Catalyzing cationic resin and blocked polyisocyanate with bismuth carboxylate
AssigneeKing Industries, Inc.
InventorsZhiqiang He, Werner J. Blank, Marie E. Picci
Life of this patent
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Abstract
A method of catalyzing a cationic coating comprising a cationic resin such as an epoxy resin-amine reaction product or a copolymer of a cationic monomer, and a blocked polyisocyanate, wherein a catalyst is added, said catalyst selected from the group consisting of bismuth carboxylate(s) having a hydrocarbon chain of from 11 to 36 carbon atoms and a molecular weight of from 165-465, and a mixture of a bismuth salt selected from the group consisting of bismuth oxide and bismuth chloride, and a carboxylic acid having a hydrocarbon chain of from 11 to 36 carbon atoms and a molecular weight of from 165-465.
Claims11
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, ε-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.
A method of catalyzing a cationic coating by adding a catalyst selected from the group consisting of
- a) bismuth carboxylate having a hydrocarbon chain of 11 to 36 carbons and a molecular weight in the range of 165-465;
- b) a mixture of a bismuth salt, selected from the group consisting of bismuth oxide and bismuth chloride, and a carboxylic acid having a hydrocarbon chain of 11 to 36 carbons and a molecular weight in the range of 165-465;
- and
- c) 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 to a cationic coating formulation consisting of a cationic resin, and a blocked polyisocyanate wherein the cationic resin is selected from the group consisting of:
- i) an epoxy-amine reaction product of a bisphenol A epoxy resin with an epoxy 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 a cationic monomer selected from the group consisting of dimethyl-amino-propyl-methacrylate, dimethyl-amino-ethyl-methacrylate, dimethyl-amino-propyl-acrylamide and t-butyl-amino-ethyl acrylate with an acrylic or methoacrylic ester monomer other than a cationic monomer optionally with styrene or acrylonitrile.
Dependencies are inferred from the claim text.