Colored polarizing film, colored polarizing sheet, colored polarizing lens and methods for producing them

摘要

[Problem to be solved] A polarizing film for sunglasses having a color that can be more freely selected and that shows smaller changes in color tone and a colored polarizing sheet using the film and a colored polarizing lens using the polarizing sheet are provided. [Solution] A polarizing film that is produced by swelling a polyvinyl alcohol film with water, uniaxially stretching it, dyeing it with an organic dichroic dye, and drying it, wherein the dichroic organic dye is made by using a dichroic organic dye composition and a coloration organic dye composition, wherein the dichroic organic dye composition comprises a combination of organic dyes having a dichroic ratio of 13 or higher used in an amount to keep the degree of polarization at 90% or more, and wherein the coloration dye composition comprises a combination of dyes having extremely low dichroic ratios of 4 or less or substantially having no dichroic ratio, laminating at least one layer of a transparent plastic sheet onto at least both sides of the polarizing film, which is obtained by using an amount of coloration organic dye composition to yield the desired color, to obtain a polarizing sheet; curving the polarizing sheet so as to impart spherical or aspherical surfaces thereto to obtain a polarizing lens or curving the polarizing sheet so as to impart spherical or aspherical surfaces thereto and injecting a transparent resin to the concave surface of the curved polarizing sheet to obtain an injection polarizing lens, wherein the transparent resin is an aromatic polycarbonate, wherein the surface of the one side of the polarizing sheet is an aromatic polycarbonate and that side is curved to make the concave surface.