Patent GB-895674-A (GB)
Title: Process for the improvement of the fastness properties of substantive dyeings
IPC: D06P1/655
Filed: 1958-06-18
Abstract: Polysulphonium compounds, used as after-treating agents in substantive dyeing (see Group IV(c)), are prepared by reacting aliphatic polythio ethers having molecular weights between 300 and 30,000 and containing hydroxyl groups, if at all, only as end groups, with agents capable of transforming a thioether group into a sulphonium group, the reaction being effected in a weakly alkaline medium, preferably at 80 DEG  to 90 DEG  C.  Suitable polythio ethers are condensation products of o , o 1-dihydroxy-dialkyl sulphides with d- or poly-hydric alcohols (as described in Specifications 818,359, 819,384 and 823,352), and of dimercaptans with dihalo compounds, e.g. dibromethane, or similarly reacting compound, e.g. glycol dibenzene sulphonic acid esters, and polymers and copolymers of alkylene sulphides.  They may be linear or branched and may be modified, e.g. by reaction with diisocyanates.  Agents which transform the thioether groups include dimethyl and diethyl sulphates; methyl, ethyl, allyl, stearyl, benzyl, menaphthyl and b -diethylaminoethyl chlorides; toluene sulphonic acid methyl ester, chloroacetic acid, glycol chlorhydrin, epichlorhydrin, b , b 1-dichloro-diethyl ether, chloracetone, monochloromethyl phenyl ketone and butane sultone. Specification 274,130 also is referred to.ALSO:Polysulphonium compounds, used as after-treating agents in substantive dyeings (see Group IV(c)), are prepared by reacting aliphatic polythio ethers having molecular weights between 300 and 30,000 and containing hydroxyl groups, if at all, only as end groups, with agents capable of transforming a thioether group into a sulphonium group, the reaction being effected in a weakly alkaline medium, preferably at 80 DEG C-90 DEG C.  Suitable polythio ethers are condensation products of o ,o 1-dihydroxy-dialkyl sulphides with di- or poly-hydric alcohols (as described in Specifications 818,359, 819,384 and 823,352), and of dimercaptans with dihalo compounds, e.g. dibromoethane, or similarly reacting compound, e.g. glycol-dibenzene sulphonic acid esters, and polymers and copolymers of alkylene sulphides.  They may be linear or branched and may be modified, e.g. by reaction with diisocyanates.  Agents which transform the thioether groups include dimethyl and diethyl sulphates; methyl, ethyl, allyl, stearyl, benzyl, menaphthyl and b -diethylaminoethyl chlorides; toluene sulphonic acid methyl ester, chloroacetic acid, glycol chlorhydrin, epichlorhydrin, b ,b 1-dichlorodiethyl ether, chloroacetone, monochloromethyl phenyl ketone and butane sultone. Specification 274,130 also is referred to.ALSO:The fastness of substantive dyeings is improved by after-treating with a polysulphonium compound obtained by reacting an aliphatic polythio ether having a molecular weight of 300 to 30,000 and containing hydroxyl groups, if at all, only as end groups, with agents capable of transforming a thioether group into a sulphonium group (see Group IV(a)).  In the examples, cotton fabric dyed according to Example 1 of Specification 274,130, is treated with: (1) a solution prepared by reacting dimethyl sulphate with a polythioether (prepared as described in Specification 823,352) is aqueous sodium carbonate solution; and (2) a solution prepared by reacting dimethyl sulphate with a condensation product of thiodiglycol and trimethylol propane in aqueous sodium carbonate solution.  Specifications 818,359 and 819,384 also are referred to.