Method for producing graphite film
AssigneeKaneka Corporation
InventorsMotoaki KOBAYASHI, Masahiro KOJIMA, Yasushi NISHIKAWA
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Abstract
A method of producing a graphite film has an excellent appearance and excellent thermal diffusivity. A graphite film production method includes the steps of: preparing a polyimide film having a heating loss rate X of 0.13% to 10%, which heating loss rate X is represented by: heating loss rate X=(b−a)/a . . . Formula (1); and graphitizing the polyimide film by subjecting the polyimide film to a heat treatment. Where (i) a represents a mass of the polyimide film after the polyimide film is heated at 400° C. for 15 minutes and (ii) b represents a mass of the polyimide film after the polyimide film is heated at 150° C. for 15 minutes.
Claims10
A method of producing a graphite film, comprising the steps of:
- preparing a polyimide film having a heating loss rate X of 0.13% to 10%, which heating loss rate X is represented by Formula (1) below;
- and
- graphitizing the polyimide film by subjecting the polyimide film to a heat treatment,
- Heating loss rate X=(b−a)/a Formula (1)
- where (i) a represents a mass of the polyimide film after the polyimide film is heated at 400° C. for 15 minutes and (ii) b represents a mass of the polyimide film after the polyimide film is heated at 150° C. for 15 minutes.
A method of producing a graphite film, comprising the steps of:
- preparing a polyimide film having a thermal shrinkage rate of not less than 0.30% after being heated at 400° C. for 15 minutes;
- and
- graphitizing the polyimide film by subjecting the polyimide film to a heat treatment.
Dependencies are inferred from the claim text.