Patent GB-434416-A (GB)
Title: Manufacture of ortho-disazo-dyestuffs, insoluble in water
IPC: C09B31/02
Filed: 1934-02-02
Abstract: Disazo dyes, insoluble in water, are made in substance, on a substratum or on the fibre by diazotizing a substitution product of 2-amino-1 : 1<1>-azobenzene and coupling with an arylide of 2 : 3-hydroxynaphthoic acid, only such components being used as do not contain groups lending solubility.  They are faster to boiling caustic soda solution the corresponding dyes from diazotized p-aminoazo compounds (c.f. Specification 379,555).  In examples the following dyes are made on cotton: (1) 4-methyl-2-amino-2<1> : 4<1>-dichloroazobenzene --> 1-(2<1> : 3<1>-oxynaphthoylamino)-2-methyl-4-chlorobenzene (bordeaux-red); (2) 5 - methyl - 4 - methoxy - 2 amino - 2<1> : 4<1>-dichloroazobenzene --> the anilide (red-brown). Samples have been furnished under Sect. 2 (5) of dyestuffs from the following components: 5 - methyl - 4 - methoxy - 2 - amino - 2<1> - chloro - or 2<1> : 6<1> - dichloro - or 2<1> - methy or 2<1> - methoxy 4<1> - nitroazobenzene, 5 - methyl-4 - methoxy - 2 - amino - 2<1> : 4<1> - dinitroazobenzene, 5 - chloro - 4 - methoxy - 2 - amino-2<1> - chloro - 4<1> - nitroazobenzene, 4 : 5 - dimethoxy - 2 - amino - 2<1> - chloro - 4<1>-nitroazobenzene, 5 - methyl - 4 - ethoxy - 2 - amino - 2<1> - chloro-4<1> - nitroazobenzene, 5 - methyl - 4 - methoxy-2 - amino - 2<1> - nitro - 4<1> - trifluoromethylazobenzene; the o-toluidide, p- and o-anisidide, 2- or 3-methyl - 4 - anisidide and m-nitranilide. Specification 417,497 also is referred to.  The Specification as open to inspection under Sect. 91 specifies further dyestuffs among which the following additional components are specified: 5-methyl-4-methoxy-2-amino - 4<1> - chloro- or 2<1> - or 4<1> - methoxyazobenzene, 5 - methyl - 4 - methoxy - 2 - amino - 2<1> : 4<1> -dimethylazobenzene, 5 - methyl-4 - methoxy - 2 - amino - 3<1> - nitro - 4<1> - methoxyazobenzene, 5 - methyl - 4 - methoxy - 2 - amino - 2<1> - methoxy - 5<1> - nitroazobenzene, 5 - methyl - 4 - methoxy - 2 - amino - 4<1> - nitroazobenzene, 5 - methyl - 4 - methoxy - 2 - amino - 2<1> : 5<1> - dimethoxy- or 3<1>-methyl-4<1>-nitroazobenzene, 4 : 5 - dimethyl - 2 - amino-4<1> - nitroazobenzene, 5 - methyl - 4 - methoxy-2 - amino - 2<1> - nitro - 4<1> - methylazobenzene, 5 - methyl - 4 - methoxy - 2 - amino - 2<1> : 5<1>-dichloroazobenzene, 5 - methyl - 4 - methoxy - 2-amino - 2<1> - nitro - 4<1> - chloro- or 4<1> - methoxyazobenzene, 5 - methyl - 4 - methoxy - 2 - amino-2<1> - methoxy - 5<1> - nitroazobenzene, 5 - methyl-4 - methoxy - 2 - amino - 4<1> - chloro - 5<1>-methyl-2<1> - sulphodimethylamide - azobenzene, 5-methyl - 4 - methoxy - 2 - amino - 2<1> - methylsulphonyl - 5<1> - trifluoromethylazobenzene, 5 - nitro - 4 - methoxy - 2 - amino - 2<1> - nitroor 2<1> - chloro-azobenzene, 5 - methyl - 4 - methoxy - 2 - amino - 2<1> - ethoxy - 4<1> - nitro - 5<1>-methylazobenzene, 5- methyl - 4 - methoxy-2 amino - 2<1> : 4<1> - dibromo- or 4<1> - phenoxy- or 4<1> - N - methylethanesulphamide or 2<1>-carboxylic acid methylester-azobenzene, 4 : 5-dimethyl-2 - amino - 2<1> - chloro - 4<1> - nitroazobenzene, 5 - methyl - 4 - methoxy - 2 - amino - 2<1> - phenylsulphonyl - 4<1> - nitroazobenzene; the p-chloranilide, a - or b -naphthylamide, p-toluidide, 2 : 5-dimethoxyanilide and 5-chlor-2-toluidide of 2 : 3-oxynaphthoic acid.  This subject matter does not appear in the Specification as accepted.