Patent ID: 6184311
Filing Date: 2001-02-06
Classification: C08K,C08L,C09D,Y10S,Y10T

Abstract:
A thermosetting powder coating composition comprising as binder a co-retractable particulate mixture of a carboxylic acid-functional polyester component and a curing agent having groups reactive with carboxylic acid groups, wherein the carboxylic acid-functional component comprises:(A) at least one semi-crystalline polyester having one or more Tg values no more than 55.degree. C., a sharp melting point of from 50.degree. C. to 200.degree. C., an acid value of from 10 to 70 mg KOH per gram and a number average molecular weight of at least 1600, in an amount of from about 5% to about 90% by weight, and(B) at least one amorphous polyester containing from 65 to 100% by weight of isophthalic acid, calculated on all of the acid constituents, having a Tg of at least 30.degree. C. and an acid number of from 15 to 90 mg KOH per gram in an amount of from about 10% to about 95% by weight, the weight of the amorphous polyester being calculated on the combined weight of the total polyesters (A) and (B).