Titanyloxyphthalocyanine crystals, and method of preparing the s

Details Titanyloxyphthalocyanine crystals, and method of preparing the s Titanyloxyphthalocyanine crystals, and method of preparing the s

1998-01-26

1999-02-23

Shah, Mukund J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

540140, 540122, 430 59, 430 58, 430 78, 430 83, C09B 6750, G03G 5047

Patent

active

058745700

ABSTRACT:
A titanyloxyphthalocyanine crystal to be used as a charge generation material for an electrophotographic photoreceptor, having a maximum diffraction intensity observed at Bragg angle (2 .theta.) of 9.6.degree..+-.0.2.degree. and clear peaks of diffraction intensity observed at 7.22.degree..+-.0.2.degree., 9.60.degree..+-.0.2.degree., 11.60.degree..+-.0.2.degree., 13.40.degree..+-.0.2.degree., 14.88.degree..+-.0.2.degree.,18.34.degree..+-.0.2.degree., 23.62.degree..+-.0.2.degree., 24.14.degree..+-.0.2.degree., and 27.32.degree..+-.0.2.degree., respectively, in an X-ray diffraction spectrum obtained by performing an x-ray diffraction method using CuK.alpha. as a source of radiation. A method for preparing the crystal includes dispersing a predetermined amount of amorphous titanyloxyphthalocyanine in an aqueous solution in which ionic substances are dissolved, under mechanical force at a temperature of under 50.degree. C., to obtain a mixture composed of a fine dispersion of titanyloxyphthalocyanine; adding a non-aqueous organic solvent to the mixture to shift the fine dispersion of titanyloxyphthalocyanine from an aqueous phase to a non-aqueous organic solvent phase; and removing the non-aqueous organic solvent phase to obtain a pellet of titanyloxyphthalocyanine crystal.

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