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Ultraviolet curable pressure-sensitive adhesive composition, method for producing ultraviolet-curable pressure-sensitive adhesive sheet, and method for producing laminate

A curing type, ultraviolet technology, applied in the direction of bonding method, adhesive type, non-polymer organic compound adhesive, etc., can solve the problems of film thickness non-uniformity, air bubble entrainment, adhesive exudation, etc. , to achieve the effects of excellent humidity and heat whitening resistance, excellent shape retention, and excellent height difference followability

Active Publication Date: 2020-07-17
DIC CORPORATION
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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 crosslink density of the resin to impart flexibility like the above-mentioned adhesive, although the step followability is good, if the adhesive is too soft, it will flow when heated, and air bubbles will be involved. , Adhesive bleeding, unevenness of film thickness, etc.
Therefore, it is difficult to balance the two contradictory performances of height difference followability and shape retention.

Method used

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  • Ultraviolet curable pressure-sensitive adhesive composition, method for producing ultraviolet-curable pressure-sensitive adhesive sheet, and method for producing laminate
  • Ultraviolet curable pressure-sensitive adhesive composition, method for producing ultraviolet-curable pressure-sensitive adhesive sheet, and method for producing laminate

Examples

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Effect test

Embodiment

[0119] Hereinafter, the present invention will be described in more detail using examples.

Synthetic example 1

[0121]

[0122] 287 parts by mass of polyoxypropylene glycol (number-average molecular weight; 1,000, hereinafter abbreviated as "PPG"), 2-hydroxyethyl acrylate (hereinafter abbreviated as Denoted as "HEA".) 0.8 parts by mass, 1,4-hexanedimethanol (hereinafter abbreviated as "CHDM") 31 parts by mass, 1.1 parts by mass of 2,6-di-tert-butylcresol, p-methoxyphenol 0.2 parts by mass, 150 parts by mass of ethyl acetate. After the temperature in the reaction container was raised to 40° C., 110 parts by mass of isophorone diisocyanate (hereinafter abbreviated as “IPDI”) was added. Then, 0.05 parts by mass of dioctyltin dineodecanoate was added, and the temperature was raised to 75° C. over 1 hour. Then, after maintaining at 75° C. for 12 hours, 136 parts by mass of ethyl acetate was added, stirred for 30 minutes to achieve uniformity, and cooled to obtain non-volatile components: 60 mass %, weight average molecular weight: 39,000, hydroxyl content: 0.032 mol / kg, acryloyl group c...

Synthetic example 2

[0124]

[0125]205 parts by mass of PPG, 1.32 parts by mass of HEA, 42 parts by mass of CHDM, 1.1 parts by mass of 2,6-di-tert-butylcresol, p-methoxyphenol 0.2 parts by mass, 150 parts by mass of ethyl acetate. After the temperature in the reaction container rose to 40° C., 110 parts by mass of IPDI was added. Then, 0.05 parts by mass of dioctyltin dineodecanoate was added, and the temperature was raised to 75° C. over 1 hour. Then, after maintaining at 75° C. for 12 hours, 89 parts by mass of ethyl acetate was added, then stirred for 30 minutes to achieve uniformity, and cooled to obtain non-volatile components: 60 mass %, weight average molecular weight: 32,000, content of hydroxyl groups: 0.032 mol / kg, acryloyl group content: 0.032 mol / kg of urethane resin solution (A-2).

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Abstract

The problem to be solved by the present invention is to provide an ultraviolet curable adhesive composition that can obtain an ultraviolet curable adhesive sheet excellent in step followability and shape retention, and can be used for the above-mentioned ultraviolet curable adhesive. The cured product layer obtained by irradiating the sheet with ultraviolet rays imparts excellent moisture-heat whitening resistance. The present invention provides an ultraviolet curable adhesive composition, which is characterized in that it contains: a urethane resin (A) having a hydroxyl group and a (meth)acryloyl group, a polyisocyanate crosslinking agent (B), and a A (meth)acrylic compound (C), an organic solvent (D) and a photopolymerization initiator (E) having more than one (meth)acryloyl group. In addition, the present invention provides a method for producing an ultraviolet curable adhesive sheet, which is obtained by drying the organic solvent (D) after applying the above ultraviolet curable adhesive composition to a substrate.

Description

technical field [0001] The present invention relates to an ultraviolet curable adhesive composition that can be suitably used for manufacturing IT-related products. Background technique [0002] Mobile terminals such as smartphones and tablet PCs are equipped with a touch panel. The touch panel consists of a laminated body of cover glass, electrode glass / film, and liquid crystal panel. "OCA".) and is fixed. In smartphones, the cover glass is provided with a decorative layer, which creates a height difference of about 20 μm. Therefore, the OCA needs to be bonded to the cover glass while following the height difference (without entraining air bubbles, etc.). [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 PCs have large deformation due to large screens, requiring OCA to be able to follow larger height differences and deformation performance. In particular, from a des...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/14B32B27/16B32B27/30B32B27/40C09J4/02C09J5/00C09J7/30C09J11/06C09J7/20
CPCB32B27/16B32B27/30B32B27/40C09J5/00C09J11/06C09J175/14C09J7/20B32B37/12B32B2310/0831
Inventor 纲岛启次大地尉夫岩洼昌幸纲岛真理子
Owner DIC CORPORATION