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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 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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 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'-even 0.1 part by weight of azodiisobutyronitrile, after sufficient nitrogen substitution, reacted at 55° C. for 8 hours while stirring under nitrogen flow, and obtained a weight average molecular weight of 1.7 million (ratio of molecular weight of 100,000 or less: 3 area %) of acrylic polymer solution. Relative to 100 parts by weight of the solid content of the acrylic polymer solution, a polyisocyanate crosslinking agent (Coronate L, Japan Polyurethane Co., Ltd. ) and 0.1 part by weight of a silane coupling agent (manufactured by Shin-Etsu Silicone Co., Ltd., KBM403) was added to prepare a binder solution.

[0143]

[0144] Using the reverse roll coating method, the obtained adhesive solution was applied on a release sheet made of a polyester film (thickness: 38 μm) that had been sub...

Embodiment 2～12、 comparative example 1～4

[0152] In Example 1, when preparing the adhesive, the type or compounding amount of the monomer components was changed as shown in Table 1, and the weight-average molecular weight and low molecular weight ratio of the obtained acrylic polymer were controlled as shown in Table 1. Except the reaction conditions shown, it carried out similarly to Example 1, and produced the adhesive composition. Except Example 5, the ratio of the low molecular weight of an acryl-type polymer was superposed|polymerized at the polymerization temperature of 50-60 degreeC for 8 hours, and the ratio of a low molecular weight is Table 1. In Example 5, the low molecular weight ratio was controlled as shown in Table 1 by polymerizing at 60°C for 4 hours and then at 80°C. Moreover, except having used this adhesive solution, it carried out similarly to Example 1, and produced the adhesive type optical film.

[0153] The pressure-sensitive adhesive optical film obtained above was evaluated as follows. The...

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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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