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Adhesive sheet and laminate

A technology for adhesive sheets and laminates, applied in the direction of adhesives, layered products, polyether adhesives, etc., can solve problems such as reflection loss of light, achieve corrosion inhibition, excellent uneven tracking, and resistance to humidity and heat whitening Excellent performance and durability

Active Publication Date: 2019-05-10
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the display unit side of the protective panel, there may be cases where the frame-shaped printed layer exists in the form of concavo-convex
If the adhesive layer does not follow the unevenness, the adhesive layer will float near the unevenness, thereby causing light reflection loss.

Method used

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  • Adhesive sheet and laminate
  • Adhesive sheet and laminate
  • Adhesive sheet and laminate

Examples

Experimental program
Comparison scheme
Effect test

manufacture example

[0101] As another example of producing the adhesive sheet 1, the coating liquid of the above-mentioned adhesive composition P is applied on the release surface of one release sheet 12a, and heat-treated to thermally crosslink the adhesive composition P to form a coating. cloth layer to obtain a release sheet 12a with a coating layer. In addition, the coating liquid of the above-mentioned adhesive composition P is coated on the release surface of the other release sheet 12b, and heat-treated to thermally crosslink the adhesive composition P to form a coating layer, thereby obtaining a coated layer. Release sheet 12b for the cloth layer. Then, the release sheet 12a with a coating layer and the release sheet 12b with a coating layer are bonded so that both coating layers may contact. When the aging period is required, the aging period is provided; when the aging period is not required, the above-mentioned laminated coating layer becomes the adhesive layer 11 as it is. Thus, the...

Embodiment 1

[0140] 1. Preparation of (meth)acrylate copolymer

[0141] A (meth)acrylate copolymer (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 copolymer (A) was measured by the method mentioned later, the weight average molecular weight was 700,000.

[0142] 2. Preparation of adhesive composition

[0143] 100 parts by mass of the (meth)acrylate copolymer (A) obtained in the above step (1) (solid content conversion value; the same below), polyethylene glycol diethylene glycol as the active energy ray-curable component (B) Acrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name "NK ESTER A-400") 5 parts by mass, trimethylolpropane-modified toluene diisocyanate (manufactured by Nippon Polyurethane Industry Co., Ltd., Trade name "CORONATE L") 0.23 parts by mass, 3-(2,3-glycidoxy)propyltrimethoxysilane (manu...

Embodiment 2～9

[0158] [Examples 2-9, Comparative Examples 1-3]

[0159]In addition to the proportion of each monomer constituting the (meth)acrylate copolymer (A), the weight average molecular weight of the (meth)acrylate copolymer (A), the type and compounding of the active energy ray-curable component (B), The amount, the compounding amount of the crosslinking agent (C), the compounding amount of the photopolymerization initiator (D), the compounding amount of the silane coupling agent, and the thickness of the adhesive layer were changed according to Table 1, and the same as in Example 1 An operation is performed to manufacture an adhesive sheet. In addition, in Example 7, the thickness of each coating layer of the heavy release type release sheet with a coating layer and the light release type release sheet with a coating layer was 75 μm, and the thickness of the adhesive layer was 150 μm. Make adhesive sheets.

[0160] Here, the above-mentioned weight average molecular weight (Mw) is ...

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Abstract

The present invention provides an adhesive sheet and a laminate having an adhesive layer that uses an adhesive main agent that does not substantially contain a carboxyl group, and is excellent in conformability to unevenness, and at the same time, has heat-and-moisture whitening resistance and durability. Sex is also excellent. In order to solve the above problems, there is provided an adhesive sheet 1 having an adhesive layer 11 comprising (a base) acrylate copolymer (A), active energy ray curable component (B) and crosslinking agent (C), the weight average molecular weight of the (meth)acrylate copolymer (A) is 200,000 to 900,000 , as monomer units constituting the polymer, 15% by mass to 30% by mass of a monomer having a hydroxyl group is contained, and no monomer having a carboxyl group is contained.

Description

technical field [0001] The present invention relates to an adhesive sheet having an active energy ray curable adhesive layer and a laminate obtained using the adhesive layer of the adhesive sheet. Background technique [0002] Various mobile electronic devices such as mobile phones and tablet terminals in recent years include displays using display components such as liquid crystal elements, light emitting diodes (LED elements), and organic electroluminescence (organic EL) elements. [0003] In such a display, generally, a protective panel is provided on the front side of the display unit. A gap is provided between the protection panel and the display body assembly, so that even when the protection panel is deformed by external force, the deformed protection panel will not touch the display body assembly. [0004] However, if there is such a gap, that is, an air layer, the reflection loss of light caused by the difference in refractive index between the protective panel and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J7/30C09J7/25C09J171/00C09J4/02C09J4/00B32B7/12G02B5/30
CPCC09J9/00C09J133/064C09J2400/143C09J7/20G02B5/30
Inventor 江嶋由多加荒井隆行所司悟
Owner LINTEC CORP
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