Title:
HEXAGONAL BORON NITRIDE POWDER AND METHOD FOR PRODUCING THE SAME
Document Type and Number:
Japanese Patent JP2015212217
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide hexagonal boron nitride powder in which coloring caused by by-products is suppressed, and capable of being imparted with high thermal conductivity and high insulation proof stress when being filled with a resin, and a method for producing the same.SOLUTION: Provided is the mixed powder of hexagonal boron nitride flocculated particles and hexagonal boron nitride simple particles having the average aspect ratio of 3 to 25, the average particle diameter of 4 to 30 μm and a simple particle ratio of 10 to 50%, in which BET specific surface area is 0.5 to 6.0 m/g and oil absorption is 100 g/100 or lower. The hexagonal boron nitride powder is obtained by heating a boron compound, a carbon source and an oxygen-containing calcium compound in specified ratios in a nitrogen atmosphere, are reacted till 1,550°C in such a manner that the carbon concentration in the reactant reaches 5 mass% or lower, and thereafter, heating is performed at 1,700°C or higher to produce hexagonal boron nitride.
Inventors:
DAIKI SHOTA
WAMA RYOTATO
ISHIMOTO RYUJI
WAMA RYOTATO
ISHIMOTO RYUJI
Application Number:
JP2015080562A
Publication Date:
November 26, 2015
Filing Date:
April 10, 2015
Export Citation:
Assignee:
TOKUYAMA CORP
TOYOTA TSUSHO CORP
TOYOTA TSUSHO CORP
International Classes:
C01B21/064; C08K7/00; C08L101/00
Domestic Patent References:
| JP2013543834A | 2013-12-09 | |||
| JP2009280720A | 2009-12-03 | |||
| JPH0416502A | 1992-01-21 | |||
| JPH1129307A | 1999-02-02 | |||
| JPH1160216A | 1999-03-02 | |||
| JP2012111657A | 2012-06-14 | |||
| JPH11171511A | 1999-06-29 |
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