Patent GB-376334-A (GB)
Title: Improvements in or relating to the colouration of textile materials
IPC: D06P5/15
Filed: 1931-04-01
Abstract: Coloured pattern effects are produced on textile materials by discharging a colour in selected parts and simultaneously or otherwise colouring said parts with colouring matters resistant to said discharge, and discharging the said colouring matters locally on said selected parts.  The process may be carried out by discharging the ground colour in selected parts by means of stannous compounds and simultaneously or otherwise colouring said parts by colouring matters resistant to stannous compounds, and discharging the said colouring matters locally on said selected parts by means of sulphoxylates.  The sulphoxylate may also locally discharge the colour dischargeable by the stannous compound.  The discharging agent may be present on the material prior to the application of the colour to be discharged thereby, e.g. yarns impregnated with the said discharging agent are woven with other yarns into a fabric to which the dischargeable colouring matter is subsequently applied.  The process also comprises applying to selected areas, in either order and before or after applying a ground colour, a composition comprising a discharging agent for the said ground colour and a colouring p  matter resistant to said discharging agent, and a composition comprising an agent which will discharge the ground colour and also the colouring matter of the other composition, so that at least part of the second mentioned discharge composition falls on areas covered by the first.  The process may be modified so that excess of one discharging agent is destroyed before a further discharging agent is applied to the material, e.g. by steaming or ageing.  More than two discharging agents may be employed, if desired, and also oxidation discharges.  The process is particularly applicable to materials made of or containing organic derivations of cellulose, e.g. cellulose esters and ethers but is applicable to textiles generally.  The pattern effects may be produced as follows: (a) Cellulose acetate is dyed with a colour dischargeable by both zinc formaldehyde sulphoxylate and stannous chloride discharges.  It is then printed with the sulphoxylate with or without a resist colour, cover-printed with a stannous chloride discharge containing dyestuffs resistant to stannous chloride but dischargeable by the sulphoxylate, aged and steamed; (b) A fabric grounded as in (a) is printed with a stannous chloride discharge containing dyestuffs resistant to stannous chloride but dischargeable by sulphoxylate and after ageing is cover-printed with a sulphoxylate discharge containing a resist dyestuff; (c) A cellulose acetate fabric is printed with a sulphoxylate resist with or without resistant dyestuffs.  It is then dried, cover-printed with a second composition containing an aniline black resist agent, e.g. an alkali, together with dyestuffs resistant thereto but not resistant to sulphoxylate, dried, padded with an aniline black liquor, aged, steamed if necessary, chromed and washed; (d) A cellulose acetate fabric is printed with an aniline black resist composition containing dyestuffs which are not dischargeable thereby but are discharged by sulphoxylate and dried.  It is then cover-printed with an aniline black resist composition containing sulphoxylate with or without dyestuffs resistant to sulphoxylate, dried, padded with an aniline black liquor and finished; (e) A cotton fabric is dyed with colours dischargeable by sulphoxylate and by stannous discharges and prepared with a suitable mordant.  It is then printed with a sulphoxylate composition with or without dyestuffs resistant thereto, dried, and cover-printed with a stannous chloride discharge containing dyestuffs resistant to stannous chloride but dischargeable with sulphoxylate and finished; (f) A cotton fabric dyed and prepared as in (e) is printed with a stannous chloride discharge containing dyestuffs resistant to stannous chloride but discharged by sulphoxylate, dried, cover printed with a sulphoxylate paste with or without dyestuffs resistant to sulphoxylate.  It is then aged and finished; (g) A cellulose acetate fabric coloured with a ground colour as in (a) above is printed with a sulphoxylate discharge with or without resist dyestuffs, dried, aged and washed.  It is then cover printed with a stannous chloride discharge containing dyestuffs resistant to stannous chloride, aged and washed.  The intermediate drying and ageing destroys the sulphoxylate so that the colour produced by the cover print is superimposed on that of the first print where the two prints overlap; (h) A cotton fabric is coloured with a ground colour and prepared with mordants as in (e) above and is printed with a sulphoxylate composition with or without resistant dyestuffs.  It is then dried, aged and cover printed with a stannous chloride discharge containing dyestuffs resistant to stannous chloride but dischargeable by sulphoxylate. It is then again aged, fixed and washed.  A list of suitable dyestuffs is given.  In examples (1) a cellulose acetate fabric is dyed red with 4-nitro-2-methoxybenzene - 1 - azo - 4<1> - diethylaminobenzene and printed in a floral design with a composition containing p-hydroxybenzene-azo-1-phenyl-3-methyl-5-pyrazolone and decrolin, dried and immediately cover printed with a design comprising numerous small spots with a composition containing Malachite Green, sodium sulphocyanide and stannous chloride and finished; a yellow floral design on a red ground is obtained with a green spotted pattern on the ground only; (2) a cellulose acetate fabric is dyed as in (1), and then printed in a floral design with the Malachite Green composition in (1), dried, cover printed with the decrolin composition in (1) and finished; a green floral design is obtained on a red ground with a further spotted design in yellow which appears both on the ground and where the printed and cover-printed designs overlap; (3) an undyed cellulose acetate fabric is printed in a floral design with a composition containing p-hydroxybenzene-azo-1-phenyl-3-methyl-5-pyrazolone, sodium acetate and sodium formaldehyde sulphoxylate, dried, coverprinted in an all-over pattern of fine spots with a composition containing Malachite Green and sodium acetate, dried, padded with an aniline black liquor and finished; (4) same as (1) except that before cover-printing the print is aged.  Specifications 341,408 and 342,333 are referred to.