ES400377A1 - Procedure for the preparation of insoluble diazoic colorants in water. (Machine-translation by Google Translate, not legally binding)
- Google Patents
Procedure for the preparation of insoluble diazoic colorants in water. (Machine-translation by Google Translate, not legally binding)
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Novartis AG
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Ciba Geigy AG
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Publication date
Priority claimed from CH319271Aexternal-prioritypatent/CH547844A/en
Application filed by Ciba Geigy AGfiledCriticalCiba Geigy AG
Publication of ES400377A1publicationCriticalpatent/ES400377A1/en
Organic Low-Molecular-Weight Compounds And Preparation Thereof
(AREA)
Abstract
Procedure for the preparation of disazo dyes, insoluble in water, devoid of acidic hydrosolubilizing groups and corresponding to the formula **(See formula)** in which A and B are aromatic radicals, of which B carries a nitro group, preferably in the meta position with respect to the azo bridge that unites with A, and R1 and R2 are hydrogen atoms or possibly substituted hydrocarbon radicals, characterized by diazolating an aminoazo compound of the formula A-N = N-B-NH2 in which A and B signify aromatic radicals, of which B carries a nitro group in the meta position with respect to the azo group, and, possibly coupled with barbituric acid, optionally N-substituted. (Machine-translation by Google Translate, not legally binding)
ES400377A1971-03-041972-03-03Procedure for the preparation of insoluble diazoic colorants in water. (Machine-translation by Google Translate, not legally binding)
ExpiredES400377A1
(en)