Method of preparing high-purity aqueous silica sol

Details Method of preparing high-purity aqueous silica sol Method of preparing high-purity aqueous silica sol

1990-03-20

1992-03-31

Lovering, Richard D.

Compositions

Preservative agents

Anti-corrosion

51308, 10628734, B01J 1300, C01B 3314

Patent

active

051005816

ABSTRACT:
A high-purity stable aqueous silica sol is prepared which has an SiO.sub.2 concentration of from 30 to 50% by weight and which is substantially free from any other polyvalent metal oxides than silica and in which the colloidal silica has a mean particle size falling within the range of from 10 to 30 millimicrons. The silica sol obtained by the method of the present invention has an extremely low content of oxides of polyvalent metals such as iron or aluminum and may therefore be employed for uses which require the absence of such metals in the silica sol, for example, as an abrasive for semiconductors.

REFERENCES:
patent: 2574902 (1951-11-01), Bechtold et al.
patent: 2577484 (1951-12-01), Rule
patent: 2750345 (1956-06-01), Alexander
patent: 3012973 (1961-12-01), Atkins
patent: 3440174 (1969-04-01), Albrecht
patent: 3822216 (1974-07-01), Schaefer

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