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Adhesive sheet, display body and their production method

A display body and adhesive technology, applied in the direction of chemical instruments and methods, adhesives, adhesive types, etc., can solve the problems of light reflection loss and other problems, and achieve the effects of high film strength, step difference followability and excellent foaming resistance

Active Publication Date: 2021-07-23
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 exists in steps
When the adhesive layer does not follow the level difference, the adhesive layer floats near the level difference and thus causes light reflection loss

Method used

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  • Adhesive sheet, display body and their production method
  • Adhesive sheet, display body and their production method
  • Adhesive sheet, display body and their production method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0098] (7) Preparation of adhesive composition

[0099] Adhesive composition P is the preparation of (meth)acrylate copolymer (A), after the obtained (meth)acrylate copolymer (A), thermal crosslinking agent (B), ultraviolet curable component ( C) and a photopolymerization initiator (D) are mixed, and it can also prepare by adding a silane coupling agent (E) and / or an additive as needed.

[0100] The (meth)acrylate copolymer (A) can be produced by polymerizing a mixture of monomers constituting a polymer by a normal radical polymerization method. The polymerization of a (meth)acrylate copolymer (A) can be performed by a solution polymerization method etc. 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.

[0101] As a polymerization initiator, an azo compound, an organic pero...

Embodiment 1

[0154] 1. Preparation of (meth)acrylate copolymer

[0155] Copolymerization of (meth)acrylates was prepared by copolymerizing 60 parts by mass of 2-ethylhexyl acrylate, 10 parts by mass of isobornyl acrylate, 10 parts by mass of N-acryloylmorpholine, and 20 parts by mass of 2-hydroxyethyl acrylate. Object (A). When the molecular weight of this (meth)acrylate copolymer (A) was measured using the method mentioned later, the weight average molecular weight (Mw) was 500,000.

[0156] 2. Preparation of Adhesive Composition

[0157] 100 parts by mass of the (meth)acrylate copolymer (A) obtained in the above step 1 (solid content conversion value; hereinafter the same), trimethylolpropane-modified toluene diisocyanate as a thermal crosslinking agent (B) 0.2 parts by mass, 5.0 parts by mass of ε-caprolactone-modified tris(2-acryloyloxyethyl)isocyanurate as the ultraviolet curable component (C), 2 , 0.5 parts by mass of 4,6-trimethylbenzoyl-diphenyl-phosphine oxide, and 3-glycidoxyp...

Embodiment 2～5、 comparative example 1～2

[0178] In addition to the type and ratio of each monomer constituting the (meth)acrylate copolymer (A), the type and amount of the thermal crosslinking agent (B), the compounding amount of the ultraviolet curable component (C), and the photopolymerization The kind and compounding quantity of the initiator (D) were changed as shown in Table 1, and it carried out similarly to Example 1, and produced the adhesive sheet.

[0179] Here, the above-mentioned weight average molecular weight (Mw) is a standard polystyrene-equivalent weight average molecular weight measured (GPC measurement) under the following conditions using gel permeation chromatography (GPC).

[0180]

[0181] · GPC measurement device: HLC-8020, manufactured by TOSOH;

[0182] · GPC column (passed in the following order): manufactured by TOSOH

[0183] TSK guard column HXL-H

[0184] TSK gel GMHXL (×2)

[0185] TSK gel G2000HXL;

[0186] Determination of solvent: tetrahydrofuran;

[0187] · Measurement tempe...

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Abstract

The present invention provides an adhesive sheet having a high film strength of an adhesive layer and excellent in both step followability and anti-bubble property, a display body excellent in both step followability and anti-bubble property, and the products thereof Preparation. The adhesive sheet (1) has an adhesive layer (11) for laminating one display constituent member (21) to another display constituent member (22), and the adhesive layer (11) is made of ultraviolet curable Composed of an adhesive, the adhesive has a cross-linked structure composed of a (meth)acrylate copolymer (A) and a thermal cross-linking agent (B), and contains an ultraviolet curable component (C), and at a concentration A photopolymerization initiator (D) having an absorbance of 0.3 or more at a wavelength of 380 nm in a 0.1 mass % acetonitrile solution.

Description

technical field [0001] The present invention relates to an adhesive sheet for bonding display body constituent members, a display body obtained by bonding display body constituent members, and their production methods. Background technique [0002] In recent years, various mobile electronic devices such as mobile phones, smartphones, and tablet computer terminals have used display modules including liquid crystal modules, light-emitting diodes (LED modules), organic electroluminescence (organic EL) modules, etc. display body (display). [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 protective panel and the display module so that even when the protective panel is deformed by an external force, the deformed protective panel does not collide with the display module. [0004] However, when there is such a gap as above, that is, an air layer, the reflection loss of light caused by the dif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J4/06C09J4/02C09J11/06C09J7/30C08F220/18C08F220/58C08F220/28C08F220/06
CPCC09J4/06C09J11/06C09J7/30C08F220/1808C08F220/1811C08F220/58C08F220/20C09J7/20C09J9/00C09J133/08C09J133/10B32B7/12B32B37/12B32B2457/20B32B2310/0831
Inventor 渡边旭平荒井隆行所司悟
Owner LINTEC CORP
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