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Polarizing plate

A polarizing plate and polarizing film technology, applied in the direction of polarizing elements, can solve the problems of reduced polarization performance, and achieve the effect of excellent polarization performance and excellent resistance to heat and humidity

Active Publication Date: 2019-04-16
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polarizing performance may decrease when used under high-temperature and high-humidity conditions, and a polarizing plate with excellent heat and humidity resistance is required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0141] (production of polarizing film)

[0142] When using 100 parts by mass of PVA (a saponified product of a copolymer of vinyl acetate and ethylene, with an average degree of polymerization of 2400, a degree of saponification of 99.4 mol%, and a content of ethylene units of 2.5 mol%), glycerin as a plasticizer A PVA film with a thickness of 30 μm obtained by casting a film-forming stock solution of 10 parts by mass, 0.1 parts by mass of polyoxyethylene lauryl ether sodium sulfate as a surfactant, and water was subjected to a swelling process, a dyeing process, and a cross-linking process. , a stretching process, a fixing treatment process, and a drying process, whereby a polarizing film is produced.

[0143] That is, the above-mentioned PVA film was immersed in water at a temperature of 30°C for 1 minute, and uniaxially stretched (first-stage stretching) in the longitudinal direction (MD) to twice the original length, and then used as an amount of Iodine at a concentration...

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Abstract

Provided is a polarizing plate formed by laminating a polarizing film layer and a cured product layer formed of a resin composition, wherein the polarizing plate is characterized in that: the thickness of the cured product layer is 10 [mu]m or less; the boric acid permeation in terms of boron atoms is 2.25 g / m2*day or less; and the cured product layer is disposed directly adjacent to at least onesurface of the polarizing film layer. Due to this configuration, provided is a polarizing plate that has excellent resistance to heat and humidity and that can maintain an initial polarizing functioneven if the thickness of a cured product layer, which is formed of a resin composition and which is laminated on the polarizing film layer, is 10 [mu]m or less.

Description

technical field [0001] The present invention relates to a thin film and a polarizing plate excellent in moisture and heat resistance. Background technique [0002] Polarizing plates with light-transmitting and light-shielding functions and liquid crystals that change the polarization state of light are both basic components of liquid crystal displays (LCDs). A conventional polarizing plate is produced by laminating a protective film on one or both sides of a polarizing film layer obtained by dyeing and stretching a polyvinyl alcohol film (hereinafter, “polyvinyl alcohol” may be abbreviated as “PVA”). [0003] As the protective film, films such as triacetyl cellulose (TAC) have been widely used conventionally. In recent years, with the application of liquid crystal displays in mobile devices, it is gradually required to reduce the weight of the film. From this point of view, it is proposed to form a photocurable resin combination on the surface of the polarizing film layer i...

Claims

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Application Information

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IPC IPC(8): G02B5/30
CPCG02B5/30
Inventor 冈山沙树川崎绘美风藤修
Owner KURARAY CO LTD