Preparation of a coupling product of bisiazotized 2,2',5,5'-tetr

Details Preparation of a coupling product of bisiazotized 2,2',5,5'-tetr Preparation of a coupling product of bisiazotized 2,2',5,5'-tetr

1991-04-30

1993-03-16

Higel, Floyd D.

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

Organic compounds

Azo

534581, 534582, 534747, C09B 35035, C09B 6720, C09D 1162, D06P 144

Patent

active

051945975

ABSTRACT:
The industrial preparation of C.I. Pigment Yellow 81 by conventional coupling methods has the disadvantage that traces of polychlorinated biphenyls are formed in the course of the reaction of the two components.
The invention now provides that the addition of quaternary dialkyldiallylammonium compounds during the azo coupling will decisively suppress the PCB-forming secondary reactions during the pigment synthesis.

REFERENCES:
patent: 2261626 (1941-11-01), Lang
patent: 3025287 (1962-03-01), Ribka
patent: 3112303 (1963-11-01), Inman
patent: 3120508 (1964-02-01), Braun et al.
patent: 3165507 (1965-01-01), Braun et al.
patent: 3172883 (1965-03-01), Inman
patent: 3444157 (1969-05-01), Tanaka et al.
patent: 4665163 (1987-05-01), Hunger et al.

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