| 摘要 |
PURPOSE:To enhance whiteness, naturalness, and contrast, by heat treating zinc oxide together with sulfur added in manufacturing a conductive zinc oxide powder. CONSTITUTION:A conductive zinc oxide powder usable for the conductive layer of an electrostatic recording material is obtained ordinarily by mixing zinc oxide with a dopant, such as aluminum oxide, and heat treating them in a reducing atmosphere, but the obtained zinc oxide powder develops color, lowering and impairing the whiteness and the naturalness of the recording material. Addition of sulfur in the heat treatment permits the obtained zinc oxide powder to color very little, and exhibits excellent conductivity even though heat treatment temperature as low as 600-900 deg.C. An electrostatic recording material is obtained by forming a conductive layer consisting of the obtained highly white conductive zinc oxide powder and a binder on a support and providing a dielectric layer on it. |
