Patent ID: 7250448
Filing Date: 2007-07-31
Classification: C08F,D21H,Y10S

Abstract:
1. A water-soluble copolymer composition comprising at least one associative inverse emulsion anionic copolymer, wherein the associative properties of the at least one associative inverse emulsion anionic copolymer are provided by an effective amount of at least one emulsification surfactant chosen from diblock and triblock polymeric surfactants wherein said at least one associative inverse emulsion anionic copolymer comprises: at least one nonionic polymer segment B comprised of one or more ethylenically unsaturated nonionic monomers, and at least one anionic polymer segment F comprised of one or more ethylenically unsaturated anionic monomers; the molar % ratio of B:F is from 95:5 to 5:95; and wherein said at least one associative inverse emulsion anionic copolymer has a Huggins' constant (k′) determined in 0.01 M NaCl greater than 0.75; and said at least one associative inverse emulsion anionic copolymer has a storage modulus (G′) in a 1.5 wt. % actives polymer solution at 4.6 Hz greater than 175 Pa.