Direct to metal polyurethane coating compositions
AssigneeRhodia Inc.
InventorSatyen Trivedi
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Abstract
The invention is directed to a direct to metal coating composition containing an acrylic polyol synthesized with a phosphated monomer having improved adhesion and corrosion resistance characteristics. The invention is also directed to a method for producing a direct to metal coating composition containing an acrylic polyol synthesized with a phosphated monomer on a substrate by applying the coating composition of the invention to a metal surface. The invention is further directed to an acrylic polyol synthesized with a phosphated monomer coated article having improved adhesion and corrosion resistance characteristics.
Claims42
A composition comprising:
- a high monoester content polyalkylene oxide (meth)acrylated polymerizable phosphate ester mixed with or synthesized into a film-forming polymer, and a cross-linking agent having functional groups selected from the group consisting of isocyanate groups, epoxy groups, acid groups, and amine groups.
A two-component coating composition comprising:
- a) a film-forming component, wherein the film-forming component comprises a film-forming polymer synthesized with a polyalkylene oxide (meth) acrylate polymerizable phosphate ester, said phosphate ester having a mono-phosphate ester to di-phosphate ester weight ratio greater than 80:20;
- and
- b) a cross-linking component, wherein said cross-linking component comprises a cross-linking agent having functional groups selected from the group consisting of isocyanate groups, epoxy groups, acid groups, and amine groups.
A method of making a coating composition, said method comprising the steps of
- a) synthesizing a polymer with a polymerizable adhesion promoter, or a salt thereof, having the formula:
- R1—C(O)—R2—OPO3H2
- wherein R1 is an optionally substituted vinyl radical, R2 is a divalent polyoxyalkylene radical or a polyoxyalkylene in a block or random pattern, and wherein in the ester the mono-phosphate ester to di-phosphate ester weight ratio is greater than 80:20 to form a polymer containing polymerizable adhesion promoter;
- b) adding a cross-linking agent to said polymer containing polymerizable adhesion promoter, said cross-linking agent having functional groups selected from the group consisting of isocyanate groups, epoxy groups, acid groups, and amine groups;
- c) curing said cross-linking agent and said polymer containing polymerizable adhesion promoter to provide a cross-linked coating composition.
Dependencies are inferred from the claim text.