公开(公告)号：US11001501B2

公开(公告)日：2021-05-11

申请号：US16789137

申请日：2020-02-12

申请人： FUJIMI INCORPORATED

发明人： Keiji Ashitaka ,  Masaaki Ito ,  Jun Shinoda

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

摘要： [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：US10604411B2

公开(公告)日：2020-03-31

申请号：US15748771

申请日：2016-07-25

申请人： FUJIMI INCORPORATED

发明人： Keiji Ashitaka ,  Masaaki Ito ,  Jun Shinoda

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

摘要： [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：US11518682B2

公开(公告)日：2022-12-06

申请号：US16818114

申请日：2020-03-13

申请人： FUJIMI INCORPORATED

发明人： Yusuke Kawasaki ,  Shogo Tsubota ,  Masaaki Ito ,  Jun Shinoda ,  Keiji Ashitaka

IPC分类号： C01B33/145 ,  C01B33/141 ,  C01B33/14

摘要： 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：US11767224B2

公开(公告)日：2023-09-26

申请号：US17950784

申请日：2022-09-22

申请人： FUJIMI INCORPORATED

发明人： Yusuke Kawasaki ,  Shogo Tsubota ,  Masaaki Ito ,  Jun Shinoda ,  Keiji Ashitaka

IPC分类号： C01B33/145 ,  C01B33/141 ,  C01B33/14

CPC分类号： C01B33/145 ,  C01B33/141 ,  C01B33/1412 ,  C01B33/14 ,  C01P2004/03 ,  C01P2004/62 ,  C01P2004/64

摘要： 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：US20230016801A1

公开(公告)日：2023-01-19

申请号：US17848193

申请日：2022-06-23

申请人： Fujimi Incorporated

发明人： Shogo Tsubota ,  Masaaki Ito ,  Keiji Ashitaka ,  Jun Shinoda ,  Yusuke Kawasaki

IPC分类号： C09G1/02 ,  C09C1/30

摘要： The surface-modified colloidal silica according to an aspect of the present invention contains colloidal silica, and a surface-modifying group for modifying a surface of the colloidal silica, which has a polyoxyalkylene chain having a weight average molecular weight of 20,000 or more.