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Optical adhesive composition, optical adhesive and optical film

A technology of adhesives and compositions, applied in the directions of non-polymer adhesive additives, adhesive types, adhesive additives, etc., can solve the problems of low compatibility of acrylic polymers and lack of transparency of polarizers , to achieve the effects of excellent transparency, suppression of light leakage, and improved compatibility

Active Publication Date: 2011-05-11
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] However, in the pressure-sensitive adhesive sheet disclosed in Patent Document 1, there is a problem that the acrylic polymer having a radiation polymerizable group in the side chain will react with the monomer containing alkyl (meth)acrylate as the main component. The acrylic polymer obtained by bulk polymerization has low compatibility and lacks transparency when used for bonding polarizers as optical materials

Method used

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  • Optical adhesive composition, optical adhesive and optical film
  • Optical adhesive composition, optical adhesive and optical film
  • Optical adhesive composition, optical adhesive and optical film

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no. 1 Embodiment approach

[0065] The first embodiment of the present invention is an optical adhesive composition containing the following (A) to (D) components.

[0066] (A) 100 parts by weight of a (meth)acrylate polymer having a weight average molecular weight of 200,000 to 2,500,000

[0067] (B) 1 to 50 parts by weight of a reactive (meth)acrylate polymer having a weight average molecular weight of 30,000 to 1,500,000 and having an ethylenic double bond in a side chain

[0068] (C) 0.1 to 50 parts by weight of polyfunctional (meth)acrylate compound

[0069] (D) 0.01 to 10 parts by weight of photopolymerization initiator

[0070] Hereinafter, the first embodiment of the present invention will be specifically described with reference to the accompanying drawings as appropriate.

[0071] 1. (A) Ingredient

[0072] (1) Type

[0073] (A) Component is a (meth)acrylate polymer, and is a so-called acrylic polymer.

[0074] Moreover, as a point different from (B) component mentioned later, (A) componen...

no. 2 Embodiment approach

[0198] A second embodiment of the present invention is an optical adhesive obtained by curing an optical adhesive composition, wherein the optical adhesive is obtained through steps (1) to (3). form.

[0199] (1) Step of preparing an optical adhesive composition containing the following (A) to (D) components

[0200] (A) 100 parts by weight of a (meth)acrylate polymer having a weight average molecular weight of 200,000 to 2,500,000

[0201] (B) 1 to 50 parts by weight of a reactive (meth)acrylate polymer having a weight average molecular weight of 30,000 to 1,500,000 and having an ethylenic double bond in a side chain

[0202] (C) 0.1 to 50 parts by weight of polyfunctional (meth)acrylate compound

[0203] (D) 0.01 to 10 parts by weight of photopolymerization initiator

[0204] (2) The step of applying the optical adhesive composition to the release film

[0205] (3) 50~1000mJ / cm 2 The step of irradiating an active energy ray with an irradiation dose within the range to obt...

no. 3 Embodiment approach

[0252] A third embodiment of the present invention is an optical film comprising an adhesive layer containing the optical adhesive of the second embodiment on a film base material, wherein the adhesive is The thickness of the layer is set to a value within the range of 1 to 100 μm.

[0253] Below, refer to figure 1 A third embodiment of the present invention will be specifically described.

[0254] 1. Film substrate

[0255] The film base material 101 in the optical film 100 of the present invention is not particularly limited as long as it is a film base material used for an optical film.

[0256] For example, optical films used for liquid crystal displays, such as a polarizing plate, a polarizing layer protective film, a viewing angle widening film, an antiglare film, a retardation film, etc. are mentioned.

[0257] In particular, as long as it is the optical film of the present invention, even when the film base material is a polarizer, the occurrence of light leakage ca...

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Abstract

The invention relates to an optical adhesive composition, an optical adhesive and an optical film, which do not require an aging treatment, can effectively prevent the occurring of light leak even during the exposure to environment change, and have excellent transparency. The invention provides an optical adhesive composition comprising (A) 100 parts by weight of (methyl) acrylic acid ester polymer whose weight average molecular weight is 200 thousand to 2.5 million, (B) 1 to 50 parts by weight of (methyl) acrylic acid ester polymer whose side chain has the reactivity of an ethylene double bond and whose weight average molecular weight is 30 thousand to 1.5 million, (C) 0.1 to 50 parts by weight of multifunctional (methyl) acrylic acid ester compound, (D) 0.01 to 10 parts by weight of photopolymerization initiator.

Description

technical field [0001] The present invention relates to an optical adhesive composition, an optical adhesive, and an optical film that are cured using active energy rays. In particular, it relates to an optical adhesive composition, an optical adhesive and an optical film which do not require an aging treatment, can effectively suppress the occurrence of light leakage even when exposed to environmental changes, and are excellent in transparency. Background technique [0002] In order to perform favorable image display in a liquid crystal display device etc., it is necessary to optically uniformly bond a polarizing plate to a liquid crystal cell, and to maintain optical properties. [0003] That is, in a liquid crystal display device or the like, the warping and peeling of the bonding portion caused by the dimensional change of the polarizer, and the uneven residual stress caused by the dimensional change of the polarizer, etc., are so-called "light leakage". The reason is t...

Claims

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Application Information

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IPC IPC(8): C09J4/02C09J4/06C09J7/00G02B1/10G02B5/30C09J4/00C09J11/06C09J133/06C09J175/14G02F1/1335
CPCC09J4/00C09J7/22C09J7/385C09J133/04C09J2203/318C09J2301/302C09J2301/40C09J2301/416G02B5/3025G02B5/305
Inventor 荒井隆行又野仁所司悟
Owner LINTEC CORP
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