公开(公告)号：US20220119619A1

公开(公告)日：2022-04-21

申请号：US17434578

申请日：2020-07-30

Applicant: SHOWA DENKO K.K.

Inventor： Hajime YUKUTAKE ,  Yuki OTSUKA ,  Naoki MINORIKAWA ,  Hidetoshi OKAMOTO ,  Toshihiro ARAI

IPC: C08K3/22 ,  C08K3/28 ,  C08L83/04 ,  C08K9/06

Abstract: An inorganic particle dispersion resin composition, containing: a resin; and inorganic particles, in which the inorganic particles include silica-covered aluminum nitride particles and alumina particles, and the silica-covered aluminum nitride particles include aluminum nitride particles and a silica film covering surfaces of the aluminum nitride particles. A total content of the inorganic particles is preferably in a range of greater than or equal to 60.0 volume % and less than or equal to 85.0 volume %.

公开(公告)号：US20210309861A1

公开(公告)日：2021-10-07

申请号：US17270202

申请日：2019-08-23

Applicant: SHOWA DENKO K.K.

Inventor： Yuki OTSUKA ,  Hidetoshi OKAMOTO ,  Naoki MINORIKAWA

IPC: C09C3/12 ,  C09C1/40

Abstract: A method of manufacturing a silicon-containing oxide-coated aluminum nitride particle; a method of manufacturing a heat dispersing resin composition containing the silicon-containing oxide-coated aluminum nitride particle; and the silicon-containing oxide-coated aluminum nitride particle. The method of manufacturing includes: a first step of covering the surface of the aluminum nitride particle with an organic silicone compound including a specific structure; and a second step of heating the aluminum nitride particle covered with the organic silicone compound at a temperature of 300° C. or more and less than 1000° C., wherein the content of carbon atoms in the silicon-containing oxide-coated aluminum nitride particle is less than 1000 ppm by mass.

公开(公告)号：US20220195141A1

公开(公告)日：2022-06-23

申请号：US17601459

申请日：2020-07-09

Applicant: SHOWA DENKO K.K.

Inventor： Naoki MINORIKAWA ,  Ikue KOBAYASHI ,  Yuki OTSUKA

IPC: C08K3/36 ,  C01B21/064 ,  C08K9/10

Abstract: A method of manufacturing a silica-coated boron nitride particle including a first step of covering the surface of the boron nitride particle with an organic silicone compound having a specific structure and a second step of heating the boron nitride particle covered with the organic silicone compound at a temperature of 500° C. or more and 1000° C. or less, wherein the content of carbon atoms in the silica-coated boron nitride particle is 1000 ppm by mass or less. Also disclosed is a method of manufacturing a heat dissipating resin composition containing the silica-coated boron nitride particle; and silica-coated boron nitride particles.

公开(公告)号：US20200339419A1

公开(公告)日：2020-10-29

申请号：US16955493

申请日：2018-12-10

Applicant: SHOWA DENKO K.K.

Inventor： Yuki OTSUKA ,  Hidetoshi OKAMOTO

IPC: C01B21/072 ,  C09C1/00

Abstract: Glass-coated aluminum nitride particles and a method for producing the same. The glass-coated aluminum nitride particles include aluminum nitride particles and a glass phase which covers at least a part of the surface of each aluminum nitride particle. The glass phase is a composition which contains at least a glass component; and the proportion of the composition containing a glass component is 0.2 parts by weight to 5.0 parts by weight with respect to 100 parts by weight of the aluminum nitride particles. The composition containing the glass component further contains boron nitride particle; and the aluminum nitride particles have a volume cumulative d50 of from 10 μm to 200 μm.

公开(公告)号：US20200216738A1

公开(公告)日：2020-07-09

申请号：US16648343

申请日：2018-11-07

Applicant: SHOWA DENKO K.K.

Inventor： Masaru FUKASAWA ,  Yuki OTSUKA

IPC: C09K5/14 ,  C01B21/064 ,  C09C1/00 ,  C08K3/38 ,  C08K3/04 ,  C08J5/18

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 D50, 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.

公开(公告)号：US20200148537A1

公开(公告)日：2020-05-14

申请号：US16473455

申请日：2017-12-26

Applicant: SHOWA DENKO K.K.

Inventor： Yuki OTSUKA ,  Masaru FUKASAWA

IPC: C01B21/064 ,  C08L101/00

Abstract: A hexagonal boron nitride powder having an average longer diameter (L) of primary particles in the hexagonal boron nitride powder of more than 10.0 μm and 30.0 μm or less, an average thickness (D) of the primary particles in the hexagonal boron nitride powder of 1.0 μm or more, a ratio of the average longer diameter (L) to the average thickness (D), [L/D], of 3.0 or more and 5.0 or less, and a content of primary particles having a ratio of a longer diameter (1) to a thickness (d), [l/d], of 3.0 or more and 5.0 or less of 25% or more, a method for producing the hexagonal boron nitride powder, and a resin composition and a resin sheet each containing the hexagonal boron nitride powder.

公开(公告)号：US20180201818A1

公开(公告)日：2018-07-19

申请号：US15744426

申请日：2016-08-19

Applicant: SHOWA DENKO K.K.

Inventor： Yuki OTSUKA ,  Masaru FUKASAWA

IPC: C09K5/14 ,  C01B21/064 ,  C08K3/38 ,  C08K7/00

Abstract: A hexagonal boron nitride (hBN) powder containing an aggregate of primary particles of hBN, in which the powder has a primary particle size of less than 10 μm, a ratio of an average longer diameter (L1) to an average thickness (d1) of the primary particles, [L1/d1], of 5.0 or more and 20 or less, and a BET specific surface area of less than 10 m2/g, and the powder has one maximum peak in a range of a particle size of 45 μm or more and 150 μm or less in a particle size distribution curve of a hexagonal boron nitride powder classified to have a particle size of 45 μm or more and 106 μm or less, and has a decrease rate of the maximum peak of 10% or more and less than 40% when a dispersion liquid obtained by dispersing the hexagonal boron nitride powder in water is subjected to an ultrasonic treatment for 1 minute, the peak decrease rate being calculated by expression (1), a method for producing the hBN powder, and a resin composition and a resin sheet each containing the hBN powder.

公开(公告)号：US20210238465A1

公开(公告)日：2021-08-05

申请号：US16972307

申请日：2019-05-23

Applicant: SHOWA DENKO K.K.

Inventor： Yuki OTSUKA ,  Hidetoshi OKAMOTO

IPC: C09K5/14 ,  C09C1/40 ,  C08K9/02 ,  C08K3/28

Abstract: A method of producing glass-coated aluminum nitride particles which includes a first step of mixing, while applying a shearing force by a mechano-chemical method, a mixture of aluminum nitride particles, and a composition powder containing a glass component, a second step of heat treating the mixture at a temperature of the glass transition temperature of the glass component or more, and 2000° C. or less, and a third step of crushing the heat treated product.

公开(公告)号：US20190337803A1

公开(公告)日：2019-11-07

申请号：US16474284

申请日：2017-12-21

Applicant: SHOWA DENKO K.K.

Inventor： Yuki OTSUKA ,  Masaru FUKASAWA

IPC: C01B21/064 ,  C04B35/583 ,  C01B32/991 ,  C01B32/20

Abstract: An hBN powder containing an aggregate of primary particles of hBN, the hBN powder having a ratio of an average longer diameter (L1) to an average thickness (d1) of the primary particles, [L1/d1], of 10 to 25, a tap density of 0.80 g/cm3 or more, and a BET specific surface area of less than 5.0 m2/g, in which a particle size distribution curve showing a frequency distribution based on volume of the hBN powder is a bimodal distribution curve having a first peak and a second peak in a range of a particle size of 500 μm or less and having a peak height ratio of a second peak height (HB) to a first peak height (HA), [(HB)/(HA)], of 0.90 or less, a method for producing the same, and a resin composition and a resin sheet each comprising the hBN powder.

公开(公告)号：US20180354792A1

公开(公告)日：2018-12-13

申请号：US16060113

申请日：2017-02-14

Applicant: SHOWA DENKO K.K.

Inventor： Yuki OTSUKA ,  Masaru FUKASAWA

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

CPC classification number: C01B21/0645 ,  C01B21/064 ,  C01P2004/03 ,  C01P2004/54 ,  C01P2004/62 ,  C08K3/38 ,  C08K2003/385 ,  C08L101/00

Abstract: A hexagonal boron nitride powder having an average longer diameter (L) of primary particles in the hexagonal boron nitride powder of 10 μm or less, an average thickness (D) of the primary particles in the hexagonal boron nitride powder of 0.20 μm or more, a ratio of the average longer diameter (L) to the average thickness (D), [L/D], of 3.0 or more and 5.0 or less, and a content of primary particles having a ratio of a longer diameter (l) to a thickness (d), [l/d], of 3.0 or more and 5.0 or less of 25% or more. Also disclosed is a method for producing the hexagonal boron nitride powder, and a resin composition and a resin sheet each containing the hexagonal boron nitride powder.