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Adhesive sheet and display body

An adhesive sheet, display technology, applied in the direction of adhesives, adhesive types, ester copolymer adhesives, etc., can solve problems such as reflection loss of light

Active Publication Date: 2021-09-10
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the display module side of the protective panel, the frame-shaped printed layer may exist as a step
If the adhesive layer does not follow the level difference, the adhesive layer will float near the level difference, resulting in light reflection loss

Method used

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  • Adhesive sheet and display body
  • Adhesive sheet and display body
  • Adhesive sheet and display body

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0108] (5) Preparation of adhesive composition

[0109] The adhesive composition P can be produced by preparing a (meth)acrylate polymer (A), mixing the obtained (meth)acrylate polymer (A), a polyrotaxane compound (B), An isocyanate crosslinking agent (C), and additives are added as needed.

[0110] The (meth)acrylate polymer (A) can be produced by polymerizing a mixture of monomers constituting a polymer by a normal radical polymerization method. It is preferable to perform polymerization of a (meth)acrylate polymer (A) by the 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.

[0111] Examples of the polymerization initiator include azo compounds, organic peroxides, and the like, and two or more types may be used in combination. Examples of a...

Embodiment 1

[0160] 1. Preparation of (meth)acrylate polymer

[0161] Copolymerize 60 parts by mass of 2-ethylhexyl acrylate, 20 parts by mass of isobornyl acrylate, 5 parts by mass of N-acryloylmorpholine, and 15 parts by mass of 2-hydroxyethyl acrylate to prepare a (meth)acrylate polymer (A). As a result of measuring the molecular weight of this (meth)acrylate polymer (A) by the method mentioned later, the weight average molecular weight (Mw) was 600,000.

[0162] 2. Preparation of Adhesive Composition

[0163] 100 parts by mass of the (meth)acrylate polymer (A) obtained in the above step 1 (solid content conversion value; hereinafter the same), polyrotaxane compound (B) (manufactured by Advanced Softmaterials Inc., product name "CELM High Polymer SH3400P", linear molecule: polyethylene glycol, cyclic molecule: α-cyclodextrin with hydroxypropyl and caprolactone chains, protecting group: adamantyl, weight average molecular weight (Mw) 700,000 , hydroxyl value 72mgKOH / g) 3.0 parts by ma...

Embodiment 2～15

[0183] [Examples 2-15, Comparative Examples 1-5]

[0184] The type and ratio of each monomer constituting the (meth)acrylate polymer (A), the weight average molecular weight of the (meth)acrylate polymer (A), the amount of the polyrotaxane compound (B) added, the isocyanate Except that the kind and addition amount of the quasi-crosslinking agent (C) and the addition amount of the silane coupling agent were changed to those shown in Table 1, it carried out similarly to Example 1, and produced the adhesive sheet.

[0185] However, the weight average molecular weight (Mw) is a weight average molecular weight in terms of polystyrene measured using gel permeation chromatography (GPC) under the following conditions (GPC measurement).

[0186]

[0187] ・GPC measuring device: HLC-8020 manufactured by TOSOH CORPORATION

[0188] ・GPC column (passed in the following order): manufactured by TOSOH CORPORATION

[0189] TSK guard column HXL-H

[0190] TSK gel GMHXL (×2)

[0191] TSK ge...

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Abstract

The present invention provides an adhesive sheet and a display body in which an adhesive layer has excellent step followability and can exhibit high film strength. The adhesive sheet (1) of the present invention has an adhesive layer (11) for adhering one display body constituent member and another display body constituent member having a level difference at least on the surface of the bonded side, wherein , for the adhesive constituting the adhesive layer (11), the modulus at break when the 1000% modulus or elongation of the adhesive is broken before reaching 1000% when a tensile test is carried out at 23°C is: 0.22 MPa or more, and the step tracking rate of the adhesive layer (11) is 30% or more.

Description

technical field [0001] The present invention relates to an adhesive sheet suitable for bonding display constituent members, and a display obtained using the adhesive sheet. Background technique [0002] In recent years, various mobile electronic devices such as smartphones and tablet PCs have been equipped with displays using a display module, which is usually a touch panel, and the display module has a liquid crystal element, a light-emitting diode (LED element), Organic electroluminescent (organic EL) elements, etc. [0003] In the above-mentioned display, a protective panel is usually provided on the surface side of the display module. As electronic devices become thinner and lighter, the above-mentioned protective panels have been changed from conventional glass plates to plastic plates such as acrylic plates and polycarbonate plates. [0004] Here, a gap is provided between the protective panel and the display module to prevent the deformed protective panel from colli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J7/30C09J7/10C09J133/08C09J187/00C09J11/06
CPCC09J7/00C09J11/06C09J133/08C09J2203/318C09J2203/326C08L87/00C09J7/20C09J7/40C09J2301/312
Inventor 荒井隆行高桥洋一所司悟
Owner LINTEC CORP
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