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US 5,476,613 AGranted
Electroconductive material and process
AssigneeE. I. Du Pont de Nemours and Company
InventorHoward W. Jacobson
Life of this patent
Estimating the term…
Abstract
A process for producing crystallites comprising silica and antimony containing tin oxide. The quantity of antimony within the tin oxide can be reduced, thereby permitting production a powder which is absent a blue coloration.
Claims14
A process for preparing an electroconductive powder, which comprises the steps of:
- (a) contacting an aqueous alkali silicate solution with at least one solution which comprises tin and antimony salts, optionally in the presence of a Group IIA metal cation, and while maintaining the pH at about 2.0 or less, and the temperature in the range of about 25.degree. to 100.degree. C.,
- (b) recovering a precipitate which comprises silica and hydrous oxides of tin and antimony, washing and drying the precipitate;
- and
- (c) calcining the dried precipitate at a temperature of about 500.degree. to 900.degree. C., thereby obtaining an electroconductive powder comprising silica and an antimony-containing tin oxide.
1 more element
A process for obtaining an electroconductive powder comprising the steps of:
- (a) concurrently contacting at least one aqueous solution which comprises an alkali silicate with at least one other solution which comprises tin and antimony salts, optionally performing said contacting in the presence of at least one member selected from the group consisting of Group IIA metal cations, alkali metals, alkaline earth metals, transition metals and rare earth metals,
- (b) controlling the pH to be at about 2.0 or less and temperature such that a precipitate is formed which comprises silica and hydrous oxides of tin and antimony,
- (c) heating the precipitate for a time and at a temperature sufficient to obtain an electroconductive powder comprising a mixture of silica and an antimony-containing tin oxide.
Dependencies are inferred from the claim text.