Hydroxygallium phthalocyanine photoconductive imaging members

Details Hydroxygallium phthalocyanine photoconductive imaging members Hydroxygallium phthalocyanine photoconductive imaging members

1995-06-06

1996-10-08

Shah, Mukund J.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

540139, 540142, 540140, C09B 6712

Patent

active

055632610

ABSTRACT:
A process for the preparation of hydroxygallium phthalocyanines which comprises hydrolyzing a gallium phthalocyanine precursor pigment by dissolving said hydroxygallium phthalocyanine in a strong acid and then reprecipitating the resulting dissolved pigment in basic aqueous media; removing any ionic species formed by washing with water, concentrating the resulting aqueous slurry comprised of water and hydroxygallium phthalocyanine to a wet cake; removing water from said slurry by azeotropic distillation with an organic solvent, and subjecting said resulting pigment slurry to mixing with the addition of a second solvent to cause the formation of said hydroxygallium phthalocyanine polymorphs.

REFERENCES:
patent: 5350844 (1994-09-01), Martin et al.
patent: 5360475 (1994-11-01), Nukada et al.

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