Title:
異方性シリカ凝集体の製造方法
Document Type and Number:
Japanese Patent JP2007527351
Kind Code:
A
Abstract:
Anisotropic aggregates of silica are obtained by: (a) mixing certain polymers with non-aggregated silica particles or sols at pH 7 or above in the absence of added salts; and (b) consolidating the aggregate by heating or by precipitation with a mineral compound. A method for the production of anisotropic aggregates of silica involves: (a) mixing polymer(s) with silica particles which are non-aggregated and/or highly dispersed in aqueous media, at the rate of 0.02-2 mg polymer per m 2>silica particle surface, the value of the electrostatic charge on the silica surface being greater than or equal to that on the surface of silica particles in an aqueous phase in the absence of added salts at pH 7 or above; and (b) consolidating the resulting aggregate by thermal treatment or by precipitation with a mineral compound. Independent claims are included for: (1) products obtained by this method; and (2) silica aggregates comprising a combination of 5-15 primary particles, at least 80% of which are in contact with at most 2 other particles, and in which the greatest measurable distance between two points on the aggregate is not more than 5 times the average primary particle size.
Inventors:
Lionel vanteron
Julian Hernandez
Francoise Rahma
Christoph Chasniu
Christel Peru
Julian Hernandez
Francoise Rahma
Christoph Chasniu
Christel Peru
Application Number:
JP2006518288A
Publication Date:
September 27, 2007
Filing Date:
July 07, 2004
Export Citation:
Assignee:
RHONE-POULENC CHIMIE
SE EN ALE
SE EN ALE
International Classes:
C01B33/18; C01B33/12; C01B33/16; C09C1/28; C09C1/30; C09C3/06; C09C3/10; C09K3/14
Domestic Patent References:
| JPH11504354A | 1999-04-20 | |||
| JPH04201286A | 1992-07-22 |
Foreign References:
| WO2003054089A1 | 2003-07-03 |
Attorney, Agent or Firm:
Motohiro Kurauchi
Endo Azusa
Takumi Yoshida
Taku Nakajima
Endo Azusa
Takumi Yoshida
Taku Nakajima