The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 10, 2018
Filed:
Feb. 09, 2015
Denka Company Limited, Tokyo, JP;
National Institute for Materials Science, Tsukuba-shi, Ibaraki, JP;
Fumihiro Kurokawa, Omuta, JP;
Seitaro Kobayashi, Omuta, JP;
Takashi Kawasaki, Machida, JP;
Go Takeda, Machida, JP;
Yoshio Bando, Tsukuba, JP;
Dmitri Golberg, Tsukuba, JP;
DENKA COMPANY LIMITED, Tokyo, JP;
NATIONAL INSTITUTE FOR MATERIALS SCIENCE, Tsukuba-shi, Ibaraki, JP;
Abstract
A boron nitride fine particle has low major diameter/thickness (aspect) ratio, high purity and high crystallinity, and also has an average particle diameter of 0.05 to 2.0 μm, a graphitization index of 3 or less, and a total oxygen content of 0.20% by mass or less, with an average value of a major diameter/thickness ratio of scaly particles being 6.0 or less. A method of producing a boron nitride fine particle includes introducing ammonia and an alkoxide borate at an ammonia/alkoxide borate molar ratio of 1 to 5 in a reaction vessel in an inert gas atmosphere for heating at 800 to 1,350° C. within 30 seconds thereby obtaining a boron nitride precursor, and then heating the boron nitride precursor at 1,650 to 2,200° C. for at least 0.5 hour in an inert gas atmosphere.