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Composite polarizing plate and liquid crystal display device

A composite polarizer and polarizer technology, applied in polarizing elements, optics, instruments, etc., can solve problems such as warpage of glass substrates, and achieve the effect of suppressing warpage

Active Publication Date: 2014-02-05
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, in the case of the composite polarizing plate as described above, it is bonded to the glass substrate through the first pressure-sensitive adhesive layer. However, when the composite polarizing plate shrinks under high temperature and high humidity, it may Warpage occurs in thinned glass substrates

Method used

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  • Composite polarizing plate and liquid crystal display device
  • Composite polarizing plate and liquid crystal display device
  • Composite polarizing plate and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0130] (Preparation of Pressure Sensitive Adhesive C)

[0131] Based on the solid content, butyl acrylate (BA), methyl acrylate (MA), 2-phenoxyethyl acrylate (PEA), 2-hydroxyethyl acrylate (HEA) and acrylic acid (AA) were 69 :20:9:1:1 weight ratio polymerization to obtain an acrylic resin with a weight average molecular weight of 1.5 million. Then, 0.5 parts by weight of an adduct of 100 parts by weight of the acrylic resin and toluene diisocyanate (trade name: Coronate L, manufactured by Nippon Polyurethane Industries Co., Ltd.) as a crosslinking agent, 2 parts by weight of an antistatic agent, and silane Compound (trade name: KBM-403, manufactured by Shin-Etsu Chemical Co., Ltd.) was mixed in an amount of 0.3 parts by weight. Then, this mixture was diluted with methyl ethyl ketone (MEK) so that the density|concentration might become 15 %, and the adhesive composition (pressure-sensitive adhesive C) was obtained.

[0132] (Preparation of Pressure Sensitive Adhesive A)

[0...

Embodiment 2

[0152] (Preparation of Pressure Sensitive Adhesive D)

[0153] 3 parts by weight of an adduct of 100 parts by weight of the acrylic resin (1) used in Example 1 and toluene diisocyanate (trade name: Coronate L, manufactured by Nippon Polyurethane Industries Co., Ltd.) as a crosslinking agent and a silane compound (Trade name: KBM-403, manufactured by Shin-Etsu Chemical Co., Ltd.) 0.3 parts by weight were mixed and diluted with methyl ethyl ketone so that the concentration would be 15%, to obtain an adhesive composition (pressure-sensitive adhesive D).

[0154] A composite polarizing plate was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive D was used instead of the pressure-sensitive adhesive A used in Example 1. Then, using the same test method as in Example 1 for this composite polarizing plate, the dimensional change (shrinkage) of the transparent plastic substrate was measured. As a result, the dimensional change (shrinkage) of the lo...

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Abstract

This composite polarizing plate has, laminated in this order, a first pressure-sensitive adhesive layer, polarizing plate, second pressure-sensitive adhesive layer, and transparent plastic substrate. The polarizing plate has a polarizing film and transparent protective film that is in contact with the second pressure-sensitive adhesive layer. The storage elastic modulus at 80°C for the first pressure-sensitive adhesive layer is 10 - 100 KPa. The storage elastic modulus at 80°C for the second pressure sensitive adhesive layer is 0.1 - 60 KPa. An anti-static layer is preferably laminated on the surface of the transparent plastic substrate on the opposite side from the second pressure-sensitive adhesive layer.

Description

technical field [0001] The present invention relates to a composite polarizing plate and a liquid crystal display device using the same. Background technique [0002] As a composite polarizing plate aimed at thinning, a composite polarizer in which a first pressure-sensitive adhesive layer, a polarizing element (polarizing film), a second pressure-sensitive adhesive layer, and a transparent plastic substrate are sequentially laminated has been proposed. polarizer. In this composite polarizing plate, the polarizing element and the transparent plastic substrate are directly laminated through the second pressure-sensitive adhesive layer. A pressure-sensitive adhesive layer with a storage modulus of ~1 MPa (JP2010-39458-A). [0003] In general, polarizing films tend to shrink under high temperature and high humidity. In the composite polarizer, a pressure-sensitive adhesive with a high storage modulus is used as the second pressure-sensitive adhesive layer to bond the polarizi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02B5/3033B32B7/12G02B5/30G02F1/1335
Inventor 玄劤植松野健次
Owner SUMITOMO CHEM CO LTD
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