METAL-FREE PHTHALOCYANINE PIGMENT POWDER EXCELLENT IN ELECTROPHOTOGRAPHIC PROPERTY AND ELECTROPHOTOGRAPHIC PHOTORECEPTOR PREPARED BY USING THE SAME

摘要

PURPOSE: To obtain a metal-free phthalocyanine pigment powder which can give an electrophotographic photoreceptor excellent in electrophotographic properties, especially prevention of dark decay, by specifying the S content of the powder to be below a specified value. ;CONSTITUTION: A photosensitive metal-freephthalocyanine pigment powder having an S content of below 0.1wt.% is provided. Although a practical dry pigment powder of a metal-free phthalocyanine practically contains a small amount of contaminants other than C, H and N, not all of them vitally worsens the practical performances. However, the content of S must be severely controlled because S markedly effects dark decay characteristics. An S content of below 0.1% is allowable, and the pigment having such an S content is excellent and useful as an electrophotographic photosensitive pigment reduced in dark decay.;COPYRIGHT: (C)1994,JPO&Japio