Patent ID: 8496859
Filing Date: 2013-07-30
Classification: B29D,Y10T

Abstract:
1. A method of producing a plastic polarized lens, comprising: fixing a polarized film comprised of a thermoplastic polyester in a lens-forming mold in a state separated from an inner wall of said mold; injecting a mixture in which the viscosity at 20° C. is 200 mPa·s or less into a space between both surfaces of said polarized film and said inner wall of said mold; and stacking layers comprised of a thiourethane resin on both surfaces of said polarized film by polymerizing and curing said mixture, wherein said mixture containing contains: (A) at least one kind of diisocyanate selected from the group consisting of 2,5-bis(isocvanatomethyl)bicyclo[2.2.1]heptane, 2,6-bis(isocyanatomethyl)bicyclo[2.2.1]heptane and m-xylylene diisocyanate, and (B) at least one kind of polythiol compound selected from the group consisting of pentaerythritoltetrakis(3-mercaptopropionate), 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 1,1,3,3-tetrakis(mercaptomethylthio)propane, 4,6-bis(mercaptomethylthio)-1,3-dithiane and 2-(2,2-bis(mercapto methylthio)ethyl)-1,3-dithietane, wherein the narrowest distance of said space is 0.2 to 2.0 mm.