Patent ID: 6313224
Filing Date: 2001-11-06
Classification: C09D,Y10T

Abstract:
A curable powder coating composition comprising:(I) from 80 to 99.99 percent by weight based on solids of the curable coating composition of at least one film-forming resinous material, and(II) from 0.01 to 3 percent by weight based on total resin solids of the curable coating composition of a functional flow control copolymer having a calculated T.sub.g of less than 0.degree. C., wherein the functionality is acid and hydroxyl, and wherein the copolymer (A) is prepared from polymerizing polymerizable ethylenically unsaturated monomers comprising:(1) 40 to 99 percent by weight of the copolymer of at least one non-amino, non-hydroxyl and non-acid functional alkyl acrylate or methacrylate containing from 1 to 20 carbon atoms in the alkyl group, and(2) functional monomers selected from the group consisting of one or more acid functional monomers selected from the group consisting of acid functional acrylates, acid functional methacrylates and mixtures thereof in an effective amount of 1 to 10 percent by weight of the copolymer to give the copolymer an acid value in the range of from 10 to 30 and one or more hydroxyl functional monomers in an effective amount of 1 to 25 percent by weight of the copolymer, wherein the weight percentages of monomers in (1) and (2) sum to 100 percent.