Transparent double-sided adhesive sheet and image display device using same

An adhesive sheet, double-sided technology, used in identification devices, adhesive types, ester copolymer adhesives, etc., can solve the blistering and peeling of component size changes, high moisture permeability, and oxidative deterioration of adhesive sheets, etc. problems, to achieve the effects of sufficient corrosion resistance reliability, improved cohesion, and excellent foam resistance

Active Publication Date: 2015-07-08
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By using a plastic plate or film as the material of the component, although the effect of weight reduction and thinning is obtained, compared with glass, the size of the resin component is likely to change due to environmental changes such as temperature and humidity, and the moisture permeability is high. Therefore, there is a problem that when the adhesive sheet is used to form an integral body, the adhesive sheet sandwiched between the members will absorb moisture and whiten, or the risk of blistering and peeling due to dimensional changes between the members will increase.
[0006] However, since such highly polar components have an oxidizing effect, the adhesive sheet may oxidize and deteriorate the adherend in an environment such as high temperature and high humidity or after long-term storage.

Method used

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  • Transparent double-sided adhesive sheet and image display device using same
  • Transparent double-sided adhesive sheet and image display device using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] Silica particles with an average particle diameter of 12 nm (manufactured by Nippon Aerosil, trade name "AEROSIL 200V") were mixed into 1 kg of the base polymer (Tg defined by the Tan δ peak temperature of dynamic viscoelasticity: -21°C, weight average molecular weight: 400,000). ”) 30g and 4-methylbenzophenone 30g, prepared adhesive composition, described base polymer is by 70 mass parts of butyl acrylate and 30 mass parts of vinyl acetate (the Tg obtained by DSC method is 31°C) formed by random copolymerization.

[0106] The above-mentioned adhesive composition was coated on a release PET (trade name "Diafoil MRA100") with a coater to a thickness of 150 μm, and then a release film was coated on the surface coated with the adhesive composition. Die PET (Diafoil MRF75).

[0107] Irradiate 365nm ultraviolet rays with a high-pressure mercury lamp from both surfaces sandwiching the release PET, so that the accumulated light amount reaches 1000mJ / cm 2 , and an adhesive sh...

Embodiment 2

[0109] Except that the base polymer was changed to the following acrylate copolymer (Tg defined by Tan δ peak temperature of dynamic viscoelasticity: -30°C, weight average molecular weight: 350,000), and the addition amount of silica fine particles was changed to 10g In the same manner as in Example 1, an adhesive sheet 2 was produced in which the acrylate copolymer was formed by random copolymerization of 80 parts by mass of 2-ethylhexyl acrylate and 20 parts by mass of 2-hydroxypropyl acrylate.

Embodiment 3

[0111] In addition to changing the base polymer to the following acrylate copolymer (Tg defined by the Tanδ peak temperature of dynamic viscoelasticity: -14°C, weight-average molecular weight: 420,000), and silica particles (Nippon Aerosil Company manufactures, trade name " AEROSIL 200V ") addition amount is changed to 50g, similarly to Example 1, adhesive sheet 3 is made, and described acrylate copolymer is made of butyl acrylate 69 mass parts, vinyl acetate 30 Parts by mass (Tg determined by DSC method: 31° C.) and 1 part by mass of acrylic acid were randomly copolymerized.

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Abstract

Provided is a novel transparent double-sided adhesive sheet which has corrosion resistance reliability that enables an object to be bonded to be prevented from deterioration due to corrosion, while having foaming resistance reliability that enables prevention of foaming at a bonding interface and optical reliability that enables suppression of haze increase even in a wet heat environment. Proposed is a transparent double-sided adhesive sheet which is first characterized by having an adhesive layer that contains a (meth)acrylic acid ester copolymer containing less than 2% by mass of a carboxyl group-containing monomer as a copolymerization component and fine silica particles having an average particle diameter of 4-500 nm. This transparent double-sided adhesive sheet is secondly characterized in that the adhesive layer can be cured by heat or ultraviolet light.

Description

technical field [0001] The present invention relates to a transparent double-sided adhesive that can be applied to bonding components of image display devices such as computers, portable terminals (PDAs), game machines, televisions (TVs), car navigation systems, touch panels, and digital tablets. sheet, and an image display device using the transparent double-sided adhesive sheet. Background technique [0002] In recent years, in order to improve the visibility of image display devices, liquid crystal displays (LCDs), plasma display panels (PDPs) or organic electroluminescent displays (organic EL displays) have been filled with adhesive sheets, adhesives, etc. Research on suppressing the diffuse reflection of incident light and outgoing light from a displayed image at the interface of the air layer through the gap between the image display panel and the member disposed on the front side (visible side). [0003] For example, in a touch panel display, a structure in which a t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/00B32B27/00C09J4/02C09J11/04C09J133/02G02F1/1333G09F9/00C09J7/10
CPCC09J7/00B32B27/00C09J133/02C09J11/04B32B2405/00C09J2203/318C09J2433/00G02F1/13338G02F2202/28C08K2201/005C08K2201/011C09J7/10C09J133/08C09J2301/304C09J2301/416C08K3/36C08F220/1808C08F220/20C08F220/1804C08F218/08
Inventor 新美嘉穗儿稻永诚
Owner MITSUBISHI CHEM CORP
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