Process for the preparation of bisazo pigments in halogen-free s

Details Process for the preparation of bisazo pigments in halogen-free s Process for the preparation of bisazo pigments in halogen-free s

1992-01-30

1993-02-09

Higel, Floyd D.

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

Organic compounds

Azo

534745, 534748, 534819, 534828, 534829, 534830, C09B 43124, C09B 43132, C09B 4312

Patent

active

051854350

ABSTRACT:
The present invention relates to the preparation of bisazo pigments by reaction (a) of 2 mol of an azocarbonyl chloride of the formula ##STR1## with 1 mol of a diamine of the formula ##STR2## by reaction (b) of one mole of a bis(azocarbonyl chloride) of the formula ##STR3## with 2 mol of an amine of the formula ##STR4## which comprises carrying out the reactions (a) or (b) in the presence of 1,2,3-trimethylbenzene or anisole as the solvent.

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patent: 4719293 (1988-01-01), Ronco

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