Preparation of pigments having improved technological properties

Details Preparation of pigments having improved technological properties Preparation of pigments having improved technological properties

1980-06-06

1983-02-01

Coughlan, Jr., Paul M.

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

Organic compounds

Nitrogen attached directly or indirectly to the purine ring...

106288Q, C09B 5704

Patent

active

043717357

ABSTRACT:
A process for the preparation of an easily dispersible pigment, of high tinctorial strength, having the formula ##STR1## where A is cyano, carbonamido, N-phenyl or N-(chlorophenyl)-carbonamido or is a 5-membered or 6-membered unsaturated heterocyclic ring fused to a benzene ring and B is a barbituric acid radical, by condensing 1-amino-3-imino-insoindoline with the appropriate cyanomethylene compound at pH>7 and then with barbituric acid at pH 1.5-3.5, in an aqueous medium or in water, at from 20.degree. to 150 C. The process may be used to produce high-hiding or transparent pigments which give brilliant colorations.

REFERENCES:
patent: 3646033 (1972-02-01), Leister et al.
patent: 4166179 (1979-08-01), Lotsch

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