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Optical adhesive layer, manufacturing method of optical adhesive layer, optical film with adhesive layer, and image display device

An adhesive layer and adhesive technology, which is applied in the field of optical films, can solve the problems that the stress relaxation properties of the adhesive layer become smaller and smaller (narrowing, light leakage, etc.) bubble effect

Active Publication Date: 2019-05-21
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, considering the shrinkage of the polarizer itself, measures were taken to make it larger than the effective area for displaying images, but due to the narrowing of the frame (black matrix) part of the liquid crystal panel (transition to a narrow-frame panel), the shrinkage of the polarizer The area (remainder of the polarizer) also becomes smaller (narrower), and along with this, the polarizer shrinks and becomes smaller (narrower) than the frame part due to heat treatment, and light leakage becomes a problem
[0006] Regarding the above-mentioned problems, in the case of a hard adhesive layer (that is to say, when the gel ratio of the adhesive layer is high), the dimensional change of the polarizer can be reduced, thereby suppressing shrinkage, which is beneficial to a narrow frame. Therefore, there is In the case of using an adhesive layer with a high gel fraction, in this case, the stress relaxation property of the adhesive layer decreases, so peeling tends to occur easily and the durability tends to be poor
[0007] In addition, due to the shrinkage of the optical film, there is a problem that the adhesive layer itself is also deformed

Method used

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  • Optical adhesive layer, manufacturing method of optical adhesive layer, optical film with adhesive layer, and image display device
  • Optical adhesive layer, manufacturing method of optical adhesive layer, optical film with adhesive layer, and image display device
  • Optical adhesive layer, manufacturing method of optical adhesive layer, optical film with adhesive layer, and image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0147] (Preparation of (meth)acrylic polymer (A1))

[0148] A monomer mixture containing 95 parts of butyl acrylate and 5 parts of 4-hydroxybutyl acrylate was added to a 4-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a condenser. Further, 0.1 part of 2,2'-azobisisobutyronitrile as a polymerization initiator was added to 100 parts of the above-mentioned monomer mixture (solid content), together with 85 parts of ethyl acetate and 15 parts of toluene, and introduced while stirring slowly. After replacing nitrogen with nitrogen, the liquid temperature in the flask was kept at around 55°C, and polymerization was carried out for 30 minutes to prepare a (meth)acrylic polymer with a weight average molecular weight (Mw) of 1.8 million and Mw / Mn=1.92 Solution of (A1).

[0149] (Preparation of Adhesive Composition)

[0150] With respect to 100 parts of solid content of the solution of the above-mentioned (meth)acrylic polymer (A1) ob...

Embodiment 2～7、 and comparative example 1～4

[0163] In Examples 2 to 7 and Comparative Examples 1 to 4, the production methods of the above-mentioned (meth)acrylic polymers (A2) to (A5) were changed in the same manner as in Example 1, and changed as shown in Table 1. The types of monomers, their usage ratios, and the control of production conditions, prepared (meth)acrylic polymers with the polymer properties (weight-average molecular weight (Mw), polydispersity coefficient (Mw / Mn)) shown in Table 1. Solutions of (A2) to (A5).

[0164] In addition, except that the type or amount of the crosslinking agent was changed as shown in Table 1 with respect to each obtained (meth)acrylic polymer solution, an acrylic adhesive set was prepared in the same manner as in Example 1. solution of substances. Moreover, the polarizing film with an adhesive layer was produced similarly to Example 1 using the solution of the said acrylic adhesive composition.

[0165] The following evaluations were performed about the polarizing film with ...

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PUM

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Abstract

The purpose of the present invention is to provide: an optical adhesive layer which has excellent durability such that foaming, peeling, etc., do not occur on an adherend under heating and humidification conditions, and which does not cause optical leakage even on a narrow frame panel; an optical film with adhesive layer, having the aforementioned optical adhesive layer on at least one surface ofthe optical film; and a liquid crystal display device which uses the aforementioned optical film with adhesive layer. This optical adhesive layer, formed from an adhesive composition containing a (meth)acrylic polymer, is characterized by having a gel fraction exceeding 90%, and a 350,000 or higher weight average molecular weight of the sol content.

Description

technical field [0001] The present invention relates to an optical pressure-sensitive adhesive layer, a method for producing the optical pressure-sensitive adhesive layer, and an optical film with a pressure-sensitive adhesive layer having the above-mentioned optical pressure-sensitive adhesive layer on at least one surface of the optical film. Moreover, this invention relates to image display devices, such as a liquid crystal display device, an organic electroluminescent display device, and PDP using the said optical film with an adhesive layer. As the optical film, a polarizing film (polarizing plate), a retardation film, an optical compensation film, a brightness improving film, and an optical film in which the above films are laminated can be used. Background technique [0002] For liquid crystal display devices and the like, it is essential to arrange polarizing elements on both sides of the liquid crystal cell from the viewpoint of the image forming method, and usually...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/30C09J11/06C09J133/00G02B5/30G02F1/1335
CPCG02B5/30C09J133/08C08F220/1804C09J7/10C09J7/385C09J2203/318C09J2301/312C08F220/02C08F220/20C08F220/301C08F226/10G02F1/1335C09J7/00C09J11/06C09J133/00C09J133/066C09J133/24C09J2433/00G02F1/133711G02F1/1339C09K2323/00C09K2323/05C09K2323/057
Inventor 木村智之小野宽大杉野晶子外山雄祐
Owner NITTO DENKO CORP
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