Process for the preparation of azo pigments by diazotizing in a

Details Process for the preparation of azo pigments by diazotizing in a Process for the preparation of azo pigments by diazotizing in a

1977-01-21

1980-01-08

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

106288Q, 260144, 260155, 260157, 260162, 260163, 260176, 260193, 260203, 260204, C09B 2920, C09B 2932, C09B 2936, C09B 2938

Patent

active

041827082

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: 3213080 (1965-10-01), Bloom et al.
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patent: 3642769 (1972-02-01), Moritz et al.
patent: 3711461 (1973-01-01), Pretzer et al.
patent: 3781266 (1973-12-01), Dietz et al.
patent: 3793305 (1974-02-01), Balon

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