Polyimide film for graphite sheet and manufacture method thereof

A technology of polyimide film and graphite sheet, which is applied in the field of polyimide film and its manufacturing, and can solve the problems of insufficient foaming degree, graphite sheet thermal conductivity, flexibility, and insufficient bending resistance of heat dissipation parts, etc. , to achieve the effect of good foaming and excellent thermal conductivity

Inactive Publication Date: 2016-01-20
DUPONT TORAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, only controlling the temperature rise rate during graphitization may not sufficiently expand the film, and the resulting graphi

Method used

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  • Polyimide film for graphite sheet and manufacture method thereof
  • Polyimide film for graphite sheet and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0134] N,N-Dimethicone of calcium hydrogen phosphate in which the particle size of all inorganic particles is between 0.01 μm and 6.0 μm, the average particle size is 0.87 μm, and the particle size is 0.5 to 2.5 μm. The acetamide slurry was added to the polyamic acid solution obtained in the synthesis example in an amount of 0.15% by weight per 1 weight of the solution resin, and was sufficiently stirred and dispersed. In this polyamic acid solution, a conversion agent containing acetic anhydride (molecular weight: 102.09) and β-picoline was mixed and stirred at a ratio of 2.0 molar equivalents to the polyamic acid. The resulting mixture was cast from the tip onto a rotating 65°C stainless steel drum to obtain a self-supporting gel film. This gel film was peeled off from the drum, the both ends were clamped, and it was processed in a heating furnace at 250° C. for 30 seconds, 400° C. for 30 seconds, and 550° C. for 30 seconds to obtain a polyimide film with a thickness of 50 μ...

Embodiment 2、3

[0137] The rotation speed of the drum and the conveyance speed (film formation speed) of the gel film in the heating furnace were adjusted so that the thickness of the obtained polyimide film was 25 μm and 75 μm, that is, the heating time at each heating temperature. Other than that, it carried out similarly to Example 1, and obtained the polyimide film. The obtained polyimide film was fired in the same manner as in Example 1 to obtain a graphite sheet. Calendering was performed in the same manner as in Example 1 to prepare graphite sheets of respective thicknesses.

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Abstract

The invention provides a polyimide film. The film which is graphitized through heat treatment has good foaming. A sheet after graphitization has good thermal conductivity, softness and bend resistance. The polyimide film with a linear expansion coefficient less than 20ppm/DEG C is characterized in the polyimide film is made of raw materials containing p-phenylenediamine, or p-phenylenediamine and 4, 4'-diamino diphenyl ether, and at least one anhydride selected from pyromellitic dianhydride and 3,3',4,4'-biphenyltetracarboxylic anhydride. The graphite sheet is manufactured through thermal treatment of the polyimide film in which inorganic particles at the temperature more than 2000 DEG C.

Description

technical field [0001] The present invention relates to a polyimide film used in the manufacture of a graphite sheet that is used as an electrical conductor or a thermal conductor as a heat dissipation material and a heat equalizing material, and has flexibility and bending resistance, and a method for producing the same. Background technique [0002] Polyimide films are known to have excellent properties in heat resistance, cold resistance, chemical resistance, electrical insulation, and mechanical strength, and are widely used as electrical insulation materials for electric wires, heat insulation materials, flexible printed wiring Base film for substrate (FPC), tape carrier film for tape automated bonding (TAB) of IC, tape for fixing lead frame of IC, etc. [0003] When a polyimide film is used for these applications, an important practical property is the sliding property (slip property) of the film. In various film processing steps, by ensuring the slipperiness of the f...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08K3/32C08G73/10C08J5/18C01B31/04
CPCC08G73/1007C08G73/1071C08J5/18C08J2379/08C08K3/32C08K2003/325C08K2201/003C08L2203/16C08L79/08
Inventor 户井田纪子泽崎孔一
Owner DUPONT TORAY CO LTD
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