| 摘要 |
PURPOSE:To provide titled cadmium sulfide which does not contain any donor impurities, is highly resistant to heat and gives a photoreceptor causing no fluctuations in contrast of electrostatic images by temps., by using a water soluble Cd salt containing no elements to form donor impurities as a raw material. CONSTITUTION:Hydrogen sulfide is blown into an aqueous soln. of a water soluble cadmium salt such as cadmium sulfate containing no elements to form donor impurifies such as Cl, Br, Al and the like to allow cadmium sulfide to precipitate. After the precipitated cadmium sulfide is rinsed and dried, it is fired, whereby the intended cadmium sulfide contg. no donor impurities for electrophotography is obtained. More preferably, copper is added as an acceptor impurity, during production process of the cadmium sulfide. The resultant cadmium sulfide is highly resistant to heat, and a photoreceptor for electrophotography of superior performance is obtained by using such cadmium sulfide as a photoconductive material for a photoconductive layer constituting electrophotographic receptors. |
