Transparent double-sided adhesive sheet, laminate obtained using same for constituting image display device, process for producing said laminate, and image display device obtained using said laminate

An image display device, double-sided adhesive technology, applied in the direction of bonding methods, adhesive products, lamination devices, etc., can solve the problems of difficult to obtain stable quality, complicated operation, adhesive curing, etc., and achieve concave-convex tracking effect on reliability and resistance to blistering

Active Publication Date: 2015-09-23
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned method is not only complicated in operation when filling the liquid adhesive resin composition and poor in productivity, but also difficult to cure the adhesive in places where ultraviolet light is difficult to reach, such as the part shielded by the printing masking layer, and it is difficult to obtain stable quality. question

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0218] Hereinafter, it demonstrates in detail with reference to an Example and a comparative example. However, the present invention is not limited to these examples.

[0219] (Intermediate Composition A)

[0220] Acrylate copolymer obtained by random copolymerization of 75 parts by mass of 2-ethylhexyl acrylate (Tg-70°C), 20 parts by mass of vinyl acetate (Tg 32°C), and 5 parts by mass of acrylic acid (Tg 105°C) (Mw: 400,000, Mn: 90,000, Mw / Mn: 4.4) UV-curable resin propoxylated pentaerythritol triacrylate ("ATM-4PL" manufactured by Shin-Nakamura Chemical Co., Ltd.) as a cross-linking agent was uniformly mixed in 1 kg. 250 g, 3 g of 2,4,6-trimethylbenzoyldiphenylphosphine oxide (“LUCIRIN TPO” manufactured by BASF Corporation, molar absorption coefficient 160 at 365 nm, molar absorption coefficient 60 at 405 nm) as a visible light polymerization initiator, as ultraviolet light The intermediate layer composition A was prepared by using 10 g of 4-methylbenzophenone (SpeedCureM...

Embodiment 2

[0240] In Example 1, it was produced in the same manner as in Example 1, except that the adhesive layer composition B / intermediate layer composition A / adhesive layer composition B=50 μm / 50 μm / 50 μm were co-extruded into sheets. The transparent double-sided adhesive sheet 2 in the B-stage state (total thickness 150 μm).

[0241]

[0242]On one side of the polyethylene terephthalate film ("BYNA100GT" manufactured by Fujimori Industries Co., Ltd.: 87% light transmittance at wavelength 365 nm and 90% light transmittance at wavelength 405 nm) after peeling treatment, Co-extruded into a sheet shape so that the adhesive layer composition C / intermediate layer composition B / adhesive layer composition C=40 μm / 70 μm / 40 μm, and the peel-treated polyethylene terephthalic acid was laminated on the surface A glycol ester film ("MRF75" manufactured by Mitsubishi Plastics Co., Ltd.: 88% light transmittance at a wavelength of 365 nm and 90% light transmittance at a wavelength of 405 nm) was u...

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Abstract

The present invention provides a new transparent double-sided adhesive sheet which, when used in such a manner that a member which is a component of an image display device and in which the surface to be laminated has a difference in level is applied through the transparent double-sided adhesive sheet, can conform to the difference in level to completely fill the gap. Furthermore, the strain that arises inside the adhesive sheet can be mitigated, and the adhesive sheet can be made to retain non-foaming properties in high-temperature or high-humidity environments, without impairing the handleability. This adhesive sheet is a B-stage transparent double-sided adhesive sheet which is characterized firstly by comprising one or more (meth)acrylic ester (co)polymers, an ultraviolet polymerization initiator (A) which has a molar extinction coefficient, measured at a wavelength of 365 nm, of 10 or greater and a molar extinction coefficient, measured at a wavelength of 405 nm, of 0.1 or less, and a visible-light polymerization initiator (B) which has a molar extinction coefficient, measured at a wavelength of 405 nm, of 10 or greater, and is characterized secondly in that the value obtained by dividing the dynamic storage modulus (E') as measured by a tensile method at 60°C by the dynamic storage modulus (G') as measured by a shear method at 60°C, E' / G', is 10 or greater.

Description

technical field [0001] The present invention relates to a transparent double-sided adhesive sheet, a laminate for constituting an image display device using the transparent double-sided adhesive sheet, a method for producing the laminate, and an image display device formed using the laminate The transparent double-sided adhesive sheet can be applied to the structural members of image display devices such as personal computers, portable terminals (PDAs), game machines, televisions (TVs), car navigation systems, touch panels, and digital tablets. In particular, the present invention relates to a transparent double-sided adhesive sheet that can be applied to a structural member for an image display device having a step portion on the bonding surface. Background technique [0002] In recent years, in order to improve the visibility of image display devices, studies have been conducted to fill liquid crystal displays (LCDs), plasma displays (PDPs), electroluminescence displays (E...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J5/00B32B27/16B32B27/30C09J4/00C09J7/02C09J7/20
CPCB32B27/16B32B2405/00C09J7/02C09J5/00C09J4/00B32B27/308C09J133/12C08L2312/00B32B2457/20C09J133/02C09J11/08C09J133/08C09J2467/005C09J2433/00C09J2433/006C09J2203/318C09J2301/124C09J2301/416C08L93/04C08K5/0025G02F2202/28C09J7/20Y10T428/2809C09J2301/1242C09J2301/408B32B7/12B32B37/12B32B2305/72B32B2307/412C09J2433/003
Inventor 新美嘉穗儿稻永诚山本亮太
Owner MITSUBISHI CHEM CORP
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