Process for the dyeing and printing of hydrophobic synthetic organic fiber materials with water-insoluble azo dyestuffs

A process for the dyeing or printing of a hydrophobic organic fibrous material containing or consisting of a polyester, which comprises

• dyeing said fibrous material from an aqueous dispersion with a dyestuff of the formula ##STR49## in which X is alkyl of from 1 to 4 carbon atoms, phenyl, lower alkyl-phenyl, lower alkoxy-phenyl, nitrophenyl, chlorophenyl or bromophenyl, and D is phenyl, lower alkyl-phenyl, lower alkoxy-phenyl, nitro-phenyl, chloro-phenyl, benzoyl-phenyl, phenyl-phenyl, phenoxy-phenyl, lower alkylsulfonyl-phenyl, aminocarbonyl-phenyl, aminosulfonyl-phenyl, ##STR50## chloro-nitro-phenyl, lower alkyl-nitro-phenyl, lower alkoxy-nitro-phenyl, (di(cyano)-phenyl, trifluoromethyl-nitro-phenyl or hydroxyalkoxy-nitro-phenyl at a pH value of from 2 to 9 and at a temperature above 100.degree. C. under pressure, or at about 100.degree. C. in the presence of a carrier, or
• by impregnating said fibrous material with an aqueous dispersion of a dyestuff of said formula ##STR51## said dispersion having a pH-value of from 2 to 9, and subsequently exposing the impregnated fibrous material to a short heat treatment between about 180.degree. and 210.degree. C., or
• which comprises, in accordance with the transfer printing method, printing an inert carrier material consisting of paper, a foil of a heat resistant resin or aluminum with a printing ink containing as essential ingredients water or an organic solvent, a common binding agent and a dyestuff of said formula ##STR52## in a finely divided state, bringing the printed side of the carrier material in close contact with the fibrous material, exposing said materials to a short heat treatment between 170.degree. and 210.degree. C. while still in contact and separating the fibrous material from the carrier material.