US 5,157,078 AGranted

Glycidyl-epoxy-acrylic copolymers

AssigneeThe Glidden Company

InventorsJames T. K. Woo, Gary C. Pompignano, Kevan A. Packard

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Abstract

A protective paint coating containing a polymeric binder having both hydrophobic and hydrophilic moieties in the polymeric structure comprises an acrylic-graft terpolymer. The terpolymer comprises aliphatic-modified glycidyl acrylate and epoxy resin coreacted with diphenol to form the terpolymer. Ethylenically unsaturated monomers, including carboxyl monomers, are in-situ copolymerized in the presence of the terpolymer to produce the acrylic-graft terpolymer. The aliphatic-modified glycidyl acrylate component of the terpolymer comprise the reaction product of a glycidyl acrylate and a branched aliphatic ethylenic monomer having a branched chain of 2 to 20 carbon atoms. The branched aliphatic chain and the carboxyl functionality provide the self-contained wetting agent properties to the polymeric binder structure.

Claims10

Dependent claims

In a process for producing a protective coating composition containing a polymeric binder, the process steps comprising:

providing an aliphatic modified glycidyl acrylate polymer by copolymerizing a glycidyl acrylate monomer with an ethylenically unsaturated monomer;
coreacting the aliphatic-modified glycidyl acrylate polymer with a diphenol and an epoxy resin to produce a glycidyl-diphenol-epoxy terpolymer;
in-situ copolymerizing ethylenically unsaturated monomers including carboxyl monomers in the presence of the terpolymer in the presence of at least 3% by peroxide based on the weight of ethylenically unsaturated monomers copolymerized at temperatures between about 70.degree. C. to 170.degree. C. to produce an acrylic-graft terpolymer containing hydrophobic and hydrophilic wetting properties, said acrylic-graft terpolymer comprising on a weight basis between about 2% and 20% of said aliphatic-modified glycidyl acrylate, between about 0.2% and 30% diphenol, and between about 30% and 80% epoxy resin, and between about 15% and 25% said copolymerized ethylenically unsaturated monomers.

Dependencies are inferred from the claim text.