Process for improving the application properties of disazo pigme

Details Process for improving the application properties of disazo pigme Process for improving the application properties of disazo pigme

1984-07-06

1988-01-19

Higel, Floyd D.

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

Organic compounds

Azo

106 30, 106288Q, 106308Q, 106308S, 106309, 534747, 534887, C09B 35035, D06P 144, C09D 712

Patent

active

047205415

ABSTRACT:
Process for improving the application properties of disazo pigments obtained by coupling bis-diazotized chlorine-substituted 4,4'-diaminobiphenyls with acetoacetylaminobenzenes, which includes adding sulfite ions to the pigment suspension obtained in the coupling and then heating for one half to two hours at 50.degree. to 100.degree. C. The process produces, above all in large scale industrial batches, a product of uniform quality and having acceptable fastness to solvents, overlacquering, migration and bleeding.

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patent: 3974136 (1976-08-01), Hunger et al.
patent: 3991044 (1976-11-01), Conley
patent: 3998645 (1976-12-01), Okamaki et al.
patent: 4124582 (1978-11-01), Ribka et al.

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