Pressure-sensitive adhesive optical film and image display

An optical film, adhesive technology, applied in the direction of adhesive type, optics, optical components, etc., can solve the problems of adverse effects of durability, poor appearance, deterioration of adhesives, etc., to suppress display unevenness and improve display. The effect of contrast

Active Publication Date: 2008-11-12
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the adhesive compositions proposed in Patent Documents 1 to 4, additives such as plasticizers and oligomer components are precipitated by themselves in a long-term heating test, resulting in poor appearance and deterioration of the adhesive.
In addition, there may be adverse effects on durability under heating and humidification heat environment
On the other hand, although the adhesive composition proposed in Patent Document 5 improves the above-mentioned problems such as precipitation, the stress relaxation property is insufficient, and the display unevenness and durability cannot be sufficiently satisfied.

Method used

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  • Pressure-sensitive adhesive optical film and image display
  • Pressure-sensitive adhesive optical film and image display
  • Pressure-sensitive adhesive optical film and image display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0171] (Preparation of Acrylic Polymer (a1))

[0172]In a 4-neck flask equipped with a stirring paddle, a thermometer, a nitrogen inlet pipe, and a condenser, add 100 parts by weight of butyl acrylate (BA), 1 part by weight of 2-hydroxybutyl acrylate, and 0.3 parts by weight of 2 as a polymerization initiator. 2'-Azobisisobutyronitrile and 50 parts by weight of ethyl acetate were stirred slowly while nitrogen gas was introduced to carry out sufficient nitrogen replacement, and then the liquid temperature in the flask was kept at around 55°C for 8 hours of polymerization. Prepare an acrylic polymer (a1) solution. The weight average molecular weight of the said acrylic polymer (a1) was 1.5 million.

[0173] (Preparation of urethane polymer (b1))

[0174] In a 4-neck flask equipped with a stirring paddle, a thermometer, a nitrogen inlet pipe and a condenser pipe, add 75 parts by weight of polyoxytetramethylene glycol and 0.05 part by weight of dibutyltin dilaurate, slowly stir ...

Embodiment 2

[0181] In Example 1, instead of 30 parts by weight of the urethane polymer (b1), 150 parts by weight of the urethane polymer (b1) was used, and it was carried out in the same manner as in Example 1, Make adhesive optical films.

Embodiment 3

[0183] In Example 1, except having used the following acrylic polymer (a2) instead of the said acrylic polymer (a1), it carried out similarly to Example 1, and produced the adhesive type optical film.

[0184] (Preparation of Acrylic Polymer (a2))

[0185] In a 4-necked flask equipped with a stirring paddle, a thermometer, a nitrogen inlet tube, and a condenser tube, add 100 parts by weight of butyl acrylate (BA), 5 parts by weight of acrylic acid, 0.1 part by weight of 2-hydroxybutyl acrylate, and 0.3 parts by weight as a polymerization The initiator 2,2'-azobisisobutyronitrile and 50 parts by weight of ethyl acetate were slowly stirred while nitrogen gas was introduced to fully replace the nitrogen, and then the liquid temperature in the flask was kept at around 55°C to carry out 8 hours of polymerization reaction to prepare an acrylic polymer (a2) solution. The weight average molecular weight of the said acrylic polymer (a2) was 1.6 million.

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Abstract

A pressure-sensitive adhesive optical film of the present invention comprises an optical film; and a pressure-sensitive adhesive layer laminated on at least one side of the optical film, wherein the pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive containing a (meth)acrylic polymer (A) and a resin component (B) having an aromatic ring structure in its main chain. The pressure-sensitive adhesive optical film has durability and can be prevented from causing display unevenness in a peripheral portion of a display screen.

Description

technical field [0001] The invention relates to an adhesive optical film. Further, it also relates to image display devices such as liquid crystal display devices, organic EL display devices, CRTs, and PDPs using the pressure-sensitive adhesive optical film. [0002] The adhesive optical film of the present invention can be used as an optical compensation film for improving viewing angle characteristics of display contrast and display color by having a discotic liquid crystal layer therein, and in particular, the adhesive optical film of the present invention laminated with a polarizing plate can be Used as an elliptically polarizing plate with optical compensation. Background technique [0003] Liquid crystal display devices attract attention due to their thinness, lightness, and low power consumption. They are widely used in portable devices such as mobile phones and clocks, OA devices such as personal computer monitors and notebook computers, and household appliances suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/10G02B5/30B32B27/30C09J133/00C09J169/00C09J175/04C09J179/08C09J201/00G02F1/1335G02F1/13363
CPCC09K2019/0429Y10T428/2891Y10T428/1082B32B27/08C09K2323/059G02F1/13363C08J5/18G02B5/30
Inventor 杉野晶子矢野浩平千叶刚佐竹正之
Owner NITTO DENKO CORP
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