| abstract |
A hydrogel composition formed by a discontinuous hydrophobic phase and a hydrophilic phase, in which: (a) the discontinuous hydrophobic phase comprises (i) a crosslinked hydrophobic polymer, (ii) a plasticizer, (iii) an adherent resin, and ( iv) an optional antioxidant; and (b) the hydrophilic phase is indistinctly discontinuous or continuous, in which when the hydrophilic phase is continuous, the hydrophilic phase comprises a water-swellable cellulosic ester polymer composition that is insoluble in water at pH of less than 8.5 , or a water-swellable copolymer formed from two or more of acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, methyl methacrylate, and ethyl methacrylate that is insoluble in water at pH of less than 5.5 . |