Process for the preparation of pigments of the anthanthrone seri

Details Process for the preparation of pigments of the anthanthrone seri Process for the preparation of pigments of the anthanthrone seri

1986-06-09

1987-11-10

Clingman, A. Lionel

Compositions: coating or plastic

Materials or ingredients

106289, 106309, 260350L, 260359, C08K 508, C09B 360, C09B 6754

Patent

active

047055723

ABSTRACT:
Process for the preparation of pigments of the anthanthrone series of the formula ##STR1## in which R.sub.1 and R.sub.2 denote chlorine, bromine or iodine atoms or C.sub.1 -C.sub.4 -alkoxy groups, having valuable properties, which comprises first converting the anthanthrones of the formula mentioned, in the form of the crude pigment, in an aqueous alkaline medium and at a pH>10, into the leucoform, precipitating the latter by adding inorganic or organic acids, reoxidizing the aqueous suspension of the leuco-form to give the anthanthrones and subjecting the resulting finely divided pre-pigments of the formula mentioned to a solvent finish.

REFERENCES:
patent: 2032458 (1936-03-01), Adamson
patent: 3265699 (1966-08-01), Jaffe
E. R. Trotman, "Dyeing and Chemical Technology of Textile Fibres", S4th Edition, (Wiley-Interscience), 1984, pp. 432-433.
Fiat 1313, vol. 11/1.

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