Patent ID: 9259504
Filing Date: 2016-02-16
CPC Classification: A61K,A61L,A61Q,B05D

Claim Text:
1. A hydrogel composition comprised of a discontinuous hydrophobic phase and a continuous hydrophilic phase, wherein: (a) the discontinuous hydrophobic phase comprises (i) a butyl rubber, (ii) a plasticizer, (iii) a tackifying resin, and (iv) an optional antioxidant; and (b) the continuous hydrophilic phase comprises (i) a water-swellable cellulosic ester that is insoluble in water at a pH of less than 8.5, (ii) a blend of a poly(N-vinyllactam) and a complementary oligomer capable of hydrogen bonding thereto, where the complementary oligomer is either a polyalkylene glycol or a carboxyl-terminated polyalkylene glycol, and (iii) an optionally added low molecular weight plasticizer, wherein the butyl rubber represents about 5 wt. % to 15 wt. % of the composition, the water-swellable cellulosic ester represents approximately 2 wt. % to approximately 15 wt. % of the composition, the poly(N-vinyllactam) and the complementary oligomer together represent approximately 17.5 wt. % to approximately 45 wt. % of the composition, the low molecular weight plasticizer, when present, represents approximately 2.5 wt. % to approximately 5.0 wt. % of the hydrogel composition, the weight ratio of the poly(N-vinyllactam) to the complementary oligomer is in a range of about 70:30 to about 40:60, and the composition is non-electrically conductive.