Dyestuff preparations and processes for their production

Details Dyestuff preparations and processes for their production Dyestuff preparations and processes for their production

1975-12-23

1978-09-05

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 43, 8 44, 8 542, 8 76, 8 85R, 8 89R, 8178R, C09B 2700

Patent

active

041116496

ABSTRACT:
A process for the manufacture of stable, concentrated solutions of water-soluble tertiary ammonium salts of disazo dyestuffs is described, which comprises diazotizing 2 moles of the same primary aromatic amine or 1 mole each of different primary aromatic amines and reacting the diazo mixture with 1 mole of a compound which is able to couple with diazonium salt in at least 2 positions, in the presence of at least 2 moles of a tertiary amine and optionally other assistants. The resulting solutions prove stable even on prolonged storing at room temperature and are not affected by frost. The solutions are miscible in any ratio with water or, in part, also with suitable water-miscible organic solvents.

REFERENCES:
patent: 3679353 (1972-07-01), Streck
patent: 3681320 (1972-08-01), Franklin et al.
patent: 3684425 (1972-07-01), Ross et al.
patent: 3852029 (1974-12-01), Bolliger et al.
patent: 3898033 (1975-08-01), McLeod
Hackh's Chemical Dictionary, Fourth Edition, (McGraw-Hill, New York), 1972, p. 446.

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