Processes for the preparation of bisazo photogenerating pigments

Details Processes for the preparation of bisazo photogenerating pigments Processes for the preparation of bisazo photogenerating pigments

1990-12-14

1992-12-29

Higel, Floyd D.

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

Organic compounds

Azo

106496, 430 57, 430 58, 534561, 534563, 534565, 534575, 534655, 534658, 534751, 534821, 534829, 534887, C09B 3503, C09B 35039, C09B 6754

Patent

active

051752581

ABSTRACT:
A process for the preparation of photogenerating pigments which comprises the reaction of a diaminofluorenone with an alkali nitrite, an acid, and a tetrafluoroborate; thereafter reacting the resulting product with an anilide coupler; and subsequently annealing the product obtained.

REFERENCES:
patent: 4065449 (1977-12-01), Cseh
patent: 4299896 (1981-11-01), Hashimoto et al.
patent: 4314015 (1982-02-01), Hashimoto et al.
patent: 4327999 (1982-05-01), Koller et al.
patent: 4388078 (1983-06-01), Thomas et al.
patent: 4666810 (1987-05-01), Umehara et al.
patent: 4916039 (1990-04-01), Hashimoto et al.
patent: 4925758 (1990-05-01), Hashimoto et al.
patent: 4960435 (1990-10-01), Tunoda et al.

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