Method of producing heat conductive sheet

Patent metadata

Field	Value
Publication number	US-10336929-B2
Application number	US-201314404741-A
Country	US
Kind code	B2
Filing date	Jul 5, 2013
Priority date	Jul 7, 2012
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A method of producing a heat conductive sheet without using a high-cost magnetic field generator. This is achieved by allowing a large amount of a fibrous filler to be contained in a thermosetting resin composition, so that good heat conductivity is obtained without applying a load that may interfere with the normal operation of a heat generating body and a radiator to the heat generating body and the radiator when the heat conductive sheet is disposed therebetween. The method includes: a step (A) of dispersing a fibrous filler in a binder resin to prepare a heat conductive sheet-forming composition; a step (B) of forming a molded block using the prepared heat conductive sheet-forming composition according to an extrusion molding method or a die molding method; a step (C) of slicing the formed molded block into a sheet; and a step (D) of pressing the sliced surface of the obtained sheet.

First claim

The invention claimed is:

1. A method of producing a heat conductive sheet, the method comprising:
dispersing a fibrous filler in a binder resin to prepare a heat conductive sheet-forming composition;
forming a molded block using the prepared heat conductive sheet-forming composition according to an extrusion molding method or a die molding method;
slicing the formed molded block into a sheet;
pressing a sliced surface of the obtained sheet to smooth the sliced surface; and
disposing the smooth sliced surface of the sheet between a heat generating body and a heat dissipator.

2. The production method according to claim 1 , wherein carbon fibers, metal fibers, glass fibers, or ceramic fibers having an average diameter of 8 to 12 μm and an aspect ratio of 2 to 50 are used as the fibrous filler.

3. The production method according to claim 1 , wherein the binder resin is a silicone resin.

4. The production method according to claim 1 , wherein a contained amount of the fibrous filler in the heat conductive sheet-forming composition based on 100 parts by mass of the binder resin is 120 to 300 parts by mass.

5. The production method according to claim 1 , wherein a direction in which the molded block formed by an extrusion molding method is 60 to 120° with respect to a direction of extrusion.

6. The production method according to claim 1 , wherein a pressure applied to the sheet during the pressing is 1 to 8 kgf/cm 2 .

7. The production method according to claim 1 , wherein a spacer is used during the pressing, and the pressing is performed at a set pressure of 0.1 to 30 MPa.

8. The production method according to claim 1 , wherein the pressing is performed while heating at a glass transition temperature of the binder resin or higher.

9. The production method according to claim 1 , wherein the pressing is performed so that a compression ratio of the sheet is 2 to 15%.

10. The production method according to claim 1 , wherein the pressing is performed such that a glossiness of the surface of the sheet after pressing is 0.1 or higher.

11. The production method according to claim 1 , wherein the sliced surface is pressed such that a thermal resistance value of the sheet after pressing becomes lower than the thermal resistance value of the sheet before pressing.

Assignees

• Dexerials Corp

Inventors

• Aramaki Keisuke

Classifications

• H10W70/027

  Mechanical treatments, e.g. deforming, punching or cutting · CPC title

• H10W40/251

  Organics · CPC title

• B29K2995/0013

  Conductive · CPC title

• C08J2383/04

  Polysiloxanes · CPC title

• B29K2509/08

  Glass · CPC title