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Pressure-sensitive adhesive composition and pressure-sensitive adhesive sheet

A pressure-sensitive adhesive, pressure-sensitive adhesive sheet technology, applied in the directions of adhesives, adhesive types, ester copolymer adhesives, etc., can solve the problems of warping or twisting of laminates, and achieve anti-foaming peeling performance and high temperature stress relaxation performance, high anti-foaming peeling performance effect

Inactive Publication Date: 2012-10-31
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, when the glass cover and other members have different linear expansion coefficients, the laminate obtained by laminating the glass cover and other members causes warpage in the laminate due to stress generated under high temperature conditions or twisted question

Method used

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  • Pressure-sensitive adhesive composition and pressure-sensitive adhesive sheet
  • Pressure-sensitive adhesive composition and pressure-sensitive adhesive sheet
  • Pressure-sensitive adhesive composition and pressure-sensitive adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0137] 5 parts by weight of methyl methacrylate (MMA), 1 part by weight of 4-hydroxybutyl acrylate (4HBA), 40 parts by weight of ethyl acrylate (EA) and 54 parts by weight of 2-methoxyethyl acrylate (2MEA), 0.25 parts by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator, and 185.7 parts by weight of ethyl acetate as a polymerization solvent were added to the detachable flask, and the mixture was stirred for 1 hour while nitrogen gas was introduced thereinto. Oxygen in the polymerization system was removed in this way, and then the reaction was carried out for 5 hours by raising the temperature to 65°C, and then the reaction was continued for 2 hours by raising the temperature to 70°C. Toluene was then added to obtain an acrylic polymer solution having a solid matter concentration of 30% by weight. The weight average molecular weight of the acrylic polymer in the acrylic polymer solution was 800,000, and the glass transition temperature (Tg) was -35°C.

[01...

Embodiment 2

[0141] A double-sided pressure-sensitive adhesive sheet (substrate-less double-sided pressure-sensitive adhesive sheet) was obtained in the same manner as in Example 1 except that, as shown in Table 1, 15 parts by weight of methacrylic acid was used Methyl acrylate (MMA), 3 parts by weight of 4-hydroxybutyl acrylate (4HBA), 40 parts by weight of ethyl acrylate (EA) and 42 parts by weight of 2-methoxyethyl acrylate (2MEA) As a monomer component, 0.3 parts by weight of an XDI-based crosslinking agent (trade name "TAKENATE D110N", manufactured by Mitsui Chemicals, Inc.) was used instead of the HDI-based crosslinking agent.

Embodiment 3

[0143] A double-sided pressure-sensitive adhesive sheet (substrate-less double-sided pressure-sensitive adhesive sheet) was obtained in the same manner as in Example 1 except that, as shown in Table 1, 5 parts by weight of methacrylic acid Methyl acrylate (MMA), 5 parts by weight of 4-hydroxybutyl acrylate (4HBA), 65 parts by weight of ethyl acrylate (EA) and 25 parts by weight of 2-methoxyethyl acrylate (2MEA) as a monomer component.

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Abstract

The present invention provides a pressure-sensitive adhesive composition excellent in the anti-foaming release property and high-temperature stress relaxation property, and a pressure-sensitive adhesive layer composed of the pressure-sensitive adhesive composition. The invention relates to a pressure-sensitive adhesive composition including an acrylic polymer which is formed from a monomer component including methyl methacrylate and has a glass transition temperature (Tg) of -40 DEG C or more, wherein the pressure-sensitive adhesive composition has a shear storage elastic modulus at 85 DEG C as measured by a dynamic viscoelasticity measurement of from 110 4 to 310 5 Pa.

Description

technical field [0001] The present invention relates to a pressure-sensitive adhesive composition and a pressure-sensitive adhesive sheet. More specifically, the present invention relates to a pressure-sensitive adhesive composition and a pressure-sensitive adhesive sheet each having excellent anti-foaming properties and excellent high-temperature stress relaxation properties. Background technique [0002] Recently, a display device such as a liquid crystal display (LCD) and an input device such as a touch panel used in combination with the display device have been widely used in various fields. In the manufacture of such display devices or input devices, etc., pressure-sensitive adhesive sheets (pressure-sensitive adhesive tapes) are used for laminating optical members together. For example, in the manufacture of touch panels, transparent pressure-sensitive adhesive sheets are used (see, for example, Patent Documents 1 to 3). Among them, a pressure-sensitive adhesive shee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/12C09J7/00
CPCC09J133/08C09J2203/318C09J133/066C09J133/06C09J7/0217C09J2201/622C09J7/385C08F220/281C09J2301/312C08F220/1802C08F220/14C08F220/20
Inventor 铃木孝岸冈宏昭夏井正赖
Owner NITTO DENKO CORP
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