5-mercapto-2-nitro paraphenylenediamine compounds and hair...

Details 5-mercapto-2-nitro paraphenylenediamine compounds and hair... 5-mercapto-2-nitro paraphenylenediamine compounds and hair...

C - Chemistry, Metallurgy

09

B

C09B 57/00 (2006.01) C07C 323/36 (2006.01) A61K 7/13 (1995.01)

Patent

CA 2148535

Direct dyes are disclosed, which have the structure: Image ( I) wherein R, R1, R2 and R3 are the same or different and are hydrogen, C1 to C4 alkyl or C1 to C4 hydroxyalkyl having from 1 to 2 hydroxy groups, with the proviso that R is not hydrogen.

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