Water-insoluble azo dyestuffs

Novel azo dyestuffs-being water-soluble only in traces - of the formula ##STR121## in which D as the radical of a diazo component represents nitrophenylene, carbo-lower alkoxy-phenylene, dinitrophenylene, nitro-cyano-phenylene, nitro-chloro-phenylene, nitro-bromo-phenylene, nitro-lower alkylsulfonyl-phenylene, nitro-carbo-lower alkoxy-phenylene, di(cyano)phenylene, trifluoro- lower alkylsulfonyl-phenylene, dichlorophenylene, chloro- lower alkoxy-phenylene,

• chloro- lower alkylsulfonyl-phenylene, di(nitro)-bromophenylene, trichlorophenylene, dichloro-nitro-phenylene, dinitro-chloro-phenylene, phenylazo-phenylene, di(carbo-lower alkoxy)phenylene,
• nitro- lower alkyl-phenylene, nitro-trifluoromethyl-phenylene or nitro-bromo-cyano-phenylene,
• K represents phenylene, lower alkylphenylene, lower alkoxyphenylene, chlorophenylene acetylamino-phenylene, benzoylamino-phenylene, lower alkylsulfonylamino-phenylene, formylamino-phenylene, chloroacetylamino-phenylene, carbo-lower alkoxyamino-phenylene, lower alkyl- lower alkoxyphenylene, lower alkyl-acetylamino-phenylene, di(lower alkyl)phenylene, dichlorophenylene, lower alkoxy-lower alkylene-CO-NH-phenylene, lower alkoxy-acetylamino-phenylene or hydroxynaphthylene,
• R represents hydrogen, lower alkyl, lower alkylene-O-CO-lower alkyl, lower alkylene-COO-lower alkyl, cyano-lower alkyl, chloro-lower alkyl, benzyl or cyclohexyl,
• R.sub.1, represents hydrogen, alkyl of from 3 to about 14 carbon atoms, cyanoethyl, hydroxyethyl, acetoxyethyl or benzyl, and R.sub.2 represents alkyl of from 4 to about 14 carbon atoms, benzyl, phenylethyl, cyclohexyl, phenyl, methylphenyl, ethylphenyl, methoxyphenyl, ethoxyphenyl, nitrophenyl, chlorophenyl or bromophenyl.