Patent ID: 9029465
Filing Date: 2015-05-12
Classification: C08F,C09D

Abstract:
1. A process comprising the steps of: a) contacting under emulsion polymerization conditions a first portion of an acrylic monomer with a first portion of a phosphorus acid monomer to form a first stage polymer; and b) contacting the first stage polymer with a second portion of an acrylic monomer and a second portion of a phosphorus acid monomer under emulsion polymerization conditions to form a latex polymer; wherein the amount of the first portion of the phosphorus acid monomer is from 2 to 8 weight percent of the weight of the first stage polymer; the weight of the second portion of the phosphorus acid monomer is from 15 to 40 weight percent of the weight of the first portion of acid monomer; the first portion of the acrylic monomer is from 5 to 50 weight percent of the first and second portions of acrylic monomer; with the proviso that the monomers are selected so that the T g of the latex polymer is in the range of −20 to 50° C.