Process for preparing hydroxygallium phthalocyanine crystals and

Details Process for preparing hydroxygallium phthalocyanine crystals and Process for preparing hydroxygallium phthalocyanine crystals and

1993-03-29

1995-10-17

Chapman, Mark A.

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Radiation-sensitive composition or product

430 76, G03G 500

Patent

active

054590043

ABSTRACT:
A process for preparing hydroxygallium phthalocyanine crystals showing intense diffraction peaks at Bragg angles (2.theta..+-.0.2) of 7.5.degree., 25.1.degree., and 28.3.degree. with respect to CuK.sub..alpha. characteristic X-rays which comprises mechanically grinding hydroxygallium phthalocyanine and then treating the grains with a solvent is disclosed. The hydroxygallium phthalocyanine crystals obtained by the process of the present invention has a novel crystal form and exhibits high sensitivity and excellent durability on repeated use as well as crystal form stability. The electrophotographic photoreceptor prepared by using the resulting hydroxygallium phthalocyanine exhibits excellent electrophotographic characteristics.

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Denshishashin Gakkaishi, vol. 28, No. 3, pp. 269-273 (1989).

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