Process for the preparation of water-soluble phthalocyanine dyes

Details Process for the preparation of water-soluble phthalocyanine dyes Process for the preparation of water-soluble phthalocyanine dyes

1979-05-31

1980-12-02

Raymond, Richard

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2602451, 2603145, C09B 4708

Patent

active

042370507

ABSTRACT:
A process for the preparation of water-soluble phthalocyanine dyestuffs containing a fiber-reactive group of the vinylsulfone series, by reacting phthalocyanine sulfochlorides, optionally containing sulfo groups, with a primary or secondary amine which contains a fiber-reactive group of the vinylsulfone series, and optionally with a further primary or secondary amine in common manner, wherein according to the invention a pyridine-sulfonic acid or a pyridine-carboxylic acid is used as catalyst instead of the pyridine, as used previously. The use of pyridine-sulfonic acids or pyridine-carboxylic acids--which results in the same good reaction rate and yield as the use of pyridine in the preparation of phthalocyanine dyestuffs--avoids the considerable drawbacks occurring in the preparation on an industrial scale, which drawbacks are caused by the toxic properties and the unpleasant smell of the pyridine.

REFERENCES:
patent: 3899486 (1975-08-01), Horst

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