Patent GB-446265-A (GB)
Title: Improvements in printing with vat-dyestuffs
Filed: 1934-09-22
Abstract: Printing; dye preparations.--A sulphobetaine is incorporated in a vat dye printing (direct, discharge or resist) preparation, either by adding it directly to the usual printing paste containing the vat dye or its leuco compound or by making up the paste with a marketable admixture, preferably in powder form, of the sulphobetaine with the vat dye and, if desired, a dispersing agent.  The resulting prints show improved speed of fixation and improved levelling and penetration of the dyestuffs.  The following examples are specified: (1) a homogeneous mixture of finely dispersed tetrabromindigo, dextrin and pyridinium - hydroxypropane - sulphobetaine is stirred into an aqueous paste containing wheat starch-tragacanth thickening, glycerol, potassium carbonate and sodium formaldehydesulphoxylate, the mixture is printed on cotton or viscose artificial silk and the printed material is dried at 60--70 DEG  C., steamed for 3--5 minutes, oxidized, e.g. in a bath containing potassium bichromate and acetic acid, washed, soaped, washed and dried to obtain intense pure blue level prints.  (2) Pyridinium-hydroxypropane-sulphobetaine is added to a printing preparation containing the dyestuff of Example 3 of Specification 231,532, [Class 2 (iii)], and the mixture is printed on cotton or viscose and/or cuprammonium artificial silk.  (3) Pyridiniumethane-sulphobetaine is added to a printing preparation containing the dyestuff obtained by melting a halogenbenzanthrone with alcoholic potash and chlorinating the product in nitrobenzene (cf. Specification 7931/09, [Class 2 (iii)]), and the mixture is printed as in (2).  (4) Pyridinium - hydroxypropane - sulphobetaine is added to a printing preparation containing the dyestuff obtainable by melting benzanthrone or the product from anthranol, glycerol and sulphuric acid with caustic potash (cf. Specification 126,765, [Class 2 (iii)]), and the mixture is printed as in (2).  (5) Quinolinium-hydroxypropane-sulphobetaine is added to the printing preparation of (2) and the mixture is printed as in (2).  (6) Quinolinium-hydroxypropane-sulphobetaine is added to a printing preparation containing the dyestuff obtainable by the process of Specification 29352/10, [Class 2 (iii)], by treating with a dehydrating agent the product of condensation of 1-amino-5-benzoylaminoanthraquinone with 1 - chloro - 5 - benzoylaminoanthraquinone, and the mixture is printed as in (2).  The samples furnished under Sect. 2 (5) are of cotton and viscose artificial silk printed with (IA) a paste containing a mixture of Indanthrene gold orange 3G, dextrin, water and ethanoldiethylamino-oxypropanesulphobetaine added to a thickening containing wheat starch-tragacanth, glycerol, potassium carbonate sodium formaldehydesulphoxylate and water, (IB) a paste containing the same mixture added in smaller amount to a thickening containing crystal gum, glycerol, potassium carbonate and sodium formaldehydesulphoxylate, (IIA) a paste similar to that in (IA) containing as dyestuff Indanthrene blue GCD, (IIB) a paste similar to that in IB containing as dyestuff Indanthrene blue GCD. Sulphobetaines are obtained by condensing tertiary amines, e.g. pyridine, quinoline or diethylethanolamine with halogenalkylsulphonic acids having the halogen and sulphonic acid groups in 1 : 2- or 1 : 3-positions, e.g. b -chlorethanesulphonic acid or a -chloro-b -hydroxypropane - g  - sulphonic acid (cf. Specifications 446,269 and 446,337).