C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
260/195
C09B 47/24 (2006.01) C09B 47/26 (2006.01) C09B 62/517 (2006.01)
Patent
CA 1141756
HOE 78/F 107 K PROCESS FOR THE PREPARATION OF WATER-SOLUBLE PHTHALOCYANINE DYESTUFFS Abstract of the disclosure: A process for the preparation of water-soluble phtha- locyanine dyestuffs containing a fiber-reactive group of the vinylsulfone series, by reacting phthalocyanine sulfo- chlorides optionally containing sulfo groups with a pri- mary 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, where- in according to the invention a pyridine-sulfonic acid or a pyridine-carboxylic acid is used as catalyst instead of the pyridine having been common so far. The use of pyri- dine-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 dye- stuffs - avoids the considerable drawbacks occurring in the processes on an industrial scale, which drawbacks are caus- ed by the toxic properties and the unpleasant smell of the pyridine.
328931
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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