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：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：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.