Stabilized, aqueous silicon dioxide dispersion

Details Stabilized, aqueous silicon dioxide dispersion Stabilized, aqueous silicon dioxide dispersion

2008-05-20

2008-05-20

Weier, Anthony (Department: 1794)

Food or edible material: processes, compositions, and products

Processes

Treatment of liquid with nongaseous material other than...

C426S423000, C426S330300, C426S330400, C106S483000

Reexamination Certificate

active

07374787

ABSTRACT:
An aqueous dispersion, having a silicon dioxide powder having a silicon dioxide content of 10 to 60 wt.%, wherein the aqueous dispersion is stable in the pH range of 2 to 6, the aqueous dispersion additionally contains at least one compound, which is at least partially soluble in aqueous solution in the pH range 2 to 6 in the form of polyvalent cations, these being stable in a silicate-like environment as an anionic component of the particle surface of the silicon dioxide powder, the quantity of cation-providing compound in relation to the surface of the silicon dioxide is 0.001 to 0.1 mg cation-providing compound/m2silicon dioxide surface, the cation-providing compound being calculated as the oxide, and the zeta potential of the aqueous dispersion has values of less than or equal to zero.

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U.S. Appl. No. 11/571,441, filed Dec. 29, 2006 Lortz et al.

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