Preparation of flavanthrone pigment

Details Preparation of flavanthrone pigment Preparation of flavanthrone pigment

1975-04-24

1976-06-08

Coughlan, Jr, Paul M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260673, C09B 522

Patent

active

039622517

ABSTRACT:
A process for producing a new crystalline polymorphic form of flavanthrone is disclosed which comprises treating crude flavanthrone with nitric acid. This new form exhibits only one prominent X-ray diffraction peak between 7.00 and 8.00 dA and only two prominent peaks between 3.30 and 3.75 dA. In contrast to the known form of flavanthrone, the new form exhibits desirable transparent mass tones when employed as a pigment.

REFERENCES:
patent: 2611771 (1952-09-01), Marnon
patent: 3660407 (1972-05-01), Kay et al.

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