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Epoxy modified acrylic latices and method of producing same

  • US 4,028,294 A
  • Filed: 11/10/1975
  • Issued: 06/07/1977
  • Est. Priority Date: 11/10/1975
  • Status: Expired due to Term
First Claim
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1. A method of producing a thermosetting aqueous latex comprising dissolving a polyepoxide which is a diglycidyl ether of a bisphenol having a molecular weight in the range of 350-4000 into at least one of the monoethylenically unsaturated monomers to be polymerized, said monomers including from 2 to 30% of monoethylenic carboxylic acid, and the balance of said monomers consisting essentially of nonreactive monoethylenic monomers, emulsifying said monomers and polyepoxide in water with the aid of from 0.25-3 parts of surfactant per 100 parts of said monomers, polymerizing said monomers in said aqueous emulsion with the aid of a free radical polymerization catalyst and at a temperature below which said carboxylic acid will react with the epoxy groups of said polyepoxide, the relative proportion of said polyepoxide and said carboxylic acid monomer varying from about a stoichiometrically equivalent amount up to a 50% equivalent excess of said carboxylic acid monomer, and adding ammonia to said latex to provide a pH of 7.0-9.0 to stabilize the latex and catalyze the cure thereof.

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