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Adhesives and Adhesive Sheets

A technology of adhesives and adhesive sheets, applied in the direction of adhesives, adhesive types, rosin adhesives, etc., can solve problems such as peeling, lifting, and air bubbles, and achieve excellent step followability and excellent anti-foaming effects

Active Publication Date: 2018-03-20
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when high-temperature and high-humidity conditions are applied, bubbles may occur near the level difference or air leakage occurs from the plastic sheet used as a protective panel, causing bubbles, warping, peeling, etc.

Method used

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  • Adhesives and Adhesive Sheets
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  • Adhesives and Adhesive Sheets

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0066] (5) Preparation of adhesive composition

[0067] Adhesive composition P can be prepared by preparing (meth)acrylate polymer (A) and adding rosin ester viscosity-increasing liquid (B) to the obtained (meth)acrylate polymer (A) and Prepared by adding crosslinking agent (C) and additives.

[0068]The (meth)acrylate polymer (A) can be produced by superposing|polymerizing the mixture of the monomeric unit which comprises a polymer by a normal radical polymerization method. The (meth)acrylate polymer (A) can be superposed|polymerized by the solution polymerization method etc. using a polymerization initiator as needed. As a polymerization solvent, ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone, etc. are mentioned, for example, and 2 or more types may be used together.

[0069] As a polymerization initiator, an azo compound, an organic peroxide, etc. are mentioned, and 2 or more types may be used together. As azo compounds, f...

Embodiment 1

[0125] 1. Preparation of (meth)acrylate polymer

[0126] A (meth)acrylate polymer (A) was prepared by copolymerizing 60 parts by mass of 2-ethylhexyl acrylate, 20 parts by mass of methyl methacrylate, and 20 parts by mass of 2-hydroxyethyl acrylate. When the molecular weight of this (meth)acrylate polymer (A) was measured by the method mentioned later, the weight average molecular weight (Mw) was 600,000.

[0127] 2. Preparation of Adhesive Composition

[0128] 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 hereinafter) and rosin ester-based thickening liquid (B) (tackifier) ​​were mixed. Rosin ester compound (manufactured by Arakawa Chemical Industries, Ltd., product name "PINE CRYSTAL ME-G") 10 parts by mass, and toluene diisocyanate compound (manufactured by TOYOCHEM Co., Ltd., Product name "BHS8515") 0.25 parts by mass was well stirred, and diluted with methyl ethyl ketone, thereby obt...

Embodiment 2～3、 comparative example 1～4

[0144] As shown in Table 1, the ratio of each monomer constituting the (meth)acrylate polymer (A), the weight average molecular weight (Mw) of the (meth)acrylate polymer (A), and the type of tackifier were changed. And addition amount, and the kind and addition amount of a crosslinking agent (C), it carried out similarly to Example 1, and produced the adhesive sheet.

[0145] Here, the said weight average molecular weight (Mw) is the polystyrene equivalent weight average molecular weight measured by gel permeation chromatography (GPC) under the following conditions (GPC measurement).

[0146]

[0147] - GPC measurement device: HLC-8020 manufactured by Tosoh Corporation

[0148] · GPC column (passed in the following order): manufactured by Tosoh Corporation

[0149] TSK guard column HXL-H

[0150] TSK gel GMHXL (×2)

[0151]TSK gel G2000HXL

[0152] ·Measurement solvent: tetrahydrofuran

[0153] ·Measurement temperature: 40℃

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Abstract

The adhesive of the present invention is formed by cross-linking an adhesive composition, and the adhesive composition contains: (meth)acrylate polymer (A), which, as a monomer unit constituting the polymer, contains 8 to 30 mass % monomers with reactive functional groups; and rosin ester thickening liquid (B), and the gelling portion of the adhesive is 30-95%. Such an adhesive is excellent in both anti-foaming property and step followability.

Description

technical field [0001] The present invention relates to an adhesive agent and an adhesive sheet that can be used for touch panels and the like. Background technique [0002] In recent years, various mobile electronic devices such as mobile phones and tablet computers have been equipped with displays using display modules including liquid crystal elements, light-emitting diodes (LEDs), and touch panels. components), organic electroluminescence (organic EL) components, etc. [0003] In the upper display as described above, a protective panel is usually provided on the surface side of the display body module. As electronic devices become thinner and lighter, the above-mentioned protective panels are gradually changing 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, so that when the protective panel is deformed by an external force, the deform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/06C09J7/10C09J193/04
CPCC08L2312/00C09J133/066C09J193/04C09J7/00C09J2203/318
Inventor 高桥洋一荒井隆行
Owner LINTEC CORP
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