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Adhesive sheet, upper electrode for touch panel, and image display device

A touch panel and adhesive sheet technology, which can be used in identification devices, film/sheet-like adhesives, applications, etc., can solve problems such as obstacles to the thinning of image display devices, and achieve excellent adhesion durability and operability. Effect

Inactive Publication Date: 2010-08-11
MAXELL HLDG LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since the above-mentioned transparent adhesive material is relatively thick, it may hinder the thinning of the image display device.

Method used

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  • Adhesive sheet, upper electrode for touch panel, and image display device
  • Adhesive sheet, upper electrode for touch panel, and image display device
  • Adhesive sheet, upper electrode for touch panel, and image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0299] (1) Preparation of coating solution for forming hot water-resistant adhesiveness improving layer (E)

[0300] [Preparation of water-dispersible copolyester resin]

[0301] A water-dispersible copolyester was synthesized by using a pressurized esterification reaction tank with a distillation tower and two polycondensation reaction tanks with a vacuum generating device, using antimony trioxide as a polycondensation catalyst in batches.

[0302] The copolymerization composition of the water-dispersible copolyester is terephthalic acid / isophthalic acid / 5-sodiumsulfoisophthalic acid / / neopentyl glycol / ethylene glycol=50 / 43 / 7 / / 70 / 30 (molar ratio), the reduced viscosity is 0.68dl / g.

[0303] 〔Preparation of coating liquid〕

[0304] 100 parts of the crushed product of the above-mentioned water-dispersible copolyester was converted into a water dispersion by a predetermined method. With respect to 100 parts of the solid content of the aqueous dispersion, 5 parts of methylolate...

reference example 1

[0360] In the method of Example 1, except that the coating solution for forming the hot water-resistant adhesiveness improving layer (E) was changed to 8 parts of silicone ("KS-744"; manufactured by Shin-Etsu Chemical Co., Ltd.) and 0.06 parts of catalyst " Except that PL-3" (manufactured by Shin-Etsu Chemical Co., Ltd.) was dissolved in 100 parts by mass of toluene, a protective film for a display screen was obtained in the same manner as in Example 1. The evaluation results are shown in Table 1.

[0361] In the protective film for a display screen obtained in Reference Example 1, the silicone rubber adhesive layer (B) and the polyester-based base film (A) had poor hot water-resistant adhesiveness and were of low quality.

[0362] [Table 1]

[0363]

Embodiment 2

[0365] During the manufacture of the polyester base film (A) of Example 1, except that the coating of the coating liquid (E-1) was cancelled, the polyester base film (A-1) was obtained in the same manner as in Example 1. 2). Corona treatment was given to both surfaces of this polyester base film (A-2). In addition, a copolyester resin solution (“Bairon (registered trademark) 30SS”; manufactured by Toyobo Co., Ltd.) and a polyisocyanate-based crosslinking agent (“Coronet ( Registered trademark) HX"; Nippon Polyurethane Co., Ltd.), to prepare a coating solution (E-2) for the hot water-resistant adhesiveness improvement layer (E). This coating solution (E-2) was applied to both surfaces of the corona-treated polyester base film (A-2) using an applicator, and dried. A laminate in which the crosslinked hot water-resistant adhesiveness-improving layer (E-2) was laminated on both surfaces of the polyester-based base film (A-2) was obtained. Using this laminate, a protective film f...

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Abstract

Disclosed is an adhesive sheet wherein at least a polyester base film (A), a crosslinked silicone rubber adhesive layer (B) having a polydimethylsiloxane skeleton, a releasing layer (C) and a polyester film (D) are laminated in this order through or not through another layer. This adhesive sheet is characterized in that when the hot water adhesion resistance is evaluated by the method defined in the description, the silicone rubber adhesive layer (B) is not separated from the polyester base film (A), and the peel strength between the silicone rubber adhesive layer (B) and the releasing layer (C) is within the range of 0.03-1.0 N / 20 mm.

Description

technical field [0001] The present invention relates to an adhesive sheet having an adhesive layer excellent in adhesiveness and re-peelability, excellent in hot water-resistant adhesiveness between the adhesive layer and a base film, and moderately controlled peel strength between the adhesive layer and a separator. It also relates to an upper electrode for a touch panel and an image display device using the pressure-sensitive adhesive sheet. Background technique [0002] PSA sheets using a silicone rubber layer as an adhesive layer are used in a wide range of fields as PSA sheets requiring re-peelability (repairability) because they have both excellent stickability and re-peelability. The inventors of the present invention have disclosed various films having a silicone rubber adhesive layer using a silicone rubber compound as a raw material (for example, see Patent Documents 1 to 4). [0003] The films described in each patent document are suitable for various uses. Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02B32B27/00C09J183/04G02F1/1333G09F9/00C09J7/29
CPCG02F2201/50C09J7/0296B32B7/12C09J183/04G02F2202/28C09J2467/006B32B27/36C09J2483/00B32B7/06B32B25/08B32B25/20B32B2405/00B32B2457/20C09J7/29
Inventor 久世胜朗伊藤胜也东浦真哉岩谷晃之视野敦司内山隆司大野贤生斋藤大兴大谷寿幸工藤政尚
Owner MAXELL HLDG LTD
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