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公开(公告)号:US20230056027A1
公开(公告)日:2023-02-23
申请号:US17950784
申请日:2022-09-22
Applicant: FUJIMI INCORPORATED
Inventor: Yusuke KAWASAKI , Shogo TSUBOTA , Masaaki ITO , Jun SHINODA , Keiji ASHITAKA
IPC: C01B33/145 , C01B33/141
Abstract: The present invention provides a means capable of suppressing the formation of fine particles in a method for producing a silica sol. The present invention relates to a method for producing a silica sol, including synthesizing a silica sol by, in a reaction liquid containing an alkoxysilane or a condensate thereof, water, and an alkali catalyst, allowing the alkoxysilane or condensate thereof to react with the water in the presence of the alkali catalyst, wherein the alkali catalyst is not additionally supplied after the start of the synthesis until the finish time of the synthesis, and during 90% or more of the time between when 5 minutes have elapsed from the time point when the electrical conductivity of the reaction liquid reaches a local maximum for the first time and the finish time of the synthesis, the proportion of the value of the electrical conductivity of the reaction liquid is more than 90% relative to the value of the electrical conductivity at the time when 5 minutes have elapsed from the time point when the local maximum is reached.
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公开(公告)号:US20210380813A1
公开(公告)日:2021-12-09
申请号:US17280648
申请日:2019-06-13
Applicant: FUJIMI INCORPORATED , KYOTO UNIVERSITY
Inventor: Souma TAGUCHI , Keigo KAMOSHIDA , Akihiro KATO , Keiji ASHITAKA , Naoya MIWA , Tatsuya HINOKI , Kazuya SHIMODA
IPC: C09C1/28 , C09C3/06 , C04B35/628 , C04B35/565 , C08K9/02 , C08K3/34 , C08J5/24
Abstract: The present invention provides a means that can improve density and mechanical strength in a sintered body of a composition containing a sintering aid and a silicon carbide particle, and a molded article containing the sintered body. The present invention relates to a coated silicon carbide particle powder containing a silicon carbide particle, and a coating layer coating the silicon carbide particle, in which the coating layer contains an aluminum element, and the mass of the aluminum element per unit surface area of the silicon carbide particle is 0.5 mg/m2 or more.
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公开(公告)号:US20190144728A1
公开(公告)日:2019-05-16
申请号:US16245030
申请日:2019-01-10
Applicant: FUJIMI INCORPORATED
Inventor: Keiji ASHITAKA , Shogo TSUBOTA
IPC: C09K3/14 , B24B37/04 , C09G1/02 , H01L21/3105
CPC classification number: C09K3/1463 , B24B37/044 , C09G1/02 , C09K3/1436 , H01L21/31053
Abstract: Disclosed herein is a polishing composition comprising a pH of 6 or less, sulfonic acid-modified colloidal silica obtained by immobilizing sulfonic acid on surfaces of silica particles, and water, wherein the sulfonic acid-modified colloidal silica is derived from sulfonic acid-modified aqueous anionic silica sol produced by a production method comprising: a first reaction step of obtaining a reactant by heating raw colloidal silica having a number distribution ratio of 10% or less of microparticles having a particle diameter of 40% or less relative to a volume average particle diameter based on Heywood diameter (equivalent circle diameter) as determined by image analysis using a scanning electron microscope in the presence of a silane coupling agent having a functional group chemically convertible to a sulfonic acid group; and a second reaction step of converting the functional group to a sulfonic acid group by treating the reactant.
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公开(公告)号:US20170342304A1
公开(公告)日:2017-11-30
申请号:US15544425
申请日:2016-01-19
Applicant: FUJIMI INCORPORATED
Inventor: Keiji ASHITAKA , Shogo TSUBOTA
IPC: C09K3/14 , B24B37/04 , C09G1/02 , H01L21/3105
Abstract: To provide a technique with which in a case where sulfonic acid-modified aqueous anionic sol is used as abrasive grain, in a polishing composition for polishing an object to be polished that contains SiN, the stability of the SiN polishing rate with time can be improved, and the content of hydrogen peroxide can be decreased.In a polishing composition having a pH of 6 or less, sulfonic acid-modified colloidal silica obtained by immobilizing sulfonic acid on surfaces of silica particles, and water are allowed to be contained, at this time, as the sulfonic acid-modified colloidal silica, the one derived from sulfonic acid-modified aqueous anionic silica sol produced by a production method including a first reaction step of obtaining a reactant by heating raw colloidal silica having a number distribution ratio of 10% or less of microparticles having a particle diameter of 40% or less relative to a volume average particle diameter based on Heywood diameter (equivalent circle diameter) as determined by image analysis using a scanning electron microscope in the presence of a silane coupling agent having a functional group chemically convertible to a sulfonic acid group; and a second reaction step of converting the functional group to a sulfonic acid group by treating the reactant is used.
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公开(公告)号:US20240182305A1
公开(公告)日:2024-06-06
申请号:US18285052
申请日:2022-03-22
Applicant: FUJIMI INCORPORATED
Inventor: Hiroki KOBAYAKAWA , Ryo NOMURA , Yasuhide UEMURA , Naoya MIWA , Keiji ASHITAKA
IPC: C01B25/42
CPC classification number: C01B25/42 , C01P2002/20 , C01P2002/72 , C01P2004/03 , C01P2004/51 , C01P2004/61 , C01P2004/62 , C01P2006/12
Abstract: The present invention enables to provide plate-like titanium pyrophosphate, having both high uniformity in size and specific particle shape, which is expected to be highly useful. The present invention relates to plate-like titanium pyrophosphate having an aspect ratio of 5 or more expressed as a ratio of the in-plane length DPL50 of primary particles, at which the cumulative frequency from the smaller particle size side is 50% in a volume-based cumulative particle size distribution, to the thickness DPT50 of primary particles, at which the cumulative frequency from the smaller particle size side is 50% in a volume-based cumulative particle size distribution (the in-plane length DPL50 of primary particles/the thickness DPT50 of primary particles), wherein the relationship among the particle size D10 of secondary particles, at which the cumulative frequency from the smaller particle size side is 10% in a volume-based cumulative particle size distribution, the particle size D50 of secondary particles, at which the cumulative frequency from the smaller particle size side is 50% in a volume-based cumulative particle size distribution, and the particle size D90 of secondary particles, at which the cumulative frequency from the smaller particle size side is 90% in a volume-based cumulative particle size distribution, satisfies a specific relationship; and a method for producing the same.
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公开(公告)号:US20210145712A1
公开(公告)日:2021-05-20
申请号:US17043166
申请日:2019-03-28
Applicant: FUJIMI INCORPORATED
Inventor: Mayumi IWAKUNI , Keiji ASHITAKA , Naoya MIWA
Abstract: Provided is a white pigment for cosmetics, and the white pigment has a higher function as a base pigment than that of titanium oxide. A white pigment for cosmetics of the present invention includes a titanium phosphate powder having a whiteness of 92.91 or more as determined in accordance with JIS Z 8715.
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公开(公告)号:US20200308009A1
公开(公告)日:2020-10-01
申请号:US16818114
申请日:2020-03-13
Applicant: FUJIMI INCORPORATED
Inventor: Yusuke KAWASAKI , Shogo TSUBOTA , Masaaki ITO , Jun SHINODA , Keiji ASHITAKA
IPC: C01B33/145
Abstract: The present invention provides a means capable of suppressing the formation of fine particles in a method for producing a silica sol. The present invention relates to a method for producing a silica sol, including synthesizing a silica sol by, in a reaction liquid containing an alkoxysilane or a condensate thereof, water, and an alkali catalyst, allowing the alkoxysilane or condensate thereof to react with the water in the presence of the alkali catalyst, wherein the alkali catalyst is not additionally supplied after the start of the synthesis until the finish time of the synthesis, and during 90% or more of the time between when 5 minutes have elapsed from the time point when the electrical conductivity of the reaction liquid reaches a local maximum for the first time and the finish time of the synthesis, the proportion of the value of the electrical conductivity of the reaction liquid is more than 90% relative to the value of the electrical conductivity at the time when 5 minutes have elapsed from the time point when the local maximum is reached.
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公开(公告)号:US20190233678A1
公开(公告)日:2019-08-01
申请号:US16338002
申请日:2017-09-05
Applicant: FUJIMI INCORPORATED
Inventor: Souma TAGUCHI , Keiji ASHITAKA , Naoya MIWA
IPC: C09G1/02 , C01B33/146 , C09K3/14
CPC classification number: C09G1/02 , B24B37/00 , B24B37/044 , C01B33/146 , C09K3/1436 , H01L21/304 , H01L21/30625 , H01L21/31055 , H01L21/3212
Abstract: To provide a means capable of suppressing the generation of gelation at the time of or after the addition of a silane coupling agent in the production of a cationically modified silica including modifying a silica raw material with a silane coupling agent. The present invention is a method for producing a cationically modified silica, including: mixing a silica raw material having a negative zeta potential with a silane coupling agent having an amino group or a quaternary cationic group; and reacting the silica raw material with the silane coupling agent to obtain a cationically modified silica, in which the cationically modified silica satisfies the following relational expression (1): X
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公开(公告)号:US20240262698A1
公开(公告)日:2024-08-08
申请号:US18429695
申请日:2024-02-01
Applicant: FUJIMI INCORPORATED
Inventor: Shogo TSUBOTA , Masaaki ITO , Keiji ASHITAKA , Yusuke KAWASAKI , Kazuaki IWASAKI
IPC: C01B33/141
CPC classification number: C01B33/141 , C01P2004/64 , C01P2006/22 , C01P2006/80
Abstract: A silica sol which does not gelate, has a high purity, and contains a high concentration of silica particles is provided. A silica sol containing silica particles and water, wherein a product of an average primary particle size of the silica particles and an average circularity of the silica particles is 15.0 or more and 31.2 or less, a concentration of the silica particles is 20 mass % or more, a total organic carbon amount per silica particle is less than 10 mass ppm, when the concentration of the silica particles is 20 mass %, a viscosity at 25° C. is 300 mPa·s or less, and a concentration of a metal impurity is less than 1 mass ppm.
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公开(公告)号:US20230313011A1
公开(公告)日:2023-10-05
申请号:US18122961
申请日:2023-03-17
Applicant: FUJIMI INCORPORATED
Inventor: Shogo TSUBOTA , Keiji ASHITAKA , Masaaki ITO , Tatsuhiko HIRANO , Shota SUZUKI
CPC classification number: C09K3/1436 , C09G1/02
Abstract: The present invention provides a means capable of further improving stability and washability under acidic conditions. The present invention is sulfonic acid-modified colloidal silica having an amount of sulfonic acid groups per 1 g of particles of 1.5 μmol/g or more and 13.0 μmol/g or less.
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