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Protection film and polarization plate provided with protection film

A technology of protective film and polarizing plate, which is applied in the direction of optics, optical elements, polarizing elements, etc., can solve the problems of insufficient warpage suppression and dependence on polarizers, and achieve the effects of suppressing warpage, reducing load, and improving manufacturing efficiency

Active Publication Date: 2015-06-03
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are proposals to suppress warping of polarizers by attaching protective films, but depending on the composition of polarizers, suppression of warping may be insufficient

Method used

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  • Protection film and polarization plate provided with protection film
  • Protection film and polarization plate provided with protection film
  • Protection film and polarization plate provided with protection film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] (Preparation of Pressure Sensitive Adhesives)

[0078] In a reaction vessel equipped with a condenser, a nitrogen inlet pipe, a thermometer and a stirrer, 100 parts by weight of butyl acrylate, 5.0 parts by weight of acrylic acid, 0.075 parts by weight of 2-hydroxyethyl acrylate, 0.3 parts by weight of 2,2'-azobisisobutyronitrile, and ethyl acetate. The stirred mixture was reacted at 60° C. for 6 hours under a nitrogen stream to obtain an acrylic polymer solution having a weight average molecular weight of 1,630,000. With respect to 100 parts by weight of the polymer solid content of the acrylic polymer solution, 0.6 parts by weight of an isocyanate-based polyfunctional compound (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name: CORONATE L) and 0.08 parts by weight Parts of a silane coupling agent (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KBM403) to prepare a pressure-sensitive adhesive.

[0079] A pressure-sensitive adhesive was app...

Embodiment 2

[0082] A protective film was prepared in the same manner as in Example 1 except that an adhesive layer was formed with a thickness of 9 μm. The modulus of elasticity of the resulting protective film was 3.7 kN / mm 2 And the tensile elongation was 89%.

Embodiment 3

[0084] A protective film was prepared in the same manner as in Example 1 except that an adhesive layer was formed with a thickness of 3 μm. The modulus of elasticity of the resulting protective film was 3.7 kN / mm 2 And the tensile elongation was 80%.

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Abstract

Provided is a protection film capable of excellently suppressing warpage of a polarization plate. This protection film has a first resin layer (11), an adhesive layer (13), and a second resin layer (12) in this order.

Description

technical field [0001] The present invention relates to a protective film for polarizing plates. Background technique [0002] In a liquid crystal display device, which is a typical image display device, a polarizing plate is attached to each of both sides of a liquid crystal cell based on the image formation method of the liquid crystal display device. From the viewpoint of, for example, improving mechanical durability and optical durability, a polarizing plate is generally constituted by laminating a protective layer on at least one side of a polarizer having polarizing properties. However, the polarizing plate has a problem of being easily warped due to, for example, a difference in coefficient of linear expansion and coefficient of thermal contraction between the polarizer and the protective layer. Such warpage of the polarizer can be eliminated by, for example, attaching the polarizer to the liquid crystal cell, however, the warpage becomes a part of the manufacturing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30
CPCG02B5/3033G02B1/105B32B2307/42B32B2307/54B32B2307/736B32B2457/202B32B7/12B32B27/08B32B27/36B32B2307/51G02B1/14B32B7/06B32B2457/20G02B5/305
Inventor 伊崎章典平井真理子木村启介济木雄二本村弘则
Owner NITTO DENKO CORP
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