Curable coating composition comprising carboxyl containing copolymer, a second copolymer and amine/aldehyde condensate or epoxy resin

Claim 1

A COATING COMPOSITION ADAPTED TO FROM A HARD BUT FLEXIBLE COATING UPON BAKING ON A SUBSTRATE WHICH CONTAINS ESSENTIALLY A MIXTURE SELECTED FROM THE GROUP CONSISTING OF: I. A MIXTURE OF (A) A COPOLYMER RESULTING FROM THE COPOLYMERIZATION OF AT LEAST ONE NEUTRAL MONOETHYLENICALLY UNSATURATED MONOMER HAVING ETHYLENIC UNSATURATION AS THE SOLE REACTIVE GROUP WITH A MONOETHYLENICALLY UNSATURATED MONOMER CONTAINING CARBOXYLIC ACID GROUPS; SAID COPOLYMER BEING BLENDED WITH FROM 5% TO 30% BY WEIGHT OF A COMPATIBLE POLYMERIC RESIN SELECTED FROM THE GROUP CONSISTING OF COPOLYMERS OF ETHYLACRYLATE AND DIMETHYLAMINOETHYL METHACRYLATE, COPOLYMERS OF ETHYL ACRYLATE AND ACRYLAMIDE, COPOLYMERS OF BUTYL ACRYLATE AND ACRYLAMIDE, COPOLYMERS OF METHYL METHACRYLATE AND ACRYLAMIDE, RUBBERY COPOLYMERS OF BUTADIENE, METHYL METHACRYLATE AND DIMETHYLAMINOETHYL METHACRYLATE, AND COPOLYMERS OF STYRENE AND 2-VINYLPYRIDINE AND, (B) A CROSS-LINKING AGENT SELECTED FROM THE GROUP CONSISTING OF AMINE-ALDEHYDE RESINS AND MATERIALS CONTAINING AT LEAST TWO EPOXIDE GROUPS PER MOLECULE; II. A MIXTURE OF (A) A COPOLYMER RESULTING FROM THE COPOLYMERIZATION OF AT LEAST ONE NEUTRAL MONOETHYLENICALLY UNSATURATED MONOMER HAVING ETHYLENIC UNSATURATION AS THE SOLE REACTIVE GROUP WITH ACRYLAMIDE, SAID COPOLYMER BEING BLENDED WITH FROM 5% TO 30% BY WEIGHT OF A COMPATIBLE POLYMERIC RESIN RESULTING FROM THE COPOLYMERIZATION OF ETHYL ACRYLATE WITH ACRYLIC ACID AND, (B) AS CROSS-LINKING AGENT, AN AMINE-ALDEHYDE RESIN; III. A MIXTURE OF (A) A COPOLYMER RESULTING FROM THE COPOLYMERIZATION OF AT LEAST ONE NEUTRAL MONOETHYLENICALLY UNSATURATED MONOMER HAVING ETHYLENIC UNSATURATION AS THE SOLE REACTIVE GROUP WITH A MONOETHYLENICALLY UNSATURATED MONOMER CONTAINING AMIDE GROUPS; AND COPOLYMER HAVING BEEN REACTED WITH AN ALDEHYDE TO FORM N-ALKYLOLATED AMIDE GROUPS, SAID COPOLYMER BEING BLENDED WITH FROM 5% TO 30% BY WEIGHT OF A COMPATIBLE POLYMERIC RESIN RESULTING FROM THE COPOLYMERIZATION OF ETHYL ACRYLATE AND ACRYLIC ACID AND, (B) AS CROSS-LINKING AGENT, AN EPOXIDIZED MATERIAL CONTAINING AT LEAST TWO EPOXIDE GROUPS PER MOLECULE; IV. A MIXTURE OF (A) A COPOLYMER RESULTING FROM THE COPOLYMERIZATION OF AT LEAST ONE NEUTRAL MONOETHYLENICALLY UNSATURATED MONOMER HAVING ETHYLENIC UNSATURATION AS THE SOLE REACTIVE GROUP WITH A MONOETHYLENICALLY UNSATURATED MONOMER CONTAINING CARBOXYLIC ACID GROUPS, SAID CARBOXYLIC ACID GROUPS HAVING BEEN IN PART REACTED WITH AN OLEFINIC OXIDE TO FORM B-HYDROXYALKYL GROUPS, SAID COPOLYMER BEING BLENDED WITH FROM 5% TO 30% BY WEIGHT OF A COMPATIBLE POLYMERIC RESIN RESULTING FROM THE COPOLYMERIZATION OF ETHYL ACRYLATE AND ACRYLAMIDE AND, (B) AS CROSS-LINKING AGENT, AN AMINE-ALDEHYDE RESIN; AND V. A BLEND OF (A) A COPOLYMER RESULTING FROM THE COPOLYMERIZATION OF AT LEAST ONE NEUTRAL MONOETHYLENICALLY UNSATURATED MONOMER HAVING ETHYLENIC UNSATURATION AS THE SOLE REACTIVE GROUP WITH A MONOETHYLENICALLY UNSATURATED MONOMER HAVING AN EPOXIDE GROUP IN THE MOLECULE AND A MONOETHYLENICALLY UNSATURATED MONOMER CONTAINING CARBOXYLIC ACID GROUPS, AND, (B) FROM 5% TO 30% BY WEIGHT OF A COMPATIBLE POLYMERIC RESIN RESULTING FROM THE COPOLYMERIZATION OF ETHYL ACRYLATE AND ACRYLAMIDE.