Patent ID: 6726856
Filing Date: 2004-04-27
Classification: C01P,C09C,H01B

Abstract:
A process for preparing electrically conductive pigments comprising an Fâˆ’- and/or PO43âˆ’-doped tin mixed oxides electrically conductive layer on a substrate, said process comprisingcoating a substrate with tin(IV) oxide hydrate by adding a hydrolysable tin(IV) compound to an aqueous solution containing the substrate in suspended form, at a pH and temperature which permit complete hydrolysis of the tin(IV) compound, separating the substrate from the suspension, optionally washing and drying, and calcining at a temperature between 600 and 1000Â° C. to form a substrate coated with a layer of SnO2, and converting the SnO2 layer into a tin mixed oxide layer doped with Fâˆ’ and/or PO43âˆ’.