Patent ID: 9169419
Filing Date: 2015-10-27
Classification: C08K,C08L,C09D,Y10T

Abstract:
1. A thermosetting powder coating composition comprising a crosslinker and a polyester, wherein the crosslinker is a compound having β-hydroxyalkylamide groups, and wherein the polyester is a carboxylic acid functional polyester, and wherein the polyester has functional groups capable of reacting with β-hydroxyalkylamide groups, and wherein the polyester is prepared from at least the following monomers: neopentylglycol, a difunctional alcohol other than neopentyl glycol (DFA); isophthalic acid (IPA), terephthalic acid (TPA), optionally adipic acid, and a branching monomer selected from the group consisting of at least trifunctional carboxylic acid, an at least trifunctional alcohol, at least trifunctional hydroxy carboxylic acid, and mixtures thereof, and wherein the DFA is present in the polyester from 1 to 50% w/w, and wherein the IPA is present in the polyester from 6 to 30% w/w, and wherein the molar ratio of TPA to IPA is at least 1.1, and wherein the polyester has a functionality of at least 2.1 and at most 4.0, and wherein the polyester has an acid value of at most 65 mg KOH/g, and wherein the polyester has a hydroxyl value of at most 14 mg KOH/g, and wherein the polyester has a glass transition temperature of at least 20° C. and of at most 120° C. measured via DSC at a heating rate of 5° C./min, and wherein the polyester has a viscosity of at most 200 Pa·s measured at 160° C. using a cone and plate rheometer Brookfield CAP 2000+ Viscometer with spindle CAP-S-05 at 21 rpm and a shear rate 70 s-1 and wherein % w/w is based on the polyester.