Patent ID: 8716367
Filing Date: 2014-05-06
Classification: C09D

Abstract:
1. A coating powder composition that provides a clear coat or tinted clear coat powder coating comprising an epoxy functional acrylic copolymer component that is one epoxy functional acrylic copolymer or a mixture of two or more copolymers, the epoxy functional acrylic copolymer component having a Tg of from 40° C. to 90° C. and comprising, as copolymerized monomers, i) from 10 to 28 wt. % of one or more epoxy functional unsaturated monomer; ii) from 6.0 wt. % to 13 wt. % of one or more hydrophobic acrylic monomer that has a mass solubility in water of 3.5 g/L or less and which would itself form a homopolymer having a glass transition temperature (Tg) of 50° C. to 175° C., and iii) the remainder of one or more nonionic comonomer that differs from hydrophobic acrylic monomer ii), each monomer wt. % based on the total weight of copolymerized monomers in the epoxy functional acrylic copolymer component; one or more crosslinker for the acrylic copolymer; and, wherein, when the epoxy functional acrylic copolymer component comprises one epoxy functional acrylic copolymer, the coating powder further comprises one or more adjuvant chosen from a hydrophobic submicron particle, an adhesion promoter, a light stabilizer, and an ultraviolet (UV) absorber.