Method of making hydroxygallium phthalocyanine type V photocondu

Details Method of making hydroxygallium phthalocyanine type V photocondu Method of making hydroxygallium phthalocyanine type V photocondu

1994-10-31

1996-01-09

Martin, Roland

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Process of making radiation-sensitive composition

430133, 430 58, 540141, G03G 506, G03G 5047

Patent

active

054828112

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: 5166339 (1992-11-01), Duff et al.
patent: 5189155 (1993-02-01), Mayo et al.
patent: 5189156 (1993-02-01), Mayo et al.
patent: 5407766 (1995-04-01), Mayo et al.
patent: 5418107 (1995-05-01), Nealey et al.
Bull. Soc. Chim. Fr., 23 (1962), "No. 2 Study of Some Phalocyanine Derivatives, Discussion on the Various Routes of Preparation, I-Phthalocyanines With Elements of Valence Greater Than Two", Mrs. Denise Colaitis.

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