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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.:

US 12473479 B1

PDFFull Text
Date of Patent:
Nov. 18, 2025

Filed:

Nov. 07, 2018

Hexagonal boron nitride powder and method for producing the same, and composition and heat dissipation material using the same

Applicant:

Showa Denko K.k., Tokyo, JP;

Inventors:

Masaru Fukasawa, Shiojiri, JP;

Yuki Otsuka, Kawasaki, JP;

Assignee:

Resonac Corporation, Tokyo, JP;

Attorney:

Sughrue Mion, PLLC

Primary Examiner:

Guinever S Gregorio

Int. Cl.
CPC ...
C09K 5/14 (2006.01); C01B 21/064 (2006.01); C08J 5/18 (2006.01); C08K 3/04 (2006.01); C08K 3/38 (2006.01); C09C 1/00 (2006.01);
U.S. Cl.
CPC ...
C09K 5/14 (2013.01); C01B 21/0648 (2013.01); C08J 5/18 (2013.01); C08K 3/04 (2013.01); C08K 3/38 (2013.01); C09C 1/0081 (2013.01); C01P 2002/60 (2013.01); C01P 2002/76 (2013.01); C01P 2004/50 (2013.01); C01P 2004/53 (2013.01); C01P 2004/54 (2013.01); C01P 2004/61 (2013.01); C01P 2006/11 (2013.01); C01P 2006/12 (2013.01); C01P 2006/40 (2013.01); C08J 2363/02 (2013.01); C08K 2003/385 (2013.01); C08K 2201/001 (2013.01); C08K 2201/005 (2013.01); C08K 2201/006 (2013.01); C08K 2201/014 (2013.01); C08K 2201/017 (2013.01);
Abstract

A hexagonal BN powder containing an aggregate of primary particles of hexagonal BN nitride and having an average primary particle diameter, a 50% volume cumulative particle diameter D, a BET specific surface area, and a bulk density within predetermined ranges. Further, for a peak A in the particle diameter range of 1.0 μm or more and less than 20.0 μm and a peak B in the particle diameter range of 20.0 μm or more and less than 200.0 μm in a particle size distribution curve, the ratios of the height of the peaks are within predetermined ranges when the hexagonal BN powder is treated under predetermined conditions. Also disclosed is a method for producing the hexagonal BN powder, a composition including the hexagonal BN powder and at least one of a resin and a rubber, and a heat dissipation material containing the composition.

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