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Uniaxially stretched multi-layer laminate film, polarizing plate comprising same, optical member for liquid crystal display device, and liquid crystal display device

一种液晶显示装置、单轴拉伸的技术，应用在光学元件、偏振元件、光学等方向，能够解决反射偏振器与吸收元件粘接力降低等问题，达到优异耐久性、对比度高、高耐久性的效果

Inactive Publication Date: 2015-05-20
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in such a mixed polarizer solution, there is a concern that the adhesion between the reflective polarizer and the absorbing element will be reduced

Method used

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  • Uniaxially stretched multi-layer laminate film, polarizing plate comprising same, optical member for liquid crystal display device, and liquid crystal display device
  • Uniaxially stretched multi-layer laminate film, polarizing plate comprising same, optical member for liquid crystal display device, and liquid crystal display device
  • Uniaxially stretched multi-layer laminate film, polarizing plate comprising same, optical member for liquid crystal display device, and liquid crystal display device

Examples

Experimental program
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Effect test

preparation example Construction

[0147] Due to the relationship between the preparation method of the above-mentioned intermediate layer, the outermost layer of the uniaxially stretched multilayer laminated film becomes the buffer layer, and the multiple reflection absorption effect produced by the intermediate layer is passed through the intermediate layer arranged inside the multilayer structure. Contains visible light absorbers for effect. That is, even if only the visible light absorber is contained in the outermost layer of the multilayer structure, the transmittance of P-polarized light and the transmittance of S-polarized light decrease in the same ratio, so the value of the degree of polarization (P) does not change. Therefore, in the production of a multilayer laminated film, a layer of the same composition can be arranged in the outermost layer of the multilayer structure together with the intermediate layer of the present invention, but in this case, the degree of polarization will not be further in...

Embodiment 1

[0339] Esterification and transesterification of dimethyl 2,6-naphthalene dicarboxylate, 6,6'-(ethylenedioxy)di-2-naphthoic acid and ethylene glycol in the presence of titanium tetrabutoxide reaction, and then continue to carry out the polycondensation reaction, the intrinsic viscosity is 0.62dl / g and 65 mol% of the acid component is 2,6-naphthalene dicarboxylic acid component (represented as PEN in the table), and 35 mol% of the acid component is 6,6 '-(Ethylenedioxy)di-2-naphthoic acid component (represented as ENA in the table) and an aromatic polyester whose diol component is ethylene glycol were used as the polyester for the first layer, and an intrinsic viscosity (o- A polyethylene terephthalate (IA20PET) in which 20 mol% of isophthalic acid was copolymerized with 0.62 dl / g of chlorophenol, 35° C. was used as the polyester for the second layer.

[0340] To the prepared polyester for the first layer, 0.12% by weight (1200 ppm) of carbon black (manufactured by EVONIK INDUS...

Embodiment 2~12

[0351] As shown in Table 1, except that the resin composition of each layer, the type of visible light absorber and ultraviolet absorber, the amount added, the thickness of the layer, the number of multiplications, and the preparation conditions were changed, the uniaxial tensile strength was obtained in the same manner as in Example 1. A multi-layer laminated film is stretched, and this film is used as a first polarizing plate to form a liquid crystal panel to prepare a liquid crystal display.

[0352] It should be noted that the NDC20PET used as the polyester for the second layer in Example 2 is polyethylene terephthalate obtained by copolymerizing 20 mol% of isophthalic acid used as the polyester for the second layer in Example 1. The copolymerization component of the glycol ester (IA20PET) was changed to a copolyester of 2,6-naphthalene dicarboxylic acid. Similarly, the polyester for the second layer in Example 3 was 2,6-naphthalene dicarboxylic acid whose copolymerization ...

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Abstract

A uniaxially stretched multi-layer laminate film that exhibits a high polarization performance of 99.5% or more in a simpler configuration than before, a polarizing plate that is composed of the same, an optical member for a liquid crystal display device, and a liquid crystal display device are provided. Namely, in the uniaxially stretched multi-layer laminate film in which a first layer and a second layer are alternately laminated, the uniaxially stretched multi-layer laminate film includes an intermediate layer that has a thickness of 2 μm or more and 30 μm or less; the first layer is composed of a polyester containing a naphthalene dicarboxylic acid ester; the second layer is composed of a copolymer polyester and is an optically isotropic layer that has an average refractive index of 1.50 or more and 1.60 or less; the first layer, the second layer, both first and second layers, or the intermediate layer contains a visible light absorbent, which has a weight loss of less than 10% when it is kept at 300° C. for 1 hour, in an amount of 200 ppm or more and 2500 ppm or less on the basis of the weight of the layer; the uniaxially stretched multi-layer laminate film has a polarization degree of 99.5 or more; and the average transmittance Ts for S-polarized light in a wavelength range of 400 nm to 800 nm is 60% or more.

Description

technical field [0001] The present invention relates to a uniaxially stretched multilayer laminated film, a polarizing plate including the same, an optical member for a liquid crystal display device, and a liquid crystal display device, and more specifically relates to a uniaxially stretched multilayer laminated film that can be compared to Conventionally, a uniaxially stretched multilayer laminated film exhibiting high polarization performance comparable to an absorbing polarizing plate, a polarizing plate including the same, an optical member for a liquid crystal display device, and a liquid crystal display device are constructed simply. Background technique [0002] In liquid crystal display devices (LCD) used in televisions, personal computers, mobile phones, etc., the transmission amount of light emitted from a light source can be adjusted by a liquid crystal panel with polarizing plates arranged on both sides of a liquid crystal element (cell), thereby enabling to disp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B32B7/02B32B27/18B32B27/36C08G63/187C08G63/199G02F1/1335
CPCG02B5/3083G02F1/133536G02F2201/086B32B27/36C08G63/199B32B27/20B32B2264/108B32B2307/516C08G63/189B32B27/08B32B2307/42B32B2457/202C09K2323/031C09K2323/03B32B7/02B32B27/18C08G63/187G02F1/1335B32B2250/05B32B2367/00G02B1/04G02B5/208G02B5/3025G02F1/1336G02B5/305
Inventor 大宅太郎田名部佳那中广贵吉田哲男城间裕美清水智子
Owner TEIJIN LTD
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