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US 5,292,551 AGranted
Process for producing electroconductive powders
AssigneeE. I. Du Pont de Nemours and Company
InventorHoward W. Jacobson
Life of this patent
Estimating the term…
Abstract
A method for preparing electroconductive powders by applying a surface coating comprising amorphous silica, and an electro-conducting network of antimony-containing tin oxide crystallites. The process simultaneously applys silica in association with an antimony-containing tin oxide.
Claims11
A process for making an electroconductive powder comprising a particulate substrate and a coating comprising silica and an electroconducting network of antimony-containing tin oxide, said method comprising the steps of:
- (a) providing an aqueous suspension comprising the particulate substrate;
- (b) applying a coating comprising silica associated with a hydrous antimony-containing tin oxide onto the particulate substrate;
- wherein the silica and hydrous antimony-containing tin oxide are simultaneously applied onto the particulate substrate and wherein the pH of the suspension during said applying is maintained in the range of about 1.0 to about 4.0;
- (c) recovering solids from the suspension, washing said solids, and drying the recovered solids;
- and
- (d) calcining the recovered solids, thereby obtaining the electroconductive powder.
3 more elements
A process for making a coated powder comprising the steps of:
- (a) providing a suspension comprising at least one particulate substrate material,
- (b) applying a coating comprising amorphous silica associated with a hydrous antimony-containing tin oxide onto said particulate substrate;
- wherein the silica and hydrous antimony-containing tin oxide are simultaneously applied onto the particulate substrate and wherein the pH of the suspension during said applying is maintained in the range of about 1.0 to about 4.0,
- (c) recovering solids from the suspension, washing said solids, and;
- (d) heating the solids at a temperature and for a time sufficient to convert at least a portion of the hydrous antimony-containing tin oxide to an antimony-containing tin oxide,
- (e) optionally continuing said heating at a temperature and for a time sufficient to calcine at least a portion of said solids;
- thereby obtaining the coated powder.
4 more elements
Dependencies are inferred from the claim text.