Process for preparing conductive acicular zinc oxide

US5171364A · kind A · utility

Assignees

• MITSUI MINING & SMELTING CO., LTD. · JP
• Metallgesellschaft AG · DE

Inventors

• Norihiro Sato · Shimonoseki, JP
• Takao Hayashi · Shimonoseki, JP
• Nobuyoshi Kasahara · Saitama, JP
• Wolf-Dieter Griebler · Moers, DE
• Jorg Hocken · Düsseldorf, DE
• Gunther Rudolph · Neuberg, DE

Key dates

• Filing date: Nov 13, 1991
• Grant date: Dec 15, 1992
• Expiry date: Nov 13, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/60
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing a conductive, acicular zinc oxide, comprising the steps of: preparing a zinc oxide slurry comprising an acicular zinc oxide, a salt of at least one metal selected from the group consisting of aluminum, gallium, indium and tin and an aqueous solution of an alkali metal hydroxide and having a pH value maintained at 10 to 13, adjusting the pH value of said zinc oxide slurry to 5 to 9 while stirring, aging the slurry, separating the zinc oxide present in the slurry by filtration, washing and drying the separated zinc oxide, and then firing the dried zinc oxide at 500.degree. to 700.degree. C. in a reducing atmosphere.