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Adhesive tape

A technology of adhesive tape and adhesive layer, applied in the direction of adhesive, film/sheet adhesive, transportation and packaging, etc., can solve the problem of low rework adaptability, high rework adaptability requirements, expensive components, etc. problems, to achieve the effect of excellent rework adaptability, high design requirements, and excellent impact resistance

Active Publication Date: 2014-09-10
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, since components such as image display modules and protective panels of portable electronic equipment are expensive, when the components are fixed or the portable electronic equipment fails after manufacture, the requirement for adaptability to rework, which can properly separate the fixed components, is also required. higher
However, for adhesive tapes using foam substrates, especially adhesive tapes that have been reduced in thickness and narrow in width, the rework suitability tends to be lowered, so it is necessary to improve the rework suitability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] (Preparation of double-sided adhesive tape)

[0133] Add 1.1 parts by mass of "CORONATE L-45" (isocyanate-based crosslinking agent, 45% solid content) manufactured by Nippon Polyurethane Co., Ltd. to 100 parts by mass of the above-mentioned adhesive composition (A), and stir for 15 minutes to dry The final thickness is 40 μm, and it is coated on the release-treated surface of the PET film with a thickness of 75 μm after release treatment, and dried at 80° C. for 3 minutes to form an adhesive layer. The gel fraction of the pressure-sensitive adhesive layer was 48% by mass, and the temperature showing the peak of the loss tangent (tan δ) at a frequency of 1 Hz was -16°C.

[0134] Next, the black polyolefin-based foam (1) (thickness: 170 μm, apparent density 0.40 g / cm 3 , 25% compressive strength: 346kPa, tensile strength in flow direction: 1124N / cm 2 , Tensile strength in the width direction: 754N / cm 2 , interlayer strength: 31.6N / cm, manufactured by Sekisui Chemical I...

Embodiment 2

[0136] A double-sided adhesive tape with a thickness of 300 μm was obtained in the same manner as in Example 1 except that the thickness after drying of the pressure-sensitive adhesive composition (A) was 65 μm.

Embodiment 3

[0138] Using the adhesive composition (B) instead of the adhesive composition (A), with respect to 100 parts by mass of the adhesive composition (B), add "CORONATE L-45" (isocyanate-based crosslinking agent , solid content 45%) 1.33 parts by mass and stirred for 15 minutes, and then coated on the peeling treatment surface of the PET film with a thickness of 75 μm after the peeling treatment so that the thickness after drying became 65%. A double-sided adhesive tape with a thickness of 300 μm was obtained in the same manner as in Example 1. The gel fraction of the pressure-sensitive adhesive layer was 37% by mass, and the temperature showing the peak of the loss tangent (tan δ) at a frequency of 1 Hz was 2°C.

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Abstract

An adhesive tape which has an adhesive layer on at least one face of a foam substrate, wherein the 25% compressive strength of the foam substrate is 250 kPa or more, the average bubble size in the flow direction and width direction in the foam substrate is 150 mum or less, and the ratio of the average bubble size in the flow direction / the average bubble size in the thickness direction and the ratio of the average bubble size in the width direction / the average bubble size in the thickness direction are 5 or less. Thus, even if the tape is narrow, excellent conformability to the shape of an adherend, excellent shock resistance, and favorable rework properties can be achieved with this tape.

Description

technical field [0001] The present invention relates to an adhesive tape using a foam substrate. Background technique [0002] In portable electronic devices such as electronic notebooks, mobile phones, PHS, digital cameras, music players, TVs, notebook computers, game consoles, etc., it is used to protect the panels and surfaces of information display parts such as liquid crystal displays (LCDs) and organic EL displays (OELDs). Adhesive tapes are used to fix various members and components as represented by the lamination of housings. Many of these portable electronic devices are also provided with a waterproof function, and in these portable electronic devices, waterproofness is realized by an adhesive tape for fixing components. [0003] As an adhesive tape having waterproof performance, for example, an adhesive tape using a flexible foam as a base material is disclosed (see Patent Documents 1 to 2), and these adhesive tapes are disclosed to be thin and have good followab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J7/26
CPCC09J2203/318C09J2423/006C09J2203/326C09J7/0289C09J7/26Y10T428/249979C09J7/22C08J9/06C09J201/00
Inventor 小松崎优纪岩崎刚武井秀晃
Owner DIC CORP
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