Impact-absorbing pressure-sensitive adhesive sheet and method of producing the same

Patent metadata

Field	Value
Publication number	US-9657198-B2
Application number	US-201414470058-A
Country	US
Kind code	B2
Filing date	Aug 27, 2014
Priority date	Aug 3, 2006
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

An impact-absorbing pressure-sensitive adhesive sheet according to an embodiment of the present invention includes an impact-absorbing pressure-sensitive adhesive layer including an impact-absorbing layer. A side surface of the impact-absorbing pressure-sensitive adhesive layer includes a tapered surface; and the tapered surface has a taper angle of 65° or more.

First claim

What is claimed is:

1. A method of producing an impact-absorbing pressure-sensitive adhesive sheet, the method comprising:
providing an impact-absorbing pressure-sensitive adhesive layer having therein an impact-absorbing layer, the impact-absorbing pressure-sensitive adhesive layer being formed on one side of a substrate;
irradiating the impact-absorbing pressure-sensitive adhesive layer with laser light for cutting so as to form a fully-cut edge of the impact-absorbing pressure-sensitive adhesive layer on the substrate such that the layer becomes separable from the fully-cut edge from the substrate, wherein:
a cut surface of said cut edge of the impact-absorbing pressure-sensitive adhesive layer includes a tapered surface; and
the tapered surface has a taper angle of 65° or more.

2. The method of producing an impact-absorbing pressure-sensitive adhesive sheet according to claim 1 , wherein said cutting with laser light forms adjacent cut surfaces of the impact-absorbing pressure-sensitive adhesive layer, and a distance between the adjacent cut surfaces is 30 μm or more.

3. The method of producing an impact-absorbing pressure-sensitive adhesive sheet according to claim 1 , wherein the laser light includes light having a wavelength of at least one of 400 nm or less and/or 1.5 μm or more.

4. The method of producing an impact-absorbing pressure-sensitive adhesive sheet according to claim 1 , wherein the laser comprises CO 2 laser.

5. The method of producing an impact-absorbing pressure-sensitive adhesive sheet according to claim 1 , wherein the impact-absorbing pressure-sensitive adhesive layer is cut to provide a plurality of impact-absorbing pressure-sensitive adhesive pieces each having an impact-absorbing layer on the one side of the substrate.

6. The method of producing an impact-absorbing pressure-sensitive adhesive sheet according to claim 1 , wherein the sheet further comprises an optical layer which is cut together with the impact-absorbing pressure-sensitive adhesive layer.

7. The method of producing an impact-absorbing pressure-sensitive adhesive sheet according to claim 1 , wherein the optical layer comprises a polarizing plate or an optical compensation film.

Assignees

• Nitto Denko Corp

Inventors

• Noguchi Tomonori
• Hino Atsushi
• Nishida Kanji
• Kitada Kazuo
• Amano Takaichi

Classifications

• Y10T428/14

  Layer or component removable to expose adhesive · CPC title

• C09J9/00 Primary

  Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks (C09J7/00 takes precedence) · CPC title

• C09J7/02

  Chemistry & Metallurgy · mapped topic

• B23K26/38

  by boring or cutting · CPC title

• Y10T428/28

  Web or sheet containing structurally defined element or component and having an adhesive outermost layer · CPC title