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polarizing plate

A polarizing plate and compound technology, applied in polarizing elements, instruments, optical elements, etc., can solve the problems of unsuitable protective film and polarizer bonding, hinder curing, high alkalinity, and achieve excellent curability, improved optical properties, The effect of reducing quality deterioration

Active Publication Date: 2017-05-24
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the urethane resin used in the above-mentioned primer has a high alkalinity and hinders curing when a cationic polymer type adhesive is used, so it is considered unsuitable for bonding a protective film and a polarizer.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0128] In a reaction vessel equipped with a stirrer, a reflux condenser, a thermometer, a dropping funnel, and a nitrogen gas inlet, bisphenol F-type glycidyl ether ("EPICLON EXA-830CRP" manufactured by DIC Corporation) as a cationic polymerizable compound was charged. ) 100 parts by mass, two [1-ethyl (3-oxetanyl)] methyl ether 350 parts by mass, 3,4-epoxycyclohexyl carboxylic acid 3,4-epoxycyclohexenyl methyl 250 parts by mass of ester, 300 parts by mass of trimethylolpropane diglycidyl ether, 50 parts by mass of propylene carbonate of diphenyl-4-(phenylthio)phenylsulfonium hexafluorophosphate as a cationic polymerization initiator 80 parts by mass of the solution, 40 parts by mass of 2,4-diethylthioxanthone as a thioxanthone compound, and 10 parts by mass of 1,4-diethoxynaphthalene as a naphthalene compound were mixed and stirred, Thus, a cationically polymerizable adhesive (Y-1) was obtained.

[0129] Prepare 2 sheets of UV-TAC with a urethane primer layer obtained in the...

Embodiment 2～10、 comparative example 1～3

[0131] Except having changed the quantity of the thioxanthone compound and naphthalene compound used, and the kind of protective film as shown in Tables 1-2, it carried out similarly to Example 1, and obtained the polarizing plate.

Embodiment 11

[0133] Change the usage amount of two [1-ethyl (3-oxetanyl)] methyl ether to 300 parts by mass, and 3,4-epoxycyclohexene carboxylic acid 3,4-epoxycyclohexene Except having changed the usage-amount of a methyl ester into 300 mass parts, it carried out similarly to Example 1, and obtained the polarizing plate.

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Abstract

The problem to be solved by the present invention is to provide a polarizing plate using a cationically polymerizable adhesive that is excellent in curability even when a protective film having a urethane primer layer is used. The present invention provides a polarizing plate characterized in that the protective film having a urethane primer layer and the polarizer are bonded by a cationically polymerizable compound containing a cationically polymerizable compound, a cationic polymerization initiator, a thioxanthone compound, and a naphthalene compound. Adhesive for bonding. Since the polarizing plate of the present invention has excellent curability even when a protective film having a urethane primer layer and a cationic polymerizable adhesive are used, it can contribute to further improvement of optical characteristics.

Description

technical field [0001] The present invention relates to polarizing plates used in liquid crystal displays and the like, for example. Background technique [0002] As a protective film constituting a polarizing plate, a triacetyl cellulose (TAC) film and a cycloolefin polymer (COP) film have been widely used conventionally. However, in recent years, in order to improve the optical functions such as viewing angle compensation and further improve the adhesion between the protective film and the polarizer, the use of a protective film coated with a urethane primer is beginning to be studied (for example, refer to Patent Document 1 .). [0003] On the other hand, various studies are under way to use a cationic polymerizable adhesive that is easily cured by energy rays such as ultraviolet rays for bonding a protective film and a polarizing plate. [0004] However, the urethane resin used for the above-mentioned primer has a high basicity and inhibits curing when a cationic polym...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30C09J11/06C09J201/02C09J163/00
CPCG02B1/04G02B5/3033C08L63/00G02B1/105C09J163/00G02B1/14C09J11/06C09J201/02G02B5/305
Inventor 山本辰弥田中浩二郎桥口恒则
Owner DIC CORP
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