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Optical double-sided pressure-sensitive adhesive sheet

A pressure-sensitive adhesive sheet, pressure-sensitive adhesive technology, applied in pressure-sensitive films/sheets, optics, adhesives, etc., can solve the problems of product application, uneven optical properties, uneven display, etc., and achieve excellent level difference absorption. , The effect of excellent anti-foaming peeling performance

Inactive Publication Date: 2012-12-26
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, there is a concern that local stress is applied to the product due to printing steps, thereby causing unevenness in optical characteristics (such as display unevenness, etc.)

Method used

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  • Optical double-sided pressure-sensitive adhesive sheet
  • Optical double-sided pressure-sensitive adhesive sheet
  • Optical double-sided pressure-sensitive adhesive sheet

Examples

Experimental program
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Effect test

preparation example Construction

[0126]The preparation method of the pressure-sensitive adhesive composition is not particularly limited. However, for example, an active energy ray-curable pressure-sensitive adhesive composition is prepared by mixing a monomer mixture for forming acrylic polymer A or a partial polymerization product thereof, acrylic polymer B, additives added as needed, and the like .

[0127] Although not particularly limited, the pressure-sensitive adhesive layer of the present invention is formed, for example, by coating (coating) a pressure-sensitive adhesive composition on a substrate or a release liner and drying and / or curing as necessary. For example, the pressure-sensitive adhesive layer of the present invention is formed by coating (coating) an active energy ray-curable pressure-sensitive adhesive composition on a substrate or a release liner, followed by irradiation with active energy rays. In addition to irradiation with active energy rays, heating and drying may be performed as ...

preparation example 1

[0172] By mixing 80 parts by weight of 2-ethylhexyl acrylate (2EHA), 11.5 parts by weight of 2-methoxyethyl acrylate (2MEA) and 8.5 parts by weight of N-vinylpyrrolidone (NVP) The resulting monomer mixture was mixed with 0.05 parts by weight of the trade name "IRGACURE 184" (manufactured by BASF Japan Ltd.) (Irg184) and 0.05 parts by weight of the trade name "IRGACURE 651" as a photopolymerization initiator. " (manufactured by BASF Japan Co., Ltd.) (Irg651) for blending. Thereafter, the mixture was irradiated with ultraviolet rays until the viscosity (at 10 rpm and at a measurement temperature of 30° C. using a BH viscometer equipped with a No. 5 rotor) reached about 20 Pa·s, thereby preparing a part of the above-mentioned monomer components. A prepolymer composition that has polymerized. The prepolymer composition thus prepared is designated as prepolymer composition (a).

preparation example 2

[0174] In addition to using a mixture obtained by mixing 85 parts by weight of 2-ethylhexyl acrylate (2EHA) and 15 parts by weight of N-vinylpyrrolidone (NVP) as a monomer mixture, with the above-mentioned prepolymerization A prepolymer composition was prepared in the same manner as in Preparation Example 1 of composition (a). The prepolymer composition thus prepared is designated as prepolymer composition (b).

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Abstract

The present invention provides an optical double-sided pressure-sensitive adhesive sheet excellent in step absorbability and anti-foaming release property. The invention relates to an optical double-sided pressure-sensitive adhesive sheet including a pressure-sensitive adhesive layer which contains an acrylic polymer A and an acrylic polymer B having a weight average molecular weight of from 1,000 to 30,000, and has a residual stress after 180 seconds of 3.0 N / cm 2 or less, the residual stress after 180 seconds being measured in accordance with a tensile stress relaxation test under the conditions of a temperature of 23 DEG C and a strain of 300 %.

Description

technical field [0001] The invention relates to a double-sided pressure-sensitive adhesive sheet. More specifically, the present invention relates to an optical double-sided pressure-sensitive adhesive sheet and a pressure-sensitively adhesive optical member used in laminating optical members or used in the manufacture of optical products. Background technique [0002] Recently, in various fields, a display device such as a liquid crystal display (LCD) or an input device such as a touch panel used in combination with the display device has been widely used. In the manufacture of display devices or input devices, transparent pressure-sensitive adhesive sheets are used for laminating optical members. For example, a transparent double-sided pressure-sensitive adhesive sheet is used for laminating a touch panel or the like to a liquid crystal display device (see Patent Documents 1 to 3, for example). [0003] Among the above optical members, optical members including members h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/00C09J133/00C09J133/08C09J133/10C09J7/02C09J7/10
CPCC09J133/08C09J133/04C09J7/0246C09J2201/128C09J2203/318C09J2433/00C09J7/00C09J7/38C09J7/22C09J7/10Y10T428/2883C09J2301/124C09J7/29C09J7/385G02B5/005
Inventor 宝田翔野中崇弘
Owner NITTO DENKO CORP
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