Cake of easily dispersible precipitated silica

Details Cake of easily dispersible precipitated silica Cake of easily dispersible precipitated silica

2011-07-26

2011-07-26

Le, Emily (Department: 1734)

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

C428S032370, C516S082000, C524S493000

Reexamination Certificate

active

07985392

ABSTRACT:
An easily dispersible cake of precipitated silica, wherein the precipitated silica has a BET specific surface area of at least 220 m2/g. When the cake is dispersed in ion-exchange water to provide an aqueous dispersion of the silica of 5% by weight in concentration and further diluted to reduce the silica concentration to 1.5% by weight, the dispersion has a light-scattering index (n-value) of at least 2. The easily dispersible cake can be obtained by simultaneously adding an alkali silicate and a mineral acid to a reaction liquid whose pH is being maintained at a fixed value within a range of 7.5-11.5 and whose temperature is being maintained at 92-98° C., thus forming precipitated silica through their reaction, and separating the precipitated silica from the reaction liquid in wet state.

REFERENCES:
patent: 2601235 (1952-06-01), Alexander et al.
patent: 5342598 (1994-08-01), Persello
patent: 5637636 (1997-06-01), Cartwright et al.
patent: 5964937 (1999-10-01), Stanier
patent: 5968470 (1999-10-01), Persello
patent: 6143066 (2000-11-01), Bomal et al.
patent: 6169135 (2001-01-01), Chevallier et al.
patent: 6221149 (2001-04-01), Bomal et al.
patent: 6268424 (2001-07-01), Blume et al.
patent: 6335396 (2002-01-01), Chevallier et al.
patent: 6417264 (2002-07-01), Kono et al.
patent: 6468493 (2002-10-01), Chevallier et al.
patent: 6616916 (2003-09-01), Karpe et al.
patent: 6656241 (2003-12-01), Hellring et al.
patent: 6866711 (2005-03-01), Sinclair et al.
patent: 6946119 (2005-09-01), Gallis et al.
patent: 2003/0039808 (2003-02-01), Ichinose et al.
patent: 2004/0143050 (2004-07-01), Gatti et al.
patent: 0 535 943 (1993-04-01), None
patent: 535943 (1993-04-01), None
patent: 1013605 (2000-06-01), None
patent: 61-141584 (1986-06-01), None
patent: 3-45511 (1991-02-01), None
patent: 03-045511 (1991-02-01), None
patent: 5-208808 (1993-08-01), None
patent: 05-208808 (1993-08-01), None
patent: 7-223810 (1995-08-01), None
patent: 07-223810 (1995-08-01), None
patent: 9-142827 (1997-06-01), None
patent: WO 98/54090 (1998-12-01), None
Japanese Office Action issued Jan. 5, 2009 in Japanese Application No. 2003-192184 (Partial Translation).
Partial English translation of JP 7-223810, previously cited with its abstract in the Information Disclosure Statement of Apr. 5, 2005.

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