Patent ID: 8703897

Claim:
A composition of dental filling materials, comprising: a urethane oligomer having isocyanate terminals obtained from a reaction between natural oil-derived polyols and an excess diisocyanate, wherein the oligomer being grafted with an unsaturated acrylic monomer having hydroxyl groups forming a prepolymer with unsaturated terminals being curable by free radical initiators wherein the natural oil-derived polyol is a reaction product of the oleic acid, phthalic anhydride and glycerol, and wherein the composition further comprises a polyfunctional acrylate monomer comprising 2,2-bis[4-(2-hydroxy-3-methacryloxyprop-1-oxy)phenyl]propane, ethoxylated bisphenol A dimethacrylate, triethylene glycol dimethacrylate, or mixtures thereof.