Direct alpha to x phase conversion of metal-free phthalocyanine

G - Physics – 03 – G

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96/174, 96/210,

G03G 5/00 (2006.01) G03G 5/06 (2006.01)

Patent

CA 1048329

ABSTRACT Process for direct alpha to X phase conversion of metal-free phthalocyanine. In this process, the alpha polymorph of a metal-free phthalocyanine pigment can be directly converted to the X form by depositing the alpha form of the pigment on a suitable substrate followed by in situ conversion of this deposit by controlled heating. The X form of metal-free phthalocyanine is known to possess good electrophotographic speed, and, thus, can be used either along or in combination with other photocon- ductive material in electrophotography.

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