公开(公告)号：US20210061667A1

公开(公告)日：2021-03-04

申请号：US16644583

申请日：2018-09-05

Applicant: FUSO CHEMICAL CO., LTD.

Inventor： Kazui Omokawa ,  Hirokazu Yokota ,  Kenichi Takeuchi ,  Yuma Negishi ,  Tomoko Kiseki ,  Munenori Komoto

IPC: C01B33/159 ,  C01B33/152 ,  G03G9/097

Abstract: Provided is a hydrophobic silica powder that can be obtained by the sol-gel process, and that is excellent in charge properties. The hydrophobic silica powder has a hydrophobicity of 50% or more, a saturated water content of 4% or less, and a nitrogen content of 0.05% or more.

公开(公告)号：US11691885B2

公开(公告)日：2023-07-04

申请号：US16644583

申请日：2018-09-05

Applicant: FUSO CHEMICAL CO., LTD.

Inventor： Kazui Omokawa ,  Hirokazu Yokota ,  Kenichi Takeuchi ,  Yuma Negishi ,  Tomoko Kiseki ,  Munenori Komoto

IPC: C01B33/159 ,  C01B33/152 ,  G03G9/097

CPC classification number: C01B33/159 ,  C01B33/152 ,  G03G9/09725 ,  C01P2002/86 ,  C01P2006/82

Abstract: Provided is a hydrophobic silica powder that can be obtained by the sol-gel process, and that is excellent in charge properties. The hydrophobic silica powder has a hydrophobicity of 50% or more, a saturated water content of 4% or less, and a nitrogen content of 0.05% or more.

公开(公告)号：US20200348611A1

公开(公告)日：2020-11-05

申请号：US16754459

申请日：2018-09-21

Applicant: FUSO CHEMICAL CO., LTD.

Inventor： Hirokazu Yokota ,  Munenori Komoto ,  Kenichi Takeuchi

IPC: G03G9/097 ,  C09C1/30

Abstract: A hydrophobic silica powder is disclosed that exhibits reduced desorption of a charge control agent, on the charge-controllable surface, and that is capable of imparting charge properties within a suitable range to toner resin particles to which the hydrophobic silica particles are externally added. A hydrophobic silica powder is characterized in that (1) the hydrophobic silica powder has a hydrophobicity of 50% or more; (2) an amount X is 0.1 mass % or more, the amount X being an amount of at least one compound selected from the group consisting of a quaternary ammonium ion, a mono-azo complex, and a mineral acid ion extracted with a mixture solvent of methanol and a ethanesulfonic acid aqueous solution: and (3) the amount X and an amount Y satisfy the following formula (I): Y/X