Adhesive layer-attached retardation film, and elliptical polarizing plate and liquid crystal display device each utilizing same

A retardation film, adhesive layer technology, applied in polarizing elements, layered products, instruments, etc., can solve the problems of adhesive layer peeling, liquid crystal cell paste residue, operability deterioration, etc., to achieve excellent reusability , excellent adhesion, and the effect of realizing productivity

Inactive Publication Date: 2012-03-28
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, retardation films made of chain polyolefin-based resins such as polypropylene-based resins have a problem of poor adhesion to adhesives compared with retardation films made of cyclic polyolefin-based resins.
Specifically, the phase difference film is usually bonded to the liquid crystal cell through an adhesive layer, but when the phase difference film is peeled off from the liquid crystal

Method used

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  • Adhesive layer-attached retardation film, and elliptical polarizing plate and liquid crystal display device each utilizing same
  • Adhesive layer-attached retardation film, and elliptical polarizing plate and liquid crystal display device each utilizing same
  • Adhesive layer-attached retardation film, and elliptical polarizing plate and liquid crystal display device each utilizing same

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0152] (Production Example 1: Production of retardation film)

[0153] A propylene / ethylene random copolymer containing approximately 5% of ethylene units ("Sumitomo Nippon W151" manufactured by Sumitomo Chemical Co., Ltd.) was formed into a film to obtain a roll film composed of a polypropylene resin having a thickness of 40 μm. By uniaxially stretching the roll film in the transverse direction, a uniaxial retardation film is obtained. For this retardation film, the in-plane retardation value R 0 =90nm, the retardation value R in the thickness direction th =45nm, the thickness is 9μm. Then, a self-adhesive surface protection film manufactured by Toray Film Processing Co., Ltd., which is a brand name "Toretec 7332", was bonded to one side of the retardation film made of polypropylene resin.

Example Embodiment

[0154] [Example 1]

[0155] (a) Preparation of coating liquid for undercoat layer

[0156] A polyester resin (I) with a weight average molecular weight of 35,000 containing structural units derived from neopentyl glycol, ethylene glycol, terephthalic acid, and isophthalic acid was dissolved in toluene: methyl ethyl ketone = 4: In the mixed solvent of 1, a coating liquid for an undercoat layer having a polyester resin (I) concentration of 10% was prepared. The content ratio of the structural unit derived from neopentyl glycol, ethylene glycol, terephthalic acid, and isophthalic acid in the polyester resin (I) is 1:1:1:1 in terms of molar ratio.

[0157] (b) Formation of undercoat layer for retardation film

[0158] On the surface of the retardation film made of polypropylene resin obtained in Production Example 1 on the side opposite to the surface on which the surface protection film was laminated, the cumulative exposure was 15.9 kJ / m 2 Implement corona discharge treatment. Within ...

Example Embodiment

[0161] [Example 2]

[0162] A polyester resin (II) with a weight average molecular weight of 33,000 containing constituent units derived from neopentyl glycol, ethylene glycol, terephthalic acid, isophthalic acid, and 5-sodium isophthalate is dissolved in In the mixed solvent of toluene: methyl ethyl ketone = 1:1, the coating solution for the primer layer having a concentration of 10% of the polyester resin (II) thus obtained was used. Other than that, the same as in the examples 1 In the same manner, an elliptically polarizing plate with an adhesive layer was produced. The content of the constituent units derived from neopentyl glycol, ethylene glycol, terephthalic acid, isophthalic acid, and 5-sodium isophthalate in the polyester resin (II) is calculated as a molar ratio 1:1:1:1:1:0.005.

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Abstract

Disclosed is an adhesive layer-attached retardation film (10), which comprises a retardation film (20) comprising a polypropylene resin, a primer layer (30) laminated on the surface of the retardation film (20), and an adhesive layer (40) laminated on the surface of the primer layer (30), wherein the primer layer (30) comprises a thermoplastic polyester resin composed of diol units and dicarboxylic acid units and having a weight average molecular weight of 10,000 to 150,000, and wherein a unit represented by formula (I) [wherein R represents a methylene group or an ethylene group; and n represents 1 or 0] makes up 40 to 80 mol% of the total amount of the diol units. In the adhesive layer-attached retardation film (10), the adhesion between the retardation film and an adhesive agent is improved. Also disclosed are an elliptical polarizing plate and a liquid crystal display device, each of which utilizes the adhesive layer-attached retardation film.

Description

technical field [0001] The present invention relates to a retardation film, and more specifically, to a retardation film with an adhesive layer in which a specific undercoat layer and an adhesive layer are laminated on a retardation film made of a polypropylene resin. Also, the present invention relates to an elliptically polarizing plate using the retardation film with an adhesive layer, and a liquid crystal display device using the elliptically polarizing plate. Background technique [0002] In recent years, light-weight and thin liquid crystal display devices with low power consumption, low-voltage operation, and information use have rapidly spread as display devices for mobile phones, portable information terminals, computer monitors, and televisions. With the development of such liquid crystal technology, various modes of liquid crystal displays have been proposed, gradually overcoming the conventionally pointed out problems of liquid crystal displays such as response s...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02F1/1335G02F1/13363
CPCG02B5/3033G02B5/3083B32B7/12B32B2307/42C08G63/672G02F1/133541
Inventor 松井诚子黑岩秀夫
Owner SUMITOMO CHEM CO LTD
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