Azo pigments obtained by diazotizing in a dipolar aprotic organi

Details Azo pigments obtained by diazotizing in a dipolar aprotic organi Azo pigments obtained by diazotizing in a dipolar aprotic organi

1982-11-04

1986-08-19

Higel, Floyd D.

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

Organic compounds

Azo

106288Q, 106308Q, 106309, 534581, 534742, 534787, 534794, 534866, 534887, C09B 4600, C09B 6700, C09B 6720

Patent

active

046070966

ABSTRACT:
Azo pigments are obtained by diazotizing a diazotizable aromatic amine without solubilizing groups in anhydrous dipolar aprotic water-miscible solvents with the stoichiometric amount or a small excess of nitrosylsulfuric acid or nitrosyl chloride, coupling the diazonium compound so obtained with a coupling component and isolating the pigment obtained in usual manner. This process is carried out in homogeneous solution and yields azo pigments the advantageous properties of which cannot be achieved by other methods, for example, the excellent purity, grain softness, narrow range of particle size distribution, excellent dispersibility in plastic materials and color lacquers, high gloss and excellent opacity in color lacquers.

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patent: 3781266 (1973-12-01), Pietz et al.
patent: 3793305 (1974-02-01), Balon
patent: 4182708 (1980-01-01), Landler et al.

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