公开(公告)号：US11097948B2

公开(公告)日：2021-08-24

申请号：US16073608

申请日：2017-01-25

Applicant: TOKUYAMA CORPORATION

Inventor： Akimasa Kuramoto ,  Kikuo Yamamoto ,  Mou Ou ,  Saiko Fujii ,  Yukihiro Kanechika ,  Teruhiko Nawata

IPC: C01B21/072 ,  C08K3/28 ,  C08L101/00 ,  C09C1/40

Abstract: To provide an aluminum nitride particle having a hexagonal columnar barrel part and bowl-like projection parts at both ends of the columnar part, wherein the long diameter (D) of the barrel part is 10 to 250 μm, the ratio (L1/D) of the distance (L1) between the apexes of the two projection pars to the long diameter (D) of the barrel part is 0.7 to 1.3, and the percentage of the length or thickness (L2) of the barrel part to the distance (L1) between the apexes of the two projection parts is 10 to 60%. The aluminum nitride particle can provide high heat conductivity and excellent electric insulation to a resin when it is filled into the resin.

公开(公告)号：US20240308861A1

公开(公告)日：2024-09-19

申请号：US18278667

申请日：2022-03-01

Applicant: Tokuyama Corporation

Inventor： Shota Daiki ,  Kyouichi Fujinami ,  Teruhiko Nawata ,  Satoru Yoshida

IPC: C01B35/14 ,  C08K3/38

CPC classification number: C01B35/146 ,  C08K3/38 ,  C01P2002/10 ,  C01P2004/03 ,  C01P2004/51 ,  C01P2004/54 ,  C01P2004/60 ,  C01P2006/12 ,  C01P2006/19 ,  C08K2003/385 ,  C08K2201/003 ,  C08K2201/006 ,  C08K2201/016

Abstract: Provided are hexagonal boron nitride aggregated particles and hexagonal boron nitride powder, each of which can be filled into a resin to produce a resin composition with an extremely high dielectric strength and thermal conductivity, and to reduce the density of the resin composition. Provided are hexagonal boron nitride aggregated particles, in which aggregated particles of hexagonal boron nitride primary particles have a longer diameter ranging from 5 to 10 μm, a longer diameter/shorter diameter ranging from 1.0 to 1.3, and a circularity within a range from 0.3 to 0.8, and a maximum diameter of primary particles which can be confirmed on the surface of the aggregated particles on an SEM observation image at 10,000 magnification is 4 μm or less. Provided is a hexagonal boron nitride powder including aggregated particles of hexagonal boron nitride primary particles, in which a particle size (D50) at a cumulative volume frequency of 50% in a particle size distribution as measured by a wet laser diffraction particle size distribution analysis is from 5 to 150 μm, a volume-based median diameter of pores as measured by a mercury porosimetry is 3.0 μm or less, and a content of impurity elements is 500 ppm or less.

公开(公告)号：US12145844B2

公开(公告)日：2024-11-19

申请号：US17312567

申请日：2020-02-28

Applicant: TOKUYAMA CORPORATION ,  SHINSHU UNIVERSITY

Inventor： Yuichi Ikeda ,  Shota Daiki ,  Kyoichi Fujinami ,  Teruhiko Nawata ,  Katsuya Teshima ,  Tetsuya Yamada

IPC: C01B21/064 ,  C08K3/38 ,  C08L101/00

Abstract: It is an object to achieve a resin sheet having high thermal conductance and high dielectric strength. Hexagonal boron nitride powder in accordance with an aspect of the present invention includes hexagonal boron nitride agglomerate particles each including agglomerated hexagonal boron nitride primary particles, and has a specific surface area of not less than 0.5 m2/g and not more than 5.0 m2/g. The hexagonal boron nitride primary particles each have a long diameter of not less than 0.6 μm and not more than 4.0 μm and an aspect ratio of not less than 1.5 and not more than 5.0.