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：US20230332032A1

公开(公告)日：2023-10-19

申请号：US18026889

申请日：2021-09-22

Applicant: DENKA COMPANY LIMITED

Inventor： Takuto OKABE ,  Motoharu FUKAZAWA

IPC: C09K5/14 ,  C01B33/26 ,  C08K3/34 ,  H05K1/03

CPC classification number: C09K5/14 ,  C01B33/26 ,  C08K3/34 ,  H05K1/0373 ,  C01P2006/32 ,  C01P2002/52 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2006/12 ,  C01P2002/72 ,  C08K2201/001 ,  C08K2003/343 ,  C08K2201/005

Abstract: Oxide powder, of which a resin composition is obtained by mixing with a resin exhibits a low thermal expansion coefficient, high thermal conductivity and a low dielectric tangent. The oxide powder containing Ca, Al and Si; wherein the oxide powder contains 40% by mass or more of a crystal phase of high-temperature type cristobalite having Ca, Al and Si, based on the mass of the whole oxide powder; and wherein contents of Ca, Al and Si in the oxide powder are 1 to 5% by mole of CaO, 1 to 5% by mole of Al2O3 and 90 to 98% by mole of SiO2, respectively (the sum of contents of CaO, Al2O3 and SiO2 is 100% by mole) when converting the contents of Ca, Al and Si to contents of CaO, Al2O3 and SiO2.

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).

公开(公告)号：US20240317975A1

公开(公告)日：2024-09-26

申请号：US18578955

申请日：2022-06-24

Applicant: Denka Company Limited

Inventor： Toshihiko TSUNEYOSHI ,  Motoharu FUKAZAWA ,  Takuto OKABE

IPC: C08K9/02 ,  C09C1/30 ,  C09C3/06 ,  H01Q1/36

CPC classification number: C08K9/02 ,  C09C1/3054 ,  C09C3/063 ,  C01P2002/72 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2004/84 ,  H01Q1/36

Abstract: Provided are oxide composite particles to be mixed with a resin to obtain a resin composition having low viscosity, low dielectric constant, and low dielectric loss tangent. The oxide composite particles containing silica and an oxide of aluminum (a single oxide or a composite oxide, or both), in which the oxide composite particles contain 50% by mass or more of an α-cristobalite crystal phase, less than 5% by mass of an α-alumina crystal phase, and 10% by mass or less of a mullite crystal phase, and an elemental ratio of aluminum to silicon (aluminum/silicon) as determined by X-ray photoelectron spectroscopy is 0.01 to 5.0.

公开(公告)号：US20220169832A1

公开(公告)日：2022-06-02

申请号：US17436013

申请日：2020-01-30

Applicant: DENKA COMPANY LIMITED

Inventor： Takuto OKABE ,  Motoharu FUKAZAWA

IPC: C08K7/18 ,  C01B33/18 ,  C08K9/06 ,  B65B1/04

Abstract: A spherical silica powder with a low dielectric tangent, wherein after formulating the spherical silica powder in a resin and molding it into a sheet, in a dielectric tangent of the spherical silica powder calculated by using he following Formula (I) based on a dielectric tangent (tan δc) of the sheet which is measured under the conditions a frequency is 35-40 GHz with a resonator method, B/A is 0.70 or lower, wherein “A” represents a dielectric tangent (tan δfA) of the spherical silica powder before a dielectric tangent reduction treatment and “B” represents a dielectric tangent (tan δfB) of the spherical silica powder after a dielectric tangent reduction treatment; and a specific surface area of said spherical silica powder after a dielectric tangent reduction treatment is 1-30 m2/g.