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Polarizing plate and liquid crystal display device

A polarizer and polarizing film technology, applied in polarizing components, instruments, optics, etc., can solve problems such as insufficient ultraviolet absorption performance, and achieve excellent ultraviolet absorption performance, excellent durability, and excellent environmental resistance.

Active Publication Date: 2013-12-11
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, for optical films used in polarizers, for the purpose of preventing ultraviolet rays from deteriorating liquid crystals and polarizing films, ultraviolet absorption performance is sometimes required, and the usual polyethylene terephthalate film is used as a protective film for polarizers. , sometimes the UV absorbing performance is not sufficient

Method used

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  • Polarizing plate and liquid crystal display device
  • Polarizing plate and liquid crystal display device
  • Polarizing plate and liquid crystal display device

Examples

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Embodiment

[0205] Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples. In addition, the % and the part which show content or usage-amount in these examples are based on weight unless otherwise indicated. The evaluation was performed as follows.

[0206]

[0207] About the protective film laminated|stacked on the polarizing film, the light transmittance of 320mn and 380mn was measured using the spectrophotometer UV2450 by Shimadzu Corporation.

[0208]

[0209] The obtained polarizing plate was cut into 40 mm×40 mm, and was bonded to a glass substrate via an adhesive on the outer surface of the protective film laminated on the opposite side to the stretched polyethylene terephthalate film. Then, Sunshine Weather Meter (S80 by Suga Test Instruments Co., Ltd.) was put in so that the stretched polyethylene terephthalate film was irradiated with ultraviolet rays. After 500 hours of irradiation...

manufacture example 1

[0214] [Production Example 1] Production of polarizing film

[0215] A polyvinyl alcohol film having an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol% or more, and a thickness of 75 μm was immersed in pure water at 30°C, and then immersed in iodine / potassium iodide / pure water at a weight ratio of 0.02 / 2 / 100 at 30°C. in aqueous solution. Then, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / pure water of 12 / 5 / 100 at 56.5°C, followed by washing with pure water at 8°C, and drying at 65°C to obtain iodine-adsorbed and oriented polymers. Polarizing film for vinyl alcohol. The stretching was mainly performed in the steps of iodine dyeing and boric acid treatment, and the total stretching ratio in the steps was 5.3 times.

manufacture example 2

[0216] [Production Example 2] Production of UV-curable Adhesive Composition

[0217] The following components were mixed to prepare a liquid adhesive composition.

[0218] 3,4-Epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate 40 parts

[0219] Bisphenol A epoxy resin 60 parts

[0220] Diphenyl[4-(phenylthio)phenyl]thio Hexafluoroantimonate (cationic polymerization initiator)

[0221] 4.0 servings

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Abstract

The present invention provides a polarizing plate formed by laminating protective films respectively on both surfaces of a polarizing film comprising a polyvinyl alcohol resin with adhesive layers lying respectively therebetween. The protective film on one of the surfaces is a stretched polyethylene terephthalate film that contains an ultraviolet-absorbing agent and that exhibits a light transmittance of 10% or less at a wavelength of 380nm, while the protective film on the other thereof exhibits a light transmittance of 60% or more at a wavelength of 320nm. Further, each adhesive layer comprises a cured product of an ultraviolet-curable resin composition that contains an epoxy compound. The polarizing plate exhibits excellent ultraviolet absorbance, excellent tight adhesion between the polarizing film and the protective films, high wet-heat resistance, and high productivity, with no damage to the surface appearance.

Description

technical field [0001] The present invention relates to a polarizing plate and a liquid crystal display device using the same. Background technique [0002] In recent years, light-weight and thin liquid crystal display devices that consume less power, operate at low voltages, and are light-weight and thin have rapidly spread as information display devices such as cell phones, portable information terminals, monitors for computers, and televisions. In addition, with the development of liquid crystal technology, liquid crystal display devices of various modes have been proposed, and problems such as response speed, contrast ratio, and viewing angle, which were problems of liquid crystal display devices in the past, are gradually disappearing. [0003] On the other hand, in response to strong market demands for further thinning and weight reduction of liquid crystal display devices, the liquid crystal panels, diffusers, backlight units, and driver ICs constituting the liquid cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02B5/208G02B5/3025G02F2201/086G02F2202/28G02B1/04G02B5/30G02F1/1335
Inventor 矢可部公彦松久英树
Owner SUMITOMO CHEM CO LTD
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