公开(公告)号：US20240092652A1

公开(公告)日：2024-03-21

申请号：US18272842

申请日：2022-01-14

Applicant: DENKA COMPANY LIMITED

Inventor： Takuji KOBAYASHI ,  Motoharu FUKAZAWA ,  Takuto OKABE ,  Mitsuru KAWAGOE

IPC: C01G23/04 ,  C09C1/36

CPC classification number: C01G23/043 ,  C09C1/36 ,  C01P2002/72 ,  C01P2006/80

Abstract: A method for producing a particle, containing a step of heating a mixture containing TiH2 and TiO2 at 700 to 950° C., wherein a molar ratio of the TiH2 to the TiO2 contained in the mixture is 5.0 to 6.8.

公开(公告)号：US20230295442A1

公开(公告)日：2023-09-21

申请号：US18020182

申请日：2021-08-13

Applicant: DENKA COMPANY LIMITED

Inventor： Takuji KOBAYASHI ,  Motoharu FUKAZAWA ,  Takuto OKABE

IPC: C09C1/36

CPC classification number: C09C1/36 ,  C01P2006/63 ,  C01P2006/64 ,  C01P2006/80 ,  C01P2002/72

Abstract: A method for producing a particle, containing a step of heating a mixture containing TiH2 and TiO2 at 700 to 900° C., wherein a molar ratio of the TiH2 to the TiO2 contained in the mixture is 3.1 to 4.6. A particle having a crystal composition composed of Ti2O3 and γ-Ti3O5, wherein a molar ratio of the Ti2O3 to the γ-Ti3O5 is 0.1 or more.

公开(公告)号：US20240359998A1

公开(公告)日：2024-10-31

申请号：US18573868

申请日：2022-06-20

Applicant: Denka Company Limited

Inventor： Takuji KOBAYASHI ,  Motoharu FUKAZAWA ,  Takuto OKABE

IPC: C01G23/04

CPC classification number: C01G23/043 ,  C01P2002/72 ,  C01P2002/90 ,  C01P2006/22

Abstract: A powder containing: a first particle having a first crystal composition; and a second particle having a second crystal composition different from the first crystal composition, wherein each of the first crystal composition and the second crystal composition contains at least one selected from the group consisting of Ti2O3, γ-Ti3O5 and Ti4O7.

公开(公告)号：US20240351893A1

公开(公告)日：2024-10-24

申请号：US18684435

申请日：2022-08-19

Applicant: Denka Company Limited

Inventor： Takuji KOBAYASHI ,  Motoharu FUKAZAWA ,  Takuto OKABE

IPC: C01B33/18 ,  C08K3/36

CPC classification number: C01B33/18 ,  C08K3/36 ,  C01P2002/70 ,  C01P2002/88 ,  C01P2004/32 ,  C01P2006/32 ,  C01P2006/82

Abstract: To provide: a spherical crystalline silica powder which enables a resin molded article having a high coefficient of linear thermal expansion and a low dielectric tangent to be obtained; and a method for producing the same.
Provided is a spherical crystalline silica powder in which the number of water molecules desorbed at 50° C.-1,000° C. when the temperature is increased from 25° C. to 1,000° C. at a condition of 30° C./min. is 10 μmol/g or less, and in which 10 mass % or more of the total powder is α-quartz crystal.
Also provided is a method for producing a spherical crystalline silica powder, the method comprising:



(i) heating a spherical amorphous silica powder to obtain a spherical crystalline silica powder;
(ii) bringing the spherical crystalline silica powder into contact with an acid; and
(iii) heating, at 800-1,400° C., the spherical crystalline silica powder treated by (ii).