Reaction products of polyepoxides with styrene-acrylic acid-vinyl pyridine copolymers

Claim 1

A COATING COMPOSITION ADAPTED FOR BEING HARDEND INTO AN INFUSIBLE, SOLVENT INSOLUBLE, GREASE-RESISTANT FILM ON BAKING AT A TEMPERATURE OF FROM 100* TO 150* C. AFTER APPLICATION, COMPRISING ESSENTIALLY A LINEAR THERMOPLASTIC COPOLYMER OF FROM 0.05 TO 1.0 PART OF VINYL PYRIDINE AND 100 PARTS OF A MIXTURE COMPRISING MORE THAN 50 PARTS OF STYRENE AND AT LEAST 5 PARTS OF AN ACID SELECTED FROM THE GROUP CONSISTING OF ACRYLIC ACID AND METHACRYLIC ACID AND AT LEAST 15 PARTS OF A LOWER ALKYL ESTER OF ACRYLIC ACID, IN ADMIXTURE WITH A POLYEPOXIDE SELECTED FROM THE GROUP CONSISTING OF DIPENYLOLPROPANE DIGLYCIDYL ETHER AND LOW MOLECULAR WEIGHT POLYMERIC CONDENSATION PRODUCTS OF DIPHENYLOLPROPANE WITH EPICHLOROHYDRIN, SAID CONDENSATION PRODUCTS HAVING AN EPOXIDE CONTENT OF AT LEAST 7.5% BY WEIGHT AND A MELTING POINT NOT EXCEEDING 75* C. AND A GARDNER VIS COSITY NOT EXCEEDING 1.65 POISES AS 40% SOLUTIONS IN ETHYLENE GLYCOL MONOBUTYL ETHER, THE PROPORTION OF POLYEPOXIDE TO COPOLYMER BEING SUCH THAT ONE EPOXIDE GROUP IS PRESENT FOR EACH FREE CARBOXYLIC ACID GROUP OF THE COPOLYMER.