公开(公告)号：US20230134132A1

公开(公告)日：2023-05-04

申请号：US17915258

申请日：2021-03-24

Applicant: DENKA COMPANY LIMITED

Inventor： Takafumi KOMAKI ,  Junya NITTA ,  Yoshiaki OKAMOTO ,  Masakazu HIRATA ,  Genta KARINO

IPC: C01F7/02 ,  C09K5/14 ,  C08K3/22 ,  C08L101/12

Abstract: An alumina powder containing: a first alumina particle having average particle diameter from 0.1 μm to 1 μm; a second alumina particle having average particle diameter from 1 μm to 10 μm; and a third alumina particle having average particle diameter from 10 μm to 100 μm, wherein the particle diameters are measured using laser light diffraction scattering particle size distribution analyzer, average sphericity of first alumina particle having projected area equivalent circle diameter from 0.1 μm to 1 μm as determined by microscopy is from 0.80 to 0.98, and a ratio of D90/D10 of first alumina particle is from 2.0 to 8.0 wherein the ratio of D90/D10 is a ratio when particle diameter at cumulative value of 10% from fine particle side of cumulative particle size distribution on volume basis is D10 and particle diameter at cumulative value of 90% from fine particle side is D90.

公开(公告)号：US20250136454A1

公开(公告)日：2025-05-01

申请号：US18837178

申请日：2023-02-06

Applicant: Denka Company Limited

Inventor： Takaaki MINAMIKAWA ,  Hiroyuki SHIOTSUKI ,  Genta KARINO

IPC: C01B33/18 ,  C08K3/36 ,  C08K7/18

Abstract: This spherical silica powder is configured such that when the spherical silica powder is measured using a wet flow type image analyzer, a sphericity of a particle size of more than or equal to 5 μm and less than 10 μm is represented by S1, a sphericity of a particle size of more than or equal to 10 μm and less than 20 μm is represented by S2, a sphericity of a particle size of more than or equal to 20 μm and less than 30 μm is represented by S3, a sphericity of a particle size of more than or equal to 30 μm and less than 45 μm is represented by S4, and a sphericity of a particle size of more than or equal to 45 μm is represented by S5, at least two of S1, S2, S3, S4, and S5 are more than or equal to 0.74.

公开(公告)号：US20230150830A1

公开(公告)日：2023-05-18

申请号：US17915368

申请日：2021-03-24

Applicant: DENKA COMPANY LIMITED

Inventor： Takafumi KOMAKI ,  Junya NITTA ,  Yoshiaki OKAMOTO ,  Masakazu HIRATA ,  Genta KARINO

IPC: C01F7/02 ,  C08K3/22

CPC classification number: C01F7/02 ,  C08K3/22 ,  C01P2004/32 ,  C01P2006/12 ,  C01P2006/80 ,  H05K7/2039

Abstract: A carbon-containing alumina powder containing a carbon-containing alumina particle having a projected area equivalent circle diameter of 1 μm or more and 100 μm or less as determined by microscopy, wherein an average sphericity of the carbon-containing alumina particle is 0.85 or more, and a specific surface area is 0.05 m2/g or more and 1.0 m2/g or less, and a ratio B/A of a carbon content ratio B to a carbon content ratio A in the carbon-containing alumina powder calculated by using a specific measurement method is 0.20 or more and 0.90 or less.

公开(公告)号：US20250033982A1

公开(公告)日：2025-01-30

申请号：US18836730

申请日：2023-02-06

Applicant: Denka Company Limited

Inventor： Takaaki MINAMIKAWA ,  Hiroyuki SHIOTSUKI ,  Genta KARINO

IPC: C01B33/18

Abstract: In spherical silica powder according to an embodiment of the present invention, an NO3− content obtained based on an ion chromatography method is less than or equal to 5 ppm.

公开(公告)号：US20230193103A1

公开(公告)日：2023-06-22

申请号：US17913094

申请日：2021-03-24

Applicant: DENKA COMPANY LIMITED

Inventor： Takafumi KOMAKI ,  Junya NITTA ,  Yoshiaki OKAMOTO ,  Masakazu HIRATA ,  Genta KARINO

IPC: C09K5/14 ,  C08K3/08 ,  C08K7/18

CPC classification number: C09K5/14 ,  C08K3/08 ,  C08K7/18 ,  C08K2003/0812 ,  C08K2201/003 ,  C08K2201/006

Abstract: The alumina powder contains: a first alumina particle having an average particle diameter of 0.1 µm or more and less than 1 µm; a second alumina particle having an average particle diameter of 1 µm or more and less than 10 µm; and a third alumina particle having an average particle diameter of 10 µm or more and 100 µm or less, wherein each of the average particle diameters is a particle diameter measured using laser light diffraction scattering particle size distribution analyzer, average sphericity of first alumina particle having projected area equivalent circle diameter of 0.1 µm or more and 1 µm or less as determined by microscopy is 0.80 or more and 0.98 or less, a specific surface area of first alumina particle is 1.9 m2/g or more and 20.0 m2/g or less, and content ratio of an α crystal phase is 80% by mass or more.