Process for the manufacture of formulations of water-insoluble a

Details Process for the manufacture of formulations of water-insoluble a Process for the manufacture of formulations of water-insoluble a

1989-08-14

1990-12-25

Higel, Floyd D.

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

Organic compounds

Azo

534576, 534887, 514150, 8662, 8688, 8689, 8690, 8692, 106496, C09B 2900, C09B 6720, C09B 6744, C09B 6746, C09B 6754

Patent

active

049804596

ABSTRACT:
The invention describes a process for the preparation of formulations of water-insoluble to sparingly soluble azo dyes by simultaneous diazotization and coupling in a single step reaction, filtering the dye dispersion and, if desired, drying the dyestuff, which process comprises carrying out said simultaneous diazotization and coupling by intimately mixing the aqueous solution or suspension of the reactants, in the presence of one or more surface-active agents, concentrating the dilute dye dispersion by membrane separating methods, and at the same time at least partially removing salt and/or acid from the dispersion and converting it into a storage stable liquid formulation or, by drying, into a solid dye formulation.

REFERENCES:
patent: 2938897 (1960-05-01), Armento
patent: 3793305 (1974-02-01), Balon
patent: 3920855 (1975-11-01), Dawson et al.
patent: 3928314 (1975-12-01), Rochat et al.
patent: 3941768 (1976-03-01), Stocker
patent: 4118384 (1978-10-01), Molls et al.
patent: 4225432 (1980-09-01), Booth et al.
patent: 4225432 (1980-09-01), Booth et al.
patent: 4252718 (1981-02-01), Atherton et al.
Strathmann, Chemie-Technik, vol. 7, pp. 333 to 347 (1978).
Pusch, Angew. Chem., vol. 94, pp. 670 to 695 (1982).
Dr. H. Strathmann, Anwendung von Membranprozessen zur Trennung molekularer Gemische pp. 333-347 1978 Chemie-Technik, 7 Jahrgang.
Dr. W. Pusch Synthetische Membranen--Herstellung, Struktur und Arwendung pp. 670-695 1982 Angew. Chem. 94.

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