Modified form of a disazo pigment

Details Modified form of a disazo pigment Modified form of a disazo pigment

1974-01-17

1976-08-10

Warren, Charles F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260208, 106288Q, C09B 4300

Patent

active

039741362

ABSTRACT:
The disazo pigment of the formula ##SPC1##
Characterized by a specific surface of 12 - 20, preferably 13 - 18 m.sup.2 /g, a maximum of the distribution of the grain sizes of between 500 and 1000 nm and a proportion of these grain sizes in the total distribution of between 35 and 65 %. This disazo pigment is obtained by isolating the pigment, after coupling, by stirring it out with alkali and, after having filtered it and washed it to neutrality, heating it to temperatures above 100.degree. C in a mixture of water and a solvent which is immiscible with water or miscible with water to a limited degree only.

REFERENCES:
patent: 3169955 (1965-02-01), Siebert et al.
patent: 3711461 (1973-01-01), Pretzer et al.

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