Heat conductor and device including the same

Patent metadata

Field	Value
Publication number	US-9746259-B2
Application number	US-201514713306-A
Country	US
Kind code	B2
Filing date	May 15, 2015
Priority date	May 16, 2014
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

A heat conductor includes a first layer containing a first resin component and first flake graphite fillers each having a basal plane; and a second layer containing a second resin component and second flake graphite fillers each having a basal plane. The heat conductor is a laminate including the first layer and the second layer, an average of first angles in the first layer is 35 degrees or smaller, each of the first angles is an acute angle between the basal plane of a corresponding one of the first flake graphite fillers and a first laminated surface of the laminate, an average of second angles in the second layer ranges from 55 degrees to 90 degrees, and each of the second angles is an acute angle between the basal plane of a corresponding one of the second flake graphite fillers and a second laminated surface of the laminate.

First claim

What is claimed is:

1. A heat conductor comprising:
a first layer containing a first resin component and first flake graphite fillers each having a basal plane; and
a second layer containing a second resin component and second flake graphite fillers each having a basal plane,
wherein the heat conductor is a laminate including the first layer and the second layer,
wherein an average of first angles in the first layer is 35 degrees or smaller, each of the first angles being an acute angle between the basal plane of a corresponding one of the first flake graphite fillers and a first laminated surface of the laminate,
wherein an average of second angles in the second layer ranges from 55 degrees to 90 degrees, each of the second angles being an acute angle between the basal plane of a corresponding one of the second flake graphite fillers and the second laminated surface of the laminate,
wherein each of the first flake graphite fillers satisfies a ratio of a/c higher than or equal to 30 and “a” ranges from 1 μm to 300 μm on average, where “a” denotes a maximum length of the first flake graphite filler on the basal plane of the first flake graphite filler, and “c” denotes a maximum thickness of the first flake graphite filler, the maximum thickness of the first flake graphite filler being vertical to the basal plane of the first flake graphite filler, and
wherein each of the second flake graphite fillers satisfies a ratio of a/c higher than or equal to 30 and “a” ranges from 1 μm to 300 μm on average, where “a” denotes a maximum length of the second flake graphite filler on the basal plane of the second flake graphite filler, and “c” denotes a maximum thickness of the second flake graphite filler, the maximum thickness of the second flake graphite filler being vertical to the basal plane of the second flake graphite filler.

2. The heat conductor according to claim 1 ,
wherein upper and lower surfaces of the first layer are parallel to the first laminated surface of the laminate and upper and lower surfaces of the second layer are parallel to the second laminated surface of the laminate.

3. The heat conductor according to claim 1 ,
wherein the first layer and the second layer are separated at an interface.

4. The heat conductor according to claim 1 ,
wherein the average of the first angles is 30 degrees or smaller.

5. The heat conductor according to claim 1 ,
wherein the average of the second angles is 80 degrees or smaller.

6. The heat conductor according to claim 1 ,
wherein the first flake graphite fillers and the second flake graphite fillers account for more than 50% to 80% of the heat conductor by mass.

7. A heat conductor comprising:
a first layer containing a first resin component and first flake graphite fillers each having a basal plane; and
a second layer containing a second resin component and second flake graphite fillers each having a basal plane,
wherein the heat conductor is a laminate including the first layer and the second layer,
wherein an average of first angles in the first layer is 35 degrees or smaller, each of the first angles being an acute angle between the basal plane of a corresponding one of the first flake graphite fillers and a first laminated surface of the laminate,
wherein an average of second angles in the second layer ranges from 55 degrees to 90 degrees, each of the second angles being an acute angle between the basal plane of a corresponding one of the second flake graphite fillers and a second laminated surface of the laminate,
wherein each of the first flake graphite fillers satisfies a ratio of a/b ranging from 1 to 20 on average, where “a” denotes a maximum length of the first flake graphite filler on the basal plane of the first flake graphite filler, and “b” denotes a maximum length of the first flake graphite filler perpendicular to “a” on the basal plane of the first flake graphite filler, and
wherein each of the second flake graphite fillers satisfies a ratio of a/b ranging from 1 to 20 on average, where “a” denotes a maximum length of the second flake graphite filler on the basal plane of the second flake graphite filler, and “b” denotes a maximum length of the second flake graphite filler perpendicular to “a” on the basal plane of the second flake graphite filler.

8. The heat conductor according to claim 1 ,
wherein each of the first flake graphite fillers and the second flake graphite fillers is a heat-treated polymer film.

9. The heat conductor according to claim 8 ,
wherein the heat-treated polymer film is a polyimide film.

10. A device comprising:
a lid;
a main unit; and
the heat conductor according to claim 1 , wherein the heat conductor is between the lid and the main unit.

11. The heat conductor according to claim 7 ,
wherein upper and lower surfaces of the first layer are parallel to the first laminated surface of the laminate and upper and lower surfaces of the second layer are parallel to the second laminated surface of the laminate.

12. The heat conductor according to claim 7 ,
wherein the first layer and the second layer are separated at an interface.

13. The heat conductor according to claim 7 ,
wherein the average of the first angles is 30 degrees or smaller.

14. The heat conductor according to claim 7 ,
wherein the average of the second angles is 80 degrees or smaller.

15. The heat conductor according to claim 7 ,
wherein the first flake graphite fillers and the second flake graphite fillers account for more than 50% to 80% of the heat conductor by mass.

16. The heat conductor according to claim 7 ,
wherein each of the first flake graphite fillers and the second flake graphite fillers is a heat-treated polymer film.

17. The heat conductor according to claim 16 ,
wherein the heat-treated polymer film is a polyimide film.

18. A device comprising:
a lid;
a main unit; and
the heat conductor according to claim 7 , wherein the heat conductor is between the lid and the main unit.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Tanaka Atsushi
• Nishiki Naomi
• Nishikawa Kazuhiro
• Sakaguchi Shigeki
• Kitaura Hidetoshi
• Nakaya Kimiaki

Classifications

• F28F21/02 Primary

  of carbon, e.g. graphite · CPC title

• H05K9/0083

  comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers (H05K9/0086 takes precedence) · CPC title

• B32B2250/24

  All layers being polymeric · CPC title

• Y10T428/24058

  including grain, strips, or filamentary elements in respective layers or components in angular relation · CPC title

• B32B2250/02

  2 layers · CPC title