Air-permeable adhesive sheet and breathable product

Patent metadata

Field	Value
Publication number	US-11912908-B2
Application number	US-201917417232-A
Country	US
Kind code	B2
Filing date	Dec 23, 2019
Priority date	Dec 28, 2018
Publication date	Feb 27, 2024
Grant date	Feb 27, 2024

Abstract

An air-permeable adhesive sheet has air permeability in a thickness direction thereof and including an adhesive agent layer having first through holes extending in the thickness direction, wherein at least one surface of the adhesive agent layer forms an adhesive surface, the through holes have an average opening diameter of 1.0 to 50 μm and an average interval of 5 to 400 μm, and a variation in air permeability in the thickness direction is 22% or less as represented by a coefficient of variation of an air permeability measured according to Method B for air permeability measurement (Gurley method) specified in JIS L 1096: 2010, with an effective measurement area as a predetermined value selected from 0.5 to 2.0 mm2. The air-permeable adhesive sheet is a sheet capable of obtaining good characteristics such as air permeability even when being made into a sheet having a small area.

First claim

The invention claimed is:

1. An air-permeable adhesive sheet having air permeability in a thickness direction thereof, the air-permeable adhesive sheet comprising:
an adhesive agent layer having first through holes extending in the thickness direction, wherein
at least one surface of the adhesive agent layer forms an adhesive surface,
the through holes have an average opening diameter of 1.0 to 50 μm,
the through holes have an average interval of 5 to 400 μm, and
a variation in air permeability in the thickness direction is 22% or less as represented by a coefficient of variation of an air permeability measured according to Method B for air permeability measurement (Gurley method) specified in JIS L 1096: 2010, with an effective measurement area as a predetermined value selected from 0.5 to 2.0 mm 2 .

2. The air-permeable adhesive sheet according to claim 1 , wherein the air-permeable adhesive sheet is a doubled-sided adhesive sheet that is unprovided with a substrate and in which each of both surfaces of the adhesive agent layer forms an adhesive surface.

3. The air-permeable adhesive sheet according to claim 1 , further comprising a substrate having second through holes extending in the thickness direction, wherein
the adhesive agent layer is disposed on a surface on one side of the substrate or on surfaces on both sides of the substrate, and
the first through holes and the second through holes communicate with each other.

4. The air-permeable adhesive sheet according to claim 3 , wherein the substrate includes polyethylene terephthalate or polyimide.

5. The air-permeable adhesive sheet according to claim 1 , wherein a peeling liner is disposed on the adhesive surface.

6. The air-permeable adhesive sheet according to claim 1 , wherein the air-permeable adhesive sheet has an area of 100 mm 2 or less.

7. The air-permeable adhesive sheet according to claim 1 , wherein the air-permeable adhesive sheet has a thickness of 10 to 100 μm.

8. The air-permeable adhesive sheet according to claim 1 , wherein the adhesive agent layer includes an ultraviolet absorber.

9. The air-permeable adhesive sheet according to claim 1 , wherein the adhesive agent layer is an acrylic adhesive agent layer or a silicone adhesive agent layer.

10. The air-permeable adhesive sheet according to claim 1 , wherein the air-permeable adhesive sheet is for a breathable adherend having breathability in an attachment surface to which the air-permeable adhesive sheet is to be attached.

11. The air-permeable adhesive sheet according to claim 1 , wherein the air-permeable adhesive sheet is for a micro electro mechanical system (MEMS).

12. A breathable product having a surface with an opening and having breathability through the opening in the surface, the breathable product further comprising:
an air-permeable adhesive sheet attached to the surface so as to cover the opening, wherein
the air-permeable adhesive sheet is the air-permeable adhesive sheet according to claim 1 .

13. A breathable product comprising a porous substrate and an air-permeable adhesive sheet attached to a surface of the porous substrate, wherein
the air-permeable adhesive sheet is the air-permeable adhesive sheet according to claim 1 .

Assignees

• Nitto Denko Corp

Inventors

• Yamamoto Hajime
• Kigami Hiroki
• Aizuka Marie

Classifications

• C09J7/10 Primary

  without carriers · CPC title

• C09J7/24

  based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds · CPC title

• C09J7/25

  based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds · CPC title

• C09J7/20 Primary

  characterised by their carriers · CPC title

• C09J7/38 Primary

  Pressure-sensitive adhesives [PSA] · CPC title