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Pressure-sensitive adhesive composition for optical member, pressure-sensitive adhesive layer for optical member, pressure-sensitive adhesion type optical member, and image display device

A technology of optical components and adhesives, which is applied in the types of adhesives, non-polymer adhesive additives, adhesive additives, etc., can solve the problem of not meeting the amount of organic solvent used, reducing the height of the adhesive layer, and uniformity of the surface problems such as resistance, to achieve the effect of preventing arching or peeling, good applicability, and low viscosity

Active Publication Date: 2008-01-16
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, these conventional adhesive compositions cannot simultaneously satisfy the reduction of the amount of organic solvent used and the high surface uniformity of the adhesive layer to be formed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] (Preparation of adhesive composition for optical parts)

[0126] In a four-necked flask equipped with a nitrogen inlet tube and a condenser tube, add 70 parts of butyl acrylate, 25 parts of 2-ethylhexyl acrylate, 5 parts of acrylic acid, 0.08 parts of 2-hydroxyethyl acrylate and 0.1 part of 2,2 - Azobisisobutyronitrile and 160 parts of ethyl acetate were fully replaced with nitrogen, and then polymerized at 55°C for 12 hours while stirring under a nitrogen stream to obtain a compound with a weight average molecular weight of 2.2 million and a molecular weight of 100,000 or less. Acrylic polymer-containing solution (1) having a content rate of the polymer component of 2% by weight (solid content concentration: 37% by weight).

[0127] In this solution (1), add heptane (solubility parameter: 7.3) 327.3 parts, toluene (solubility parameter: 8.9) 27.3 parts and ethyl acetate (solubility parameter: 9.1) 30.9 parts, obtain solution (2) (solid content concentration : 15% by w...

Embodiment 2

[0132] (Preparation of adhesive composition for optical parts)

[0133] 245.5 parts of heptane, 109.1 parts of toluene, and 30.9 parts of ethyl acetate were added to the solution (1) to obtain a solution (3) (solid content concentration: 15% by weight). The content of the hydrocarbon solvent A (heptane) in the solution (3) is 45% of the total organic solvents, and the content of the high boiling point and high solubility solvent B (toluene) is 20% of the total organic solvents.

[0134] With respect to 100 parts of the polymer solid content of the solution (3), add and uniformly mix 0.1 part of 3-glycidoxypropyltrimethoxysilane used as a silane coupling agent, and 0.5 part of trimethylolpropane A polyisocyanate crosslinking agent composed of a tolylene diisocyanate adduct was used to prepare the adhesive composition b for optical parts.

[0135] (Manufacturing of bonded optical components)

[0136] A pressure-sensitive adhesive optical member was produced in the same manner ...

Embodiment 3

[0138] (Preparation of adhesive composition for optical parts)

[0139] 190.9 parts of heptane, 27.3 parts of toluene, and 30.9 parts of ethyl acetate were added to the solution (1) to obtain a solution (4) (solid content concentration: 15% by weight). The content of the hydrocarbon solvent A (heptane) in the solution (4) is 35% of the total organic solvents, and the content of the high boiling point and high solubility solvent B (toluene) is 5% of the total organic solvents.

[0140] With respect to 100 parts of the polymer solid content of the solution (4), add and uniformly mix 0.1 part of 3-glycidoxypropyltrimethoxysilane used as a silane coupling agent, and 0.5 part of trimethylolpropane A polyisocyanate crosslinking agent composed of a tolylene diisocyanate adduct was used to prepare an adhesive composition c for optical components.

[0141] (Manufacturing of bonded optical components)

[0142] A pressure-sensitive adhesive optical member was prepared in the same manne...

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Abstract

A pressure-sensitive adhesive composition for an optical member which comprises a (meth)acrylic polymer, a solvent (A) based on a hydrocarbon having 6 to 9 carbon atoms and a high boiling point and high solubility solvent (B) having a boiling point higher than that of the above hydrocarbon solvent and exhibiting the solubility for the (meth)acrylic polymer higher than that of the above hydrocarbon solvent, wherein the content of the solvent (A) based on the hydrocarbon is 20 to 60 wt % relative to the total amount of the solvents, and the ratio of the content (wt %) of the solvent (A) based on the hydrocarbon to that (wt %) of the high boiling point and high solubility solvent (B) (high boiling point and high solubility solvent (B) / hydrocarbon- based solvent (A)) is 0.05 to 4. The above pressure-sensitive adhesive composition for an optical member exhibits good applicability due to a reduced viscosity thereof, allows the reduction of the amount of an organic solvent to be used, and further can form a pressure-sensitive adhesive layer being excellent in durability and having a highly uniform surface.

Description

technical field [0001] The present invention relates to an adhesive composition for optical components. Moreover, this invention relates to the adhesive layer for optical members formed from this adhesive composition for optical members. In addition, the present invention also relates to an adhesive optical member having the adhesive layer, and an image display device such as a liquid crystal display device, an organic EL display device, and a PDP using the adhesive optical member. Examples of the optical member include polarizing plates, retardation plates, optical compensation films, brightness improvement films, and members in which these films are laminated. Background technique [0002] Adhesive layers used in optical parts are required to have a high level of thickness or surface uniformity. Therefore, lowering the polymer concentration at the time of coating reduces the viscosity of the polymer composition. However, in consideration of the environment, it is actual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30C09J133/06C09J11/06
CPCC09J133/04C09J133/06C09J133/08C09J11/06
Inventor 白藤文明佐竹正之矢野浩平诸石裕中野史子
Owner NITTO DENKO CORP
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