Patent ID: 9714376
Date: 2017-07-25
CPC Classifications: A61K,A61Q,C08F,C09K

Claim:
1. A yield stress fluid composition comprising water, at least one nonionic, crosslinked, amphiphilic polymer and at least one surfactant wherein the concentration of said polymer ranges from 0.5 to 5 wt. % and the concentration of said surfactant ranges from 1 to 30 wt. % (active weight basis), based on the total weight of the composition, wherein said at least one nonionic, crosslinked, amphiphilic polymer is devoid of ionic or ionizable moieties and is prepared from a monomer mixture comprising at least one hydrophilic monomer selected from a vinyl lactam; at least one hydrophobic monomer selected from one or more vinyl esters of aliphatic carboxylic acids containing 1 to 22 carbon atoms, one or more of esters of (meth)acrylic acid with alcohols containing 1 to 30 carbon atoms, and mixtures thereof, and an associative monomer and/or a semi-hydrophobic monomer, and wherein said yield stress is substantially independent of pH in the pH range from about 2 to about 14.