Primer composition and metal base coated therewith

Claim 1

A METHOD OF COATING A METAL BASE TO PROVIDE AN ADHERENT LAYER OF VINYL RESIN COMPRISING APPLYING TO A SURFACE OF SAID BASE A FILM OF A MIXTURE OF RESIN COMPONENTS DISSOLVED IN AN ORGANIC SOLVENT, SAID MIXTURE OF RESIN COMPONENTS COMPRISING AN HYDROXYL-CONTAINING POLYEPOXIDE PRESENT IN AN AMOUNT SUFFICIENT TO SUPPLY FROM 0.03-0.055 MOL OF HYDROXYL RADICAL PER 100 PARTS OF TOTAL RESIN SOLIDS, SAID MIXTURE OF RESINS INCLUDING FOR EACH MOLECULAR EQUIVALENT OF HYDROXYL RADICAL SUPPLIED BY SAID POLYEPOXIDE, (1) A POLYISOCYANATE COMPONENT IN AN AMOUNT TO PROVIDE FROM 0.5-1.0 MOL OF ISOCYANATE RADICAL, (2) A SOLVENT-SOLUBLE CARBOXYL-CONTAINING VINYL RESIN COMPONENT PROVIDING FROM 0.05-0.07 MOL OF CARBOXYL RADICAL, SAID VINYL RESIN COMPONENT CONTAINING POLYMERIZED THEREIN CARBOXYLIC MONOMER SELECTED FROMTHE GROUP CONSISTING OF ALIPHATIC, ALPHA, BETA-MONOETHYLENICALLY UNSATURATED CARBOXYLIC ACIDS, ANHYDRIDES OF SAID ACIDS AND PARTIAL ALKYL ESTERS OF SAID ACIDS, SAID CARBOXYLIC MONOMER PROVIDING SAID VINYL RESIN COMPONENT WITH FROM 0.1-3.0% BY WEIGHT OF FREE CARBOXYL RADICAL AND (3) A METHYL METHACRYLATE POLYMER CONTAINING AT LEAST 75% BY WEIGHT OF POLYMERIZED METHYL METHACRYLATE WITH ANY BALANCE OF SAID POLYMER BEING POLYMERIZED MONOVINYLIDENE MONOMER, SAID METHYL METHACRYLATE POLYMER BEING PRESENT IN AN AMOUNT TO PROVIDE A WEIGHT RATIO OF SAID VINYL RESIN COMPONENT TO METHYL METHACRYLATE POLYMER OF FROM 0.9:1.0 TO 1.6:1.0, BAKING SAID FILM AT A TEMPERATURE OF AT LEAST 300* F. TO REMOVE SAID ORGANIC SOLVENT AND TO CAUSE SAID RESIN COMPONENTS TO INTERACT WITH ONE ANOTHER, APPLYING UPON SAID BAKED FILM OF PRIMER A TOPCOAT OF VINYL RESIN SELECTED FROM THE GROUP CONSISTING OF PLASTISOLS AND ORGANOSOLS CONTAINING POLYVINYL CHLORIDE, COPOLYMERS OF VINYL CHLORIDE WITH UP TO 10% BY WEIGHT OF VINYL ACETATE AND COPOLYMERS OF VINYL CHLORIDE WITH UP TO 10% BY WEIGHT OF VINYLIDENE CHLORIDE AND BAKING SAID TOPCOAT TO FUSE SAID VINYL RESIN TO SAID FILM OF BAKED PRIMER.

Claim 2

A METHOD OF COATING A METAL BASE TO PROVIDE AN ADHERENT LAYER OF VINYL RESIN COMPRISING APPLYING TO A SURFACE OF SAID BASE A FILM OF A MIXTURE OF RESIN COMPONENTS DISSOLVED IN AN ORGANIC SOLVENT, SAID MIXTURE OF RESIN COMPONENTS COMPRISING AN HYDROXYL-CONTAINING POLYEPOXIDE PRESENT IN AN AMOUNT SUFFICIENT TO SUPPLY FROM 0.03-0.055 MOL OF HYDROXYL RADICAL PER 100 PARTS OF TOTAL RESIN SOLIDS, SAID MIXTURE OF RESINS INCLUDING FOR EACH MOLECULAR EQUIVALENT OF HYDROXYL RADICAL SUPPLIED BY SAID POLYEPOXIDE, (1) A POLYISOCYANATE COMPONENT IN AN AMOUNT TO PROVIDE FROM 0.5-1.0 MOL OF ISOCYANATE RADICAL, (2) A SOLVENT-SOLUBLE CARBOXYL-CONTAINING VINYL RESIN COMPONENT PROVIDING FROM 0.05-0.07 MOL OF CARBOXYL RADICAL, SAID VINYL RESIN COMPONENT CONTAINING POLYMERIZED THEREIN CARBOXYLIC MONOMER SELECTED FROMTHE GROUP CONSISTING OF ALIPHATIC, ALPHA, BETA-MONOETHYLENICALLY UNSATURATED CARBOXYLIC ACIDS, ANHYDRIDES OF SAID ACIDS AND PARTIAL ALKYL ESTERS OF SAID ACIDS, SAID CARBOXYLIC MONOMER PROVIDING SAID VINYL RESIN COMPONENT WITH FROM 0.1-3.0% BY WEIGHT OF FREE CARBOXYL RADICAL AND (3) A METHYL METHACRYLATE POLYMER CONTAINING AT LEAST 75% BY WEIGHT OF POLYMERIZED METHYL METHACRYLATE WITH ANY BALANCE OF SAID POLYMER BEING POLYMERIZED MONOVINYLIDENE MONOMER, SAID METHYL METHACRYLATE POLYMER BEING PRESENT IN AN AMOUNT TO PROVIDE A WEIGHT RATIO OF SAID VINYL RESIN COMPONENT TO METHYL METHACRYLATE POLYMER OF FROM 0.9:1.0 TO 1.6:1.0, BAKING SAID FILM AT A TEMPERATURE OF AT LEAST 300* F. TO REMOVE SAID ORGANIC SOLVENT AND TO CAUSE SAID RESIN COMPONENTS TO INTERACT WITH ONE ANOTHER, APPLYING UPON SAID BAKED FILM OF PRIMER A TOPCOAT OF VINYL RESIN SELECTED FROM THE GROUP CONSISTING OF PLASTISOLS AND ORGANOSOLS CONTAINING POLYVINYL CHLORIDE, COPOLYMERS OF VINYL CHLORIDE WITH UP TO 10% BY WEIGHT OF VINYL ACETATE AND COPOLYMERS OF VINYL CHLORIDE WITH UP TO 10% BY WEIGHT OF VINYLIDENE CHLORIDE AND BAKING SAID TOPCOAT TO FUSE SAID VINYL RESIN TO SAID FILM OF BAKED PRIMER.