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Adhesive sheet and display

An adhesive sheet, display technology, applied in the direction of adhesives, adhesive types, ester copolymer adhesives, etc. Excellent foaming effect

Pending Publication Date: 2016-10-12
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, if there is an air layer as mentioned above, the reflection loss of light caused by the difference in refractive index between the protective panel and the air layer, and the difference in refractive index between the air layer and the display module will increase, and the picture of the display will be larger. The problem of declining quality

Method used

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  • Adhesive sheet and display
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  • Adhesive sheet and display

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0074] (5) Preparation of adhesive composition

[0075] The adhesive composition P can be prepared by preparing the (meth)acrylate polymer (A), and then combining the obtained (meth)acrylate polymer (A), thermal crosslinking agent (B) and UV absorber (C), and add additives as required.

[0076] The (meth)acrylate polymer (A) can be prepared by polymerizing a mixture of monomers constituting a polymer by a normal radical polymerization method. The polymerization of the (meth)acrylate polymer (A) is preferably performed by a solution polymerization method using a polymerization initiator as needed. Examples of the polymerization solvent include ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone, and the like, and two or more of them may be used in combination.

[0077] As a polymerization initiator, an azo compound, an organic peroxide, etc. are mentioned, and 2 or more types may be used together. Examples of azo compounds include ...

Embodiment 1

[0134] 1. Preparation of (meth)acrylate polymer

[0135] The (meth)acrylate polymer (A) was prepared by copolymerizing 60 mass parts of n-butyl acrylate, 20 mass parts of methyl acrylate, and 20 mass parts of 2-hydroxyethyl acrylate. When the molecular weight of this (meth)acrylate polymer (A) was measured by the method mentioned later, it was 600,000 in weight average molecular weight (Mw).

[0136] 2. Preparation of Adhesive Composition

[0137] 100 parts by mass (solid content conversion value; the same below) of the (meth)acrylate polymer (A) obtained in the above step 1, 0.23 parts by mass of trimethylol as a thermal crosslinking agent (B) Propane-modified toluene diisocyanate (manufactured by Toyokemu Co., Ltd., product name "BHS8515"), 1.7 parts by mass (1.7 mass %) of 2,2- Dihydroxy-4-methoxybenzophenone (manufactured by Cytec Industries Inc., Japan, product name "Cyasorb UV24") was mixed, and fully stirred, and diluted with methyl ethyl ketone to obtain a solid cont...

Embodiment 2

[0142] 60 parts by mass of 2-ethylhexyl acrylate, 20 parts by mass of methyl methacrylate, and 20 parts by mass of 2-hydroxyethyl acrylate were copolymerized to prepare a (meth)acrylate polymer (A). When the molecular weight of this (meth)acrylate polymer (A) was measured by the method mentioned later, it was 700,000 in weight average molecular weight (Mw).

[0143] Coating of an adhesive composition (thermal crosslinking type) was prepared in the same manner as in Example 1, except that the (meth)acrylate polymer (A) obtained above was used and the solid content concentration was 40% by mass. solution. An adhesive sheet was prepared in the same manner as in Example 1 using the obtained coating solution of the adhesive composition.

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Abstract

The invention provides an adhesive sheet and a display which are not liable to be subjected to adverse influence of UV light and have excellent anti-foaming performance. The adhesive sheet (1) has an adhesive layer (11) which bonds a display forming component (21) to another display forming component (22), which have section difference at least on to-be-laminated sides. The adhesive layer (11) is composed of an adhesive that is formed by thremal-crosslinking an adhesive composition including (methyl)acrylate polymer (a), a thermal-crosslinker (b) and a ultraviolet absrober (c). The adhesive layer (11) is lower than 2% in haze and is lower than 1% in light transmittance under wavelength of 360 nm.

Description

technical field [0001] The present invention relates to an adhesive sheet for laminating constituent members of a display, and a display obtained using an adhesive layer of the adhesive sheet. Background technique [0002] In recent years, various mobile electronic devices such as mobile phones and tablet terminals have been equipped with displays (displays) using display modules including liquid crystal elements, light emitting diodes (LED elements), organic electroluminescence (organic EL) components, etc. [0003] In such a display, a protective panel is usually provided on the front side of the display module. A gap is provided between the protection panel and the display module to prevent the deformed protection panel from colliding with the display module when the protection panel is deformed due to external force. [0004] However, if there is an air layer as mentioned above, the reflection loss of light caused by the difference in refractive index between the prote...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J133/08
CPCC09J7/22C09J7/30C09J133/08C09J2433/00C09J2203/326C09J2301/122C09J2301/414C09J7/385C09J7/40C09J11/06C09J133/10C09J2203/338
Inventor 高桥洋一荒井隆行
Owner LINTEC CORP
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