| 摘要 |
Hydroxygallium phthalocyanine crystals having intense diffraction peaks at Bragg angles (2 theta +/-0.2 DEG ) of 7.5 DEG , 9.9 DEG , 12.5 DEG , 16.3 DEG , 18.6 DEG , 25.1 DEG and 28.3 DEG in Cuk alpha characteristic X-ray diffractometry, a process for producing the same, and an electrophotographic photoreceptor containing the same are disclosed. The hydroxygallium phthalocyanine crystals are obtained by once preparing impurity-free hydroxygallium phthalocyanine having intense X-ray diffraction peaks at specific Bragg angles, followed by a solvent treatment for crystal transformation, in which the impurity-free crystals are prepared by using excess phthalocyanine ring-forming compound in the synthesis of starting gallium phthalocyanine or by removing insoluble matter from the acid paste of starting gallium phthalocyanine.
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