Process for the preparation of concentrated dyestuff solutions

Details Process for the preparation of concentrated dyestuff solutions Process for the preparation of concentrated dyestuff solutions

1975-10-28

1979-07-31

Warren, Charles F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260157, 260163, 260174, 260175, 260177, 260178, 260179, 260180, 260181, 260183, 260184, 260197, 260198, 260199, 260208, C09B 3516, C09B 4100

Patent

active

041630122

ABSTRACT:
The invention relates to the preparation of concentrated solutions of azo dyestuffs containing ionic groups, by precipitating during the diazotization and/or coupling reaction and/or after the coupling reaction the foreign ions which lower the solubility of the dyestuffs and separating off these ions as sparingly soluble salts.
In this way dyestuff solutions which are stable to storage at room temperature and have a dyestuff content of 10 to 50 percent by weight are obtained.

REFERENCES:
patent: 2424066 (1947-07-01), Straub et al.
patent: 2793205 (1957-05-01), Riat
patent: 2885391 (1959-05-01), Huss et al.
patent: 3956271 (1976-05-01), Blass et al.
patent: 4035350 (1977-07-01), Landler et al.
Fierz-David et al., Fundamental Processes of Dye Chemistry, Interscience Publishers, Inc.: New York, 1949, pp. 31-32 & 80-85.
Durrant et al., Introduction to Advanced Inorganic Chemistry, John Wiley & Sons, Inc.: New York, 2nd Ed., 1970, p. 650.

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