Claims
- 1. A method of preparing a coating composition comprising
- a) reacting from about 10% to about 50% of the 1,2- epoxy groups of a 1,2-epoxy resin with an ethylenically unsaturated, epoxy-reactive monomer under conditions providing a modified epoxy resin having unsaturated sites for subsequent copolymerization;
- b) reacting the remaining 1,2-epoxy groups of the modified epoxy resin with a preformed carboxyl functional addition polymer and tertiary amine; and
- c) in an aqueous dispersion of the resulting reaction product, copolymerizing the ethylenically unsaturated groups resulting from Step (a) with an ethylenically unsaturated monomer.
- 2. The method of claim 1 wherein the ethylenically unsaturated monomer of Step (c) comprises at least 35% by weight of the polymer solids of the coating composition.
- 3. The method of claim 1 in which the amounts of modified 1,2-epoxy resin, preformed carboxyl- containing addition polymer and ethylenically unsaturated monomer are chosen such that the epoxy resin-derived portion of the resulting composition ranges from about 5% to about 50% by weight, the portion of the polymer solids derived from the preformed carboxyl functional additional polymer ranges from about 12% to about 35% by weight, and the portion of the resin solids derived from the addition polymerizable monomer comprises about 35% to about 80% by weight.
- 4. A coating composition prepared by a method comprising:
- (a) reacting from about 10% to about 50% of the 1,2-epoxy groups of a 1,2-epoxy resin with an ethylenically unsaturated, epoxy-reactive monomer to provide a modified epoxy resin having unsaturated sites for subsequent copolymerization;
- (b) reacting the remaining 1,2-epoxy groups of the modified epoxy resin with a preformed carboxyl-functional addition polymer and tertiary amine; and
- (c) in an aqueous dispersion of the resulting reaction product, copolymerizing the ethylenically unsaturated groups resulting from step (a) with an ethylenically unsaturated monomer.
- 5. The product of claim 4 wherein at least about 35% by weight of the polymer solids of the coating composition is derived from the ethylenically unsaturated monomer of step (c).
- 6. The coating composition of claim 4 in which the amounts by weight of modified 1,2-epoxy resin, preformed carboxyl-containing addition polymer and ethylenically unsaturated monomer are chosen such that the epoxy resin-derived portion of the resulting composition ranges from about 5% to about 50% by weight, the portion of the polymer solids derived from the preformed carboxyl functional additional polymer ranges from about 12% to about 35% by weight, and the portion of the resin solids derived from the addition polymerizable monomer comprises about 35% to about 85% by weight.
- 7. The coating composition of claim 4 including a free addition polymer formed associatively with the copolymerization of step (c).
- 8. The coating composition of claim 4 wherein the unsaturated, epoxy-reactive monomer of step (a) is a carboxyl-functional or amine-functional monomer.
- 9. The coating composition of claim 8 wherein the unsaturated, epoxy-reactive monomer is acrylic acid or methacrylic acid.
- 10. The coating composition of claim 8 wherein the unsaturated, epoxy-reactive monomer is a secondary or tertiary amine.
- 11. The coating composition of claim 8 wherein the unsaturated, epoxy-reactive monomer is an amino (meth)acrylate.
- 12. The coating composition of claim 4 wherein the ethylenically unsaturated monomer of step (c) comprises styrene.
Parent Case Info
This application is a continuation of U.S. Ser. No. 840,620 filed Feb. 20, 1992, now abandoned, which is a continuation of Ser. No. 741,217 filed Aug. 2, 1991, abandoned which is a continuation of Ser. No. 636,547 filed Jan. 4, 1991, abandoned, which is a continuation of Ser. No. 567,683 filed Aug. 14, 1990, abandoned, which is a continuation of Ser. No. 471,017 filed Jan. 22, 1990, abandoned, which is a continuation of Ser. No. 84,915 filed Aug. 13, 1987, abandoned.
US Referenced Citations (13)
Continuations (6)
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Number |
Date |
Country |
Parent |
840620 |
Feb 1992 |
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Parent |
741217 |
Aug 1991 |
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Parent |
636547 |
Jan 1991 |
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Parent |
567683 |
Aug 1990 |
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Parent |
471017 |
Jan 1990 |
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Parent |
84915 |
Aug 1987 |
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