Processes for the preparation of titanyl phthalocyanines

Details Processes for the preparation of titanyl phthalocyanines Processes for the preparation of titanyl phthalocyanines

1993-03-01

1994-09-27

Shah, Mukund J.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

430 78, 540140, 540142, 540143, C09B 6750

Patent

active

053508440

ABSTRACT:
A process for the preparation of a more perfect crystalline form of the Type I polymorph of titanyl phthalocyanine which comprises dissolving a precursor titanyl phthalocyanine Type I in a solution of trihaloacetic acid and alkylene chloride; adding the resultant solution to a solvent thereby enabling precipitation of Type X titanyl phthalocyanine; separating the titanyl phthalocyanine Type X from the solution; followed by a first washing with an organic solvent and a second washing with water; slurrying the resulting Type X titanyl phthalocyanine in an organic solvent enabling conversion of said Type X to Type IV titanyl phthalocyanine; and thereafter, subjecting the Type IV titanyl phthalocyanine obtained to treatment with an organic solvent to enable said crystalline form of titanyl phthalocyanine Type I.

REFERENCES:
patent: 5164493 (1992-11-01), Mayo et al.
patent: 5166339 (1992-11-01), Duff et al.
patent: 5182382 (1993-01-01), Mayo et al.
patent: 5189155 (1993-02-01), Mayo et al.

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