Concentrated suspension of precipitation silica, processes for its preparation and uses of this suspension
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United States of America Patent
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Jul 13, 2004
Grant Date -
N/A
app pub date -
Jan 7, 1997
filing date -
Jul 7, 1994
priority date (Note) -
Expired
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Abstract
The invention relates to an aqueous suspension of precipitated silica, characterized in that its solids content is between 10 and 40% by weight, its viscosity is lower than 4.times.10.sup.-2 Pa.s at a shear rate of 50 s.sup.-1 and the quantity of silica present in the supernatant obtained after centrifuging the said suspension at 7500 revolutions per minute for 30 minutes represents more than 50% of the weight of the silica present in the suspension. The particle size distribution of the agglomerates in suspension is such that their median diameter D.sub.50 is smaller than 5 .mu.m and the deagglomeration factor F.sub.D is greater than 3 ml. This suspension can be employed for the production of anticorrosion coatings and for the preparation of concretes, of paper or of inorganic adhesives.
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