Patent ID: 7173085
Filing Date: 2007-02-06
Classification: C08F

Abstract:
1. An aqueous emulsion comprising a water-dispersible copolymer which is non-dispersible in aqueous solutions containing 0.5% or more of an inorganic salt, wherein the water-dispersible copolymer comprises in percentages by weight: (A) from about 10% to about 90% of an acidic ethylenically unsaturated monomer; and (B) from about 10% to about 90% of an ethylenically unsaturated monomer selected from the group of monomer formulas consisting of: wherein R 1 is hydrogen or methyl and R 2 is —OZ′ or —N(Z″)(Z″), wherein Z′ is an alkyl group having from 1 to 7 carbon atoms, and Z″ is independently selected from the group consisting of hydrogen and alkyl groups having from 1 to 6 carbon atoms; R 3 and R 4 are independently hydrogen or an alkyl group having from 1 to 7 carbon atoms, with the proviso that R 3 and R 4 are not both hydrogen; R 5 is hydrogen or methyl and R 6 is an alkyl group having from 1 to 7 carbon atoms; R 7 and R 8 are independently hydrogen or an alkyl group having from 1 to 7 carbon atoms, with the proviso that R 7 and R 8 are not both hydrogen; R 9 is an alkyl group having from 1 to 7 carbon atoms; R 10 and R 11 are hydrogen; R 12 and R 13 are independently selected from the group consisting of hydrogen, —CN, —NHCHO, —NHCOCH 3 , and an alkyl group having from 1 to 7 carbon atoms; and the copolymer has a weight average molecular weight greater than about 25,000 and is present in an amount from about 20% to about 70%.