Double sided adhesive tape

A double-sided, adhesive tape technology, applied in the direction of adhesives, adhesive types, ester copolymer adhesives, etc., can solve the problems of difficulty in imparting water resistance, damage between foam substrate layers, and difficulty in achieving water resistance, etc., to achieve Effect of imparting waterproof function, preventing intrusion, and excellent waterproof function

Active Publication Date: 2010-10-13
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if only a foam is used as a base material alone, it is difficult to suppress microscopic voids at the interface between the component and the adhesive layer, even if there are voids that can be immersed in water on a part of the interface, floating (floating) ), it is difficult to achieve water resistance because the water intrusion path will be expanded from there
In particular, in the application of portable electronic devices, it is difficult to provide sufficient adhesive tape in the case of narrow tape width and thin tape thickness due to the narrow frame and further thinning requirements accompanying the recent increase in screen size. waterproof
[0005] In addition, in portable electronic devices, etc., in order to improve the yield at the time of manufacture, double-sided adhesive tapes, parts, etc. that have not been successfully bonded to unfinished products are sometimes peeled off (reprocessed), and in order to process finished p

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] (Preparation of double-sided adhesive tape)

[0126] With respect to 100 parts by mass of the above-mentioned adhesive solution A, 1.24 parts by mass of "Coronet (Coronet) L-45" (isocyanate-based crosslinking agent, 45% solid content) manufactured by Nippon Polyurethane Co., Ltd. ), stirred for 15 minutes, and then coated on a peel-treated PET film with a thickness of 75 μm to a thickness of 35 μm after drying, and dried at 80° C. for 3 minutes to form an adhesive layer.

[0127] Next, in the white polyolefin foam (thickness: 130 μm, expansion ratio 2.5 times, 25% compressive strength: 130kPa, tensile modulus: 1140N / cm 2 , Tensile strength 14.8N / cm, the surface corona treated wettability index of 52mN / m) on both sides, after pasting each of the above-mentioned adhesive sheets, a roller with a linear pressure of 5kg / cm was used for lamination. Thereafter, it was aged at 40° C. for 48 hours to obtain a double-sided adhesive sheet with a thickness of 200 μm.

Embodiment 2～5

[0129] Both sides were obtained by the same method as in Example 1, except that the foam substrate described in Table 1 was used instead of the white polyolefin-based foam, and the thickness of the adhesive after drying was changed to the thickness shown in Table 1. Adhesive tape.

Embodiment 6

[0131]In the same manner as in Example 1, except for adding 0.8 parts by mass of Nippon Polyurethane Co., Ltd. "Kronet L-45" (isocyanate-based crosslinking agent, solid content 45%) to 100 parts by mass of adhesive solution A, method to obtain double-sided adhesive tape.

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Abstract

A double sided adhesive tape is provided with adhesive layers on two surfaces of foam substrate. The interlayer strength of the foam substrate is more than 12N/cm, and 25% compressive strength is 30-170kPa. The adhesive layer is composed of an acrylic acid series composition which comprises the following components: acrylic acid series copolymer which comprises (methyl)acrylate with 4-12 carbon atoms and vinyl monomer with carboxyl as monomer component, and polymerized abietate series adhesive resin. According to the double sided adhesive tape, even when the rigid members are bonded with eachother, excellent sealing performance, reprocessing adaptability and repeeling performance between the double sided adhesive tape and the member being bonded can be realized. Furthermore water impregnating can be effectively prevented.

Description

technical field [0001] The present invention relates to a double-sided adhesive tape with a foam substrate as the core. Background technique [0002] In portable electronic devices such as electronic notebooks, mobile phones, PHS, cameras, music players, and TVs, double-sided adhesive tapes are used for fixing various parts and modules, represented by the lamination of the protective panel of the information display part and the case. . In order to secure a competitive advantage in the market, various functions are pursued, one of which is the function of imparting water resistance. [0003] As an adhesive tape for fixing parts of electronic devices, surface adhesion to a specific adherend is disclosed, for example, having a maximum value of loss tangent (tan δ) in the temperature range of -40 to -15°C. The strength is 19N / cm 2 The above-described adhesive layer is provided on both surfaces of a support body in a double-faced adhesive sheet (refer to Patent Document 1). ...

Claims

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Application Information

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IPC IPC(8): C09J7/02C09J133/08
CPCC08L93/04C09J7/241C09J11/08C09J133/08C09J2423/006
Inventor 岩崎刚高野博树
Owner DIC CORP
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