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Transparent double-sided adhesive sheet having polarized light eliminating function

A linear polarizing, adhesive sheet technology, applied in the direction of film/flake adhesive, adhesive type, nonlinear optics, etc. The effect of ensuring operability, reducing thickness, and ensuring image visibility

Active Publication Date: 2014-03-19
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if viewing with polarized sunglasses on, if the polarized transmission axis of outgoing light does not coincide with the polarized axis of the sunglasses, the transmitted light decreases, which may cause a significant deterioration in visibility or rainbow spots, etc. bad situation

Method used

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  • Transparent double-sided adhesive sheet having polarized light eliminating function

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Embodiment

[0094] Hereinafter, the present invention will be described in more detail based on the following examples and comparative examples.

[0095]

[0096] As an adhesive composition for forming the first adhesive layer, 2.5 g of an epoxy curing agent solution (manufactured by Soken Chemical Co., Ltd., E-AX) was added to 1 kg of adhesive resin solution to prepare an adhesive. Composition 1, the adhesive resin solution is obtained by diluting the acrylate copolymer to a solid content of 25% with ethyl acetate, wherein the acrylate copolymer is 70 parts by mass of butyl acrylate, methacrylic acid 20 parts by mass of methyl ester, 9 parts by mass of methyl acrylate and 1 part by mass of acrylic acid were randomly copolymerized.

[0097] On the other hand, as an adhesive composition for forming the second adhesive layer, 5 g of pentaerythritol triacrylate as an ultraviolet crosslinking agent and 4-methanol as a photopolymerization initiator were added to 1 kg of the acrylate copolyme...

Embodiment 2

[0101] Except that a polyethylene terephthalate biaxially oriented film (manufactured by Teijin DuPont Film Co., Ltd., "Melinex #850", thickness 15 μm, in-plane birefringence 0.012) is used to form the linear polarization canceling layer 2 instead of the linear polarization canceling layer 1 Except, operate in the same manner as in Example 1, and make a double-sided adhesive sheet 2 composed of release film 1 / adhesive layer 1 / linear polarization canceling layer 2 / adhesive layer 2 / release film 2 for engineering [ Adhesive layer 1 (25 μm) / linear polarization canceling layer 2 (15 μm) / adhesive layer 2 (150 μm)=total thickness 190 μm].

Embodiment 3

[0103] In addition to using a polycarbonate uniaxially stretched film (manufactured by Kaneka Co., Ltd., "Elmec R40", thickness 40 μm, in-plane birefringence 0.004) to form the linear polarization canceling layer 3 instead of the linear polarization canceling layer 1, and make the adhesive Except that the thickness of layer 2 was 135 μm, the same operation as in Example 1 was carried out, and a double-layer film composed of engineering release film 1 / adhesive layer 1 / linear polarization canceling layer 3 / adhesive layer 2 / engineering release film 2 was produced. Surface adhesive sheet 3 [(adhesive layer 1 (25 μm) / linear polarization canceling layer 2 (40 μm) / adhesive layer 2 (135 μm)=total thickness 200 μm].

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Abstract

Provided is a novel sheet having a polarized light eliminating function, which is arranged on the viewing side of a polarizing film and has a function of eliminating the linearly polarized light that has been transmitted through the polarizing plate. The sheet having a polarized light eliminating function can be reduced in the thickness of a layer that has the polarized light eliminating function, and can be easily handled when bonded. Proposed is a transparent double-sided adhesive sheet which is characterized by having adhesive layers on both the front and back sides, while having, as an intermediate layer, a layer that has a polarized light eliminating function (hereinafter referred to as "a polarized light eliminating function layer"). The transparent double-sided adhesive sheet is also characterized in that the polarized light eliminating function layer has a thickness within the range of 1-40 [mu]m, said thickness being smaller than the thickness of the front-side or back-side adhesive layer or the thicknesses of the adhesive layers on both the front and back sides.

Description

technical field [0001] The present invention relates to a transparent double-sided pressure-sensitive adhesive sheet for being arranged on the visible side of a polarizing film in an image display device. More specifically, it relates to a double-sided transparent pressure-sensitive adhesive sheet having a linear polarization canceling function, which can eliminate the occurrence of rainbow spots when an image display device is viewed through polarized sunglasses or the like. Background technique [0002] In a typical liquid crystal display device, image display light emitted from a liquid crystal module passes through a polarizing plate arranged on the visible side thereof, and is emitted in a linearly polarized state. Since human eyes do not perceive polarized light, even if it is emitted from the liquid crystal module in a linearly polarized state as described above, it usually does not affect visibility. However, if viewing with polarized sunglasses on, if the polarized...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C08F2/48C09J133/06C09J201/00G02B5/30G02B27/28G02F1/1335C09J7/22
CPCG02F1/133528C09J2201/128C09J2203/318G02B5/3083C09J7/0264G02B5/3033C09J2433/00C09J2201/622G02F1/13338G02F7/00G02F2202/28C09J7/22C09J2301/124C09J2301/312C09K2323/05C09K2323/03C08F2/48C09J7/00C09J133/06C09J201/00G02B5/30G02B27/28G02F1/1335B32B2457/20B32B2457/202
Inventor 新美嘉穗儿
Owner MITSUBISHI CHEM CORP
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