Patent ID: 6441119
Filing Date: 2002-08-27
Classification: C08K,G02B

Abstract:
A method for producing an optical lens, comprising,adding 2-(2-hydroxy-4-octyloxyphenyl)-benzotriazole to a monomer selected from the group consisting of a diethylene glycol bisallylcarbonate monomer and a thiourethane monomer to form a mixture, polymerizing the monomer in the mixture, and forming said optical lens, wherein the optical lens has a yellowness index (YI) between about 0.7 and 1.6 and a 380 nm UV transmittance of at most 30% when the monomer is a diethylene glycol bisallylcarbonate monomer and a thickness of the optical lens is about 2.2 mm, and wherein the optical lens has a yellowness index (YI) between about 0.7 and 1.6 and a 380 nm UV transmittance of at most 30% when the monomer is a thiourethane monomer and a thickness of the optical lens is about 2.2 mm.