Manufacture of a pigmentary form of .alpha.-indanthrone

Details Manufacture of a pigmentary form of .alpha.-indanthrone Manufacture of a pigmentary form of .alpha.-indanthrone

1978-02-03

1979-09-11

Coughlan, Jr., Paul M.

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

Organic compounds

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

260 4221, C09B 548

Patent

active

041676343

ABSTRACT:
An .alpha.-indanthrone pigment having improved tinctorial and technological properties is produced by swelling .gamma.-indanthrone in sulfuric acid of from 73 to 80 percent strength by weight at from 20.degree. to 50.degree. C. in the presence of from 0.1 to 20% by weight, based on indanthrone, of a hydroxylammonium salt, a hydrazinium salt, amidosulfonic acid, urea, a salt of urea, formaldehyde or paraformaldehyde or a mixture of these. After precipitation in water which may or may not contain a surfactant, at below 50.degree. C., an .alpha.-indanthrone pigment of high tinctorial strength is obtained, which gives clear and pure colorations and is easily dispersible.

REFERENCES:
patent: 1899348 (1933-02-01), Neresheimer et al.
patent: 2065928 (1936-12-01), Waldron

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