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AssigneeFuji Xerox Co., Ltd.
InventorsFumiaki Tambo, Katsumi Daimon, Yasuo Sakaguchi, Kazuo Yamasaki
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Hydroxygallium phthalocyanine crystals having intense diffraction peaks at Bragg angles (2.theta..+-.0.2.degree.) of 7.5.degree., 9.9.degree., 12.5.degree., 16.3.degree., 18.6.degree., 25.1.degree. and 28.3.degree. 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.
A process for producing a hydroxygallium phthalocyanine crystal, which comprises reacting a gallium compound with a compound for forming a phthalocyanine ring in a ratio of greater than 1:1 equivalent of the compound for forming the phthalocyanine ring to the gallium compound to prepare gallium phthalocyanine, subjecting the resulting gallium phthalocyanine to acid pasting to obtain a hydroxygallium phthalocyanine crystal having intense diffraction peaks at Bragg angles (2.theta..+-.0.2.degree.) of 6.9.degree., 13.2.degree. to 14.2.degree., 16.5.degree. and 26.4.degree. or of 7.0.degree., 13.4.degree., 16.6.degree., 26.0.degree. and 26.7.degree. in CuK.alpha. characteristic X-ray diffractometry, and transforming the resulting crystal by a solvent treatment into a hydroxygallium phthalocyanine crystal having intense diffraction peaks at Bragg angles (2.theta..+-.0.2.degree.) of 7.5.degree., 9.9.degree., 12.5.degree., 16.3.degree., 18.6.degree., 25.1.degree. and 28.3.degree. in CuK.alpha. characteristics X-ray diffractometry.
A process for producing a hydroxygallium phthalocyanine crystal, which comprises removing an insoluble matter from an acid paste of gallium phthalocyanine in an acid pasting process to prepare a hydroxygallium phthalocyanine crystal having intense diffraction peaks at Bragg angles (2.theta..+-.0.2.degree.) of 6.9.degree., 13.2.degree. to 14.2.degree., 16.5.degree. and 26.4.degree. or of 7.0.degree., 13.4.degree., 16.6.degree., 26.0.degree. and 26.7.degree. in CuK.alpha. characteristic X-ray diffractometry, and transforming the resulting crystal by a solvent treatment into a hydroxygallium phthalocyanine crystal having intense diffraction peaks at Bragg angles (2.theta..+-.0.2.degree.) of 7.5.degree., 9.9.degree., 12.5.degree., 16.3.degree., 18.6.degree., 25.1.degree. and 28.3.degree. in CuK.alpha. characteristic X-ray diffractometry.
A hydroxygallium phthalocyanine crystal having intense diffraction peaks at Bragg angles (2.theta..+-.0.2.degree.) of 7.5.degree., 9.9.degree., 12.5.degree., 16.3.degree., 18.6.degree., 25.1.degree. and 28.3.degree. in CuK.alpha. characteristic X-ray diffractometry, which are obtained by a process comprising reacting a gallium compound with a compound for forming a phthalocyanine ring in a ratio of greater than 1:1 equivalent of the compound for forming the phthalocyanine ring to the gallium compound to prepare gallium phthalocyanine, subjecting the resulting gallium phthalocyanine to acid pasting to obtain a hydroxygallium phthalocyanine crystal having intense diffraction peaks at Bragg angles (2.theta..+-.0.2.degree.) of 6.9.degree., 13.2.degree. to 14.2.degree., 16.5.degree. and 26.4.degree. or of 7.0.degree., 13.4.degree., 16.6.degree., 26.0.degree. and 26.7.degree. in CuK.alpha. characteristic X-ray diffractometry, and transforming the resulting crystal by a solvent treatment.
A hydroxygallium phthalocyanine crystal having intense diffraction peaks at Bragg angles (2.theta..+-.0.2.degree.) of 7.5.degree., 9.9.degree., 12.5.degree., 16.3.degree., 18.6.degree., 25.1.degree. and 28.3.degree. in CuK.alpha. characteristic X-ray diffractometry, which are obtained by a process comprising removing an insoluble matter from an acid paste of gallium phthalocyanine in an acid pasting process to prepare a hydroxygallium phthatocyanine crystal having intense diffraction peaks at Bragg angles (2.theta..+-.0.2.degree.) of 6.9.degree., 13.2.degree. to 14.2.degree., 16.5.degree. and 26.4.degree. or of 7.0.degree., 13.4.degree., 16.6.degree., 26.0.degree. and 26.7.degree. in CuK.alpha. characteristic X-ray diffractometry, and transforming the resulting crystal by a solvent treatment.
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