Pressure-sensitive adhesive optical film and image display

An optical film and adhesive technology, which is applied in optics, identification devices, nonlinear optics, etc., can solve problems such as adhesive deterioration and poor appearance, and achieve the effect of suppressing display unevenness and improving display contrast

Inactive Publication Date: 2008-06-25
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 pr

Method used

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  • Pressure-sensitive adhesive optical film and image display

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0140] Example 1

[0141]

[0142] In a 4-necked flask equipped with a condenser, a stirring blade, and a thermometer, 87 parts by weight of butyl acrylate, 13 parts by weight of phenoxyethyl acrylate, and 2,2'-couple were placed together with 140 parts by weight of ethyl acetate. 0.1 parts by weight of nitrogen-bisisobutyronitrile, after sufficiently replacing nitrogen, the reaction was carried out at 55°C for 8 hours while stirring under nitrogen flow to obtain a weight average molecular weight of 1.7 million (ratio of molecular weight less than 100,000: 3 area %) of acrylic polymer solution. With respect to 100 parts by weight of the solid content of the acrylic polymer solution, 0.6 parts by weight of the solid content was added to a polyisocyanate-based crosslinking agent composed of a benzylidene diisocyanate adduct of trimethylolpropane (CoronateL, Japan Polyurethane Company) (Manufactured) and 0.1 parts by weight of a silane coupling agent (manufactured by Shin-Etsu Silic...

Example

[0151] Examples 2-12, Comparative Examples 1-4

[0152] In Example 1, when preparing the adhesive, the types or blending amounts of monomer components were as shown in Table 1, and the ratio of the weight average molecular weight and low molecular weight of the obtained acrylic polymer was controlled as shown in Table 1. Except for the reaction conditions shown, the same procedure as in Example 1 was carried out to prepare an adhesive composition. Except for Example 5, the ratio of the low molecular weight of the acrylic polymer was shown in Table 1 by polymerization at a polymerization temperature of 50 to 60°C for 8 hours. In Example 5, after polymerizing at 60°C for 4 hours, the polymer was polymerized at 80°C, and the low molecular weight ratio was controlled as shown in Table 1. In addition, except for using this adhesive solution, it carried out similarly to Example 1, and produced the adhesive optical film.

[0153] The following evaluation was performed for the adhesive op...

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PUM

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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 on one side of the transparent base film; and a pressure-sensitive adhesive layer that is provided on the discotic liquid crystal layer, wherein the pressure-sensitive adhesive layer is made from a pressure-sensitive adhesive containing an acrylic polymer comprising an alkyl(meth)acrylate (a1) and a ring structure-containing (meth)acrylate (a2) as monomer units and having a weight average molecular weight of 1,000,000 to 3,000,000, and a crosslinking agent. 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. In addition, the present invention 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 has a discotic liquid crystal layer, and can be used as an optical compensation film for improving the viewing angle characteristics of display contrast and display color. In particular, the adhesive optical film of the present invention laminated with a polarizing plate can be used as Elliptical polarizing plate with optical compensation. Background technique [0003] Liquid crystal display devices such as clocks, mobile phones, PDAs, notebook computers, monitors for personal computers, DVD players, TVs, etc. are rapidly expanding in the market. A liquid crystal display device is a device that visualizes a state change of polarized ligh...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02F1/1335C09J133/00C09J7/02G09F9/35G09F9/00
CPCC09D5/4411G02F1/1335G02F2202/28G09G2320/02
Inventor 矢野浩平小笠原晶子千叶刚外山雄祐井上真一佐竹正之
Owner NITTO DENKO CORP
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