公开(公告)号：US10550300B2

公开(公告)日：2020-02-04

申请号：US15205571

申请日：2016-07-08

申请人： NISSAN CHEMICAL INDUSTRIES, LTD.

发明人： Kiyomi Ema ,  Noriyuki Takakuma ,  Tohru Nishimura ,  Naoki Kawashita ,  Kouji Yamaguchi

IPC分类号： C09K3/14 ,  C09K13/04 ,  C01B33/143 ,  C01B33/148 ,  C01B33/141

摘要： A method for producing an active silicic acid solution in which the existing amount of foreign matters as plate-like fine particles is reduced and a method for producing a silica sol in which such foreign matters are reduced. The method fulfills the following condition; the existing amount of plate-like fine particles having a length of one side of 0.2 to 4.0 μm and a thickness of 1 to 100 nm is measured to be 0% to 30% in accordance with measuring method A, the method including the steps of: preparing an active silicic acid solution by subjecting an alkali silicate aqueous solution having a silica concentration of 0.5% by mass to 10.0% by mass to cation-exchange to remove alkaline components; and filtering the active silicic acid solution through a filter whose removal rate of particles having a primary particle size of 1.0 μm is 50% or more.

公开(公告)号：US09938155B2

公开(公告)日：2018-04-10

申请号：US14690946

申请日：2015-04-20

申请人： NISSAN CHEMICAL INDUSTRIES, LTD.

发明人： Kiyomi Ema ,  Noriyuki Takakuma ,  Tohru Nishimura ,  Naoki Kawashita ,  Kouji Yamaguchi

IPC分类号： C01B33/148 ,  C01B33/143 ,  B82Y30/00 ,  C09K3/14

CPC分类号： C01B33/1485 ,  B82Y30/00 ,  C01B33/1435 ,  C01P2004/64 ,  C09K3/1463

摘要： To provide a method for producing an alkali silicate aqueous solution containing a reduced amount of foreign substance of plate-like fine particles and a method for producing a silica sol containing a reduced amount of foreign substance of plate-like fine particles. A method for producing an alkali silicate aqueous solution fulfilling the following condition: the existing amount of plate-like fine particles having a length of one side of 0.2 to 4.0 μm and a thickness of 1 to 100 nm is determined to be 0 to 30%. The method for producing an alkali silicate aqueous solution includes the steps of adjusting a silica concentration of an alkali silicate aqueous solution to 0.5 to 10.0% by mass and filtering the alkali silicate aqueous solution through a filter having a removal rate of particles with a primary particle size of 1.0 μm of 50% or more.