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Adhesive composition adhesive and adhesive sheet

A composition and adhesive technology, applied in the direction of adhesive type, cyclodextrin adhesive, ester copolymer adhesive, etc., can solve the problem of light reflection loss, etc., and achieve the effect of reducing the haze value

Active Publication Date: 2020-02-11
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 composition adhesive and adhesive sheet
  • Adhesive composition adhesive and adhesive sheet
  • Adhesive composition adhesive and adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0091] (2) Preparation of adhesive composition

[0092] The adhesive composition P can be prepared by preparing the (meth)acrylate polymer (A), mixing the obtained (meth)acrylate polymer (A) with the polyrotaxane compound (B), and simultaneously A crosslinking agent (C), an active energy ray-curable component (D), additives, and the like are added as necessary.

[0093] 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. However, the present invention is not limited thereto, and polymerization may be performed without a solvent. 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 c...

Embodiment 1

[0157] 1. Preparation of (meth)acrylate polymer

[0158] A (meth)acrylate polymer was prepared by copolymerizing 80 parts by mass of 2-ethylhexyl acrylate, 5 parts by mass of 2-phenoxyethyl acrylate, and 15 parts by mass of 2-hydroxyethyl acrylate by a solution polymerization method. 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.

[0159] 2. Preparation of Adhesive Composition

[0160] 100 parts by mass of the (meth)acrylate polymer (A) obtained in the above step 1 (solid content conversion value; the same applies hereinafter), a polyrotaxane compound (B) (manufactured by Advanced Softmaterials Inc., product name "SeRM SuperPolymer SH3400P", linear molecule: polyethylene glycol, cyclic molecule: α-cyclodextrin with hydroxypropyl and caprolactone chains, capping group: adamantyl, weight average molecular weight (Mw) 700,000 , hydroxyl value 72 mgKOH / g) 5.0 pa...

Embodiment 2～8

[0176] [Examples 2-8, Comparative Examples 1-8]

[0177] In addition to the type and ratio of each monomer constituting the (meth)acrylate polymer (A), the weight average molecular weight of the (meth)acrylate polymer (A), and the blending amount of the polyrotaxane compound (B) , and the type and compounding amount of the crosslinking agent (C) were changed to those shown in Table 1, and an adhesive sheet was produced in the same manner as in Example 1.

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Abstract

An object of the present invention is to provide an adhesive composition, an adhesive, and an adhesive sheet capable of reducing haze under a normal temperature environment and a low temperature environment when a (meth) acrylic acid ester polymer and a polyrotaxane compound are contained. The adhesive composition comprises a (meth) acrylic acid ester polymer (A) and a polyrotaxane compound (B). The (meth) acrylic acid ester polymer (A) contains a monomer unit which contains an aromatic ring-containing monomer and a reactive functional group-containing monomer and constitutes the polymer, andthe content of the aromatic ring-containing monomer as a constituent monomer unit in the (meth) acrylic acid ester polymer (A) is 2.5% by mass or more and 30% by mass or less. The content of the reactive functional group-containing monomer as a structural monomer unit in (meth) acrylic acid ester polymer (A) is 5% by mass or more and 30% by mass or less.

Description

technical field [0001] The present invention relates to an adhesive composition, an adhesive, and an adhesive sheet, and particularly relates to an adhesive composition, an adhesive, and an adhesive sheet suitable as an optical adhesive that can be used at low temperatures. Background technique [0002] In recent years, various mobile electronic devices such as mobile phones, smartphones, and tablet terminals have displays (displays) that use a display module including a liquid crystal element, a light-emitting diode (LED element), an organic electroluminescent (Organic EL) elements, etc. [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 hit the display module. [0004] However, if there is a gap as described above, that is, if there is ...

Claims

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Application Information

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IPC IPC(8): C09J133/14C09J105/16C09J7/30C09J7/10
CPCC09J133/14C09J7/30C09J7/10C09J2203/318C09J2203/326C08L5/16C09J133/08C09J133/10C09J7/40C09J2301/312
Inventor 小泽祐树荒井隆行小鲭翔
Owner LINTEC CORP
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