Process for preparing .chi.-form metal free phthalocyanine
AssigneeOrient Chemical Industries, Ltd.
InventorsYasuhiro Yamasaki, Kazuyoshi Kuroda
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Abstract
A process for preparing .chi.-form metal free phthalocyanine comprising: dry milling amorphous-like .alpha.-form metal free phthalocyanine to form .chi.-form metal free phthalocyanine partially; and wet milling or dispersing with stirring the resulting polymorph mixture in the presence of a cyclic organic solvent comprising an amide moiety. A simple process for preparing high-pure .chi.-form H2-Pc suitable as a charge generating meterial of an organic photoreceptor is provided, by improving the conventional technique for preparing .chi.-form H2-Pc.
Claims7
A process for preparing .chi.-form metal free phthalocyanine comprising:
- dry milling amorphous-like .alpha.-form metal free phthalocyanine to form .chi.-form metal free phthalocyanine partially;
- and
- wet milling or dispersing with stirring the resulting polymorph mixture in the presence of a cyclic organic solvent comprising an amide moiety.
Dependencies are inferred from the claim text.