GB191021201A - Manufacture and Production of New Azodyestuffs. - Google Patents

Abstract

21,201. Newton, P. A., [Farbenfabriken vorm. F. Bayer & Co.]. Sept. 12. [Addition to 19,545/10.] Azo dyes.-Monoazo and primary disazo dyes are obtained by combining the diazo compounds of aminophenyl-1:2-naphthiminazole-5-oxy-7-sulphonic acids, aminophenyl-1:2-naphthoxazole-5- oxy-7-sulphonic acids, or aminophenyl-1: 2-naphthothiazole-5-oxy-7-sulphonic acids, with 5:5'- dioxy-2 : 2<1>-dinaphthylamine-7 : 7<1>-disulphonic acid or the symmetrical urea of 2-amino-5- naphthol-7-sulphonic acid; in the production of primary disazo dyes either two molecular proportions of one of the above diazo compounds, or one molecular proportion of each of two of the above diazo compounds, may be used. The following components are specified:-m- and paminophenyl-1:2-naphthiminazole-5-oxy-7-sulphonic acid, m- and p-aminophenyl-1:2-naphthoxazole-5-oxy-7-sulphonic acid, m-aminophenyl- 1:2-naphthothiazole-5-oxy-7-sulphonic acid. The products dye cotton blue-red, yellowish-red, or red shades, and can be developed on the fibre by diazotized p - nitraniline; reddish - violet, red, blue-red, and bordeaux shades are thus obtained. Specifications 27,843/04, 1675/05, and 11,759/05 are referred to. The Provisional Specification also describes the production of azo dyes from aminonaphthol derivatives substituted in the amino group by a substituent containing a diazotizable amino group, such as aminoaryloxynaphthiminazole sulphonic acids, aminoaryloxynaphoxazole sulphonic acids, aminoaryloxynaphthothiazole sulphonic acids or aminoaryloxynaphthotriazole sulphonic acids, by diazotizing and combining the diazo compounds, either directly or after combination with suitable amines and rediazotation, with the symmetrical ureas or thioureas obtained from 2:5:7- or 2:8:6-aminonaphthol sulphonic acid or with 2:2<1>-dinaphthylamine-5 : 5<1>-dioxy-7 : 7<1>-disulphonic acid or 2:2<1>-dinaphthytamine-8:8<1>-dioxy- 6:6'-disulphonic acid; other diazo or diazoazo compounds may be substituted for one component in the above process. The following combinations are specified: -A monoazo dye from m-aminophenyl-1:2-naphthiminazole-5-oxy- 7-sulphonic acid and 2:2<1>-dinaphthylurea-8:8<1>- dioxy-6:6<1>-disulphonic acid; a trisazo dye from m-aminophenyl-1:2-naphthiminazole-5-oxy-7- sulphonic acid, aminoazobenzene sulphonic acid, and 2:2<1>-dinaphthylurea-5:5<1>-dioxy-7:7<1>-disulphonic acid; a secondary disazo dye from maminophenyl-1:2-naphthothiazole-5-oxy-7-sulphonic acid, cresidine, and 2:2<1>-dinaphthylamine-5:5<1>-dioxy-7:7<1>-disulphonic acid. These products when dyed on cotton can be developed with diazotized p-nitraniline.