Process for preparing a water repellent silica sol

Details Process for preparing a water repellent silica sol Process for preparing a water repellent silica sol

1994-07-28

1997-07-29

Lovering, Richard D.

Compositions

Inorganic luminescent compositions

Tungsten containing

556458, 252314, 10628734, B01J 1300, C07F 708

Patent

active

056519214

ABSTRACT:
A water repellent silica sol comprises colloidal silica particles of a size of 100 nm or less whose surfaces have been made water-repellent by an organic group-substituted silane. The water repellent silica sol is produced by a process which comprises reacting a silica colloid dispersed in a non-polar organic solvent with an organic group-substituted silane so that the surfaces of the colloidal silica particles are made water-repellent by the organic group-substituted silane. Alternatively, the water repellent silicate sol is prepared by a process which comprises adding a non-polar organic solvent, a cationic surface active agent and an organic group-substituted silane to a water-dispersed silica colloid, forming an emulsion therefrom, removing water from the emulsion by azeotropic dehydration and refluxing the emulsion under heating.

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Patent Abstracts of Japan, J58-145614, vol. 53C, #196, Aug. 30, 1983.
Derwent Abstract, AN 83-780575/40 (corresponding to J90-001090-B) (1983).

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