ACICULAR ELECTRICALLY CONDUCTIVE TITANIUM OXIDE AND ITS PRODUCTION

摘要

PURPOSE:To remarkably decrease electric resistance of powder by adding a soln. of stannic chloride and a soln. of antimony chloride to an aq. suspension of high pure titanium oxide treated with acid and forming a coating layer on the surface of said titanium oxide. CONSTITUTION:Impurity consisting of phosphorous compd. and compd. of <=3 valency metal is removed from acicular titanium oxide having 1-10mum length and >=3 aspect ratio by treating said titanium oxide with acid and/or alkali. Thereby, the content of phosphorous compd. is made <=1wt.% (calculated in term of P2O5) and the content of the compd. of <=3 valency metal is made <=0.2wt.% (expressed in terms of oxide). The soln. of tin chloride and the soln. of antimony chloride are added to the aq. suspension of the high pure titanium oxide contg. <=3wt.% impurity. Thus, the coating layer consisting of hydrate of tin oxide and antimony oxide is formed on the surface of said high pure titanium oxide. Then, the above-mentioned titanium oxide is separated and calcined.