公开(公告)号：US20230159725A1

公开(公告)日：2023-05-25

申请号：US17916209

申请日：2021-03-24

Applicant: DENKA COMPANY LIMITED

Inventor： Junya NITTA ,  Jun YAMAGUCHI ,  Tomohiro KAWABATA ,  Hideaki HIRAI ,  Yasuhisa NISHI

IPC: C08K3/22 ,  C08K7/18 ,  C08K3/36 ,  G06V40/13

CPC classification number: C08K3/22 ,  C08K7/18 ,  C08K3/36 ,  G06V40/13 ,  C08K2003/2227 ,  C08K2201/003

Abstract: An alumina powder containing alumina particles, wherein among the alumina particles, an average sphericity of an alumina particle having a projected area equivalent circle diameter of 50 nm or more as determined by microscopy is 0.80 or more, a content ratio of an alumina particle having a particle diameter of 75 μm or more is 0.05% by mass or less, an average particle diameter of the alumina powder is 0.2 μm or more and 15 μm or less, the average particle diameter is a particle diameter measured using a laser light diffraction scattering particle size distribution analyzer, and an amount of water included in the alumina powder measured by a specific measurement method is 30 ppm or more and 500 ppm or less.