 2001 through
            February 15, 2003), in any business activity, including but not
            limited to, participation as an employee, agent, consultant, owner,
            principal, investor, or the like, where such business activity
            competes directly or indirectly with the manufacture, marketing or
            sale of Employer's products. Notwithstanding anything to the
            contrary contained elsewhere in this paragraph or in this
            Supplemental Agreement, Employee may become affiliated with any
            organization he chooses including those organizations which contain
            Business Units which compete directly or indirectly with the
            manufacturing, marketing or sale of Employer's products; provided,
            however, that Employee shall not be affiliated in any manner, as
            described above, with such competing Business Unit. For purposes of
            this Section 7(b), "Business Unit(s)" shall be defined as any
            business group, department, division or the like, engaged in the
            manufacturing, marketing or sale of laundry products, toothpastes or
            dentifrices, mouthwash, or oral care gums.

            c. Notwithstanding the provisions of Section 7(b) above, should
            Employee engage directly or indirectly in a competing activity
            otherwise prohibited by the

                                       6
<PAGE>

            provisions of Section 7(b), then, in that event, Employer's
            obligation to provide continuation of Employee's base salary and
            medical, dental and life insurance benefits, as provided in Section
            1 above, shall cease effective as of the date of commencement of
            such activity. Any base salary paid to Employee for periods prior to
            such effective date shall be retained by Employee. Any base salary
            paid to Employee for periods following such effective date shall be
            returned to Employer by Employee immediately after such effective
            date.

      8. Employee hereby resigns his position as a member of Employer's Board of
Directors, effective on the Resignation Date.

      9. The parties acknowledge that Employee has returned to Employer any
property of Employer that was in the possession of Employee.

      10. Both parties agree to hold confidential and not disclose to any third
party, except Employee's immediate family, and legal, accounting and financial
advisors, the terms of this Supplemental Agreement, or the Employment Agreement.

      11. The parties mutually agree that each will not deprecate, disparage or
otherwise comment adversely upon the other to any person or entity; provided,
however, that this provision shall not prohibit either party from responding to
questions asked of him or a representative of Employer at a deposition, trial or
other legal or administrative proceedings; and, further provided, that should
either party be called upon to participate in any such activity, the party so
called upon will give the other party as much advance notice of such
participation

                                       7
<PAGE>

as is reasonable under the circumstances, to enable such other party to take any
legally permissible action such other party may deem appropriate to seek to
enjoin such participation. Employer and Employee have reached agreement on a
statement of reference to be provided in response to third party inquiries
regarding Employee's tenure with Employer. Such statement is attached hereto as
Exhibit B. Employer further agrees that all such third party inquiries shall be
referred to Employer's Vice President Human Resources for response. Employer
further agrees to instruct its appropriate employees regarding the proper
handling of such third party inquiries.

      12. Employee shall have no less than twenty-one (21) days to consider this
Supplemental Agreement before execution. This Supplemental Agreement may be
revoked by Employee at any time up to seven (7) days immediately following the
execution of this Supplemental Agreement by both parties by delivering written
notification of such revocation to Employer's General Counsel. This Supplemental
Agreement shall not become effective or enforceable until such revocation period
has expired.

      13. Employee represents and warrants that, during the course of his
employment with Employer, he conducted himself in a manner consistent with the
"Guidelines for Personal Business Conduct", as disseminated to employees from
time to time, and that all acts he performed were within the scope of his
employment with Employer.

      14. This written agreement, together with the Employment Agreement,
contain the entire agreement with respect to the subject matter of this
Supplemental Agreement between the parties, provided, however, that if there is
any conflict between the provisions of this

                                       8
<PAGE>

Supplemental Agreement and the Employment Agreement, then, in that event, the
provisions of this Supplemental Agreement shall control. The parties acknowledge
and agree that neither of them has made any representation with respect to the
subject matter of this Supplemental Agreement or any representations inducing
the execution and delivery hereof, except such representations as are
specifically set forth herein and each of the parties hereto acknowledge that he
or it has relied on his or its own judgment in entering into same. The parties
hereto further acknowledge that any statements or representations that may have
been made heretofore by either of them to the other are void and of no effect
and that neither of them has relied thereon in connection with his or its
dealings with the other. Employee is advised to seek the advice of legal counsel
prior to entering into this Supplemental Agreement, and acknowledges that
Employer has afforded him ample time and opportunity to do so, at his own
expense.

      15. The parties mutually agree that if there is a material breach or
intended material breach by either party to this Supplemental Agreement, the
Employment Agreement, or of the Confidential Information and Inventions
Agreement dated April 1, 2001 (Exhibit C attached hereto and made a part
hereof), the non-breaching party's remedies at law will be inadequate and said
party shall be entitled to seek redress by court proceedings in the form of an
injunction restraining the breaching party and/or providing for specific
performance without any bond or other security being required. Nothing herein
shall be construed as preventing the non-breaching party from pursuing, or
seeking any damages at law or in equity which it may have, and the non-breaching
party shall, in any event, be entitled upon any such material breach to
terminate this Supplemental Agreement, or the Employment Agreement.

                                       9
<PAGE>

      16. The parties hereby agree that Employee shall be entitled to avail
himself of the indemnity protections afforded officers of Employer as provided
in Article IX of Employer's By-Laws, a copy of which is attached hereto as
Exhibit D and incorporated herein.

      17. All disputes relating to employment of Employee, including disputes
relating to the Employment Agreement or this Supplemental Agreement, shall be
resolved through arbitration and in accordance with the rules of the American
Arbitration Association for employment disputes except as modified herein.
Notice of demand for arbitration shall be filed in writing with the other party
and the American Arbitration Association. The arbitration decision shall be
binding and conclusive provided that the decision is consistent with the laws of
the State of New Jersey and the factual decision(s) is not against the weight of
the evidence. Both parties shall have a right to appeal the arbitrator's
decision in accordance with the aforesaid standard. The award rendered by the
arbitrator shall be final, and judgment may be entered upon it in accordance
with the applicable law in New Jersey and as limited by the right of appeal
described herein.

      If either party should require relief in the form of a temporary
restraining order, a preliminary injunction or other emergency order, the party
may proceed directly to court without the need to seek relief by way of
arbitration initially.

      18. The parties hereto agree that it is their intention that this
agreement is to be construed in accordance with the laws of the State of New
Jersey, and agree to submit any formal court proceeding to the applicable court
of the State of New Jersey.

                                       10
<PAGE>

      19. This Agreement shall be binding on and inure to the benefit of the
respective parties hereto, their successors and assigns.

      IN WITNESS WHEREOF, the parties hereto have hereunto set their hands and
seals the date and year first above written. CHURCH & DWIGHT CO., INC.

                                  /s/ Steven P. Cugine                   10/5/01
                                  ----------------------------------------------
                                  Steven P. Cugine                          Date
                                  Vice President Human Resources

                                  /s/ Jon L. Finley                      10/3/01
                                  ----------------------------------------------
                                  Jon L. Finley                             Date

                                       11<PAGE>

                                                                   Exhibit 10(j)

January 3, 2002

Joseph A. Sipia, Jr.
1620 Thistlewood Drive
Washington Crossing, PA 18977

Dear Joe:

The executive management team is excited about the prospect of you joining the
company. We are just as enthused about your long-term future with Church &
Dwight Co., Inc. This letter will confirm our offer for the position of
President and Chief Operating Officer, Specialty Products Division; reporting
directly to Robert Davies, Chief Executive Officer.

We are offering an attractive package of both direct and indirect benefits. Some
of the major highlights of our employment offer are detailed below:

o     Your starting base salary will be $10,416.67 semi-monthly ($250,000
      annually).

o     You will participate in the Church & Dwight Incentive Compensation program
      that pays out a target of 55% of base salary with a range of 0 to 200% of
      target depending on performance.

o     You will be enrolled in the company's Stock Option plan. Options are
      annually distributed in the May time-frame. You will receive stock options
      equal in number to those received by other employees at your level. Your
      two grants, which you will receive shortly after your first day of
      employment, will be for 17,300 and 7,700 options and you will have an
      exercise price equal to the average of the high and low on your start date
      (details surrounding these grants are outlined in the attached term
      sheets.).

o     Vacation Entitlement -You will receive 20 vacation days and 2 personal
      days in 2002.

o     You will participate in Church & Dwight's comprehensive health, welfare
      and retirement programs. In order to help offset the reduction in your
      existing retirement plan, we are prepared to offer the following:

      -     An additional 10% of cash compensation to the annual profit sharing
            program
      -     Increase your stock option base multiple from 1.8 to 2.1, which at
            today's price would equal an additional 2,900 stock options

<PAGE>

                                                            Joseph A. Sipia, Jr.
                                                                 January 3, 2002
                                                                     Page 2 of 2

o     Your anticipated start date will be February 1, 2002.

Kathy McAleer of the Human Resources Department will be contacting you to
schedule a full benefits orientation shortly after your start date. In the
interim, the attached "Summary of Benefits" should provide a helpful outline of
our benefits programs. Your benefits become active on the first day of the month
following 30 days of active employment.

This offer is contingent upon the satisfactory completion of a drug screening,
as well as verification of your eligibility to work in the United States (I-9).
Call Martin Hayes (609-279-7313) to setup an appointment for your drug
screening. Please do not hesitate to contact me with regard to the specifics of
this offer and/or related benefit programs.

Sincerely,

/s/Steven P. Cugine

Steven P. Cugine
Vice President, Human Resources

Accepted by: /s/ Joseph A. Sipia, Jr.     1/8/02
             -----------------------------------
             Joseph A. Sipia, Jr            Date

Enclosures

<PAGE>

                            Church & Dwight Co., Inc.

--------------------------------------------------------------------------------

                    Employment Terms for Joseph A. Sipia, Jr.

<TABLE>
<CAPTION>
                                                                  Agreement
                           ----------------------------------------------------------------------------------------
<S>                        <C>
Position                   o        President & Chief Operating Officer, Specialty Products Division

Salary                     o        At commencement of employment base salary of $250,000 per annum

Annual Incentive           o        Minimum:              0% of salary
                           o        Target:              55% of salary
                           o        Maximum:            110% of salary

Long-term Incentives       o        An initial grant of 17,300 Church & Dwight Co., Inc. stock options at fair
                                    market value on grant date, vesting in their entirety upon conclusion of three
                                    years, and exercisable over a ten-year term
                           o        Ongoing option grant amount will be determined based on the existing Long-term
                                    Incentive Plan; eligible to participate in May 2002 option grant

Benefits, etc.             o        Participation in all company plans and programs (see plan documents-attached)
                           o        Additional benefits
                                    -     An additional 10% of cash compensation (base and bonus) paid in cash to
                                          the annual profit sharing program
                                    -     Increase your stock option multiple of base salary from 1.8x to 2.1x at
                                          face value ("Incremental Grant"), which, at CHD's current market price
                                          would equal approximately 2,900 additional stock options
                                    -     At age 61, Incremental Grant eliminated and the profit sharing premium is
                                          reduced to 7% at age 62, 4% at age 63 and to 0% at age 64 and beyond
                                    -     A special grant of 7,700 CHD stock options ("Special Grant") at fair
                                          market value on grant date
                                    -     Incremental Grant and Special Grant to be granted with vesting and
                                          exercise rights for up to three years post-retirement or termination by
                                          the Company without Cause or by Executive for Good Reason. Grant
                                          agreements and applicable plans govern all other options held by
                                          Executive

Termination without        o        Employment is at will
"Cause" by C&D, or for     o        Base salary to date of termination
"Good Reason" by           o        Base salary and annual incentive (at target)
Executive                           Payable monthly pursuant to following schedule ("payment Continuation Period"):
                                    -     1st 12 months = 3x base and target annual incentive
                                    -     2nd 12 months = 2.5x base and target annual incentive
                                    -     3rd 12 months = 2x base and target annual incentive
                                    -     4th 12 months = 1.5x base and target annual incentive
                                    -     5th and ongoing = 1x base and target annual incentive
                           o        Payout subject to 50% mitigation (dollar-for-dollar) for any income received by
                                    Executive during Payment Continuation Period
</TABLE>

<PAGE>

                            Church & Dwight Co., Inc.

--------------------------------------------------------------------------------

                    Employment Terms for Joseph A. Sipia, Jr.

<TABLE>
<S>                        <C>
                           o        Settlement of deferred compensation arrangements
                           o        Continued health and life insurance for 12 months (or the Company will, at its
                                    option, pay the after-tax cost of securing similar benefits), subject to full
                                    offset upon Executive receiving benefits coverage from subsequent employer
                           o        Long-term Incentive options are governed by individual grant agreements and
                                    applicable plans, to the extent not provided for herein
                           o        Immediate vesting of benefits (including Company contributions) in Profit
                                    Sharing and Saving Plans
                           o        Ability to continue vesting and exercise Incremental Grant and Special Grant
                                    for up to three years (designed to help offset the decline in pension benefits
                                    payable from prior employer)

Termination                o        Base salary to date of death
Due to Death               o        Pro rata annual incentive for year of termination at target
                           o        All options held by Executive will continue to vest and remain exercisable for
                                    up to three years by Executive's designated heirs or estate (but no longer than
                                    the remaining term)
                           o        Settlement of deferred compensation arrangements
                           o        Immediate vesting of benefits (including Company contributions) in Profit
                                    Sharing and Savings Plans
Termination Due to         o        Base salary through date of Disability
Disability                 o        Pro rata annual incentive for year of termination at target
                           o        Retains employee status regarding benefits and deferral until earlier of age 65
                                    or receipt of Deferred Compensation or Profit Sharing (see plan documents)
                           o        If recovers from Disability and not offered previous positions, treated as
                                    termination without "Cause"
                           o        If offered previous position and refuses without Good Reason, treated as "Quit"
                           o        Incremental Grant and Special Grant continue to vest and remain exercisable for
                                    up to three years (but no longer than remaining term); other options continue
                                    to vest and be exercised pursuant to the grant agreement and applicable plan

Termination for Cause      o        Base salary through date of termination
                           o        Settlement of deferred compensation arrangements
                           o        Vested options exercisable for 30 days
                           o        Forfeiture of unexercised options and other outstanding awards

Quit without Good Reason   o        Treated the same as a termination for "Cause"

Executive's Obligations    o        Unlimited non-disclosure of "confidential information", employment terms and
                                    employee information
                           o        Non-compete as specified for 24 months if terminated without "Cause", may be
                                    waived by Company upon written request by Executive and not unreasonably
                                    withheld by Company
                           o        Non-compete as specified for 24 months if terminated for "Cause"
                           o        Non-solicitation of CHD employees for 24 months
                           o        Non-disparagement (mutual)
</TABLE>

                                       -2-
<PAGE>

                            Church & Dwight Co., Inc.

--------------------------------------------------------------------------------

                    Employment Terms for Joseph A. Sipia, Jr.

<TABLE>
<S>                        <C>
                           o        All company materials must be returned prior to final day of employment
                           o        Injunctive relief in addition to other available remedies at law

Dispute Resolution         o        Mandatory arbitration
                           o        New Jersey courts/laws
                           o        Your legal costs reimbursed unless action determined to be in bad faith or frivolous

Indemnification            o        As provided in the Company's by-laws
                                    -     D&O coverage and total indemnification provided in by-laws for Officers
                                          and Directors

Other                      o        Executive to execute written release in form and substance satisfactory to the
                                    Company in exchange for all severance payments
</TABLE>

<TABLE>
<CAPTION>
                                                                    Definitions
                           ----------------------------------------------------------------------------------------------
<S>                        <C>
Good Reason                o        Decrease in base salary or target annual incentive below 55%
                           o        Any required relocation more than 35 miles from CHD headquarters (or then
                                    current work location)
                           o        After a change in control has occurred, any demotion in title
                           o        Material breach of this agreement by Company after receipt of written notice
                                    from Executive and which remains uncured for 15-day period o Executive must act
                                    within 60 days of event giving rise to Good Reason

Change in Control          o        Any person, group or entity acquires 50% or more of CHD's issued and
                                    outstanding voting equity
                           o        Director composition change of 50% or more over any 24-month period (unapproved
                                    by 2/3's of "Incumbent Directors")
                           o        Merger, consolidation, sale of all or substantially all assets or other
                                    transaction approved by shareholders unless 50% or more continuing ownership
                           o        Sale or spin-off of the Specialty Products Division from Church & Dwight Co.,
                                    Inc.
                           o        The terms of employment specified herein shall survive a Change in Control.

Cause                      o        Termination due to Executive's dishonesty, fraud, willful misconduct, or
                                    failure to substantially perform services (for any reason other than illness or
                                    incapacity) or breach of Executive's fiduciary responsibilities to the Company

Competition                o        Any business within a company or corporation which sells any product that
                                    competes with the products sold by the Company or any subsidiary or division
                                    thereof and for which Executive would perform substantially similar employment
                                    functions to those performed at CHD

Confidential Information   o        All information concerning the business of CHD or any subsidiary or division
                                    thereof relating to any of their products, product development, trade secrets,
                                    customers, suppliers, finances, and business plans and strategies other than
                                    information which properly becomes part of the public domain
</TABLE>

                                       -3-

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