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Acrylic adhesive composition, adhesive and adhesive sheet

An acrylic and acrylic resin technology, applied in the direction of adhesive types, ester copolymer adhesives, film/sheet adhesives, etc., can solve problems such as durability decline, and achieve excellent level followability , Low dielectric constant, improve the effect of cohesion

Active Publication Date: 2021-04-13
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the method of using dilute monomers has a problem that unreacted monomers remaining in the adhesive layer lead to a decrease in durability at high temperatures

Method used

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  • Acrylic adhesive composition, adhesive and adhesive sheet
  • Acrylic adhesive composition, adhesive and adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0167] The following examples are given to illustrate the present invention more specifically, but the present invention is not limited to the following examples unless the gist is exceeded. In addition, when there are "part" and "%" in an example, it is a basis of weight except haze value. In addition, about the measurement of the weight average molecular weight of an acrylic resin, it measured by the method mentioned above.

[0168] [Manufacturing example 1]

[0169] 100 parts of acetone (boiling point 56°C) as a polymerization solvent and 2,2'-azobis(2,4-dimethylvaleronitrile) (ADVN: 10 Hour half-life temperature 52°C) 0.6 parts, pre-mixed monomer solution (stearyl methacrylate (SMA: a2-1) 50 parts (15% relative to the entire copolymerization component), lauryl methacrylate and methyl A mixture of tridecyl acrylate (SLMA: a2-1) 192 parts (57.6% to the total copolymerization component), 2-ethylhexyl methacrylate (2EHMA: a2-2) 50 parts (to the copolymerization 15% of the w...

manufacture example 2、 comparative manufacture example 1～2

[0172] Acrylic resins [A-2], [A'-1], and [A'-2] were produced in the same manner as in Production Example 1 except that the copolymerization components of the acrylic resin were set in accordance with Table 1.

[0173] [Table 1]

[0174]

[0175]

[0176] The acrylic resin [A-1] obtained above was sandwiched between two polyester release sheets (thickness 176 μm), and pressure was applied while heating at 100°C so that the thickness of the adhesive layer became 175 μm. , and then use high-pressure mercury UV irradiation device to peak illumination: 150mW / cm 2 , cumulative exposure: 1000mJ / cm 2 (500mJ / cm 2 ×2pass) was irradiated with ultraviolet rays to obtain a substrate-free double-sided adhesive sheet.

[0177] In addition, the release sheet on one side was peeled off from the adhesive layer of the double-sided adhesive sheet without the base material obtained above, and pressed onto an easy-adhesion-treated polyethylene terephthalate (PET) film (thickness 125 μm). ...

Embodiment 2

[0179] In the above-mentioned Example 1, except that the acrylic resin [A-1] was changed to the acrylic resin [A-2], the double-sided adhesive sheet without the base material of Example 2 was obtained in the same manner as in Example 1. and PET film with adhesive layer.

[0180]

[0181] In the above-mentioned Example 1, except that the acrylic resin [A-1] was changed to the acrylic resin [A'-1], the substrate-less double-sided adhesion of Comparative Example 1 was obtained in the same manner as in Example 1. Sheet and PET film with adhesive layer.

[0182]

[0183] In the above-mentioned Example 1, except that the acrylic resin [A-1] was changed to the acrylic resin [A'-2], the substrate-less double-sided adhesion of Comparative Example 2 was obtained in the same manner as in Example 1. Sheet and PET film with adhesive layer.

[0184] 〔Gel rate (1)〕

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Abstract

Provided is an acrylic adhesive composition suitable for thick coating as an adhesive that can obtain an adhesive that is thermally stable, excellent in heat-and-moisture resistance, and exhibits a low dielectric constant. Contains an acrylic resin (A) which is a copolymer of a copolymerization component containing a hydroxyl group-containing (meth)acrylate monomer (a1) and an alkyl (meth)acrylate monomer (a2) wherein, the alkyl (meth)acrylate monomer (a2) contains an alkyl (meth)acrylate monomer (a2-1) having a straight-chain alkyl group with 10 to 24 carbons, and the The copolymerization component contains 5 to 15% by weight of a hydroxyl group-containing (meth)acrylate monomer (a1), and 50 to 94% by weight of a (meth)acrylic alkyl group having a straight-chain alkyl group having 10 to 24 carbon atoms. Ester monomer (a2-1).

Description

technical field [0001] The present invention relates to an acrylic pressure-sensitive adhesive composition, an adhesive and a pressure-sensitive adhesive sheet comprising the above-mentioned acrylic pressure-sensitive adhesive composition. Acrylic adhesive composition for impasto application. Background technique [0002] In recent years, touch panels that combine liquid crystal displays and position input devices have become more widely used in mobile devices such as televisions, computer monitors, notebook computers, mobile phones, and tablet terminals. Among them, capacitive touch panels are increasing. [0003] A touch panel is generally composed of a liquid crystal display, a transparent conductive film substrate (ITO substrate), and a protective film (glass), and a transparent adhesive sheet is used for bonding these components. [0004] Adhesives for such transparent adhesive sheets require not only adhesive properties such as adhesive strength, but also shock absorp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/10C09J7/30C09J7/10
CPCC08F220/26C09J7/00C09J133/06C09J133/14C09J133/08C09J133/10
Inventor 浅野铁也中岛贵弘野原一树
Owner MITSUBISHI CHEM CORP
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