Patent ID: 8343391

Claim:
A photochromic matrix layer composition comprising: a monomer mixture comprising: a flexible hydrophilic dimethacrylate monomer, comprising at least one of a polyethylene glycol dimethacrylate, a urethane dimethacrylate, an epoxy dimethacrylate and/or a polyester dimethacrylate; a hydrophobic monomer, comprising at least one of isobornyl methacrylate, 1,12-dodecanediol dimethacrylate and/or tridecyl methacrylate; a flexible hydrophobic multi(meth)acrylate monomer, comprising at least one of trimethylolpropane trimethacrylate, bis(trimethylolpropane) tetraacrylate, bis(trimethylolpropane) tetramethacrylate, an alkoxylated trimethylolpropane trimethacrylate, an alkoxylated bis(trimethylolpropane) tetramethacrylate, a urethane methacrylate with three or more methacrylate groups, an epoxy methacrylate with three or more methacrylate groups and/or a polyester methacrylate with three or more methacrylate groups; a urethane methacrylate oligomer, comprising at least one of a polyether urethane dimethacrylate and/or a polyether urethane trimethacrylate; and a photochromic dye.