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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 problems of expensive components, easy cracking, high requirements for reprocessing adaptability, Excellent impact resistance and anti-shedding effect

Active Publication Date: 2015-01-28
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, in addition to these characteristics, the components of portable electronic devices that promote high-functioning are often expensive. When the components are fixed and the portable electronic device fails after manufacture, it is suitable for reprocessing that can properly separate the fixed parts. sexually demanding
In particular, thin plate-shaped rigid bodies such as protective panels for information display units and image display modules are often expensive, but these plate-shaped rigid body parts have the problem of being prone to cracks and deformation during reprocessing
In addition, this problem has occurred more remarkably due to the enlargement of the screen of the information display part of the portable electronic device in recent years.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144] (Preparation of double-sided adhesive tape)

[0145] With respect to 100 parts by mass of the above adhesive composition (A), 0.89 parts by mass of "CORONATE L-45" (isocyanate-based crosslinking agent, 45% solid content) manufactured by Japan Polyurethane Co., Ltd. was added, stirred for 15 minutes, and then The release-treated surface of the 75 μm-thick PET film subjected to the release treatment was coated so that the thickness after drying would be 20 μm, and dried at 80° C. for 3 minutes to form a weak adhesive layer. The gel fraction of the weak adhesive layer was 87% by mass, and the temperature showing the peak of the loss tangent (tan δ) at a frequency of 1 Hz was -38°C.

[0146] Next, 1.1 parts by mass of "CORONATE L-45" (isocyanate-based crosslinking agent, 45% solid content) manufactured by Japan Polyurethane Co., Ltd. was added to 100 parts by mass of the above-mentioned adhesive composition (E), and stirred for 15 minutes. , on the peeling-treated surface ...

Embodiment 2

[0149] 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 is 45%) 0.67 mass parts, the material obtained is used for the weak adhesive layer, except that, with the same method as Example 1, a double-sided adhesive tape with a thickness of 145 μm was obtained. The gel fraction of the weak adhesive layer was 86% by mass, and the temperature showing the peak of the loss tangent (tan δ) at a frequency of 1 Hz was -36°C.

Embodiment 3

[0151] Using the adhesive composition (C) instead of the adhesive composition (A), with respect to 100 parts by mass of the adhesive composition (C), add "CORONATE L-45" (isocyanate-based crosslinking agent , solid content is 45%) 0.89 parts by mass, and the obtained material is used for the weak adhesive layer, except that, a double-sided adhesive tape with a thickness of 145 μm was obtained in the same manner as in Example 1. The gel fraction of the adhesive layer was 90% by mass, and the temperature showing the peak of the loss tangent (tan δ) at a frequency of 1 Hz was -31°C.

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Abstract

An adhesive tape which has an adhesive layer on at least one surface of a foam base. The foam base has a thickness of 300 mum or less and an interlaminar strength of 6-50 N / cm. The adhesive layer has a thickness of 50 mum or less, while having a 180° peel strength of 0.5-4 N / 20 mm at a peeling rate of 300 mm / min as measured in the form of an adhesive tape wherein the adhesive layer having a thickness of 25 mum is formed on a PET base having a thickness of 25 mum. This adhesive tape is capable of achieving good impact resistance and reworkability even in cases where the adhesive tape is thin.

Description

technical field [0001] The present invention relates to an adhesive tape using a foam base material. Background technique [0002] To protect liquid crystal displays (LCDs), organic Adhesive tapes are typically used for bonding panels and housings of information display units such as EL displays (OELDs), and for fixing various components and modules. [0003] As such an adhesive tape, for example, an adhesive tape using a flexible foam as a base material is disclosed (refer to Patent Documents 1 to 2). Component fixing for portable electronic devices. [0004] In recent years, high-functioning portable electronic devices, represented by smartphones, tablet PCs, notebook PCs, game consoles, and televisions, are advancing. These portable electronic devices tend to increase in volume along with higher functionality. Therefore, further thinning of adhesive tapes used in portable electronic devices is urgently required. In addition, since portable electronic devices are prone ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J201/00C09J7/26
CPCC09J201/00C09J2423/006C09J7/0289C09J2201/622C09J7/26Y10T428/24967C09J2301/312C09J7/20
Inventor 岩崎刚小松崎优纪武井秀晃
Owner DIC CORP