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Pressure-sensitive adhesives and pressure-sensitive adhesive sheets

A pressure-sensitive adhesive sheet, pressure-sensitive adhesive layer technology, applied in the direction of adhesive type, pressure-sensitive film/sheet, ester copolymer adhesive, etc. Problems such as glare occur, and the effect of excellent step followability and excellent light diffusion can be achieved

Active Publication Date: 2022-04-08
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, recent liquid crystal panels require high-definition image quality, so problems such as glare, moire, and liquid crystal unevenness are likely to occur.

Method used

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  • Pressure-sensitive adhesives and pressure-sensitive adhesive sheets
  • Pressure-sensitive adhesives and pressure-sensitive adhesive sheets
  • Pressure-sensitive adhesives and pressure-sensitive adhesive sheets

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0097] (2) Preparation of pressure-sensitive adhesive composition

[0098] The pressure-sensitive adhesive composition P can be prepared in the following manner: preparing the (meth)acrylate polymer (A), adding the obtained (meth)acrylate polymer (A), polyrotaxane compound (B ) and the crosslinking agent (C) are mixed, and additives are added as needed.

[0099] 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 superposition|polymerization of a (meth)acrylate polymer (A) by the solution polymerization method 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.

[0100] As a polymerization initiator, an azo compound, an organic peroxide, etc. are menti...

manufacture example

[0135] As another production example of the pressure-sensitive adhesive sheet 1, the above-mentioned coating solution of the pressure-sensitive adhesive composition P is applied to the release surface of one release sheet 12a, and heat-treated to make the pressure-sensitive adhesive composition P P is thermally cross-linked to form a coating layer, and the release sheet 12a with the coating layer is obtained. In addition, the above-mentioned coating solution of the pressure-sensitive adhesive composition P is applied to the release surface of the other release sheet 12b, and heat treatment is performed to thermally crosslink the pressure-sensitive adhesive composition P to form a coating layer. A release sheet 12b with a coating layer was obtained. Next, the peeling sheet 12a with a coating layer and the peeling sheet 12b with a coating layer are bonded together so that both coating layers may contact each other. When the curing period is required, the laminated coating layer...

Embodiment 1

[0158] 1. Preparation of (meth)acrylate polymer

[0159] Copolymerize 47.5 parts by mass of n-butyl acrylate, 47 parts by mass of 2-ethylhexyl acrylate, 5 parts by mass of acrylic acid and 0.5 parts by mass of 2-hydroxyethyl acrylate by solution polymerization to prepare (meth)acrylic acid Ester polymer (A). As a result of measuring the molecular weight of this (meth)acrylate polymer (A) using the method mentioned later, it was 700,000 in weight average molecular weight (Mw).

[0160] 2. Preparation of pressure-sensitive adhesive composition

[0161] 100 parts by mass of the (meth)acrylate polymer (A) obtained in the above-mentioned step 1 (the value in terms of solid content, the same applies hereinafter), a polyrotaxane compound (B) (manufactured by Advanced Softmaterials Inc., product Name "SeRM Super Polymer SH 3407P", linear molecule: polyethylene glycol, cyclic molecule: α-cyclodextrin with hydroxypropyl and caprolactone chains, end-capping group: adamantyl, weight ave...

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Abstract

The present invention provides a pressure-sensitive adhesive and a pressure-sensitive adhesive sheet that are excellent in both light diffusing properties and step followability. The pressure-sensitive adhesive is a pressure-sensitive adhesive containing a (meth)acrylate polymer (A), a polyrotaxane compound (B) and a crosslinking agent (C) with a weight average molecular weight of more than 300,000 and less than 1.5 million. A pressure-sensitive adhesive obtained by crosslinking an adhesive-sensitive composition, the (meth)acrylate polymer (A) containing at least one of a hydroxyl group-containing monomer and a carboxyl group-containing monomer as a unit constituting the polymer Body unit, when containing a hydroxyl-containing monomer, contain the hydroxyl-containing monomer with a content of less than 20 mass%, when containing a carboxyl-containing monomer, contain the carboxyl-containing monomer with a content of less than 15 mass%, the polyrotaxane compound ( B) It has a reactive group-containing cyclic molecule, and the gel fraction of the pressure-sensitive adhesive is not less than 20% and not more than 99%.

Description

technical field [0001] The present invention relates to a pressure-sensitive adhesive and a pressure-sensitive adhesive sheet, in particular to a pressure-sensitive adhesive and a pressure-sensitive adhesive sheet which are suitable for laminating structural members of a display body. Background technique [0002] In recent years, liquid crystal panels have been increasingly used as displays (displays). In such a liquid crystal panel, in order to uniformize the brightness of a backlight, a light diffusing member is required to diffuse light from a light source. Furthermore, since high-definition image quality is required for recent liquid crystal panels, problems such as glare, moire, and liquid crystal unevenness tend to occur. From the viewpoint of solving the technical problems involved by the pressure-sensitive adhesive layer, a pressure-sensitive adhesive layer having light-diffusing properties has attracted attention. [0003] As such a light-diffusing pressure-sensi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J7/10C09J7/38C09J175/08C09J11/08C08F220/18C08F220/06C08F220/20C08G18/32C08G18/48C08G18/64C08G18/66C08G18/76
CPCC09J7/00C09J11/08C09J175/08C08F220/18C08G18/3206C08G18/4081C08G18/4833C08G18/6484C08G18/6677C08G18/7614C08G18/7642C09J2475/00C09J2467/005C09J2203/318C08F220/1808C08F220/1804C09J2301/208C09J2301/302C09J2301/414C09J2301/312C08L101/00C08F220/20C08F220/1811C08F220/06C09J133/08C09J133/10C09J11/06C09J7/40
Inventor 荒井隆行高桥洋一小鲭翔
Owner LINTEC CORP
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