Patent ID: 7999023
Filing Date: 2011-08-16
Classification: A61L,C08F,C08L,C09J

Abstract:
1. A process for preparing a pressure sensitive adhesive hydrogel, comprising: (A) providing an oligomeric precursor, the oligomeric precursor comprising a an alkylene oxide moiety endcapped with ethylenic unsaturation, the oligomeric precursor being associated with methacrylic acid, wherein the alkylene oxide moiety is of the formula: wherein the mole ratio of m:n is within a range of 1:9 to 9:1, and R 1 is a (C1-C4)alkyl group or H; (B) providing an ethylenically unsaturated crosslinking agent selected from the group consisting of difunctional ethylenically unsaturated monomer, trifunctional ethylenically unsaturated monomer and combinations of the foregoing; and (C) free radically curing the oligomeric precursor and the ethylenically unsaturated crosslinking agent in water in the presence of the methacrylic acid while controlling the pH to be between 3.5 and 9 during curing to provide the pressure sensitive adhesive hydrogel.