GB190928718A - Manufacture and Production of New Polyazodyes. - Google Patents

Abstract

28,718. Newton, P. A., [Farbenfabriken vorm. F. Bayer & Co.]. Dec. 8. Samples furnished. Trisazo and tetrakisazo dyes are obtained by diazotizing those secondary disazo dyes described in Specification 4768/09 that contain as end component aminobenzoyl - 2 amino - 5 - naphthol-7-sulphonic or -1 :7-disulphonic acid, or derivatives thereof substituted in the benzene residue, or the corresponding derivatives of 2-amino 5-naphthol- 3:7-disulphonic acid, and combining the diazo compounds so obtained with azo dye components and in the case when this component is a suitable amine, rediazotizing and combining with components, or by diazotizing the above-mentioned aminobenzoylaminonaphthol sulphonic acids &c., combining them with components to produce monoazo or secondary disazo dyes, and reacting upon the resulting products with diazotized aminoazo compounds. According to examples :- the diazo compound of p-aminoazobenzene-4- sulphonic acid is combined with 4-aminobenzoyl-2- amino-5-naphthol-7-sulphonic acid, the product is rediazotized and combined with salicylic acid ; the diazo compound of 3-aminobenzoyl-2-amino-5- naphthol-1 :7-disulphonic acid is combined with m-toluidine, and the product is combined with the diazo compound of the aminoazo body prepared from diazotized p-chloraniline-o-sulphonic acid and m-toluidine ; this trisazo dye on diazotization on the fibre and development with #-naphthol gives a claret-red ; the secondary disazo dye obtained from 4-aminobenzoyl - 2 - amino - 5 - naphthol-1 : 7-disulphonic acid, p-xylidine, and 2-benzoylamino-5- naphthol-1 : 7-disulphonic acid, is combined with the diazo compound of the aminoazo body prepared from diazotized 1 : 3-dimethyl-4-aminobenzene-5- sulphonic acid and p-xylidine ; the same dye is also prepared by the first process above described. The following components are also specified :- 4-aminobenzoyl - 2 - amino - 5 - naphthol-3 : 7-disulphonic acid, 3-aminobenzoyl-2-aminu-5-naphthol-7- sulphonic or 3 : 7 disulphonic acid, 3-amino-4- methoxybenzoyl - 2 - amino-5-naphthol-7-sulphonic acid, 3-amino-4-chlorbenzoyl-2-amino-5-naphthol-7- sulphonic acid ; aniline, 1-naphtbylamine-6-sulphonic acid ; phenol, acetoacetic ester, 1-naphthol- 3-sulphonic acid, 2-acetylamino-5-naphthol-7-sulphonic acid, 2-benzoylamino-5-naphthol-7-sulphonic acid. Specification 1581/04 is referred to. Nitrobenzoyl-2-amino-5-naphthol-3 : 7 disulphonic acids are obtained by condensing 2-amino-5- naphthol-3 : 7-disulphonic acid with nitrobenzoyl chlorides. Aminobenzoyl-2-amino-5-naphthol-3 : 7-disulphonic acids are obtained by reducing the above nitro compounds.