Thermal conductive sheet, method of producing thermal conductive sheet and heat releasing device
View Patent ↗The thermal conductive sheet of the present invention includes a base sheet and, on one surface of the base sheet, a metal foil (C) that has a thickness of from 1 to 30% of a thickness of the base sheet. The base sheet includes a binder component (A) that exhibits elasticity at room temperature and a graphite powder (B) that has anisotropy, and the graphite powder (B) is oriented in a thickness direction.
1. A thermal conductive sheet comprising:
a base sheet that comprises a binder component that exhibits elasticity at room temperature and a graphite powder that has anisotropy, the graphite powder being oriented in a thickness direction; and
a metal foil that has a thickness of from 1 to 30% of a thickness of the base sheet, the metal foil being positioned on one surface of the base sheet.
2. The thermal conductive sheet according to claim 1 , wherein the metal foil is formed from aluminum, copper or tin.
3. The thermal conductive sheet according to claim 1 , comprising, as the binder component, a thermoplastic rubber component that has a glass transition temperature of 50° C. or less.
4. The thermal conductive sheet according to claim 1 , comprising, as the binder component, a thermoplastic rubber component that has a glass transition temperature of 50° C. or less, a thermosetting rubber component, and a thermosetting rubber curing agent that is crosslinkable with the thermosetting rubber component.
5. The thermal conductive sheet according to claim 1 , wherein the graphite powder is a powder obtained by crushing a molded sheet of expanded graphite, and wherein a bulk density of the molded sheet of expanded graphite before crushing is in a range of from 0.1 g/cm 3 to 1.5 g/cm 3 .
6. The thermal conductive sheet according to claim 1 , wherein the graphite powder has a flat and acicular shape or a dendritic shape, and has an average particle size of from 50 μm to 2000 μm.
7. The thermal conductive sheet according to claim 1 , further comprising a phosphoric acid ester.
8. The thermal conductive sheet according to claim 1 , wherein the metal foil is laminated on the base sheet.