Patent ID: 7947784
Filing Date: 2011-05-24
Classification: C08F,C08J,Y10S

Abstract:
1. A method of forming a modified hydrogel material by reactive compounding, comprising: mixing a hydrogel material in an extrusion reactor at a temperature of about 70° C. to about 400° C.; and during mixing, adding to the extrusion reactor a reactive chemical compound selected from the group consisting of carboxyl-terminated poly-N-vinylpyrrolidone, carboxyl-terminated poly-2-vinyl pyridine, carboxyl-terminated poly-N-vinyl imidazole, and alpha-methoxy-omega-succinic acid terminated polyethylene glycol, and combinations thereof to react with the hydrogel material to form a modified hydrogel material, and wherein the modified hydrogel material has a polymer concentration of greater than about 30% w/v.