Azo dyes

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C - Chemistry, Metallurgy

09

B

8/21, 260/166.6

C09B 45/16 (2006.01) D06P 1/10 (2006.01)

Patent

CA 1050014

Abstract of the Disclosure The present invention provides asymmetric 1:2 chromium complex compounds of formula I, Image I in which R1 signifies a hydrogen or halogen atom or a nitro group, R2 signifies a hydrogen or halogen atom, a nitro or sulpho group, R3 signifies a hydrogen or halogen atom, or a lower alkyl radical, R4 signifies a hydrogen or halogen atom, a lower alkyl radical or a sulpho group, each of R5, R6 and R7, independently, signifies a hydrogen or halogen atom or a lower alkyl radical, R signifies a hydrogen atom or a lower alkyl radical, and M signifies a cation, with the provisos (i) the radicals R1 and R2 occupy the 4- and 6- positions, (ii) where R4 signifies a sulpho group one of the radicals R1 and R2 signifies a halogen atom or a nitro group in the 4-position, and (iii)the compounds contain a single sulpho group which is in free acid or salt form, which compounds are useful as dyes.

220917

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