GB409451A - Improvements in colouring rubber - Google Patents

Abstract

Rubber is coloured by the addition to the mix of compounds of the general formula <FORM:0409451/IV/1> in which X represents hydrogen, halogen, alkyl, alkoxyl or aralkyl, and R represents the radicle of a hydroxynaphthoic acid amide. The dyestuffs are free from nitro, sulpho, and further p carboxylic acid groups and from metals. Compounds mentioned are:--tetrazotized benzidine, tolidine, dianisidine or 3 : 3<1> dichlorbenzidine coupled with 2 mols. of 2 : 3 hydroxynaphthoic acid anilide, together with tetrazotizeddianisidine coupled with two mols. of 2 : 3 hydroxynaphthoic acid - p - chloranilide, or 2 : 3 - hydroxynaphthoic acid - m - chloranilide, or 2 : 3 - hydroxynaphthoic acid 5 - chlor - 2 - toluidide, or 2 : 3 - hydroxynaphthoic acid - m - anisidide, or 2 : 3 hydroxynaphthoic acid 2 : 4 - dimethoxy - 5 - chloranilide or 2 : 3 hydroxynaphthoic acid amide, and tetrazotized 3 : 3<1> dichlorbenzidine coupled with two mols. of 2 : 3 - hydroxynaphthoic acid amide, or 2 : 3 - hydroxynaphthoic acid - o - anisidide. Further compounds mentioned as coupling components are the 2 : 6 - hydroxynaphthoic acid arylides, and the compounds obtained by condensing ortho meta or paranitrobenzoic acid or a halide thereof with aniline or a nuclear alkoxyl, alkyl or halogen substituted aniline, reducing the nitro group in the resulting product and condensing the amino aroylamino compound with 2 : 3 hydroxy - naphthoic acid. Other coupling components which may be used are those referred to in Specification 374,548.ALSO:Rubber is coloured by the addition to the mix of compounds of the general formula <FORM:0409451/V/1> in which X represents hydrogen, halogen, alkyl, alkoxyl or aralkyl, and R represents the radicle of a hydroxynaphthoic acid amide. The dyestuffs are free from nitro, sulpho, and further carboxylic acid groups, and from metals. Compounds mentioned are: tetrazotized benzidine tolidine, dianisidine, or 3.31-dichlorbenzidine coupled with 2 mols. of 2 : 3 hydroxynaphthoic-acid-anilide, together with tetrazotized dianisidine coupled with two mols. of 2 : 3 hydroxynaphthoic acid-p-chloranilide, or 2 : 3-hydroxynaphthoic acid m-chloranilide, or 2 : 3-hydroxynaphthoic acid 5-chlor-2-toluidide, or 2 : 3 hydroxynaphthoic acid-m-anisidide, or 2 : 3 hydroxynaphthoic acid-2 : 4-dimethoxy-5-chloranilide, or 2 : 3-hydroxynaphthoic acid amide, and tetrazotized 3 : 31 dichlorbenzidine coupled with two mols. of 2 : 3 hydroxynaphthoic acid amide, or 2 : 3-hydroxynaphthoic acid-o-anisidide Further compounds mentioned as coupling components are the 2 : 6 hydroxynaphthoic acid arylides, and the compounds obtained by condensing ortho, meta or paranitrobenzoic acid or a halide thereof with aniline, or a nuclear alkoxyl-alkyl or halogen substituted aniline reducing the nitro group in the resulting product and condensing the amine aroylamino compound with 2 : 3 hydroxynaphthoic acid. Other coupling components which may be used are those referred to in Specification 374,548, [Group IV].