Patent ID: 7488510
Filing Date: 2009-02-10
Classification: G02B

Abstract:
1. A method of preparing a photochromic polycarbonate lens, the method comprising: providing a polycarbonate lens blank; applying a tie coating composition to the lens blank, the tie coating composition comprising a methacrylate monomer, a (meth)acrylated oligomer with a polycarbonate backbone, a urethane methacrylate oligomer, and a solvent; allowing the solvent to evaporate to form a tie coating layer; partially polymerizing the tie coating layer; applying a photochromic matrix layer composition to the tie coating layer, the photochromic matrix layer composition comprising a monomer mixture comprising a flexible hydrophilic dimethacrylate monomer, a hydrophobic monomer, a flexible hydrophobic multi(meth)acrylate monomer, and a urethane methacrylate oligomer, wherein the multi(meth)acrylate monomer contains three or more methacrylate groups or acrylate groups; and a photochromic dye; and polymerizing the tie coating layer and the photochromic matrix layer composition to prepare a photochromic polycarbonate lens.