Mixtures and mixed crystals of dyes.

摘要

A dyestuff comprising a mixture of two or more compounds of Formula (1): <CHEM> wherein: R<1> & R<2> are each independently selected from -H, nitro, halogen, C1-6-alkyl, C1-6-alkoxy, phenyl, phenoxy, C1-6-alkoxyphenyl, cyano, -COOR and -SR, hydroxy, OCO.C1-6-alkyl, -SO2OH, -SO2Cl, -SO2C1-6-alkyl, -NR2 and -CONR2, -OC1-6-alkyl-COOR<5>, -OC1-6-alkylOR<5>, -OC1-6-alkylOR<5>OR<5>, and -OC1-6-alkylOCOR<5>, -OC2-6-alkenyl, -OC1-6-alkyl-Z, -OC1-6-alkylOC1-6-alkyl-Z and -OC1-6-alkylSC1-6-alkyl-Z in which Z is a 5-, 6- or 7- membered saturated or unsaturated heterocyclic residue; and R<3>, R<4>, R<5> & R<6> are each independently selected from -H, C1-6-alkyl, halogen and C1-6-alkoxy, in which each R independently is -H, C1-6-alkyl or phenyl and in which each R<5> independently is -H, C1-6-alkyl, -C1-6-alkyl-C1-6-alkoxy or phenyl except where the mixture contains one compound of Formula (1) in which R<2> is -OC2H5 and R<1>, R<3>, R<4>, R<5> and R<6> are all -H, one compound of Formula (1) in which R<2> is n-propoxy and R<1>, R<3>, R<4>, R<5> and R<6> are all -H and 4-[1-cyanomethyl-4,5-dicyano imidaz-2-ylazo] N-ethyl-N-(ethoxycarbonylpropyl)aminobenzene.