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公开(公告)号：US20170198147A1
公开(公告)日：2017-07-13
申请号：US15325352
申请日：2015-07-24
Applicant: DENKA COMPANY LIMITED
Inventor： Shuji SASAKI , Junya NITTA , Takahisa MIZUMOTO
CPC classification number: C09C1/3081 , B01J2/04 , C01B33/18 , C01P2004/32 , C01P2006/10 , C01P2006/11 , C01P2006/12 , C01P2006/80 , C01P2006/90 , C09C1/30 , G03G9/0819 , G03G9/0827 , G03G9/09716 , G03G9/09725
Abstract: Provided is an external additive for toner, which is suitable for producing a toner having excellent storage stability and chargeability. A silica fine powder suitable for being added to the external additive for toner is also provided. The silica fine powder has a specific surface area of 15 m2/g or more and 90 m2/g or less, a loose bulk density of 0.09 g/cm3 or more and 0.18 g/cm3 or less, a carbon content of 0.25 wt % or more and 0.90 wt % or less, and a hydrophobicity of 60% or more and 75% or less. It is preferable that a ratio (A)/(B) of the loose bulk density of the silica fine powder after surface treatment (A) to a loose bulk density of the silica fine powder before the surface treatment (B) be 1.05 or more and 1.60 or less.
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2.发明公开公开(公告)号：US20240343600A1
公开(公告)日：2024-10-17
申请号：US18683327
申请日：2022-08-09
Applicant: Denka Company Limited
Inventor： Kazuki HIROTA , Takahisa MIZUMOTO , Hiroaki YOSHIGAI
CPC classification number: C01G23/006 , C09C3/003 , C09C3/043 , C01P2004/03 , C01P2004/32 , C01P2004/61 , C01P2006/10 , C01P2006/12 , C01P2006/40
Abstract: A method for producing a barium titanate-based powder, the method including: step a of spraying a raw material including a barium titanate-based compound into a high-temperature field heated to a temperature equal to or higher than a melting point of the compound to form barium titanate-based particles; step b of washing a powder including the barium titanate-based particles formed in step a, or calcining a powder including the barium titanate-based particles formed in step a and then washing the calcined powder; and step c of calcining the washed powder obtained through step b.
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公开(公告)号：US20240174529A1
公开(公告)日：2024-05-30
申请号：US18283246
申请日：2022-02-28
Applicant: DENKA COMPANY LIMITED
Inventor： Kazuki HIROTA , Junya NITTA , Yasutaka OSHIMA , Takahisa MIZUMOTO , Hiroaki YOSHIGAI
IPC: C01G23/00
CPC classification number: C01G23/006 , C01P2004/32 , C01P2004/61 , C01P2006/40
Abstract: A method for producing a barium titanate-based powder, the method including: step a of spraying a raw material including a barium titanate-based compound into a high-temperature field heated to a temperature equal to or higher than a melting point of the compound to form barium titanate-based particles; and step b of heating a powder including the barium titanate-based particles formed in step a at 700 to 1300° C.
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公开(公告)号：US20240166529A1
公开(公告)日：2024-05-23
申请号：US18283243
申请日：2022-02-28
Applicant: DENKA COMPANY LIMITED
Inventor： Kazuki HIROTA , Yasutaka OSHIMA , Yuzo NAKAMURA , Takahisa MIZUMOTO , Hiroaki YOSHIGAI
IPC: C01G23/00
CPC classification number: C01G23/006 , C01P2004/61
Abstract: A method for producing a barium titanate-based powder, the method including: step a of spraying a raw material including a barium titanate-based compound into a high-temperature field heated to a temperature equal to or higher than a melting point of the compound to form barium titanate-based particles; step b of calcining a powder including the barium titanate-based particles formed in step a; and step c of washing a calcination product obtained in step b with a water-based washing liquid.
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