Adhesive compositions comprising electrically insulating-coated carbon-based particles and methods for their use and preparation

Patent metadata

Field	Value
Publication number	US-9469790-B2
Application number	US-56961609-A
Country	US
Kind code	B2
Filing date	Sep 29, 2009
Priority date	Sep 29, 2009
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

Adhesive compositions that contain thermally conductive carbon-based materials that are also electrically insulated; methods for using such adhesive compositions and methods for their preparation.

First claim

What is claimed is:

1. An adhesive composition suitable for use as a thermal conductor for electronic components, the composition comprising a first plurality of carbon-based particles and a second plurality of carbon-based particles, the first plurality of carbon-based particles having an electrically-insulating coating having a thickness of at least about 10 nanometers extending over the carbon-based particles of the first plurality such that a continuous coating of electrically-insulating material is formed, and the second plurality of carbon-based particles uncoated with the electrically-insulating coating, wherein a ratio of the first and second pluralities of carbon-based particles in the adhesive composition is selected to ensure an electrical conductivity of the adhesive composition is less than a predetermined threshold, the first plurality of carbon-based particles of the adhesive composition having an electrical resistance of at least 50 ohms*cm and comprising at least about 10 percent of the adhesive composition by weight.

2. An adhesive composition as set forth in claim 1 wherein the carbon-based particles are in a shape selected from platelets, fibers, spheres, flakes, tubes, rods, diamonds and combinations thereof.

3. An adhesive composition as set forth in claim 1 wherein the carbon-based particles comprise carbon fiber.

4. An adhesive composition as set forth in claim 1 wherein the carbon-based particles comprise graphitic carbon.

5. An adhesive composition as set forth in claim 4 wherein the graphitic carbon is a material selected from carbon fibers, graphite, exfoliated graphite, graphene and combinations thereof.

6. An adhesive composition as set forth in claim 1 wherein the adhesive composition is a paste.

7. An adhesive composition as set forth in claim 1 wherein the electrically-insulating coating is selected from ceramics and diamond-like carbon.

8. An adhesive composition as set forth in claim 1 wherein the electrically-insulating coating is a ceramic selected from the group consisting of metal oxides, metal nitrides, metal carbides and combinations thereof.

9. An adhesive composition as set forth in claim 1 wherein the electrically-insulating coating is a ceramic selected from boron carbide, boron nitride, silicon carbide and silicon nitride.

10. An adhesive composition as set forth in claim 1 wherein the carbon-based particles are entirely coated with the electrically-insulating coating.

11. An adhesive composition as set forth in claim 1 further comprising a binder.

12. An adhesive composition as set forth in claim 11 wherein the binder is selected from epoxies, polyurethanes, acrylics and combinations thereof.

Assignees

• Gross Adam Franklin
• Cumberland Robert W
• Moss Randall J
• Boeing Co

Inventors

• Gross Adam Franklin
• Cumberland Robert W
• Moss Randall J

Classifications

• C09J163/00

  Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins · CPC title

• B29K2105/0097

  Glues or adhesives, e.g. hot melts or thermofusible adhesives · CPC title

• C08K7/06

  Elements · CPC title

• C08K3/04

  Carbon · CPC title

• C09J9/00

  Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks (C09J7/00 takes precedence) · CPC title