Thermosetting acrylic enamel containing an acrylic polymer and butylated melamine formaldehyde resin

Claim 1

A THERMOSETTING ACRYLIC ENAMEL COATING COMPOSITION COMPRISING 10-50% BY WEIGHT OF FILM-FORMING CONSTITUENTS AND CORRESPONDINGLY 90-50% BY WEIGHT OF A SOLVENT FOR THE FILM-FORMING CONSTITUENTS, WHEREIN THE FILM-FORMING CONSTITUENTS CONSIST ESSENTIALLY OF AN INCOMPATIBLE BLEND OF 1. 50-85% BY WEIGHT, BASED ON THE WEIGHT OF THE FILM-FORMING CONSTITUENTS, OF AN ACRYLIC POLYMER CONSISTING ESSENTIALLY OF A. 30% BY WEIGHT, BASED ON THE WEIGHT OF THE ACRYLIC POLYMER, OF STYRENE, B. 22% BY WEIGHT BASED ON THE WEIGHT OF THE ACRYLIC POLYMER, OF METHYL METHACRYLATE, C. 37% BY WEIGHT, BASED ON THE WIGHT OF THE ACRYLIC POLYMER, OF BUTYL ACRYLATE, D. 10% BY WEIGHT, BASED ON THE WEIGHT OF THE ACRYLIC POLYMER, OF A HYDROXY ETHYL ACRYLATE, E. 1% BY WEIGHT, BASED ON THE WEIGHT OF THE ACRYLIC POLYMER, OF ACRYLIC ACID, WHEREIN THE ACRYLIC POLYMER HAS AN ACID NUMBER OF ABOUT 1-16 AND A RELATIVE VISCOSITY OF ABOUT 1.04-1.10 MEASURED AT 25*C. IN DICHLOROETHANE ACCORDING TO ASTM-D-445-46 T, METHOD B, AND 2. 15-50% BY WEIGHT, BASED ON THE WEIGHT OF THE FILM-FORMING CONSTITUENTS, OF A BUTYLATED MELAMINE FORMALDEHYDE RESIN IN WHICH THE MOLAR RATIO OF MELAMINE/FORMALDEHYDE/BUTANOL IS 1/4-6/1-3 AND HAVING A VISCOSITY OF 300-800 CENTISTROKES MEASURED AT 25*C. ACCORDING TO ASTM-D-1545-63.