Ultraviolet ray-curable adhesive sheet, and adhesive sheet

An adhesive sheet, ultraviolet technology, applied in the direction of non-polymer organic compound adhesives, film/sheet adhesives, non-polymer adhesive additives, etc., can solve the problem of reducing resin crosslinking density and film thickness. Non-uniformity, overflow of adhesive, etc., to achieve the effect of excellent moisture and heat whitening resistance

Active Publication Date: 2018-01-02
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the method of reducing the crosslinking density of the resin and imparting flexibility like the above-mentioned adhesive, although the step followability bec

Method used

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  • Ultraviolet ray-curable adhesive sheet, and adhesive sheet
  • Ultraviolet ray-curable adhesive sheet, and adhesive sheet
  • Ultraviolet ray-curable adhesive sheet, and adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0101] The present invention will be described in more detail below using examples.

Synthetic example 1

[0103]

[0104] 73 parts by mass of 2-ethylhexyl acrylate (hereinafter abbreviated as "2EHA"), dicyclopentanyl acrylate (manufactured by Hitachi Chemical Co., Ltd. " FA-513AS") 20 parts by mass, acrylic acid (hereinafter abbreviated as "AA") 5 parts by mass, 2-hydroxyethyl acrylate (hereinafter abbreviated as "HEA") 2 parts by mass, ethyl acetate 50 parts by mass, toluene 50 parts by mass portion, and the temperature was raised to 70° C. while blowing nitrogen gas under stirring. After 1 hour, 0.04 parts by mass of an azobisisobutyronitrile solution previously dissolved in ethyl acetate was added. Thereafter, after maintaining at 70° C. for 3 hours with stirring, the temperature was raised to 75° C., and 0.2 parts by mass of tetramethylbutylperoxyethylhexanoate and 1 part by mass of tert-hexyl peroxypivalate were added and kept for 5 hour, thereby obtaining the acrylic resin (A-1) with a non-volatile content of 50% by mass, a viscosity of 8,540 mPa·s, a weight-average molec...

Synthetic example 2

[0106]

[0107] Put 73 parts by mass of 2EHA, 20 parts by mass of FA-513AS, 5 parts by mass of AA, 2 parts by mass of HEA, and 100 parts by mass of ethyl acetate into a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen gas introduction tube, and a thermometer, and stir It heated up to 70 degreeC blowing nitrogen gas. After 1 hour, 0.04 parts by mass of an azobisisobutyronitrile solution previously dissolved in ethyl acetate was added. Thereafter, after holding at 70°C for 3 hours under stirring, the temperature was raised to 75°C and held for 5 hours to obtain a non-volatile content of 50% by mass, a viscosity of 49,900mPa·s, a weight average molecular weight of 740,000, and a number average molecular weight of Acrylic resin (A-2) with a temperature of 93,000 and a glass transition temperature of -41.8°C.

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Abstract

The problem to be solved by the present invention is to provide an ultraviolet ray-curable adhesive sheet which has excellent step follow-up properties, sheet retention properties and resistance to blushing under wet heat conditions and rarely undergoes the deposition of a residual adhesive on a cutting tooth during cutting with the cutting tooth. The present invention provides an ultraviolet ray-curable adhesive sheet produced by applying an adhesive agent composition comprising (A) an acrylic resin having a hydroxy group and/or a carboxyl group, (B) a cross-linking agent, (C) a (meth)acryliccompound having at least two (meth)acryloyl groups, (D) an organic solvent and (E) a photopolymerization initiator onto a sheet of release paper and then drying the organic solvent (D), said ultraviolet ray-curable adhesive sheet being characterized by having a storage modulus of more than 5 * 103 Pa and 1 * 105 Pa or less as measured under the conditions of a temperature of 20DEG C and a frequency of 10-7 Hz.

Description

technical field [0001] The present invention relates to an ultraviolet curable pressure-sensitive adhesive sheet that can be suitably used for manufacturing IT-related products. Background technique [0002] A touch panel is installed in a mobile terminal such as a smartphone or a tablet computer. The touch panel includes a cover glass, an electrode glass / film, and a laminated body of a liquid crystal panel. These are covered by an adhesive sheet (Optical Clear Adhesive, hereinafter Abbreviated as "OCA") fixed. In smartphones, a decorative layer is provided on the cover glass, which forms a step difference of about 20 μm. Therefore, the OCA needs to be adhered to the cover glass while following the step difference. [0003] In recent years, as the design of smartphones has improved, the thickness of the decorative layer has increased to about 60 μm. In addition, tablet-type terminals have large deformation due to large screens, and OCA is required to be able to follow larg...

Claims

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Application Information

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IPC IPC(8): C09J7/00C09J4/02C09J4/06C09J11/06C09J133/00C09J7/10
CPCC09J4/06C09J11/06C09J133/00C09J7/10C09J7/00C09J133/066C09J2301/312
Inventor 小松崎优纪桥口恒则
Owner DIC CORP
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