| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermoconductive sheet with a more improved thermal conductivity that can be prepared with a simpler manufacturing method. SOLUTION: This thermoconductive sheet is composed of a polymer composition filled with a boron nitride powder. The boron nitride powder is magnetic- field oriented in a certain direction. The powder preferably comprises a boron nitride having a hexagonal crystal structure as a main component. More preferably, the thermoconductive film has a diffraction peak strength ratio (<002>/<100>) of <1.5 that is a ratio of the diffraction peak strength at plane <002> to that at plane <100> determined by X ray diffraction patterns obtained by X ray irradiation in the thickness direction of the sheet. Accordingly, it is possible to have a boron nitride powder in a polymer composition highly oriented in a certain direction so that a thermoconductive sheet with an excellent thermal conductivity can be obtained. |
