Aqueous epoxy resin-based coating compositions useful for coating metal containers
AssigneeThe Valspar Corporation
InventorsRichard G. Mysliwczyk, William H. McCarty, Arthur T. Spencer
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Abstract
An aqueous coating composition that is particularly suited for coating metal containers used for packaging food and beverages. The coating comprises an aqueous dispersion of the reaction product of a 1,2-epoxy resin with a carboxyl functional addition polymer, an epoxy phosphate ester polymer, and an effective quantity of a curing agent which may be a phenoplast or an aminoplast resin.
Claims14
An aqueous electrocoating composition comprising an aqueous dispersion of:
- (A) the product of the reaction, in the presence of a tertiary amine, of a 1,2-diepoxide resin with a preformed carboxyl functional addition polymer having an acid number of 25-500, the reaction product containing from 10% to 80% by weight of said addition polymer and being free of unreacted 1,2-epoxide groups;
- (B) from 10% to 45% by weight, based on the weight of (A) and (B) combined, of an epoxy phosphate ester polymer that is the reaction product of a 1,2-epoxy resin and phosphoric acid.
An aqueous electrocoating composition comprising an aqueous dispersion of:
- (A) the product of the reaction, in the presence of a tertiary amine, of a 1,2-diepoxide resin having a number average molecular weight of 1600-8500 daltons with a preformed carboxyl-functional addition polymer having an acid number of 150-500, a number average molecular weight of 2000-20,000, and a glass transition temperature of at least 80.degree. C., the reaction product containing from 10% to 80% by weight of said addition polymer and being free of unreacted 1,2-epoxide groups;
- (B) from 10% to 45% by weight, based on the weight of (A) and (B) combined, of an epoxy phosphate ester polymer that is the reaction product of a 1,2-epoxy resin with sufficient phosphoric acid to render the reaction product water dispersible.
An aqueous electrocoating composition comprising an aqueous dispersion of:
- (A) the product of the reaction, in the presence of a tertiary amine, of a 1,2-diepoxide resin having a number average molecular weight of 1600-8500 daltons with a preformed carboxyl-functional addition polymer having an acid number of 50-130, a number average molecular weight of 2000-20,000, and a glass transition temperature less than 60.degree. C., the reaction product containing from 10% to 80% by weight of said addition polymer and being free of unreacted 1,2-epoxide groups;
- (B) from 10% to 45% by weight, based on the weight of (A) and (B) combined, of an epoxy phosphate ester polymer that is the reaction product of a 1,2-epoxy resin with sufficient phosphoric acid to render the reaction product water dispersible.
Dependencies are inferred from the claim text.