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Pressure-sensitive adhesive optical film and image display

An optical film and adhesive type technology, applied in the direction of adhesive type, optics, optical components, etc., can solve the problems of poor appearance, adhesive deterioration, etc., and achieve the effect of improving display 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

However, these adhesive compositions have problems in that additives such as plasticizers and oligomer components precipitate themselves during a long-term heating test, resulting in poor appearance and deterioration of the adhesive.

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] ((A) Preparation of (meth)acrylic polymer)

[0172] In a 4-neck flask equipped with a stirring paddle, a thermometer, a nitrogen inlet tube, and a condenser tube, add 99 parts by weight of butyl acrylate (BA), 1 part by weight of 4-hydroxybutyl acrylate (HBA), and 0.1 parts by weight of a polymerization initiator 2,2'-Azobisisobutyronitrile and 200 parts by weight of ethyl acetate, slowly stirring and introducing nitrogen gas at the same time to carry out sufficient nitrogen replacement, and then keep the liquid temperature in the flask at around 55°C for 8 hours Polymerization reaction, preparation of acrylic polymer (1) solution. The weight average molecular weight of the acrylic polymer (1) is 1.8 million.

[0173] ((B) Preparation of (meth)acrylic oligomer)

[0174] In a 4-neck flask equipped with a stirring paddle, a thermometer, a nitrogen inlet pipe and a condenser pipe, add 99 parts by weight of butyl acrylate (BA), 2 parts by weight of acrylic acid (AA), 3 pa...

Embodiment 2～6、 comparative example 1～9

[0184] In Example 1, the type or compounding amount of the monomer components used in the preparation of the adhesive ((A) (meth)acrylic polymer and (B) (meth)acrylic oligomer) was changed to As shown in Table 1, the presence or absence of the corresponding phenolic antioxidant when preparing the primer is changed as shown in Table 1, and the type of protective film is changed as shown in Table 1. In addition, the same as that of the embodiment 1 In the same manner, an adhesive optical film was prepared.

[0185] Also, in Comparative Example 5, the undercoat layer does not contain an antioxidant, but the adhesive layer contains an antioxidant, and the content thereof is 1 part by weight (vapor) per 100 parts by weight of the adhesive polymer (acrylic polymer). Ciba Specialty Chemicals, IRGANOX1010). In Comparative Example 9, neither the undercoat layer nor the pressure-sensitive adhesive layer may contain an antioxidant.

[0186] In addition, ZEONOR (manufactured by Japan ZE...

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Abstract

A pressure-sensitive adhesive optical film of the present invention comprises: an optical film comprising a transparent base film and a discotic liquid crystal layer provided on one side of the transparent base film; an undercoat layer; and a pressure-sensitive adhesive layer provided on the discotic liquid crystal layer with the undercoat layer interposed therebetween, the undercoat layer comprises a polymer and an antioxidant; and the pressure-sensitive adhesive layer comprises a (meth)acrylic polymer (A) comprising 80 to 99.5% by weight of an alkyl (meth)acrylate monomer unit and 0.05 to 3% by weight of a hydroxyl group-containing monomer unit and having a weight average molecular weight of 1,000,000 to 2,500,000; ; a (meth)acrylic oligomer (B) comprising 80 to 99.9% by weight of an alkyl (meth)acrylate monomer unit and 0.1 to 3% by weight of a carboxyl group-containing monomer unit and having a weight average molecular weight of 3,000 to 8,000; a crosslinking agent (C); and a silane coupling agent (D), and the pressure-sensitive adhesive layer comprises 10 to 40 parts by weight of the (meth)acrylic oligomer (B) based on 100 parts by weight of the (meth)acrylic polymer (A). The pressure-sensitive adhesive optical film has durability and can suppress display unevenness in a peripheral portion of a display screen and window frame unevenness in a state that a backlight is on.

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 in which a discotic liquid crystal compound is oriented, and in particular, a polarizing plate is laminated. The adhesive optical film can be used as an elliptically polarizing plate with optical compensation function. Background technique [0003] Liquid crystal display devices are rapidly spreading in the market for clocks, mobile phones, PDAs, notebook computers, monitors for personal computers, DVD players, TVs, and the like. A liquid crystal display device is a device for visualizing a stat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/10G02B5/30B32B7/02B32B27/00C09J7/29C09J133/14G02F1/13363
CPCC09J133/08C09J7/0246C08L33/08C09J2201/606C08K5/0025C09J7/0296G02B5/3016C09K2019/0429C09J2433/00C08K5/54C09J7/38C09J7/22C09J7/29C08L2666/04C09J2301/302G02F1/1337G02F1/1335C08J5/18
Inventor 矢野浩平杉野晶子千叶刚佐竹正之大平佳世
Owner NITTO DENKO CORP
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