GB224925A - Improvements in or relating to the dyeing or coloring of products made with cellulose acetate - Google Patents

Abstract

Insoluble or difficulty-soluble dyes or amino bases of the types described in Specification 219,349, for dyeing cellulose acetate goods are dispersed by means of carbocyclic compounds containing salt-forming groups, or salts of these bodies, or mixtures thereof with the dispersing-agents described in the above-mentioned Specification. Suitable carbocyclic compounds are naphthenic acids, naphthene sulphonic acids, or other carboxylic or sulphonic acids of the cycloparaffins, phenol, sulphonic, or carboxylic acids, phenol sulphonic acids, or other derivatives of the benzene, naphthalene, or anthracene series. According to examples:-m-Nitrobenzene-azo-diphenylamine is heated and stirred with naphthenic acid, water or soap solution is added, and the mixture made slightly alkaline with caustic soda and boiled; 1-methyl-amino-4-p-tolylaminoanthraquinone is dispersed similarly with naphthenic acid and soap solution; benzene-azo-benzene-azo-b -naphthol is heated and stirred with p-cresol and sodium sulphoricinoleate and diluted with sodium oleate solution; p-methoxybenzene-azo-b -naphthol is heated and stirred with 1-naphthol-4-sulphonic acid sodium sulphoricinoleate and diluted with sodium oleate solution containing caustic soda.ALSO:Insoluble or difficultly-soluble dyes or amino bases of the types described in Specification 219,349, for dyeing cellulose acetate goods are dispersed by means of carbocyclic compounds containing salt-forming groups, or salts of these bodies, or mixtures thereof with the dispersing-agents described in the above-mentioned Specification. Suitable carbocyclic compounds are naphthenic acids, naphthene sulphonic acids, or other carboxylic or sulphonic acids of the cycloparaffins, phenols, sulphonic or carboxylic acids, phenol sulphonic acids, or other derivatives of the benzene, naphthalene, or anthracene series. According to examples:-m-nitrobenzene-azo-diphenylamine is heated and stirred with naphthenic acid, water or soap solution is added, and the mixture made slightly alkaline with caustic soda and boiled; the resulting solution dyes cellulose acetate yellow; a similar dispersion of 1-methylamino-4-p-tolylaminoanthraquinone with naphthenic acid and soap solution gives a sky-blue shade; a red shade is obtained with the solution prepared by heating and stirring benzene-azo-benzene-azo-b -naphthol with p-cresol and sodium sulphoricinoleate and diluting with sodium oleate solution; an orange shade is obtained with the solution prepared by heating and stirring p-methoxybenzene-azo-b -naphthol with 1-naphthol-4-sulphonic acid and sodium sulphoricinoleate and diluting with sodium oleate solution containing caustic soda.ALSO:The dyeing or colouring of cellulose acetate goods (yarns, threads, filaments, fabrics, films, &c.) is effected by means of insoluble or difficultly-soluble dyes which have been stabilized by pretreatment with carbocyclic compounds containing salt-forming groups, or salts of these bodies, or mixtures thereof with the solubilizing-agents described in Specification 219,349. The procedure is similar to that of the above-mentioned Specification, and may be applied to the types of dyes mentioned therein for dyeing, printing, or stencilling the goods, to amino bases used in forming azo dyes on the material, for dyeing mixed goods containing cellulose acetate in uniform or contrasting shades, &c. Suitable carbocyclic compounds are naphthenic acids, naphthene sulphonic acids, or other carboxylic or sulphonic acids of the cyclo paraffins, phenols, sulphonic or carboxylic acids, phenol sulphonic acids or other derivatives of the benzene, naphthalene, or anthracene series. According to examples: - m-Nitrobenzene-azo-diphenylamine is heated and stirred with naphthenic acid, water or soap solution is added, and the solution made slightly alkaline with caustic soda and boiled; the resulting solution dyes cellulose acetate yellow; a similar dispersion of 1-methylamino-4-p-tolylaminoanthraquinone with naphthenic acid and soap solution gives a sky-blue shade; a red shade is obtained with the solution prepared by heating and stirring benzene-azo-benzene-azo-b -naphthol with p-cresol and sodium sulphoricinoleate and diluting with sodium oleate solution; an orange shade is obtained with the solution prepared by heating and stirring p-methoxybenzene-azo-b -naphthol with 1-naphthol-4-sulphonic acid and sodium sulphoricinoleate and diluting with sodium oleate solution containing caustic soda.