Pressure-sensitive adhesive for optical film, pressure-sensitive adhesive optical film, production method thereof, and image display

A technology of optical film and manufacturing method, applied in the direction of film/sheet-like adhesive, adhesive type, pressure-sensitive film/sheet, etc., can solve the problem of inability to meet durability and other problems, achieve good durability and prevent falling off Effect

Inactive Publication Date: 2009-05-06
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this adhesive composition does not require curing and has good processability, it does not yet satisfy sufficient durability

Method used

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  • Pressure-sensitive adhesive for optical film, pressure-sensitive adhesive optical film, production method thereof, and image display
  • Pressure-sensitive adhesive for optical film, pressure-sensitive adhesive optical film, production method thereof, and image display
  • Pressure-sensitive adhesive for optical film, pressure-sensitive adhesive optical film, production method thereof, and image display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0185]

[0186] In a four-necked flask equipped with a stirring paddle, a thermometer, a nitrogen introduction tube, and a cooler, 95 parts of butyl acrylate, photocrosslinkable monomers (containing cinnamoyl monomers, AR monomers, etc.) , Japan Siberuhegner Co., Ltd.) 5 parts, 0.1 part of 2,2'-azobisisobutyronitrile as a polymerization initiator, and 200 parts of ethyl acetate were slowly stirred while nitrogen gas was introduced, and after nitrogen replacement, the The liquid temperature in the flask was maintained at around 60° C., and a polymerization reaction was performed for 6 hours to prepare an acrylic polymer solution. The weight average molecular weight of the acrylic polymer is 1.63 million.

[0187]

[0188] Ethyl acetate was further added to the acrylic polymer obtained above to prepare an acrylic polymer solution having a total solid content concentration of 30%. Next, 0.1 part of N-phenyl-γ-aminopropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co...

Embodiment 2～9

[0192] In Example 1, as shown in Table 1, at least one of the type and amount of monomer components used when preparing an acrylic polymer, or the drying temperature or activity of the adhesive layer when making an adhesive polarizing plate The irradiation amount of the energy ray was changed, except that, as in Example 1, an acrylic polymer solution was prepared, and an acrylic adhesive was prepared in the same manner. In addition, the cumulative light amount of ultraviolet irradiation was changed as shown in Table 1, except Otherwise, an adhesive polarizing plate with a release liner was produced in the same manner as in Example 1. Among them, the weight average molecular weights of the acrylic polymers obtained in each example are shown in Table 1.

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Abstract

A pressure-sensitive adhesive for an optical film of the present invention comprises a (meth)acrylic polymer comprising 50 to 99.99% by weight of alkyl (meth)acrylate monomer unit and 0.01 to 30% by weight of a photocrosslinkable monomer unit having an unsaturated double bond-containing polymerizable functional group and a photocrosslinkable moiety different from the functional group. A pressure-sensitive adhesive layer is formed from the pressure-sensitive adhesive on at least one side of an optical film, wherein the photocrosslinkable moiety of the (meth)acrylic polymer in the pressure-sensitive adhesive is crosslinked by active energy ray irradiation. The pressure-sensitive adhesive can form the pressure-sensitive adhesive layer with a high level of durability and preferable workability.

Description

technical field [0001] The present invention relates to an adhesive for an optical film requiring transparency, an adhesive optical film in which an adhesive layer is formed on at least one side of the optical film by the adhesive set, and a production method thereof. Furthermore, the present invention relates to image display devices such as liquid crystal display devices and organic EL display devices using the pressure-sensitive adhesive optical film. As the above-mentioned optical film, a polarizing plate, a retardation film, an optical compensation film, a brightness improving film, and further, a member in which these are laminated can be used. Background technique [0002] In terms of liquid crystal displays, etc., it is necessary and indispensable to arrange polarizing elements on both sides of the liquid crystal cell from the perspective of its image forming method, and usually a polarizing plate is attached. In addition, in addition to using polarizing plates on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/06C09J7/00G02B5/30G09F9/00C09J7/22C09J7/38
CPCC09J133/066C09J7/0246C09J2433/00C09J7/38C09J7/22Y10T428/2809C09J133/06C08L33/06
Inventor 井上真一外山雄祐长田润枝细川敏嗣
Owner NITTO DENKO CORP
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