Cationic, cross-linkable acrylic-polyester resin binder systems

Claim 1

A cross-linkable polyester resin composition comprising a cross-linkable copolymer resin prepared from a monomer system which comprises: (a) 30-80 percent by weight of a non-functional alpha,beta-ethylenically unsaturated main monomer selected from the group consisting of styrene, alkyl styrene, lower alkyl acrylates, methacrylates, vinyl ethers, vinyl acetates and substituted vinyl derivatives; (b) 0.1 to 15 percent by weight of an alpha,beta-ethylenically unsaturated monomer containing carboxyl groups; (c) up to 15 percent by weight acrylamide and N-alkyl substituted acrylamides; (d) 1 to 15 percent by weight of an N-alkoxyalkylamido group containing alpha,beta-ethylenically unsaturated monomer; and (e) up to 12 percent by weight of a cross-linkable epoxy resin modifier having reactive ##STR2## and (f) 1-15 percent by weight of an alpha,beta-ethylenically unsaturated monomer having the following general formula: CH.sub.2 =CR--Z--Y--NR'.sub.3 X wherein R is H or --CH 3 ; Z is --CO 2 ,--CONH--; Y is an alkylene radical having 2-4 carbon atoms; R' is a monovalent alkyl group the three of which may be the same or different; and X is an anion; said alkyl group in said above described compounds being hydrocarbon radicals having 1-4 carbon atoms, and said cross-linkable polyester is a polyesterification product of an unsaturated dicarboxylic acid and a polyhydric alcohol and which is substantially cross-linked with said copolymer.