Patent ID: 7932337

Claim:
An inverse emulsion comprising an aqueous phase and an organic phase, wherein the weight ratio of the aqueous phase to the organic phase is from 4:1 to 2:1 and the inverse emulsion includes from 20 to 70% by weight of an acrylic polymer consisting essentially of the inverse emulsion polymerization of: (i) from 90 to 99.9% by weight of an anionic acrylic monomer containing a strongly acidic functional group; (ii) from 0.1 to 10% by weight of a cationic acrylic monomer of the formula (I): wherein: R 1 is hydrogen or methyl; R 2 , R 3 , and R 4 are, one independently of the others, hydrogen or C 1 -C 4 alkyl; Y is NH or O; A is a C 1 -C 6 alkylene; X is an anion; and wherein the acrylic polymer obtained by inverse emulsion polymerization is cross-linked with from 0.01 to 1% by weight of a compound containing two or more ethylenic groups.