Patent ID: 8936363
Filing Date: 2015-01-20
Classification: B29C,B29D,B29K,B29L,G02B,G02C

Abstract:
1. A method for producing a polarizing lens, the method comprising: (a) bending a polarizing sheet onto a spherical or aspherical surface, wherein the polarizing sheet comprises (i) a polarizing film and (ii) two aromatic polycarbonate sheets comprising a first aromatic polycarbonate, wherein a first of the two aromatic polycarbonate sheets is bonded via an adhesive layer to a first surface of the polarizing film, and a second of the two aromatic polycarbonate sheets is bonded via an adhesive layer to a second surface of the polarizing film, wherein a viscosity-average molecular weight of the first and/or second aromatic polycarbonates is from 12,000 to 40,000; (b) injecting a second aromatic polycarbonate onto one surface of the bent polarizing sheet; and then (c) heat treating the bent polarizing sheet at a temperature in a range from 15° C. less than to 40° C. less than a glass transition temperature of the first aromatic polycarbonate; to obtain a polarizing lens, wherein: wherein when a heat treatment temperature, in ° C., is X and a heat treatment time, in hours, is Y, and X is in a range from 115° C. to 135° C., a relationship between the heat treatment temperature and heat treatment time satisfies Formula 1, and an anisotropy of base curves in the horizontal direction and in the vertical direction of the polarizing lens after the heat treating is not more than 0.25, and a retardation value of the aromatic polycarbonate sheet disposed on an opposite surface to the surface where the second aromatic polycarbonate was injected is in a range from 2000 nm to 20000 nm.