double sided adhesive tape

An adhesive tape, double-sided technology, applied in adhesives, film/sheet adhesives, synthetic resin layered products, etc., can solve the problems of insufficient curing speed, adhesion, and wrinkles of the printing layer, and achieve easy adjustment, Easy to manufacture, hard to yellow effect

Active Publication Date: 2021-12-28
TERAOKA SEISAKUSHO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the knowledge of the inventors of the present invention, if such a binder resin and curing agent are used, the curing speed of the printed layer is insufficient, so blocking and wrinkles may occur as described above.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0063] Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to these Examples. In the following description, "parts" are "parts by mass".

[0064]

[0065] With respect to 100 parts of the binder resin shown in Tables 1 and 2, 13.0 parts of the curing agent were mixed to obtain binder resin compositions 1 to 3 and comparative binder resin compositions C1 to C7. Among the glass transition temperatures (Tg) described in the tables, the Tg of the binder resin b1 is a DSC measurement value, and the glass transition temperatures (Tg) of the binder resins b2 to b5 are values ​​obtained from manufacturer information.

[0066] (adhesion test)

[0067] On one side of a transparent PET (polyethylene terephthalate) film having a thickness of 12 μm, the adhesive resin composition was laminated so as to have a thickness of 5 μm to obtain an adhesive coating film with a total thickness of 17 μm. The pressure-sensitive adhesive coating fil...

Embodiment 2

[0101] (Preparation of laminate base material B)

[0102] Except having used the transparent PET film of thickness 6 micrometers, it carried out similarly to the laminated base material A of Example 1, and produced the laminated base material B of total thickness 17 micrometers.

[0103] (Production of double-sided adhesive tape)

[0104] A double-sided adhesive tape with a total thickness of about 60 μm was produced in the same manner as in Example 1 except that the thickness of the adhesive layer was changed to 21 μm using the laminated base material B.

[0105]

[0106] (Preparation of black ink composition 2)

[0107] In addition to using the same aliphatic isocyanate-based curing agent (manufactured by Toyo Ink Co., Ltd., trade name LP Hardener) as the curing agent (al-i) in Comparative Adhesive Resin Composition C1, the black Ink composition 1 was carried out similarly, and black ink composition 2 was prepared.

[0108] (Preparation of laminate base material C)

[...

Embodiment 1 and Embodiment 2

[0121] Regarding Example 1, Example 2, and Comparative Example 1, the static friction force (transparent PET film of the laminated base material to the black printed layer of the laminated base material) was measured by a test method in accordance with JIS K 7125. Specifically, the laminated base material was fixed to the test bench so that the transparent PET film side faced upward. On the other hand, another laminated base material (size: 25 mm×25 mm) was fixed to a slide sheet weighing 200 g. Then, the slide sheet is quietly placed on the test bench in such a way that the transparent PET film surface of the laminate substrate fixed on the test bench is in contact with the black printing layer of the laminate substrate fixed on the slide sheet, at a speed of 300mm / The slide is moved in parallel for 1 minute, and the maximum stress (static friction force) initially obtained is measured. In addition, regarding Comparative Example 2, the static friction force of the white pri...

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Abstract

The invention discloses an adhesive tape, which is a double-sided adhesive tape comprising a laminated base material and adhesive layers (4) provided on both sides of the laminated base material. The laminated base material has a resin film (1) and a black printing layer (3) There is at least one bright-color printing layer (2) in between, characterized in that the above-mentioned black printing layer (3) contains a structure derived from an aromatic isocyanate-based curing agent; the double-sided adhesive tape is difficult to produce laminated substrates Adhesive layer (4) on the side of the light reflection layer is hard to yellow due to blocking and wrinkles, and it is easy to adjust the brightness (reflectivity) of the light reflection layer, so it is useful for fixing the liquid crystal display panel and the backlight unit.

Description

technical field [0001] The present invention relates to a double-sided adhesive tape having both functions of light reflection and light-shielding properties, which improves the brightness of the backlight surface of liquid crystal display devices used in mobile phones, touch panels, etc., and prevents the decrease in visibility due to light leakage is useful. Background technique [0002] In a liquid crystal display device used in a mobile phone, a touch panel, or the like, a double-sided adhesive tape is provided between the liquid crystal display unit and the backlight unit to fix these two members. This double-sided adhesive tape has, for example, a white light-reflecting layer and a black light-shielding layer, and contributes to improving the brightness of the backlight surface and preventing deterioration of visibility due to light leakage from the backlight. Such double-sided adhesive tapes contributing to both the improvement of brightness and light-shielding prope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J7/20B32B27/00B32B27/40C09J201/00
CPCB32B27/00B32B27/40C09J201/00C09J7/20C09J7/29C09J2203/318
Inventor 小井沼武夫中西佐知男布施贵志草野大地
Owner TERAOKA SEISAKUSHO
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