High solids color coat containing alcohol soluble cellulose acetate butyrate

An acrylic color coat enamel coating composition comprising about 28-45% by weight of a binder of film-forming constituents and correspondingly about 55-72% by weight of a volatile organic solvent carrier at spray viscosity and containing in addition about 2-150% by weight, based on the weight of the binder, of pigment wherein the binder of film-forming constituents consists essentially of about 20-65% by weight, based on the weight of the binder, of an acrylic polymer consisting essentially of 50-90% by weight of an alkyl methacrylate or an alkyl acrylate each having 1-12 carbon atoms in the alkyl groups or a mixture thereof and 10-50% by weight of a hydroxyalkyl acrylate or a hydroxyalkyl methacrylate each having 2-4 carbon atoms in the hydroxyalkyl groups or a mixture thereof and in which the acrylic polymer has a weight average molecular weight of about 2500-25,000 and a glass transition temperature of about -20.degree. C. to +25.degree. C.;

• about 0-40% by weight, based on the weight of the binder, of a hydroxy-terminated polyester urethane resin;
• about 30-40% by weight, based on the weight of the binder, of an alkylated melamine formaldehyde crosslinking agent;
• and about 4-20% by weight, based on the weight of the binder of a rheology control agent consisting essentially of an alcohol soluble cellulose acetate butyrate having a butyryl content of about 45-50% by weight, a hydroxyl content of about 4-5% by weight and a viscosity of about 0.2-0.4 second.

An acrylic color coat enamel coating composition comprising about 33-45% by weight of a binder of film-forming constituents and correspondingly about 55-67% by weight of a volatile organic solvent carrier at spray viscosity and containing in addition about 2-150% by weight, based on the weight of the binder, of pigment wherein the binder of film-forming constituents consists essentially of about

• A. 20-66% by weight, based on the weight of the binder, of an acrylic polymer consisting essentially of
• (1) about 40-80% by weight, based on the weight of the acrylic polymer, of an alkyl methacrylate or an alkyl acrylate each having 1-6 carbon atoms in the alkyl groups or a mixture thereof,
• (2) about 20-40% by weight, based on the weight of the acrylic polymer, of a hydroxyalkyl acrylate or a hydroxyalkyl methacrylate each having 2-4 carbon atoms in the hydroxyalkyl groups or a mixture thereof,
• (3) 0-20% by weight, based on the weight of the acrylic polymer, of styrene;
• and
• wherein the acrylic polymer has a weight average molecular weight of about 3000-12,000 and a glass transition temperature of about -20.degree. C. to +25.degree. C.;
• B. 0-20% by weight, based on the weight of the binder, of a hydroxy-terminated polyester urethane resin having a number average molecular weight of about 4000-10,000;
• C. 30-40% by weight, based on the weight of the binder, of a fully alkylated melamine formaldehyde crosslinking agent having 1-4 carbon atoms in the alkyl groups;
• D. 4-20% by weight, based on the weight of the binder, of an alcohol soluble cellulose acetate butyrate rheology control agent having a butyryl content of about 45-50% by weight, a hydroxyl content of about 4-5% by weight and a viscosity of about 0.2-0.4 second;
• E. 0.3-10% by weight, based on the weight of the binder, of an alkyl sulfonic acid or an aryl sulfonic acid catalyst each fully neutralized with n-propylamine or 4,4-dimethyloxazolidine;
• F. 0-3% by weight, based on the weight of the binder, of an ultraviolet light absorber;
• and
• G. 0-2% by weight, based on the weight of the binder, of a hindered amine light stabilizer.

An acrylic color coat enamel coating composition comprising about 28-40% by weight of a binder of film-forming constituents and correspondingly about 60-72% by weight of a volatile organic solvent carrier at spray viscosity and containing in addition about 2-150% by weight, based on the weight of the binder, of pigment wherein the binder of film-forming constituents consists essentially of about

• A. 20-58% by weight, based on the weight of the binder, of an acrylic polymer consisting essentially of
• (1) about 50-88%, based on the weight of the acrylic polymer, of an alkyl methacrylate or an alkyl acrylate each having 1-6 carbon atoms in the alkyl groups or a mixture thereof,
• (2) about 10-25% by weight, based on the weight of the acrylic polymer, of a hydroxyalkyl acrylate or a hydroxyalkyl methacrylate each having 2-4 carbon atoms in the hydroxyalkyl groups or a mixture thereof,
• (3) about 2-5% by weight, based on the weight of the acrylic polymer, of acrylic acid or methacrylic acid,
• (4) 0-20% by weight, based on the weight of the acrylic polymer, of styrene;
• and
• wherein the acrylic polymer has a weight average molecular weight of about 10,000-25,000 and a glass transition temperature of about -20.degree. C. to +25.degree. C.;
• B. 10-40% by weight, based on the weight of the binder, of a hydroxy-terminated polyester urethane resin having a number average molecular weight of about 4000-10,000;
• C. 28-38% by weight, based on the weight of the binder, of a partially alkylated, polymeric melamine formaldehyde resin having 1-4 carbon atoms in the alkyl groups;
• D. 4-20% by weight, based on the weight of the binder, of an alcohol soluble cellulose acetate butyrate rheology control agent having a butyryl content of about 45-50% by weight, a hydroxyl content of about 4-5% by weight and a viscosity of about 0.2-0.4 second;
• E. 0-2% by weight, based on the weight of the binder, of a catalyst comprising phosphoric acid, an alkyl acid phosphate or an aryl acid phosphate;
• F. 0-3% by weight, based on the weight of the binder, of an ultraviolet light absorber;
• and
• G. 0-2% by weight, based on the weight of the binder, of a hindered amine light stabilizer.