Colored low polarizing film, colored low polarizing plate and lens, and their manufacturing method

Abstract

The present invention provides a colored low-polarizing film with little change in color tone and transmittance during the processing process and in which the color tone can be selected more freely, a method for producing the film, a low-polarizing sheet including the film, and molding the sheet A polarizing lens made of. A polarizing film obtained by water-swelling a polyvinyl alcohol-based resin film, uniaxially stretching it, dyeing it with a dichroic organic dye, and drying it; A polarizer obtained by combining an aromatic polycarbonate sheet; bending the polarizer into a spherical or aspherical curved polarizing lens or bending the polarizer into a spherical or aspherical surface and injection molding aromatic polycarbonate on its concave surface In the obtained injection polarizing lens, as the above-mentioned dichroic organic dye used in the production of the above-mentioned polarizing film, a combination of dichroic organic dyes having a dichroic ratio of 13 or more is used, and the degree of polarization is 30% or more and less than 90%. A dichroic organic dye composition in an amount maintaining polarization; and an amount composed of a combination of dyes having an extremely low dichroic ratio of 4 or less or substantially no dichroic ratio, dyed into a desired color Organic dye composition for coloring. The degree of polarization of the colored low-polarizing film of a desired color is 45% to 90%.

Description

technical field [0001] The present invention relates to a coloring that exhibits adjusted total light transmittance and adjusted low polarization degree as sunglasses, can select a wider range of color tones, and has little change in color tone and transmittance in the process of processing into sunglasses, etc. Low polarizing films, tinted low polarizing sheets and lenses, and methods for their manufacture. Background technique [0002] Typically, a polarizing plate is used in which iodine or a dichroic organic dye is adsorbed or impregnated into a uniaxially stretched polyvinyl alcohol (PVA) film (hereinafter, appropriately referred to as a PVA polarizing film). The polarizing film usually uses a transparent resin such as triacetyl cellulose as a protective layer on one side (or both sides), which is easy to handle and suitable for secondary processing, and can be made into a cheap and lightweight polarizing plate. [0003] On both sides of a polarizing film obtained by s...

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Problems solved by technology

[0005] However, since the photoelastic constant of aromatic polycarbonate is large, when it is bent to form a spherical or aspherical surface shape such as sunglasses or goggles, colored interference fringes caused by hysteresis are likely to occur, and there are colored interference fringes. Streaks impair appearance, cause eye fatigue, etc.

[0006] In addition, in the polarizing lens obtained by bending the polarizer into a spherical or aspheric surface shape, the uneven thickness of the aromatic polycarbonate polarizer causes image distortion, damages the appearance, and causes eye fatigue. question

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