Patent ID: 8541021
Filing Date: 2013-09-24
Classification: A61C,A61K,A61L,A61Q

Abstract:
1. A body surface contacting composition comprising: (a) a first water-swellable acrylate-based polymer having a pH-dependent solubility and insoluble in water at a pH less than about 5.5, (b) a blend of a poly(N-vinyl lactam) and a complementary oligomer capable of hydrogen bonding to the poly(N-vinyl lactam); and (c) a second water-swellable acrylate-based polymer that is insoluble in water independent of pH; in a solvent or mixture of solvents, wherein the weight ratio of the first to second water-swellable acrylate-based polymers is in a range of about 1.5:1 to 2:1 and the poly(N-vinyl lactam) represents about 1-30 weight percent of the composition, such that when the composition is placed in an aqueous environment at a pH of from about 6-8, the second water-swellable acrylate-based polymer forms a film over the remainder of the composition.