Anisotropic heat conductive composition

Patent metadata

Field	Value
Publication number	US-9512289-B2
Application number	US-201414303839-A
Country	US
Kind code	B2
Filing date	Jun 13, 2014
Priority date	Jun 25, 2013
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

An object of the present invention is to provide an anisotropic heat conductive composition comprising: resin; and graphite fillers dispersed into the resin, wherein the graphite fillers each have a maximum diameter A in parallel with a basal plane of each of the graphite fillers and a maximum length C perpendicular to the basal plane, an average of the maximum diameters A ranges from 1 μm to 300 μm, an average ratio of the maximum diameter A to the maximum length C represented by A/C is at least 30, a content of the graphite fillers is 20 mass % to 40 mass %, and an average of a smaller angle made by the basal plane and a sheet surface of the sheet anisotropic heat conductive composition is less than 15°.

First claim

What is claimed is:

1. A sheet anisotropic heat conductive composition, comprising:
resin;
graphite fillers dispersed into the resin; and
an elastomer,

wherein
the graphite fillers each have a maximum diameter A in parallel with a basal plane of each of the graphite fillers, a maximum diameter B in parallel with the basal plane and perpendicular to the maximum diameter A, and a maximum length C perpendicular to the basal plane,
an average of the maximum diameters A ranges from 1 μm to 300 μm,
an average ratio of the maximum diameter A to the maximum length C represented by A/C is at least 30,
a content of the graphite fillers is 20 mass % to 40 mass %, and
an average of a smaller angle made by the basal plane and a sheet surface of the sheet anisotropic heat conductive composition is 1° or more and less than 15°,
an average ratio of the maximum diameter A to the maximum diameter B represented by A/B ranges from 1 to 20.

2. The anisotropic heat conductive composition according to claim 1 , wherein the graphite fillers are obtained by heat-treating a high-polymer film.

3. The anisotropic heat conductive composition according to claim 2 , wherein the high-polymer film is 10 μm to 400 μm in thickness.

4. The anisotropic heat conductive composition according to claim 2 , wherein the high-polymer film is 10 μm to 20 μm in thickness.

5. The anisotropic heat conductive composition according to claim 1 , wherein an average of the smaller angle made by the basal plane and the sheet surface of the sheet anisotropic heat conductive composition is 7° or more and 10° or less.

6. The anisotropic heat conductive composition according to claim 1 , wherein a content of the graphite fillers is 30 mass % to 40 mass %.

Assignees

• Panasonic Corp
• Panasonic Ip Man Co Ltd

Inventors

• Tanaka Atsushi
• Nishiki Naomi
• Nishikawa Kazuhiro
• Kitaura Hidetoshi
• Nakaya Kimiaki
• Nawa Honami

Classifications

• C08K2201/003

  Additives being defined by their diameter · CPC title

• C08K3/04 Primary

  Carbon · CPC title

• C08K2201/004

  Additives being defined by their length · CPC title