Organic compounds -- part of the class 532-570 series – Organic compounds – Azo
Patent
1988-04-14
1990-05-08
Higel, Floyd D.
Organic compounds -- part of the class 532-570 series
Organic compounds
Azo
534573, 534676, 534576, 534887, 534579, 534575, C09B 29085, C09B 3700, C09B 6710, C09B 6734
Patent
active
049239724
ABSTRACT:
Liquid formulations of basic azo dyes are prepared from unsubstituted or C.sub.1 -C.sub.4 -alkyl- or C.sub.1 -C.sub.4 -alkoxy-substituted m-phenylenediamine by diazotizing and coupling in carboxylic acid solution, which comprises performing the reaction with 0.76 to 0.95 mole of nitrile, calculated as nitrous acid and based on 1 mole of m-phenylenediamine, and then heating the resulting reaction mixture at from 60.degree. C. to the boiling point of the reaction mixture.
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patent: 4400321 (1983-08-01), Linhart et al.
BASF - Aktiengesellschaft
Higel Floyd D.
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