Process for the production of precipitated silica

Details Process for the production of precipitated silica Process for the production of precipitated silica

1994-08-04

1996-01-16

Griffin, Ronald W.

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

106 35, 51308, 424 49, A61K 716, A61K 718, C09K 314, C01B 3312

Patent

active

054845815

ABSTRACT:
Precipitated silica which has a BET surface area of 10-130 m.sup.2 /g, a CTAB surface area of 10-70 m.sup.2 /g , an average particle diameter of 5-20 .mu.m, a Cu abrasion value in a 10% glycerol dispersion of 4-50 mg and thickening behavior in a CMC solution (20% dispersion) of 300-3500 mPa.multidot.s, is produced by simultaneously adding alkali silicate (weight modulus SiO.sub.2 :alkali oxide=2.5-3.9:1) and a mineral acid to an initial amount of water which has been adjusted to a pH value of 7.0 to 9.9 or 10.0 to 10.7 by the addition of water glass, holding the pH value constant between 7.0 and 9.9 or 10.0 to 10.7 during addition, wherein the initial precipitation temperature is 50.degree.-90.degree. C. and an increase in viscosity occurs after at most 25% of the duration of precipitation, adjusting the pH value to .ltoreq.6, preferably 3.5, once a silica content of greater than 120 g/l or greater than 150 g/l, preferably .gtoreq.160 g/l to 240 g/l, has been reached, separating the solid by filtration, washing, drying and grinding it. The precipitated silica may be used as an abrasive and/or thickening component in toothpastes.

REFERENCES:
patent: 3235331 (1966-02-01), Nauroth et al.
patent: 3928540 (1975-12-01), Morgan
patent: 3977893 (1976-08-01), Wason
patent: 3988162 (1976-10-01), Wason
patent: 4067746 (1978-01-01), Wason et al.
patent: 4076549 (1978-02-01), Wason
patent: 4495167 (1985-01-01), Nauroth et al.
patent: 4857289 (1989-08-01), Nauroth et al.
patent: 4973462 (1990-11-01), Akira et al.
patent: 5066420 (1991-11-01), Chevallier
patent: 5110574 (1992-05-01), Reinhardt et al.
patent: 5286478 (1994-02-01), Persello

Affiliated with

Also associated with

Rating

Process for the production of precipitated silica does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the production of precipitated silica, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of precipitated silica will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-307770