1 Exhibit 10.31 BANK OF AMERICA AMENDMENT TO DOCUMENTS AMENDMENT NO. 4 TO BUSINESS LOAN AGREEMENT This Amendment No. 4 (the "Amendment") dated as of December 20, 1996 is among Bank of America National Trust and Savings Association (the "Bank") and CALNETICS CORPORATION ("Borrower 1"), MANCHESTER PLASTICS CO., INC. ("Borrower 2"), NY-GLASS PLASTICS, INC. ("Borrower 3") and AGRICULTURAL PRODUCTS, INC. ("Borrower 4") (Borrower 1, Borrower 2, Borrower 3 and Borrower 4 are sometimes referred to collectively as the "Borrowers" and individually as the "Borrowee"). RECITALS A. The Bank and the Borrowers entered into a certain Business Loan Agreement dated as of June 20, 1994, as previously amended (the "Agreement"). B. The Bank and the Borrowers desire to further amend the Agreement. AGREEMENT 1. DEFINITIONS. Capitalized terms used but not defined in this Amendment shall have the meaning given to them in the Agreement. 2. AMENDMENTS. The Agreement is hereby amended as follows: 2.1 Subparagraph (a) of Paragraph 1.3 of the Agreement is amended to read in its entirety as follows: "(a) The interest rate is the Bank's Reference Rate plus one-quarter (.25) of a percentage point." 2.2 In Paragraph IA.2 of the Agreement, the date "DECEMBER 31, 1997" is substituted for the date "DECEMBER 30, 1996". 2.3 The first paragraph in Paragraph 4.7 of the Agreement is amended to read in its entirety as follows: 4.7 INTEREST ON LATE PAYMENTS. At the Bank's sole option in each instance, any amount not paid when due under this Agreement (including interest) shall bear interest from the due date at the Bank's Reference Rate plus one- quarter (.25) of a percentage point." 2.4 The first paragraph in Paragraph 7.4 of the Agreement is amended to read in its entirety as follows: "7.4 TANGIBLE NET WORTH. To maintain on a consolidated basis, tangible net worth equal to at least Six Million Dollars ($6,000,000)." 2.5 The first paragraph in Paragraph 7.5 of the Agreement is amended to read in its entirety as follows: "7.5 TOTAL LIABILITIES TO TANGIBLE NET WORTH. To maintain on a consolidated basis, a ratio of total liabilities to tangible net worth not exceeding 1.50:1.00. This ratio will be calculated on the last day of each fiscal quarter of the Borrowers." 3. CONDITIONS. This Amendment will not be effective until the Bank has received the following: Page 19 of 44 2 (a) A copy of this Amendment, duly executed by each Borrower; and (b) A written consent to the terms of this Amendment, duly executed by Union Bank of California, N.A. successor to The Bank of California, N.A. 4. EFFECT OF AMENDMENT. Except as provided in this Amendment, all of the terms and conditions of the Agreement shall remain in full force and effect. This Amendment is executed as of the date stated at the beginning of this Amendment. BANK OF AMERICA NATIONAL TRUST AND SAVINGS ASSOCIATION CALNETICS CORPORATION /s/ Susan C. Howard /s/ Steven L. Strawn ---------------------------------- ---------------------------------- By: Susan C. Howard, Assistant By: Steven L Strawn, Vice President Vice President /s/ Thomas W. Vent /s/ Clinton G. Gerlach ---------------------------------- ---------------------------------- By: Thomas W. Vent, Vice President By: Clinton G. Gerlach, Chairman of the Board and President MANCHESTER PLASTICS CO., INC. /s/ Steven L. Strawn ---------------------------------- By: Steven L. Strawn, President /s/ Clinton G. Gerlach ---------------------------------- By: Clinton G. Gerlach, Chairman of the Board NY-GLASS PLASTICS, INC. /s/ Michael A. Hornak ----------------------------------- By: Michael A. Hornak, President /s/ Clinton G. Gerlach ----------------------------------- By: Clinton G. Gerlach, Chairman of the Board AGRICULTURAL PRODUCTS, INC. /s/ Lon Schultz ----------------------------------- By: Lon Schultz, President /s/ Clinton G. Gerlach ----------------------------------- By: Clinton G. Gerlach, Chairman of the Board Page 20 of 44