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Novartis AG
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Ciba Geigy AG
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Publication date
Application filed by Ciba Geigy AGfiledCriticalCiba Geigy AG
Publication of ES227724A1publicationCriticalpatent/ES227724A1/en
Process for the preparation of new disazo dyes, characterized in that pyrazole compounds of formula are coupled bilaterally ** (See formula) ** wherein X means a bridging link free of sulfonic acid groups and carboxylic acid groups, with diazo compounds of amines of formula ** (See formula) ** wherein, R means a benzene radical free of sulphonic acid groups and carboxylic acid groups, or by linking, in the amino groups, two molecules of a monoazo-dye of formula ** (See formula) ** in which R has the indicated significance, by means of a bridging link free of sulphonic acid groups and carboxylic acid groups, and by means of which said nickel or copper is optionally reacted with such dyes. (Machine-translation by Google Translate, not legally binding)
ES0227724A1955-03-251956-03-24Procedure for the preparation of new disazocolorants. (Machine-translation by Google Translate, not legally binding)
ExpiredES227724A1
(en)