Patent ID: 6407181
Filing Date: 2002-06-18
Classification: C08L,C09D,Y10T

Abstract:
A coating powder, the composition of which comprisesA) an epoxy component comprising A1) a glycidyl (meth)acrylate copolymer having an epoxy equivalent weight of between 250 and 450, present at between 50 and 100 weight percent of said epoxy component A, A2) a glycidyl (meth)acrylate polymer having an epoxy equivalent weight of between 500 and 800, present at between 0 and 50 weight percent of said epoxy component A, and A3) a crystalline aromatic epoxy having a melting point between 80Â° and 150Â° C., present at between 0 and 20 weight percent of said epoxy component A; and B) a carboxylic acid component comprising B1) a carboxylic acid functional polyester having an acid number between 30 and 60 and a viscosity of 2500 cps or less at 200Â° C., present at between 65 and 100 weight percent of said carboxylic acid component B2) a crystalline polycarboxylic acid or polyanhydride having an acid number between 150 and 400, present at between 0 and 20 weight percent of said carboxylic component B, and B3) an acrylic polymer having an acid number between 100 and 400, present at between 0 and 15 weight percent of said carboxylic acid component B; the stoichiometry of said carboxylic acid component B to said epoxy component A being between 0.7 and 2.7.