| 摘要 |
A process for the preparation of an azo dye of formula <IMAGE> (1) wherein K is the beta -naphthol radical, X is hydrogen or nitro and M is an alkali metal ion or an ammonium ion, which process comprises coupling an aqueous solution containing 15 to 30 percent by weight of a diazo component of formula <IMAGE> (2) and 6 to 20 mol % of an ammonium salt, based on the molar amount of the diazo component, at a pH in the range from 10.5 to 11.5 and in an inert gas atmosphere, to a coupling component of formula <IMAGE> (3) in which formulae (2) and (3) above K and X are as defined for formula (1). The present invention makes it possible to obtain the claimed azo dyes in high yield.
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