Adhesive, adhesive sheet, and display element

A technology of adhesives and displays, applied in the direction of adhesives, adhesive types, ester copolymer adhesives, etc., can solve the problems of light reflection loss and other problems, and achieve the effect of excellent step followability and high film strength

Active Publication Date: 2017-08-18
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the adhesive layer does not follow the level difference, the adhesive layer will float around the level difference, resulting in light reflection loss

Method used

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  • Adhesive, adhesive sheet, and display element
  • Adhesive, adhesive sheet, and display element
  • Adhesive, adhesive sheet, and display element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0152] 1. Preparation of (meth)acrylate polymer

[0153] Copolymerize 90 parts by mass of n-butyl acrylate and 10 parts by mass of acrylic acid to prepare a (meth)acrylate polymer (A), and measure the molecular weight of the (meth)acrylate polymer (A) by the method described later , The weight average molecular weight (Mw) is 400,000.

[0154] 2. Preparation of Adhesive Composition

[0155] 100 parts by mass of the (meth)acrylate polymer (A) obtained in the above step (1) (value in terms of solid content; the same applies below), and tris(propylene) as the active energy ray-curable component (B) Acyloxyethyl) isocyanurate (manufactured by TOAGOSEI CO., LTD., product name "M-315") 0.1 parts by mass, and 1,3-bis( N,N-diglycidylaminomethyl)cyclohexane (manufactured by MITSUBISH GAS CHEMICAL COMPANY, INC., product name "TETRAD-C", solid content concentration: 100% by mass) 0.05 parts by mass, and as silane coupling 0.2 parts by mass of 3-glycidyloxypropyltrimethoxysilane (manuf...

Embodiment 2～17、 comparative example 1～4

[0185] In addition to the proportion of each monomer constituting the (meth)acrylate polymer (A), the weight average molecular weight of the (meth)acrylate polymer (A), the type of active energy ray-curable component (B) and the addition The amount, the type and addition amount of the crosslinking agent (C), and the addition amount of the silane coupling agent were changed as shown in Table 1, and an adhesive sheet was produced in the same manner as in Example 1. In addition, Comparative Examples 1 and 4 were not subjected to ultraviolet irradiation treatment.

[0186] Here, the above-mentioned weight average molecular weight (Mw) is the weight average molecular weight in terms of polystyrene measured by gel permeation chromatography (GPC) under the following conditions (GPC measurement).

[0187]

[0188] ・GPC measurement device: manufactured by TOSOH CORPORATION, HLC-8020

[0189] ・GPC column (passed in the following order): manufactured by TOSOH CORPORATION

[0190] TSK...

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Abstract

An adhesive for cementing together one display element constituent member having a step on the surface on the to-be-cemented side and another display element constituent member, wherein the adhesive is obtained by causing an adhesive composition to be thermally crosslinked and cured using active energy rays, said composition containing a (meth)acrylic ester polymer (A) that includes a reactive-functional-group-containing monomer as a monomer unit constituting a polymer, a bi- or higher-functional component (B) that can be cured using active energy rays, and a thermally crosslinkable crosslinking agent (C). The adhesive composition contains the active-energy-ray-curable component (B) in such an amount that the gel fraction (G1) of the adhesive and the gel fraction (G2) of the adhesive formed by thermally crosslinking the adhesive composition from which the active energy ray curable component (B) has been excluded are substantially the same, and, assuming that the adhesive is formed into a layer measuring 600 mum in thickness and 10 mm in width, the maximum stress when the adhesive layer extends in length up to elongation at break at a measurement length of 20 mm and a tensioning rate of 200 mm / minute in a 23 DEG C, 50% RH environment is 2.8 N or more.

Description

technical field [0001] The present invention relates to an adhesive, an adhesive sheet for pasting components of a display body, and a display obtained by using the adhesive layer of the adhesive sheet. Background technique [0002] Recently, various mobile electronic devices such as mobile phones and tablet computer terminals are equipped with displays (displays) with display modules such as liquid crystal components, light-emitting diodes (LED components), and organic electroluminescent diodes (organic EL) components. [0003] In the display, a protective panel is usually installed on the surface side of the display module, and there is a gap between the protective panel and the display module, so that even if the protective panel is deformed by an external force, the deformed protective panel will not touch the display module. . [0004] However, if there is such a gap, that is, if the air layer exists, the light reflection loss due to the difference in refractive index ...

Claims

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Application Information

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IPC IPC(8): G09F9/00C09J4/06C09J7/00C09J133/04C09J7/10
CPCC09J4/06C09J133/04G09F9/00C09J7/10C09J7/40C09J7/00C09J2301/312
Inventor 荒井隆行高桥洋一所司悟
Owner LINTEC CORP
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