Pressure-sensitive electric conductive sheet material

• US 4,258,100 A
• Filed: 09/06/1978
• Issued: 03/24/1981
• Est. Priority Date: 09/09/1977
• Status: Expired due to Term

• Current Assignee: Kyowa Kabushiki Kaisha
• Original Assignee: Kyowa Kabushiki Kaisha
• Inventors: Fujitani, Takeo, Matsuoka, Kajio
• Primary Examiner(s): VAN BALEN, WILLIAM
• Application Number:
  US05/940,058
• Time in Patent Office: 930 Days
• Field of Search: 427/123, 428/306, 428/242, 428/309, 428/263, 428/313, 428/281, 428/315, 428/283, 428/328, 428/553, 428/329, 428/558, 428/343, 428/560, 428/344, 428/562, 428/355, 428/563, 428/356 , 428/922, 428/367, 428/354, 228/214, 219/91.21, 338/114, 252/513, 252/514
• US Class Current: 428/316.6
• CPC Class Codes: B23K 35/226 Non-corrosive coatings; Primers applied before welding
• CPC Class Codes: B32B 2264/105 Metal
• CPC Class Codes: B32B 25/10 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 5/245 another layer next to it being a foam layer
• CPC Class Codes: G01L 1/20 by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids of piezo-resistive materials G01L1/18; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
• CPC Class Codes: H01B 1/22 the conductive material comprising metals or alloys
• CPC Class Codes: H01H 1/029 comprising conducting material dispersed in an elastic support or binding material
• CPC Class Codes: Y10T 428/249981 Plural void-containing components
• CPC Class Codes: Y10T 428/249983 As outermost component
• CPC Class Codes: Y10T 428/249986 Void-containing component contains also a solid fiber or solid particle
• CPC Class Codes: Y10T 428/256 Heavy metal or aluminum or compound thereof
• CPC Class Codes: Y10T 428/2848 Three or more layers
• CPC Class Codes: Y10T 428/2857 including metal or compound thereof or natural rubber

Abstract

Pressure-sensitive electric conductive sheet material is provided, which comprises at least one layer of a rubbery elastic material wherein are substantially uniformly distributed fine particles of electric conductive metal.

Claims

1. A pressure-sensitive electric conductive sheet material comprising at least one layer of rubbery elastic material and an adhesive layer disposed on at least one of the surfaces of said sheet, both layers having substantially uniformly distributed fine particles of electric conductive metal, the quantity and size of said metal particles being such that the electrical conductivity of said sheet is sensitive to pressure.

2. A pressure-sensitive electric conductive sheet material according to claim 1, wherein said layer of rubbery elastic material is foamed.

3. A pressure-sensitive electric conductive sheet material according to claim 1 or 2 further comprising a fibrous supporting layer attached to at least one surface of said layer of rubbery elastic material.

4. A pressure-sensitive electric conductive sheet material according to claim 1 or 2 wherein the amount of the metal particles is 10 to 800 parts by weight per 100 parts by weight of the rubbery elastic material.

5. A pressure-sensitive electric conductive sheet material according to claim 1 or 2 wherein the amount of the metal particles is 300-600 parts by weight per 100 parts by weight of the rubbery elastic material.

6. A pressure-sensitive electric conductive sheet material according to claim 1 wherein the particle size of the fine metal particles is 10 to 1,000 mesh.

7. A pressure-sensitive electric conductive sheet material according to claim 1 wherein the particle size is 50 to 300 mesh.

8. A pressure-sensitive electric conductive sheet material according to claims 1 or 2 wherein the amount of the metal particles in said adhesive layer is 10 to 100 parts by weight per 100 parts by weight of said adhesive layer.

9. A pressure-sensitive electric conductive sheet material according to claim 2 wherein the metal particle size is 10 to 1,000 mesh.

10. A pressure-sensitive electric conductive sheet material according to claim 3 wherein the amount of the metal particles is 10 to 800 parts by weight per 100 parts by weight of the rubbery elastic material.

11. A pressure-sensitive electric conductive sheet material according to claim 3, including two layers of said rubbery elastic material and said fiberous supporting layer disposed between said rubbery elastic layers and further comprising two adhesive layers wherein are substantially uniformly distributed fine particles of electric conductive metal, said adhesive layers disposed on the outer surfaces of said rubbery elastic layers.

12. A pressure-sensitive electric conductive sheet material according to claim 11 wherein the amount of the metal particles in said adhesive layer is 10 to 100 parts by weight per 100 parts by weight of said adhesive layer.

13. A pressure-sensitive electric conductive sheet material according to claim 12 wherein the metal particle size is 10 to 1,000 mesh.

14. A pressure-sensitive electric conductive sheet material according to claim 12 wherein the amount of the metal particles is 300-600 parts by weight per 100 parts by weight of the rubbery elastic material.