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.

公开(公告)号：US20200180968A1

公开(公告)日：2020-06-11

申请号：US16789137

申请日：2020-02-12

Applicant: FUJIMI INCORPORATED

Inventor： Keiji ASHITAKA ,  Masaaki ITO ,  Jun SHINODA

IPC: C01B33/145 ,  C08L83/04 ,  B01J13/00

Abstract: [Problem] Provided is a method for producing a silica sol capable of providing consistent production of the silica sol having a uniform particle size of silica particles in any particle size of the silica particles.[Solution] A method for producing a silica sol is a method including a step of mixing liquid (A) containing an alkaline catalyst, water, and a first organic solvent with liquid (B) containing an alkoxysilane or its condensate and a second organic solvent, and liquid (C1) having a pH of 5.0 or higher and lower than 8.0 and containing water or liquid (C2) containing water and being free of an alkaline catalyst to make a reaction liquid.

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.

公开(公告)号：US20240199432A1

公开(公告)日：2024-06-20

申请号：US18595187

申请日：2024-03-04

Applicant: FUJIMI INCORPORATED

Inventor： Masaaki ITO ,  Jun SHINODA ,  Keiji ASHITAKA

IPC: C01B33/148 ,  C01B33/14 ,  C01B33/141 ,  C01B33/145

CPC classification number: C01B33/148 ,  C01B33/141 ,  C01B33/145 ,  C01B33/14 ,  C01P2004/64 ,  C01P2006/22

Abstract: A method for manufacturing a silica sol according to an embodiment of the present invention includes: a step of preparing a silica sol reaction liquid by hydrolyzing and polycondensing an alkoxysilane or a condensate thereof using an alkali catalyst in a solvent; and at least one of a step of concentrating the silica sol reaction liquid by an ultrasonic atomization separation method and a step of replacing the silica sol reaction liquid with water by the ultrasonic atomization separation method.

公开(公告)号：US20200308010A1

公开(公告)日：2020-10-01

申请号：US16818148

申请日：2020-03-13

Applicant: FUJIMI INCORPORATED

Inventor： Masaaki ITO ,  Jun SHINODA ,  Keiji ASHITAKA

IPC: C01B33/148 ,  C01B33/145

Abstract: A method for manufacturing a silica sol according to an embodiment of the present invention includes: a step of preparing a silica sol reaction liquid by hydrolyzing and polycondensing an alkoxysilane or a condensate thereof using an alkali catalyst in a solvent; and at least one of a step of concentrating the silica sol reaction liquid by an ultrasonic atomization separation method and a step of replacing the silica sol reaction liquid with water by the ultrasonic atomization separation method.

公开(公告)号：US20210087067A1

公开(公告)日：2021-03-25

申请号：US17022876

申请日：2020-09-16

Applicant: FUJIMI INCORPORATED

Inventor： Keiji ASHITAKA ,  Yusuke KAWASAKI ,  Masaaki ITO ,  Jun SHINODA ,  Shogo TSUBOTA

IPC: C01B33/145

Abstract: There is provided a method for producing a silica sol including: a first step of adding an organic acid to at least one of liquid (A) containing an alkaline catalyst, water, and a first organic solvent and liquid (C) containing water; and a second step of mixing the liquid (A) with liquid (B) containing an alkoxysilane or its condensate and a second organic solvent, and the liquid (C) to make a reaction liquid after the first step.

公开(公告)号：US20190010059A1

公开(公告)日：2019-01-10

申请号：US15748771

申请日：2016-07-25

Applicant: FUJIMI INCORPORATED

Inventor： Keiji ASHITAKA ,  Masaaki ITO ,  Jun SHINODA

IPC: C01B33/145 ,  B01J13/00 ,  C08L83/04

Abstract: [Problem] Provided is a method for producing a silica sol capable of providing consistent production of the silica sol having a uniform particle size of silica particles in any particle size of the silica particles.[Solution] A method for producing a silica sol is a method including a step of mixing liquid (A) containing an alkaline catalyst, water, and a first organic solvent with liquid (B) containing an alkoxysilane or its condensate and a second organic solvent, and liquid (C1) having a pH of 5.0 or higher and lower than 8.0 and containing water or liquid (C2) containing water and being free of an alkaline catalyst to make a reaction liquid.