公开(公告)号：US20250115484A1

公开(公告)日：2025-04-10

申请号：US18836348

申请日：2023-02-06

Applicant: Denka Company Limited

Inventor： Teruhiro AIKYO ,  Tomohiro KAWABATA ,  Jun YAMAGUCHI ,  Atsushi YAMASHITA

IPC: C01B33/18 ,  C01F7/02

Abstract: Inorganic powder includes spherical alumina powder and spherical silica powder, in which when the inorganic powder is measured using a wet flow type image analyzer, a sphericity of a particle size of 5-10 μm is represented by S1, a sphericity of a particle size of 10-20 μm is represented by S2, a sphericity of a particle size of 20-30 μm is represented by S3, a sphericity of a particle size of 30-45 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, S3, S4, and Ss are more than or equal to 0.89, and S2 is more than or equal to 0.75 and less than 0.89.

公开(公告)号：US20230331572A1

公开(公告)日：2023-10-19

申请号：US18028956

申请日：2021-09-24

Applicant: DENKA COMPANY LIMITED

Inventor： Teruhiro AIKYO ,  Tomohiro KAWABATA ,  Jun YAMAGUCHI ,  Atsushi YAMASHITA

IPC: C01F7/02 ,  C08K7/18 ,  C08L83/04

CPC classification number: C01F7/02 ,  C08K7/18 ,  C08L83/04 ,  C01P2004/32 ,  C01P2004/51 ,  C08K2201/003

Abstract: A spherical alumina powder having a maximum particle diameter showing a maximum peak in the range of 35 to 70 μm, a frequency of 5 to 15%, and an accumulated value of frequencies respectively at 20 particle diameter points, obtained by dividing a particle diameter range of 1 to 20 μm equally into 19 sections, of 3 to 17% by volume, the powder providing a ratio (VY/VX) of a viscosity VY of a resin composition Y to a viscosity VX of a resin composition X of 0.85 or more, composition X containing the powder and a vinyl group-containing polymethylsiloxane, the powder being contained in an amount of 88.1% by mass, the resin composition Y being the same as X except for containing the same powder as in composition X in an amount of 79.3% by mass and containing a powder for testing in an amount of 8.8% by mass.

公开(公告)号：US20250136461A1

公开(公告)日：2025-05-01

申请号：US18837068

申请日：2023-02-06

Applicant: DENKA COMPANY LIMITED

Inventor： Teruhiro AIKYO ,  Tomohiro KAWABATA ,  Jun YAMAGUCHI ,  Atsushi YAMASHITA

IPC: C01F7/025 ,  C01B33/18

Abstract: Inorganic powder according to the present invention includes spherical alumina powder and spherical silica powder, in which an angle of repose measured using a powder tester under conditions of a room temperature of 25° C. and a humidity of 65% is more than or equal to 35° and less than or equal to 47°.