ELECTROCONDUCTIVE PRESSURE-SENSITIVE ADHESIVE CUSHIONING

• US 20160121576A1
• Filed: 10/30/2015
• Published: 05/05/2016
• Est. Priority Date: 11/04/2014
• Status: Abandoned Application

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: SASAKI, Shu, SAITOU, Makoto, KODAMA, Kiyoaki, FUJITA, Masato
• Application Number:
  US14/927,870
• Publication Number:
  US 20160121576A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B32B 15/046 of foam
• CPC Class Codes: B32B 15/08 of synthetic resin
• CPC Class Codes: B32B 15/12 of paper or cardboard
• CPC Class Codes: B32B 15/14 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 15/18 comprising iron or steel B32B15/011, B32B15/012 and B32B15/013 take precedence
• CPC Class Codes: B32B 15/20 comprising aluminium or copper B32B15/016 and B32B15/017 take precedence
• CPC Class Codes: B32B 2262/106 Carbon fibres, e.g. graphite fibres
• CPC Class Codes: B32B 2264/108 Carbon, e.g. graphite particles
• CPC Class Codes: B32B 2266/02 Organic
• CPC Class Codes: B32B 2266/0214 Materials belonging to B32B27/00
• CPC Class Codes: B32B 2266/0228 Aromatic vinyl resin, e.g. styrenic (co)polymers
• CPC Class Codes: B32B 2266/025 Polyolefin
• CPC Class Codes: B32B 2266/0257 Polyamide
• CPC Class Codes: B32B 2266/0264 Polyester
• CPC Class Codes: B32B 2266/0278 Polyurethane
• CPC Class Codes: B32B 2266/0292 Thermoplastic elastomer
• CPC Class Codes: B32B 2266/06 Open cell foam
• CPC Class Codes: B32B 2266/08 Closed cell foam
• CPC Class Codes: B32B 2266/104 Micropores, i.e. with average diameter in the range from 0.1 µm to 0.1 mm
• CPC Class Codes: B32B 2270/00 Resin or rubber layer containing a blend of at least two different polymers
• CPC Class Codes: B32B 2307/202 : Conductive
• CPC Class Codes: B32B 2307/212 : Electromagnetic interference shielding
• CPC Class Codes: B32B 2307/514 : Oriented
• CPC Class Codes: B32B 2307/56 : Damping, energy absorption
• CPC Class Codes: B32B 2307/72 : Density
• CPC Class Codes: B32B 2307/748 : Releasability
• CPC Class Codes: B32B 2405/00 : Adhesive articles, e.g. adhesive tapes
• CPC Class Codes: B32B 2457/208 : Touch screens
• CPC Class Codes: B32B 27/12 : next to a fibrous or filamentary layer
• CPC Class Codes: B32B 27/281 : comprising polyimides
• CPC Class Codes: B32B 27/304 : comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
• CPC Class Codes: B32B 27/32 : comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 27/322 : comprising halogenated polyolefins, e.g. PTFE
• CPC Class Codes: B32B 27/36 : comprising polyesters
• CPC Class Codes: B32B 27/365 : comprising polycarbonates
• CPC Class Codes: B32B 29/02 : next to a fibrous or filamentary layer
• CPC Class Codes: B32B 3/30 : characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs apertured layer B32B3/266; layer with cavities or internal voids B32B3/26
• CPC Class Codes: B32B 5/022 : Non-woven fabric
• CPC Class Codes: B32B 5/18 : characterised by features of a layer of foamed material
• CPC Class Codes: B32B 5/22 : characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed layer formed of natural mineral fibres or particles next to a foam layer B32B19/047, next to a layer made of particles B32B19/048, or next to a fibrous or filamentary layer B32B19/06; paper layer or cardboard layer next to a paper layer or cardboard layer B32B29/005, next to a foam layer B32B29/007, next to a fibrous or filamentary layer B32B29/02, or next to a particulate layer B32B29/04
• CPC Class Codes: B32B 5/245 : another layer next to it being a foam layer
• CPC Class Codes: B32B 5/26 : another layer next to it also being fibrous or filamentary relative arrangement of fibres or filaments of different layers B32B5/12
• CPC Class Codes: B32B 7/06 : permitting easy separation
• CPC Class Codes: B32B 7/12 : using interposed adhesives or interposed materials with bonding properties

Abstract

An electroconductive pressure-sensitive adhesive cushioning member includes an electroconductive resin foam layer, an electroconductive composite layer, and an electroconductive intermediate layer disposed between the electroconductive resin foam layer and the electroconductive composite layer. The electroconductive composite layer includes an electroconductive base layer and an electroconductive attachment layer disposed on a surface of the electroconductive base layer and having an attachment surface to be attached to an obstacle. Thus, the electroconductive cushioning member is excellent in conductivity, an electromagnetic waves shieling property, and a cushioning property.

Claims

1. An electroconductive pressure-sensitive adhesive cushioning member comprising:

an electroconductive resin foam layer;

an electroconductive composite layer including an electroconductive base layer and an electroconductive attachment layer, the electrocoductive attachment layer being disposed on a surface of the electroconductive base layer and having an attachment surface to be attached to an obstacle; and

an electroconductive intermediate layer disposed between the electroconductive resin foam layer and the electroconductive composite layer.

2. The electroconductive pressure-sensitive adhesive cushioning member according to claim 1, wherein the electroconductive base layer included in the electrocouductive composite layer is made of an electroconductive non-woven cloth or a metal foil.

3. The electroconductive pressure-sensitive adhesive cushioning member according to claim 1, wherein

the electroconductive base layer is made of a metal foil,

the electroconductive attachment layer is a pressure-sensitive adhesive layer disposed on a surface of the metal foil, and

the electroconductive base layer includes a terminal portion that is formed of a part of the metal foil and is through the pressure-sensitive adhesive layer.

4. The electroconductive pressure-sensitive adhesive cushioning member according to claim 1, wherein the electroconductive intermediate layer includes an adhesive agent and electroconductive filler.

5. The electroconductive pressure-sensitive adhesive cushioning member according to claim 1, wherein the electroconductive resin foam layer has a volume resistivity of 10¹⁰ Ω

·

cm or less and a repulsive load of 5 N/cm² or less at 50% compression.

6. The electroconductive pressure-sensitive adhesive cushioning member according to claim 1, wherein the electroconductive resin foam layer has a surface resistivity of 10¹⁰Ω

per square or less.

7. The electroconductive pressure-sensitive adhesive cushioning member according to claim 1, wherein the electroconductive resin foam layer has an expansion ratio of 9 times or more.

8. The electroconductive pressure-sensitive adhesive cushioning member according to claim 1, wherein the electroconductive resin foam layer has an apparent density of from 0.01 g/cm³ to 0.15 g/cm³.

9. The electroconductive pressure-sensitive adhesive cushioning member according to claim 1, wherein the electroconductive resin foam layer has an average cell diameter of from 10 μ

m to 250 μ

m.

10. The electroconductive pressure-sensitive adhesive cushioning member according to claim 1, wherein the electroconductive resin foam layer is formed of a resin composition containing resin and an electroconductive material

11. The electroconductive pressure-sensitive adhesive cushioning member according to claim 10, wherein the electroconductive material is carbonaceous filler.

12. The electroconductive pressure-sensitive adhesive cushioning member according to claim 10, wherein the resin is thermoplastic resin.

13. The electroconductive pressure-sensitive adhesive cushioning member according to claim 1, wherein

the electroconductive resin foam layer includes thermoplastic resin and carbonaceous filler,

the carbonaceous filler has a BET specific surface area of 500 m²/g and is present in an amount of 3 to 20 parts by mass per 100 parts by mass of the thermoplastic resin, and

the electroconductive resin foam layer has an average cell diameter of from 10 μ

m to 250 μ

m, and an apparent density of from 0.01 g/cm³ to 0.15 g/cm³.

14. The electroconductive pressure-sensitive adhesive cushioning member according to claim 1, wherein the electroconductive resin foam layer has a closed cell structure or semiopen/semiclosed cell structure.

15. The electroconductive pressure-sensitive adhesive cushioning member according to claim 1, wherein the electroconductive resin foam layer is formed via a process in which a resin composition including resin and an electroconductive material is impregnated with a high-pressure inert gas and decompressed after impregnation of the high-pressure inert gas.

16. The electroconductive pressure-sensitive adhesive cushioning member according to claim 1, wherein

the electroconductive resin foam layer includes a resin composition containing thermoplastic resin and carbonaceous filler, the resin composition in which the carbonaceous filler has a BET specific surface area of 500 m²/g and is present in an amount of 3 to 20 parts by mass per 100 parts by mass of the thermoplastic resin, and

the electroconductive resin foam layer is formed via a process in which the resin composition is impregnated with a high-pressure inert gas and decompressed after impregnation of the high-pressure inert gas.

17. The electroconductive pressure-sensitive adhesive cushioning member according to claim 15, wherein inert gas is carbon dioxide.

18. The electroconductive pressure-sensitive adhesive cushioning member according to claim 15, wherein inert gas is in a supercritical state.

19. The electroconductive pressure-sensitive adhesive cushioning member according to claim 1, wherein the electroconductive composite layer projects outwardly from the electroconductive resin foam layer.