Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Novartis AG
Original Assignee
Ciba Geigy AG
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Filing date
Publication date
Priority claimed from CH55071Aexternal-prioritypatent/CH572962A5/xx
Application filed by Ciba Geigy AGfiledCriticalCiba Geigy AG
Publication of ES399158A1publicationCriticalpatent/ES399158A1/en
Process for the preparation of azo dyes, which as a radical of the coupling component contain the radical of a dihydroxypyridine, in which a substituent is additionally bound ortho to the azo bridge, which contains at least one heteroatom, where the substituent should not being a halogen atom, characterized in that an azo dye, which, as a radical of the coupling component, contains the radical of a dihydroxypyridine, wherein a halogen atom is bound ortho to the azo bridge, is reacted with substitution compounds, which contain a corresponding radical. (Machine-translation by Google Translate, not legally binding)
ES399158A1971-01-141972-01-13Procedure for the preparation of azoic colors (Machine-translation by Google Translate, not legally binding)
ExpiredES399158A1
(en)
Procedure for the preparation of a photographic chromatic image with the help of color copulators (Machine-translation by Google Translate, not legally binding)
Procedure for the preparation of insoluble bisazous colors in water and the colorants obtained by this process (Machine-translation by Google Translate, not legally binding)