Patent ID: 9133350
Filing Date: 2015-09-15
Classification: C09D

Abstract:
1. An improved cathodic electrocoating composition, comprising an aqueous emulsion having dispersed therein a crosslinkable component and a crosslinking agent and further comprising a non-water reducible anticrater agent comprising a polyester which is the reaction product of (d) a polyepoxy compound and an intermediate polyester which is the reaction product of a monomer mixture consisting of (a) a cyclic aliphatic carboxylic acid anhydride, (b) a monofunctional epoxy compound, and (c) a monofunctional alcohol wherein the cyclic aliphatic carboxylic acid anhydride comprises one or more side chains selected from the group consisting of an alkyl side chain having in the range of from 6 to 20 carbon atoms, an alkenyl side chain having in the range of from 6 to 20 carbon atoms and a combination thereof, wherein the non-water reducible anticrater agent has a solubility in water of less than 0.5 grams/liter, and wherein the intermediate polyester has a molecular weight per epoxy group of greater than 15,000 Daltons.