Patent GB-242711-A (GB)
Title: Improvements in the dyeing, printing or stencilling of acetyl cellulose or products made therewith
Filed: 1924-08-14
Abstract: Insoluble or relatively insoluble dyestuffs are solubilized by treatment with the agents of Specification 214,349 in conjunction with the following secondary or auxiliary solvents, namely (1) alkyl or alkylene halides, such as tetrachlorethane or trichlorethylene, (2) simple or mixed cyclic or aromatic derivatives containing one or more chlorine atoms or amino, or hydroxyl groups, such as cresols, alkylanilines, toluidines, chlorphenols, or mono or polychlorbenzenes, and (3) hydrogenated derivatives of such or other aromatic compounds, for example hexahydrophenol, hexahydrocresols, hexahydrobenzene, decahydronaphthalene, tetrahydronaphthalene or the like. Suitable dyestuffs are those specified in Specifications 219,349, 224,681, 227,183, and 237,943.  The dyestuff may be treated with one or more solubilizing agents and one or more of the auxiliary solvents in any order and in presence or absence of water.  The Specification contains examples of the use of dimethylaniline, hexahydrophenol, and tetrachlorethane in conjunction with sodium sulphoricinoleate.  Reference has been directed by the Comptroller to Specification 224,925.ALSO:Insoluble or relatively insoluble dyestuffs are solubilized for the dyeing of cellulose acetate by pretreatment with the solubilizing agents of Specification 219,349 in conjunction with the following secondary or auxiliary solvents, namely alkyl or alkylene halides, such as tetrachlorethane or trichlorethylene, simple or mixed cyclic or aromatic derivatives containing one or more amino, chlor or hydroxy groups, such as cresols, alkylanilines, toluidines, chlorphenols or mono or polychlorbenzenes, and hydrogenated derivatives of such or other aromatic compounds, for example, hexahydrophenol, hexahydrocresols, hexahydrobenzene, decahydronaphthalene, tetrahydronaphthalene or the like.  Suitable dyestuffs are those specified in Specifications 219,349, 224,681, 227,183, and 237,943.  The dyestuff may be treated with one or more solubilizing agents and one or more of the auxiliary solvents in any order and in presence or absence of water, and the Specification contains examples of the use of dimethylaniline, hexahydrophenol and tetrachlorethane in conjunction with sodium sulphoricinoleate.  Reference has been directed by the Comptroller to Specification 224,925.ALSO:In the dyeing, printting, or stencilling of yarns, fabrics or other products of cellulose acetate or of mixed goods containing it by means of insoluble or relatively insoluble colouring matters or organic compounds (for the production of dyes on the material) there are employed in conjunction with the solubilizing agents specified in Specification 219,349 the following secondary or auxiliary solvents, namely alkyl or alkylene halides, such as tetrachlorethane or trichlorethylene, simple or mixed cyclic or aromatic derivatives containing one or more amino, chlor or hydroxy groups, such as cresols, alkylanilines, toluidines, chlorphenols or mono- or polychlorbenzenes, and hydrogenated derivatives of such or other aromatic compounds, for example hexahydrophenol, hexahydrocresols, hexahydrobenzene, decahydronaphthalene, tetrahydronaphthalene or the like, with resultant economy both in the amount of solubilizing agent and of dyestuff necessary.  Suitable dyestuffs or compounds are those specified in Specifications 219,349, 224,681, 227,183 and 237,943. The dyestuff or compound may be treated with one or more solubilizing agents and one or more of the auxiliary solvents in any order in presence or absence of water.  In examples o-toluene-azo-o-toluene-azo-b -naphthol is pasted and heated with dimethylaniline and then with sodium sulphoricinoleate, the resulting mass giving a dye-bath yielding red shades on acetyl silk yarn; 2 : 4-dinitro-41-aminodiphenylamine is ground and heated with sodium sulphorincinoleate and then with hexahydrophenol, the dye-bath prepared therefrom giving old gold shades on acetyl cellulose yarn; 3-(5 : 7-dibromindole)-21-thionaphthenindigo is pasted and heated with tetrachlorethane and subsequently with sodium sulphoricinoleate to give a dye-bath yielding rose shades on yarn or fabric; 4-p-tolylamino-1-anthra-N-methylpyridone is dissolved in tetrachlorethane and the solution heated with sodium sulphoricinoleate for the production of a bath giving violet-red shades on yarn.  A dyestuff containing free amino groups may be thus applied to the material and then diazotized and developed, or azo dyes may be produced on the material by applying either the base or the developer in solubilized form, but in these cases the auxiliary solvent must not act as a component.  Other dyestuffs may be applied before after or if they are not deleteriously affected together with the solubilized colours, particularly for mixed goods.  The following dyestuffs are also specified:-2 : 4-dinitrobenzene-azo-diethylaniline, p-nitrobenzone-azo-b -naphthol, di-p-tolyl-1 : 4-diaminoanthraquinone, 2 : 4-dinitro-31-hydroxydiphenylamine, di-p-methoxybenzoyldiaminoanthrarufin and 4 : 41-dimethoxy-2 : 6-di-a -anthraquinonyl-diaminoanthraquinone.  Reference has been directed by the Comptroller to Specification 224,925.