Patent ID: 8445581

Claim:
A biocompatible, biodegradable prepolymer composition comprising: hydrophilic prepolymers and hydrophobic prepolymers, wherein at least one of the hydrophobic prepolymers has at least one ethylenically unsaturated functional group and at least 5% of the total number of hydrophilic and hydrophobic prepolymers have two or more ethylenically unsaturated functional groups; and water; wherein the hydrophilic prepolymers are prepared from a polyethylene glycol, polypropylene glycol, polyvinyl alcohol, polythiols based on butanedithiol, hexanedithiol or pentaerythritol tetrakis (3-mercaptopropionate), copolymers of said polythiols, polyacrylamides, polyvinyl pyrolidone, polyhydroxyethyl methacrylate or block, graft or random copolymers thereof; and wherein the hydrophobic prepolymers are prepared from di or higher hydroxyl or amine functionalized oligomers based on esters, carbonates, anhydrides, orthoesters, lactones, phosphazenes.