EP 1648823 A2 20060426 - METHOD FOR PREPARING ANISOTROPIC SILICA AGGREGATES
Title (en)
METHOD FOR PREPARING ANISOTROPIC SILICA AGGREGATES
Title (de)
VERFAHREN ZUR HERSTELLUNG VON ANISOTROPEN SILICIUMOXIDAGGREGATEN
Title (fr)
PROCEDE DE PREPARATION D AGREGATS ANISOTROPES DE SILICE
Publication
Application
Priority
- FR 2004001763 W 20040707
- FR 0308467 A 20030710
Abstract (en)
[origin: FR2857351A1] 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.
IPC 1-7
IPC 8 full level
C01B 33/12 (2006.01); C01B 33/16 (2006.01); C09C 1/30 (2006.01)
CPC (source: EP US)
B82Y 30/00 (2013.01 - EP US); C01B 33/12 (2013.01 - EP US); C01B 33/16 (2013.01 - EP US); C09C 1/3036 (2013.01 - EP US); C09C 1/3072 (2013.01 - EP US); C09K 3/1409 (2013.01 - EP US); C01P 2004/32 (2013.01 - EP US); C01P 2004/50 (2013.01 - EP US); C01P 2004/64 (2013.01 - EP US); C01P 2006/12 (2013.01 - EP US)
Citation (search report)
See references of WO 2005007574A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
FR 2857351 A1 20050114; FR 2857351 B1 20050826; EP 1648823 A2 20060426; JP 2007527351 A 20070927; JP 4574614 B2 20101104; US 2007219305 A1 20070920; US 7884153 B2 20110208; WO 2005007574 A2 20050127; WO 2005007574 A3 20050630
DOCDB simple family (application)
FR 0308467 A 20030710; EP 04767598 A 20040707; FR 2004001763 W 20040707; JP 2006518288 A 20040707; US 56379204 A 20040707