Gas sensing element

Patent metadata

Field	Value
Publication number	US-10996174-B2
Application number	US-201816070068-A
Country	US
Kind code	B2
Filing date	Feb 17, 2018
Priority date	Feb 17, 2017
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

A gas sensing element includes a gas detection layer including a pigment, the gas detection layer including a first surface; and a backing material disposed on the first surface of the gas detection layer. When reducing gas causes the gas sensing element to change in color, a color change ΔL* of the gas sensing element is greater than or equal to 5.

First claim

The invention claimed is:

1. An adhesive tape comprising:
a gas detection layer including a pigment, the gas detection layer including a first surface; and
a backing material disposed on the first surface of the gas detection layer, wherein
when reducing gas causes the adhesive tape to change in color, a color change ΔL*of the adhesive tape is greater than or equal to 5,
the gas detection layer includes a pressure sensitive adhesive having an adhesive force such that, upon the gas detection layer being pressed against a target other than the adhesive tape itself, the adhesive tape is adhered to the target by the adhesive force of the pressure sensitive adhesive, and
a gas permeability of the backing material is lower than a gas permeability of the gas detection layer.

2. The adhesive tape of claim 1 , farther comprising:
a diffusion part where the reducing gas is diffused, on a second surface of the gas detection layer opposite to the first surface of the gas detection layer.

3. The adhesive tape of claim 2 , further comprising:
a spacer for forming the diffusion part, the spacer being set on the second surface of the gas detection layer.

4. The adhesive tape of claim 3 , wherein the spacer has a thickness of 5 μm to 10 mm.

5. The adhesive tape of claim 3 , wherein the spacer is formed of paper, a non-woven, an adhesive layer, a foam, or a porous film, or a fibrous film.

6. The adhesive tape of claim 1 , wherein the reducing gas includes at least one of hydrogen, hydrogen sulfide, carbon monoxide, methane, formaldehyde, acetylene, sulfur dioxide, and nitrous oxide.

7. The adhesive tape of claim 1 , wherein the pigment includes a chemochromic composition.

8. The adhesive tape of claim 1 , wherein the pigment irreversibly changes in color, by contacting reducing gas.

9. The adhesive tape of claim 1 , the gas detection layer further comprising carrier particles having a surface, the pigment including a palladium oxide, palladium hydroxide, or palladium salts on the surfaces of carrier particles.

10. The adhesive tape of claim 9 , wherein a noble metal other than palladium is supported or loaded, on the surfaces of the carrier particles.

11. The adhesive tape of claim 9 , wherein the carrier particles include titanium oxide.

12. The adhesive tape of claim 1 , wherein the pressure sensitive adhesive includes an acrylic pressure sensitive adhesive, a silicone-based pressure sensitive adhesive, an urethane-based pressure sensitive adhesive, or a rubber-based pressure sensitive adhesive.

13. The adhesive tape of claim 12 , wherein the silicone-based pressure sensitive adhesive includes a methylphenylsiloxy group or a dimethylsiloxy group.

14. The adhesive tape of claim 1 , wherein the backing material includes polyimide; polyethylene; fluoro carbon polymer such as fluorinated ethylene propylene copolymer (FEP), ethylene tetrafluoroethylene copolymer (ETFE), poly tetra fluoro ethylene (PTFE), or tetra fluoro ethylene hexa fluoro propylene copolymer (PFA); or polyethylene terephthalate (PET) which contains IN absorber or hindered amine light stabilizers (HALS).

15. The adhesive tape of claim 1 , wherein the adhesive tape is rolled up into a bundle roll-shape.

16. The adhesive tape of claim 1 , wherein the gas detection layer has a release liner on a finished product or on a product that is in process of production.

17. The adhesive tape of claim 1 , wherein the gas detection layer has a thickness of 10 μm to 100 μm.

18. The adhesive tape of claim 1 , wherein the gas detection layer has an adhesion of greater than or equal to 0.2 N/25 mm.

19. The adhesive tape of claim 1 , wherein
a chroma of the color difference ΔC* of the adhesive tape before and after a color reaction, is greater than or equal to 3:
the chroma of the color difference ΔC*is obtained by
Δ C*=|C* final −C* initial|,

where C* initial represents a chroma of the color of the adhesive tape before use, and C* final represents the chroma of the color of the adhesive tape after the color reaction.

Assignees

• Nitto Denko Corp

Inventors

• Nakamura Koichi
• Mohajeri Nahid
• Chen Yu-Chu
• Bizati Kujtim
• Inokuchi Shinji
• Suzuki Namiko
• Higuchi Hiroyuki
• Hirose Masahiko
• Nishigawara Masaya

Classifications

• G01N33/005 Primary

  H2 · CPC title

• G01N31/223 Primary

  for investigating presence of specific gases or aerosols (G01N31/221, G01N31/222 take precedence; actuation of fire alarm by presence of smoke or gases G08B17/10) · CPC title

• G01N21/783 Primary

  for analysing gases · CPC title

• G01M3/22

  for pipes, cables or tubes; for pipe joints or seals; for valves; {for welds; for containers, e.g. radiators} · CPC title

• G01D7/00

  Indicating measured values · CPC title