The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 07, 1999
Filed:
Nov. 21, 1997
Takao Hayashi, Shimonoseki, JP;
Norihiro Sato, Shimonoseki, JP;
Manabu Hosoi, Omiya, JP;
Nobuyoshi Kasahara, Sayama, JP;
Clemens Aderhold, Krefeld, DE;
Wolf-Dieter Griebler, Moers, DE;
Jorg Hocken, Dusseldorf, DE;
Uwe Rosin, Duisberg, DE;
Gunther Rudolph, Neuberg, DE;
Abstract
The electrically conductive, barium sulfate-containing composition consists of BaSO.sub.4 particles having a surface area of from 0.1 to 150 m.sup.2 /g. The BaSO.sub.4 particles each are provided with a SnO.sub.2 coating having a thickness of 2 to 80 nm and containing from 1 to 15% by weight of the Sb.sub.2 O.sub.3. The electrically conductive, barium sulfate-containing composition is made by a method including the steps of adding a first acidic solution containing 1 to 95% by weight SnCl.sub.4 and a basic solution to an aqueous dispersion from 50 to 800 g/l of BaSO.sub.4 to make a basic mixture having a pH from 9 to 15; then adding an acid to the basic mixture to form an acidic mixture having a pH from 4 to 1; then adding a second acid solution containing 0.5 to 60% by weight of SbCl.sub.3 to the acidic mixture; separating the electrically conductive, barium sulfate-containing composition from the acidic mixture; and drying and igniting the separated electrically conductive, barium sulfate-containing composition at 300 to 800.degree. C.