Novel form of the disazo pigment from bisdiazotized 3,3'-dichlor

Details Novel form of the disazo pigment from bisdiazotized 3,3'-dichlor Novel form of the disazo pigment from bisdiazotized 3,3'-dichlor

1975-09-24

1976-09-14

Warren, Charles F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260208, 106288Q, C09B 4300

Patent

active

039806359

ABSTRACT:
A highly covering disazo pigment having the chemical constitution ##SPC1##
Which is characterized by a specific surface of 12 - 30, preferably 15 to 25, m.sup.2 /g, a maximum of the grain size distribution of between 250 and 500 nm and a proportion of these grain sizes in the total distribution of 35 - 65 percent, preferably 45 - 60 percent. This new pigment form is obtained by heating the pigment obtained after coupling with a solvent which is immiscible with water or miscible with water to a limited degree only to temperatures above 100.degree.C.

REFERENCES:
patent: 3124565 (1964-03-01), Schilling et al.
patent: 3127412 (1964-03-01), Gaertner et al.
patent: 3137686 (1964-06-01), Dietz et al.
patent: 3567707 (1971-03-01), Neave et al.
Colour Index, Third Ed., vol. 3, 1971, p. 3295.
Colour Index, Third Ed., vol. 4, 1971, p. 4155.
Wincke, Farbe Undlack, vol. 75, 1969, pp. 632-637.

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