Patent ID: 9475702
Filing Date: 2016-10-25
CPC Classification: C01B,H01L

Claim Text:
1. A manufacturing method of a graphite sheet, the method comprising: producing a molded sheet by impregnating a cavity-forming sheet having a mesh structure or a nonwoven structure with polyamide acid, and molding the cavity-forming sheet impregnated with polyamide acid into a sheet; producing a polyimide sheet composed of polyimide and the cavity-forming sheet disposed in the polyimide by heat-treating the molded sheet to imidize the polyamide acid, and producing the graphite sheet by firing the polyimide sheet in a non-oxidizing atmosphere to pyrolyze the polyimide, wherein the cavity-forming sheet is composed of material which keeps a shape when the polyimide sheet is produced and which is gasified and loses at least 80% of weight when the polyimide is pyrolyzed.