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Adhesive sheet and optical member

A technology of adhesive sheets and adhesives, applied in the direction of adhesive types, ester copolymer adhesives, polyurea/polyurethane adhesives, etc., can solve the problem of heavy peeling, inability to pick up, surface resistivity or peeling Eliminate problems such as rise in electrostatic voltage, achieve the effect of improving breakage or deformation, achieving manufacturing efficiency, and excellent pick-up performance

Pending Publication Date: 2016-07-06
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the above-mentioned conductive polymer is used to form an antistatic layer, there is a possibility that PSS (corresponding to a dopant) will detach from PEDOT over time, resulting in an increase in surface resistivity or peeling electrostatic voltage, and there is a possibility that Problems such as increase in surface resistivity (deterioration) associated with oxidation degradation or photodegradation occur
[0007] In addition, when the surface resistivity increases (deterioration) occurs, static electricity is generated when the surface protection film is peeled off from the adherend, and there is a possibility of problems.
[0008] In addition, this surface protection film is peeled off at the stage when it is no longer needed, but with the increase in size and thickness of the liquid crystal display panel, damage to the polarizing plate or liquid crystal cell is likely to occur in the peeling process, so it is required to have a protective film when peeling. Moderate adhesive force that does not cause lifting, etc., and requires light peelability, pick-up, etc. to enable re-peeling
In particular, with the thinning of displays in recent years, the optical members constituting the displays have also become thinner, and optical members with a thickness of 150 μm or less and thinner optical members of 100 μm or less are distorted during the transportation process, and thus cannot be transported.
In addition, problems such as inability to completely bond optical members to other members also arise.
In order to avoid these problems, the surface protection film is thickened to suppress deflection, but the peeling becomes heavier due to thickening, so when the surface protection film is no longer needed, when the surface protection film is peeled off with a pick-up tape, there is a problem that the pick-up cannot be performed. situation

Method used

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  • Adhesive sheet and optical member
  • Adhesive sheet and optical member
  • Adhesive sheet and optical member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0283]

[0284] Add 100 parts by mass of butyl acrylate (BA), 5.0 parts by mass of acrylic acid (AA), 0.075 parts by mass of 2-hydroxyethyl acrylate (2HEA), 2 , 0.3 parts by mass of 2'-azobisisobutyronitrile and ethyl acetate were reacted at 60° C. for 6 hours while stirring under a nitrogen stream, thereby obtaining an acrylic polymer solution with a weight average molecular weight of 1.63 million. With respect to 100 parts by mass of the polymer solid content of the acrylic polymer solution, 0.6 parts by mass of an isocyanate polyfunctional compound (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name "CoronateL"), a silane coupling agent (manufactured by Shin-Etsu Chemical Co., Ltd. , trade name: KBM403) 0.08 parts by mass to prepare an acrylic adhesive 1 composition solution.

[0285] The above-mentioned adhesive composition solution is coated on a polyester resin film (manufactured by Toyobo Co., Ltd., trade name: E5000, thickness: 38 μm, tensile strength...

Embodiment 5

[0297]

[0298] As a polyol, 100 parts by mass of a polyol PREMINOLS3015 (manufactured by Asahi Glass Co., Ltd., Mn=15000) having three hydroxyl groups (OH groups), and a trimethylolpropane / toluene diisocyanate terpolymer as a polyfunctional isocyanate compound Adduct (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name: Coronate L) 13 parts by mass, organopolysiloxane (manufactured by Shin-Etsu Chemical Co., trade name "KF-6004", HLB: 9) 0.1 Parts by mass, 0.04 parts by mass of a catalyst (manufactured by Nippon Chemical Industry Co., Ltd., trade name: Nasem No. 2 Iron), 210 parts by mass of ethyl acetate as a diluent solvent, and stirred in a disperser to obtain a polyurethane-based adhesive composition (solution).

[0299]

[0300] Coating the above-mentioned polyurethane adhesive solution to the above-mentioned resin layer film with a top coat (the order of the top coat, the first resin layer, the adhesive layer, and the second resin layer) and the top c...

Embodiment 2～7 and comparative example 1～6

[0314] Based on the compounding content of Table 1 and Table 2, it carried out similarly to Example 1, and produced the pressure-sensitive adhesive sheet (surface protection film). It should be noted that other additives not compounded in Example 1 (for example, antistatic components compounded in the preparation of the binder solution, etc.) were compounded in the preparation of the binder solution. In addition, in Comparative Example 5, only the second resin layer shown in Table 4 was used instead of the resin layer film. The compounding quantity in Table 1 and Table 2 shows solid content.

[0315] Table 3 and Table 4 show the results of the above-mentioned various measurements and evaluations for the PSA sheets of Examples and Comparative Examples.

[0316] Table 1

[0317]

[0318] Table 2

[0319]

[0320] It should be noted that the abbreviations in Table 1 and Table 2 are as follows.

[0321] 2EHA: 2-Ethylhexyl Acrylate

[0322] BA: n-butyl acrylate

[0323]...

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Abstract

The invention relates to an adhesive sheet and an optical member. According to the technical scheme of the adhesive sheet, the anti-static property and the pickup property are improved, and the optical member is protected by the adhesive sheet. The adhesive sheet is characterized by successively comprising a first resin layer, an adhesive layer, a second resin layer and an adhesive layer formed by an adhesive composition. The ratio of the thickness of the adhesive layer to the thickness sum of the first resin layer and the second resin layer is 0.50 or less. The storage elastic modulus of the adhesive layer is larger than 1.0*10<4> Pa or smaller than 5.0*10<7> Pa at a temperature below 23 DEG C. One surface of the first resin layer, opposite to the surface of the adhesive layer, is provided with a mat coat blanket. The mat coat blanket is made of a mat coat blanket composition composed of polyaniline sulfonic acid as a conductive polymer component, polyester resin as an adhesive component, and isocyanate compound as a cross-linking agent. The adhesive component contains an organopolysiloxane with a polyoxyalkylene chain.

Description

technical field [0001] The present invention relates to an adhesive sheet and an optical member. [0002] The adhesive sheet of the present invention is used to protect polarizing plates, wavelength plates, phase difference plates, optical compensation films, reflection sheets, brightness enhancement films, protective glasses, It is useful as a surface protection film used for the surface of an optical member such as a cover plate, a hard coat film, a transparent conductive glass, and a transparent conductive film. Background technique [0003] In recent years, when optical components and electronic components are transported or mounted on a printed circuit board, each component is transferred in a state packaged with a predetermined sheet or in a state attached with an adhesive tape. Among these, surface protection films are widely used in the fields of optical and electronic components. [0004] A surface protection film is generally bonded to an adherend via an adhesive...

Claims

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Application Information

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IPC IPC(8): C09J7/02C09J133/08C09J175/04C09J11/06C09J11/08C09D167/00C09D179/02C09D7/12
CPCC09D7/63C09D167/00C09J7/255C09J7/29C09J11/06C09J11/08C09J133/08C09J175/04C09J2433/00C09J2203/318C09J2467/006C08L83/06C08L79/02
Inventor 片冈贤一天野立巳
Owner NITTO DENKO CORP