Patent ID: 6353057
Filing Date: 2002-03-05
Classification: C08G,C09D

Abstract:
A cationic coating formulation consisting of a blend of:a) a cationic resin selected from the group consisting of i) an epoxy-amine reaction product of a bisphenol A epoxy resin with an epoxy equivalent weight of between 200 and 2000 and an amine selected from the group consisting of a primary amine, a secondary amine and a tertiary amine; and ii) copolymers of cationic monomers selected from the group consisting of cdimethyl-amino-propyl-methacrylate, climethyl-amino-ethyl-methacrylate, dimethyl-amino-propyi-acrylamicl and t-butyl-amino-ethyl acrylate with an acylic or methacrylic ester monomer other than the cationic monomers optionally with styrene or acrylonitrile; b) a blociced polyisocyanate crosslinker selected from the group consisting of an aromatic and an aliphatic polyisocyanate with a blocking group selected from the group consisting of malonates, triazoles, &egr;-caprolactam, phenols, ketoxime, pyrazoles, alcohols, glycols and glycol ethers; and c) 0.01 to 1.0 wt % metal based on the total weight of the carionic resin blend of a bismuth catalyst selected from the group consisting of: i) bismuth carboxylate wherein the carboxylate has a hydrocarbon chain of 11-36 carbons, a molecular weight in the range of 165-465; ii) a mixture of bismuth oxide with a carboxylic acid having a hydrocarbon chain of 11-36 carbons, a molecular weight in the range of 16-465; and iii) a mixture of bismuth carboxylates wherein each carboxylate has a hydrocarbon chain of 11-36 carbons, a molecular weight in the range of 165-465.