UV-curable adhesive sheets and adhesive sheets

A technology of adhesive sheets and ultraviolet rays, 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, overflow viscosity, etc. Mixture, uneven film thickness and other problems, to achieve the effect of excellent resistance to heat and humidity whitening

Active Publication Date: 2020-11-17
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 becomes good, if the adhesive is too soft, there may be flow during heating to entrain air bubbles or Problems such as overflow of adhesive, non-uniformity of film thickness, etc.

Method used

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  • UV-curable adhesive sheets and adhesive sheets
  • UV-curable adhesive sheets and adhesive sheets
  • UV-curable adhesive sheets and adhesive sheets

Examples

Experimental program
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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 curable PSA sheet which is excellent in height difference followability, sheet retention, and heat-and-moisture whitening resistance, and has no adhesive residue on the blade during cutting. The present invention provides an ultraviolet curable adhesive sheet, which is characterized in that it is an ultraviolet curable adhesive sheet obtained by coating an adhesive composition on release paper and drying an organic solvent (D). The mixture composition contains: an acrylic resin (A) having a hydroxyl group and / or a carboxyl group, a crosslinking agent (B), a (meth)acrylic compound (C) having two or more (meth)acryloyl groups, an organic Solvent (D) and photopolymerization initiator (E), the temperature of 20 ℃, frequency 10 ‑7 The storage modulus measured under the condition of Hz exceeds 5×10 3 Pa and 1×10 5 Below Pa.

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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Patent Type & Authority Patents(China)
IPC IPC(8): C09J7/30C09J4/02C09J4/06C09J11/06C09J133/00C09J7/10
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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