| abstract |
Crystals of hydroxygallium phthalocyanine, a method of preparing the crystals, a photoconductive material containing the crystals, and an electrophotographic photoreceptor having the material. The photoreceptor has excellent electrophotographic characteristics. The crystals of hydroxygallium phthalocyanine have distinct diffraction peaks at (i) 7.5 DEG , 9.9 DEG , 12.5 DEG , 16.3 DEG , 18.6 DEG , 25.1 DEG and 28.3 DEG , or (ii) 7.7 DEG , 16.5 DEG , 25.1 DEG and 26.6 DEG , or (iii) 7.9 DEG , 16.5 DEG , 24.4 DEG and 27.6 DEG , or (iv) 7.0 DEG , 7.5 DEG , 10.5 DEG , 11.7 DEG , 12.7 DEG , 17.3 DEG , 18.1 DEG , 24.5 DEG , 26.2 DEG and 27.1 DEG , or (v) 6.8 DEG , 12.8 DEG , 15.8 DEG and 26.0 DEG or (vi) 7.4 DEG , 9.9 DEG , 25.0 DEG , 26.0 DEG , and 28.2 DEG of the Bragg angle (2 theta +/-0.2) in the X-ray diffraction spectrum. The electrophotographic photoreceptor has a light-sensitive layer containing the photoconductive material of the crystals. |