Patent ID: 7407606
Filing Date: 2008-08-05
Classification: C01G,C01P,C09C,H01B

Abstract:
1. A method for producing an electroconductive powder which comprises adding an aqueous acidic solution in which a tin compound and a phosphorus compound are dissolved and an aqueous alkaline solution to an aqueous suspension of titanium dioxide in which the content of a metallic element having a valence of 4 or less contained in the titanium dioxide as an impurity is 0.02 or less as (B) obtained by the following formula (2) (in the above formula, M′ 1 , M′ 2 , M′ 3 , M′ 4 , . . . , M′ Y represent an atomic ratio of each metallic element having a valence of 4 or less, the atomic ratio being to Ti of titanium dioxide, n′ 1 , n′ 2 , n′ 3 , n′ 4 , . . . , n′ Y represent a valence number of each metallic element having the atomic ratio of M′ 1 , M′ 2 , M′ 3 , M′ 4 , . . . , M′ Y , Y in M′ Y and n′ Y represents the number of the metallic element contained in the titanium dioxide and can have a natural number of 1 or more, with maintaining pH of the aqueous suspension in the range of 2-6 or 8-12, then fractionating the resulting product, and firing the product in an air or in an atmosphere of low oxygen concentration at a temperature of 600-925° C. to form an electroconductive layer containing tin oxide and phosphorus on the surface of the titanium dioxide.