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Adhesive sheet for optical film, process for production of the adhesive sheet, adhesive optical film, and image display device

一种光学薄膜、制造方法的技术，应用在薄膜/薄片状的粘合剂、没有载体的薄膜/薄片、光学等方向，能够解决无法改善粘合剂层影响等问题

Active Publication Date: 2013-03-27
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even according to the above-mentioned patent documents, the influence of the unevenness of the adhesive layer on the visibility cannot be improved.

Method used

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  • Adhesive sheet for optical film, process for production of the adhesive sheet, adhesive optical film, and image display device
  • Adhesive sheet for optical film, process for production of the adhesive sheet, adhesive optical film, and image display device
  • Adhesive sheet for optical film, process for production of the adhesive sheet, adhesive optical film, and image display device

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0139]

[0140] Put 96.5 parts of butyl acrylate, 3 parts of acrylic acid, 0.5 parts of 2-hydroxyethyl acrylate, 0.15 parts of 2,2'-azobisisobutyronitrile and 100 parts by weight into a four-necked flask equipped with a nitrogen introduction pipe and a cooling pipe. Ethyl acetate, after sufficient nitrogen substitution, was reacted at 60° C. for 8 hours while stirring under a nitrogen stream, and an acrylic polymer solution having a weight average molecular weight of 1.65 million was obtained. With respect to 100 parts of solid content of the above acrylic polymer solution, 0.5 part of isocyanate crosslinking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronet L) was blended to prepare an adhesive coating solution (solid content 12%).

manufacture example 2

[0142]

[0143]Add 99.5 parts of butyl acrylate, 0.5 parts of 4-hydroxybutyl acrylate, 0.15 parts of 2,2'-azobisisobutyronitrile and 100 parts by weight of ethyl acetate into a four-necked flask equipped with a nitrogen introduction pipe and a cooling pipe, After sufficient nitrogen substitution, it reacted at 60 degreeC for 8 hours, stirring under nitrogen stream, and obtained the acrylic-type polymer solution whose weight average molecular weight was 1.65 million. With respect to 100 parts of the solid content of the above-mentioned acrylic polymer solution, 0.2 parts of an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronet L) was blended as a crosslinking agent to prepare an adhesive coating liquid (solid composition is 11.5%).

manufacture example 3

[0145]

[0146] Put 90 parts of butyl acrylate, 4 parts of acrylic acid, 5 parts of acryloyl morpholine, 1 part of 4-hydroxyethyl acrylate, 0.15 parts of 2,2'-azobis Isobutyronitrile and 100 parts by weight of ethyl acetate were fully substituted with nitrogen, and reacted at 60° C. for 8 hours while stirring under nitrogen flow to obtain an acrylic polymer solution with a weight average molecular weight of 1.65 million. With respect to 100 parts of the solid content of the above-mentioned acrylic polymer solution, 0.3 parts of an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronet L) was blended as a crosslinking agent to prepare an adhesive coating liquid (solid composition is 11.5%).

[0147]

[0148] A polyvinyl alcohol film having a thickness of 80 μm was stretched 5 times in an iodine aqueous solution and then dried to obtain a polarizing plate. A transparent protective film (triacetyl cellulose film, 80 μm in thickness) was b...

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Abstract

Disclosed is an adhesive sheet for an optical film, which comprises a mold release sheet and an adhesive layer formed on the mold release sheet, wherein the surface roughness (Ra) of the surface of the adhesive layer on the mold release sheet is 2 to 150 nm.The adhesive sheet can be produced by a production process comprising the steps of: applying an adhesive coating solution on a mold release sheet; and subjecting the adhesive coating solution to a first drying operation at a temperature of 30 to 80°C and an air flow rate of 0.5 to 15 m / second and a second drying operation at a temperature of 90 to 160°C and an air flow rate of 0.1 to 25 m / second to form an adhesive layer on the mold release sheet. When the adhesive sheet is applied to an image display device such as a liquid crystal display device, the occurrence of a trouble in visibility attributed to the adhesive layer can be reduced.

Description

technical field [0001] The present invention relates to an adhesive sheet for optical films and a method for producing the same. Furthermore, it is related with the pressure-sensitive adhesive optical film using this pressure-sensitive adhesive sheet for optical films. 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. Examples of the optical film include a polarizing plate, a retardation film, an optical compensation film, a brightness improving film, and an optical film obtained by laminating the above optical films. Background technique [0002] Liquid crystal panels are used in liquid crystal display devices for clocks, mobile phones, PDAs, notebooks, monitors for personal computers, DVD displays, TVs, and the like. In recent years, optical panels represented by liquid crystal panels have increasingly higher requirements for display characteristi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B7/12G02B5/30C09J7/00G02F1/1335C09J7/10
CPCB32B7/12G02B5/30G02F2202/28G02F1/1335C09J2201/622C09J7/00C09J7/10C09J2301/312C09J7/403C09J7/405C09J7/22G02B5/00C09J2203/318G02F1/133519
Inventor 井上真一佐竹正之
Owner NITTO DENKO CORP
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