Methods for preparing cocrystals of titanyl fluorophthalocyannes and unsubstituted titanyl phthalocyanine, electrophotographic elements, and titanyl phthalocyanine compositions
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United States of America Patent
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Jun 16, 1998
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app pub date -
Oct 23, 1996
filing date -
May 2, 1995
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Abstract
Amorphous and cocrystallized unsubstituted titanyl phthalocyanine-titanyl fluorophthalocyanine compositions, preparation methods, and electrophotographic elements utilizing the compositions. The method has the steps of: admixing crude titanyl phthalocyanine and crude titanyl fluorophthalocyanine to provide a pigment mixture; increasing the amorphousness of the pigment mixture as determined by X-ray crystallography using X-radiation characteristic of Cu K.alpha. at a wavelength of 1.541 .ANG. of the Bragg angle 2.theta. to provide an amorphous pigment mixture; contacting the amorphous pigment mixture with a non-crystallizing solvent.
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