# US 5,348,686 A · Electrically conductive gel

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- Number: US 5,348,686 A
- Document ID: US5348686A
- Status: Granted
- Kind: A
- Application number: 08/123,595
- Filed: 1993-09-20
- Granted: 1994-09-20
- Earliest claimed: 1992-06-22
- Assignees: The Whitaker Corporation
- Inventors: Navin N. Vyas
- Web page: https://patentgrep.com/patent/US5348686A

## CPC

- H05K 3/325: by abutting or pinching; Mechanical auxiliary parts therefor
- C08K 13/04: Ingredients characterised by their shape and organic or inorganic ingredients
- C08L 83/04: Polysiloxanes
- H01B 1/22: the conductive material comprising metals or alloys
- C08G 77/20: containing silicon bound to unsaturated aliphatic groups
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

The invention relates to an electrically conductive silicone gel having a combination of conductive particles comprising silver coated mica and oxide free silver flakes uniformly dispersed therethrough, where said gel is characterized as non-flowing, self-healing, and thermally stable, with a volume resistivity of less than about 2.0 milliohm-cm.

## Claims

### Claim 1

An electrically conductive silicone gel having a combination of conductive particles comprising silver coated mica and silver flakes uniformly dispersed therethrough, where said particles are present, by weight, in an amount between 60 and 75%, and gel is characterized as non-flowing, self-healing, and thermally stable, with a volume resistivity of less than about 2.0 milliohm-cm.

### Claim 2 (depends on 1)

The electrically conductive silicone gel according to claim 1 wherein the ratio of silver flakes to silver coated mica is about 2:1.

### Claim 3 (depends on 1)

The electrically conductive silicone gel according to claim 1 wherein said silicone gel is a crosslinked polysiloxane polymer.

### Claim 4 (depends on 3)

The electrically conductive silicone gel according to claim 3 wherein said silicone gel is a vinyl terminated poly-dimethyl siloxane cross-linked with a flexible cross-linker, which has been mediated by a dichlorodicarbonyl platinum (II) catalyst.

### Claim 5 (depends on 1)

The electrically conductive silicone gel according to claim 1 wherein said silver flakes are cleaned and etched prior to their dispersion within said gel.

### Claim 6 (depends on 5)

The electrically conductive silicone gel according to claim 5 wherein said etched silver flakes exhibit a roughened surface to enhance the contact between adjacent silver flakes and silver coated mica.

### Claim 7 (depends on 1)

The electrically conductive silicone gel according to claim 1 wherein said gel and conductive particles are mixed in an essentially air-free atmosphere.