Coating composition comprising an organic solvent solution of vinyl chloride-vinylidene chloride copolymer and an alkyl acrylate-alkyl methacrylate copolymer and base coated therewith

Claim 1

A COATING COMPOSITION COMPRISING A COMPATIBLE ORGANIC SOLVENT SOLUTION OF A COPOLYMER OF VINYL CHLORIDE AND VINYLIDENE CHLORIDE AND A COPOLYMER OF A MINOR WEIGHT PROPORTION OF LOWER ALKYL ACRYLATE ESTER, IN WHICH THE ALKYL GROUP CONTAINS FROM 1 TO 2 CARBON ATOMS, WITH A MAJOR WEIGHT PROPORTION OF A LOWER ALKYL METHACRYLATE ESTER, IN WHICH THE ALKYL GROUP CONTAINS FROM 1 TO 4 CARBON ATOMS, DISSOLVED IN A SOLVENT MEDIUM COMPRISING AT LEAST 75% BY WEIGHT OF LIQUID AROMATIC HYDROCARBON SOLVENT, SAID COPOLYMER OF VINYL CHLORIDE AND VINYLIDENE CHLORIDE CONTAINING FROM ABOUT 30% TO ABOUT 75% BY WEIGHT OF VINYL CHLORIDE WITH THE BALANCE OF THE COPOLYMER BEING VINYLIDENE CHLORIDE AND HAVING A SPECIFIC VISCOSITY OF ABOUT 0.12 TO ABOUT 0.30 MEASURED IN A 0.4% SOLUTION OF THE COPOLYMER IN NITROBENZENE AND BEING SUBSTANTIALLY FREE OF HOMOPOLYMERS OF VINYL CHLORIDE AND VINYLIDENE CHLORIDE AND OF COPOLYMERS THEREOF OUTSIDE OF THE STATED RANGE OF PROPORTIONS AND THEREBY BEING COMPLETELY SOLUBLE IN A 25% BY WEIGHT SOLUTION THEREOF IN TOLUENE, SAID COPOLYMER OF ACRYLATE ESTER AND METHACRYLATE ESTER COMPRISING FROM 10-50% BY WEIGHT OF SAID ALKYL ACRYLATE ESTER AND FROM 50-90% BY WEIGHT OF SAID ALKYL METHACRYLATE ESTER AND HAVING A RELATIVE VISCOSITY MEASURED IN A 1.0% BY WEIGHT SOLUTION OF THE COPOLYMER IN DIMETHYL FORMAMIDE OF FROM 1.15 TO 2.0 SAID COPOLYMER OF ACRYLATE ESTER AND MTHACRYLATE ESTER BEING PRESENT IN ADMIXTURE WITH SAID COPOLYMER OF VINYL CHLORIDE AND VINYLIDENE CHLORIDE IN AN AMOUNT OF AT LEAST AOBUT 3% BY WEIGHT UP TO ABOUT 20% BY WEIGHT BASED ON THE WEIGHT OF THE MIXTURE OF COPOLYMERS.