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US 4,732,750 AGranted
Preparation of monodisperse titania by titanium alkoxide hydrolysis
AssigneeAllied-Signal Inc.
InventorsWilliam L. Olson, William E. Liss
Life of this patent
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Abstract
This invention relates to a process for reproducibly forming monodisperse titania spheres by the hydrolysis of titanium alkoxides in the presence of an amine containing additive in such a way as to constrain the particle size within a narrow range.
Claims13
A process for the production of monodisperse titania particles comprising the steps of:
- (a) dissolving titanium tetraalkoxide in an alcoholic medium to form a solution of said alkoxide in said alcoholic medium;
- (b) providing a hydrolysis solution comprising alcohol and water in amounts sufficient to hydrolyze said alkoxide in said solution;
- (c) adding said hydrolysis solution to said solution of said alkoxide to hydrolyze said alkoxide at hydrolysis conditions to form a dispersion of monodisperse titania particles, said hydrolysis being conducted in the presence of a component selected from the group consisting of (1) monoalkyl amines, (2) dialkyl amines, (3) trialkyl amines in combination with hydroxypropylcellulose and (4) mixtures thereof, said alkyl substituent having from 1 to 7 carbon atoms;
- and
- (d) separating and recovering said monodisperse titania particles from said dispersion.
2 more elements
Dependencies are inferred from the claim text.