Adhesive composition for polarizing film, adhesive layer for polarizing film, polarizing film with adhesive layer, and image display device

A technology of adhesive layer and polarizing film, which is applied in the direction of film/sheet adhesive, non-polymer adhesive additives, adhesive additives, etc., can solve the problem of not being able to fundamentally prevent static electricity generation, white unevenness, etc. , bad conditions and other problems, achieve excellent anti-static function and durability, suppress white unevenness, and meet the effect of durability

Active Publication Date: 2020-07-24
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The static electricity generated in this way affects the orientation of the liquid crystal inside the liquid crystal display device, resulting in a malfunction
For example, when white unevenness occurs when displaying black due to static electricity when using a liquid crystal display device, the phenomenon that the white unevenness does not disappear for several minutes occurs, and there is a problem that image display characteristics deteriorate.
In addition, even after actually installing on a TV, etc., the same white unevenness may sometimes occur due to static electricity generated when the backlight and the polarizer are rubbed against each other.
[0004] The generation of static electricity can be suppressed, for example, by forming an antistatic layer on the outer surface of the polarizing film, but the effect is weak, and there is a problem that the generation of static electricity cannot be fundamentally prevented.

Method used

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  • Adhesive composition for polarizing film, adhesive layer for polarizing film, polarizing film with adhesive layer, and image display device

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0158] Production Example 1 (Preparation of Acrylic Polymer (A-1))

[0159] A monomer mixture containing 99 parts of butyl acrylate and 1 part of 4-hydroxybutyl acrylate was charged into a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen introduction tube, and a condenser. Furthermore, 0.1 part of 2,2'-azobisisobutyronitrile as a polymerization initiator was added with ethyl acetate to 100 parts of the above-mentioned monomer mixture (solid content), and nitrogen gas was introduced while slowly stirring. After substitution, the liquid temperature in the flask was maintained at around 60° C., and a polymerization reaction was performed for 7 hours. Then, ethyl acetate was added to the obtained reaction liquid, and the solid content concentration was adjusted to 30%, and the solution of the acrylic polymer (A-1) whose weight average molecular weight was 1.4 million was prepared.

[0160] The weight average molecular weight of the obtained (meth)acryli...

manufacture example 2

[0172] Production example 2 (production of thin polarizing film)

[0173] In order to produce a thin polarizing layer, first, a laminate with a 9 μm thick PVA layer formed on an amorphous PET substrate was assisted in stretching in an atmosphere at a stretching temperature of 130°C to form a stretched laminate, and then , by dyeing the stretched laminated body to make a colored laminated body, and then stretching the colored laminated body in boric acid water at a stretching temperature of 65 ° C, so that the total stretching ratio is 5.94 times, and a non-woven fabric is made. An optical film laminate including a 4 μm thick PVA layer integrally stretched from a crystalline PET substrate. Through such two-step stretching, the PVA molecules formed on the PVA layer of the amorphous PET substrate are highly oriented, and an optical film laminate including a PVA layer with a thickness of 4 μm can be produced. A highly functional polarizing layer in which iodine adsorbed for dyein...

Embodiment 1

[0175] (Preparation of Adhesive Composition)

[0176] With respect to 100 parts of solid content of the acrylic polymer (A-1) solution obtained in Production Example 1, mix as - Ethylmethylpyrrolidine of the anionic salt (B1) -0.7 parts of bis(trifluoromethanesulfonyl)imide salt (manufactured by Tokyo Chemical Industry Co., Ltd.), lithium bis(trifluoromethanesulfonyl)imide (manufactured by Mitsubishi Materials Electronic Chemicals) as alkali metal salt (B2) 1 Parts, further blending 0.095 parts of trimethylolpropane xylylene diisocyanate (trade name: Takenate D110N, manufactured by Mitsui Chemicals Co., Ltd.) and dibenzoyl peroxide (trade name: NYPER BMT40SV, manufactured by NOF Corporation) 0.3 part, alkoxysilyl resin containing a methyl group and a mercapto group as a thiol-based silane coupling agent (C1) (trade name: X-41-1810, Shin-Etsu Chemical Co., Ltd. Co., Ltd.) 0.2 parts, 0.2 parts of an acetoacetyl group-containing silane coupling agent (trade name: A-100, manuf...

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Abstract

The object of the present invention is to provide an adhesive composition for polarizing films, which can make white unevenness disappear in a short time even when severe static electricity is generated, and can be used in the heating and humidification test under severe conditions. Finally, the durability is satisfied, and an adhesive layer having an excellent appearance can be formed. In addition, the object of the present invention is to provide an adhesive layer formed from the above adhesive composition, a polarizing film with an adhesive layer using the adhesive layer, and a polarizing film with an adhesive layer using the adhesive layer. Image display device with polarizing film. The above-mentioned adhesive composition for a polarizing film contains a (meth)acrylic polymer (A), an anion salt (B1), and an alkali metal salt (B2). A) 100 parts by weight, containing 0.4-3.5 parts by weight of the above-mentioned alkali metal salt (B2), and the weight ratio (B2/B1) of the above-mentioned alkali metal salt (B2) to -anion salt (B1) is 1.2-4.

Description

technical field [0001] The present invention relates to an adhesive composition for a polarizing film, an adhesive layer for a polarizing film formed from the adhesive composition for a polarizing film, and a product with an adhesive layer using the adhesive layer for a polarizing film Polarizing film. In addition, the present invention also relates to image display devices such as liquid crystal display devices, organic EL display devices, and PDPs using the above-mentioned polarizing film with an adhesive layer. Background technique [0002] For liquid crystal display devices and the like, depending on the image forming method, polarizing elements must be arranged on both sides of the liquid crystal cell, and polarizing films are usually attached. When affixing the said polarizing film to a liquid crystal cell, in order to reduce light loss normally, each material is adhere|attached using an adhesive agent. In such a case, there is an advantage that there is no need for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/00C09J7/20C09J7/30C09J11/06G02B5/30
CPCC09J11/06C09J133/00G02B5/30C09J7/20
Inventor 森本有外山雄祐藤田昌邦
Owner NITTO DENKO CORP
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