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Polarizing plate, optical member, and liquid crystal display device

A polarizing plate and polarizing film technology, which is applied in the field of optical components and liquid crystal display devices, can solve the problems of limited thinness and light weight, and achieve the effect of improving mechanical strength, hardness, and good adhesion

Active Publication Date: 2010-12-29
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in a polarizing plate bonded with a TAC film as a protective layer, it is difficult to reduce the thickness of the protective

Method used

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  • Polarizing plate, optical member, and liquid crystal display device
  • Polarizing plate, optical member, and liquid crystal display device
  • Polarizing plate, optical member, and liquid crystal display device

Examples

Experimental program
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Effect test

manufacture example 1

[0164] (Manufacturing example 1: Production of polarizing film)

[0165]After immersing a polyvinyl alcohol film with an average degree of polymerization of about 2400, a saponification degree of 99.9 mol% or more, and a thickness of 75 μm in pure water at 30°C, the weight ratio of iodine / potassium iodide / water at 30°C is 0.02 / 2 / 100 Dip in aqueous solution. After that, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 12 / 5 / 100 at 56.5°C. Next, after washing with 8° C. pure water, it was dried at 65° C. to obtain a polarizing film (thickness 30 μm) in which iodine was adsorbed on polyvinyl alcohol and iodine was oriented. Stretching is mainly carried out in the process of iodine dyeing and boric acid treatment, and the total stretching ratio is 5.3 times.

manufacture example 2

[0166] (Manufacturing Example 2: Preparation of Curable Resin Composition I)

[0167] The following components were mixed to obtain curable resin composition I.

[0168] ◆3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate (manufactured by Daicel Chemical Co., Ltd., Ceroxide 2021P): 35 parts

[0169] ◆Bis(3-ethyl-3-oxetanylmethyl) ether (manufactured by Toagosei Co., Ltd., ARON OXETANE OXT-221): 15 parts

[0170] ◆Tricyclodecane dimethanol diacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., A-DCP): 50 parts

[0171] ◆2-Hydroxy-2-methyl-1-phenylpropan-1-one (manufactured by Ciba Specialty Chemicals Co., Ltd., DAROCURE 1173, radical polymerization photoinitiator): 2.5 parts

[0172] ◆4,4'-bis[diphenylsulfonium]diphenylsulfide bishexafluorophosphate cationic polymerization photoinitiator (Adeka Optomer SP-150 manufactured by Adeka): 2.5 parts

[0173] ◆Silicone-based leveling agent (manufactured by Dow Corning Toray, SH710): 0.2 parts

[0174] In addition, the...

manufacture example 3

[0176] (Manufacturing example 3: Preparation of curable resin composition II)

[0177] The following components were mixed to obtain curable resin composition II.

[0178] ◆3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate (manufactured by Daicel Chemical Co., Ltd., Ceroxide 2021P): 35 parts

[0179] ◆Bis(3-ethyl-3-oxetanylmethyl) ether (manufactured by Toagosei Co., Ltd., ARON OXETANE OXT-221): 15 parts

[0180] ◆Diacrylate ester of acetal compound of hydroxypivalaldehyde and trimethylolpropane (manufactured by Shin-Nakamura Chemical Industry Co., Ltd., A-DOG): 50 parts

[0181] ◆2-Hydroxy-2-methyl-1-phenylpropan-1-one (manufactured by Ciba Specialty Chemicals Co., Ltd., DAROCURE 1173, radical polymerization photoinitiator): 2.5 parts

[0182] ◆4,4'-bis[diphenylsulfonium]diphenylsulfide bishexafluorophosphate cationic polymerization photoinitiator (Adeka Optomer SP-150 manufactured by Adeka): 2.5 parts

[0183] ◆Silicone-based leveling agent (manufactured by Dow Co...

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Abstract

Disclosed is a polarizing plate comprising a polarizing film wherein a dichroic dye is adsorbed and oriented on a polyvinyl alcohol resin film, and a protective layer formed on at least one side of the polarizing film and composed of a cured product of a curable resin composition containing an active energy ray-curable compound. The active energy ray-curable compound contains a compound having atleast one epoxy group in a molecule and a (meth)acrylic compound having at least one (meth)acryloyloxy group in a molecule. The protective layer has an elastic modulus of 3,300-10,000 MPa. The polarizing plate is made thinner and more lightweight, while maintaining good adhesion between the polarizing film and the protective layer and being improved in hardness of the protective layer. Also disclosed are an optical member and a liquid crystal display device, each using the polarizing plate.

Description

technical field [0001] The present invention relates to a polarizing plate having a protective layer on one or both surfaces of a polarizing film. Moreover, this invention also relates to the optical member and liquid crystal display device which used this polarizing plate. Background technique [0002] The polarizing plate is useful as an optical component constituting a liquid crystal display device. Conventionally, as a polarizing plate, a protective layer formed of a transparent resin film is laminated on one or both surfaces of a polarizing film using a water-based adhesive or the like. As the transparent resin film, a triacetyl cellulose film (TAC film) is often used from the viewpoint of being excellent in optical transparency and moisture permeability. The polarizing plate is bonded to the liquid crystal cell with an adhesive through other optical functional layers as needed, and assembled into a liquid crystal display device. [0003] In recent years, with the ex...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02F1/1335
CPCG02F1/133528G02B5/3033
Inventor 藤长将司张柱烈竹厚流
Owner SUMITOMO CHEM CO LTD
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