Process for manufacture of benzidine pigments

Details Process for manufacture of benzidine pigments Process for manufacture of benzidine pigments

1975-10-02

1978-02-21

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

106288Q, 260143, 260176, 260182, 260510, 260518R, 260569, C07C10904, C07C10906, C09B 3510, C09B 3518

Patent

active

040751988

ABSTRACT:
Benzidine pigments are very effectively made by reducing certain azoxybenzenes with technical NaHS to form in good yield a corresponding hydrazobenzene which can be further reacted in crude condition to make the pigment.

REFERENCES:
patent: 1998488 (1935-04-01), Calcott et al.
patent: 2570866 (1951-10-01), Sargent et al.
patent: 2600000 (1952-06-01), Kamlet
patent: 2640081 (1953-05-01), Farkas et al.
patent: 2765301 (1956-10-01), Cashion
patent: 2966519 (1960-12-01), Cashion
patent: 3821190 (1974-06-01), Buckwalter
patent: 3917701 (1975-11-01), Cousino
Hashimoto et al. (I), Chemical Abstracts, vol. 60, 437b-c (1964).
Hashimoto et al. (II), Chemical Abstracts, vol. 62, 3960-3961 (1965).
Hashimoto et al. (III), Chemical Abstracts, vol. 66, #'s 64835w and 64836x, (1967).

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