Process of preparing pyranthrone pigments

Details Process of preparing pyranthrone pigments Process of preparing pyranthrone pigments

1978-01-17

1979-03-20

Curtis, Allen B.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C09B 344

Patent

active

041453565

ABSTRACT:
Pyranthrone pigments of the formula ##STR1## WHEREIN N IS 0 OR 1, WHEREIN WHEN N IS 0, EACH A is hydrogen or chlorine, and when n is 1, each A is chlorine are prepared by crystallizing a finely divided crude pyranthrone pigment in an organic polar solvent, in the presence of from 0.5 to 10% by weight, based on the crude pigment, of an anthraquinone compound of the formula ##STR2## WHEREIN X is chlorine, Y is alkyl of 1 to 4 carbon atoms, hydroxyl, carboxyl, carbo-alkoxy, wherein said alkoxy group has 1 to 4 carbon atoms, or carbophenoxy, p is 0, 1 or 2 and m is 0, 1 or 2.

REFERENCES:
patent: 1596528 (1926-08-01), Gubelmann
patent: 2055699 (1936-09-01), Ogilvie et al.
Chemical Abstracts, vol. 76, Jan. 23, 1971, p. 80, abstract No. 61054m, Nakano et al., "Stabile Orange Pigment in Organic Solvent".

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