Patent ID: 7276189

Claim:
A light polymerizable resin material consisting essentially of, based on a total of 100% by weight, exclusive of photoinitiator, bisphenol A ethoxylate (1 to 4) dimethacrylate, about 70 to about 90%, by weight; benzylmethacrylate, about 10 to about 20%, by weight; one or more stabilizing monomers, about 1 to 10% by weight, the stabilizing monomers being selected from the group consisting of trimethylolpropane trimethacrylate, isobornyl methacrylate, ethoxylate nonyiphenol, 2-phenoxyethyl methacrylate-esters, ethoxylate nonyl phenol acrylate; optionally one or more photochromatic dyes; optionally one or more UV stabilizers; optionally one or more dye stabilizers; and one or more photoinitators.