Patent GB-376797-A (GB)
Title: Improvements in the colouration or treatment of textile materials made of or containing cellulose esters or ethers
IPC: D06P3/34
Filed: 1931-02-11
Abstract: Cellulose esters or ethers, dyeing; vat dyes, dyeing with; printing.--To improve the penetration into textile materials made of or containing cellulose esters or ethers of dyestuffs and/or discharging agents having relatively little affinity therefor, the same are applied in conjunction with an organic liquid which is a solvent for the cellulose derivative by printing, stencilling, padding, spraying or other method of mechanical impregnation, and the solvent is then evaporated without steaming.  The dyestuffs may be (a) acid wool or direct dyes such as Formyl violet 5BN, Chromazurine E, Cupranil brown B, Alkali blue, Metanil yellow, Milling red G, Cloth fast red B, Polar brilliant red B cone., Benzyl green B, Palatine black B, Cyanol FFG, Milling orange, Orange II, Neolan orange R, Acid wool blue N, Amacid fast light yellow 2G, Wool fast blue BL, Sulphoflavine brilliant FF, Alkali blue 4B, Acid violet 5BE, Sulpho green J80, Tartrazine, Cloth red B, Chloramine black E2B, Chloramine black ER extra, Modern black N, Chrysophenine, Chrysophenine direct J, Diamine fast scarlet 2B, (b) Palatine orange, (c) Full brilliant green NB, (d) vat dyes of the indigoid or anthraquinone series having relatively little affinity for the materials, whether applied as such or as esters of their leuco compounds, such as Golden orange R or Ciba blue 2BD, (e) basic dyes, difficult of application, such as Chromacetine blue S, Rhoduline blue 6G, Benzyl violet, Induline, Acridine orange, Acridine red PS, Rhodamine B, Rhoduline yellow 6G, Auramine OO, Fuchsine, Capri blue GON, Rhodamine 6G, Setocyanine, Acridine brown, Acridine orange brilliant ES. Specified organic liquids are ethyl lactate, diacetone alcohol, diethyl tartrate, dibutyl tartrate, benzyl alcohol, and the esters and ether-esters of glycols, e.g. methyl and ethyl glycol monoacetates.  The discharge agents used may be such as act by oxidation, e.g. chlorates or chromates, or by reduction, e.g. hydrosulphites, sulphoxylates, formaldehyde hydrosulphites or sulphoxylates, stannous chloride or stannous chlorothiocyanate. Printing or stencilling preparations may contain the usual thickeners and any other desired assistants, such as ethylene thiodiglycol (which has a delustring action on cellulose acetate), diethylene glycol or glycol.  The following examples are specified: (1) A fabric of cellulose acetate yarn is printed with an aqueous paste containing any one of the dyestuffs specified above, ethylene thiodiglycol, ethyl lactate, gum arabic, and colloresine, dried at 70-75 DEG  C. to vaporize the ethyl lactate, washed, soaped, and rinsed; if the fabric has been preliminarily delustred, the printed parts have an enhanced lustre.  (2) An acetate silk-viscose fabric, dyed with Chlorazol black BH diazotized and developed with 2 : 3-oxynaphthoic acid, is printed with an aqueous paste containing an Indigosol (Registered Trade Mark) colour, ethylene thiodiglycol, stannous chloride, gum arabic, and ethyl lactate, dried at 70-80 DEG  C. to vaporize the ethyl lactate, soaped at 60-70 DEG  C. to remove the Indigosol taken up by the viscose, rinsed first in soda and then in water, treated for 20 minutes in a bath containing sodium nitrite and hydrochloric acid to develop the Indigosol on the acetate silk, and rinsed first in water, then in soda, and finally in a bath containing soap or sodium acetate; specified Indigosol colours are Indigosol blue O4B, Indigosol green AB, Indigosol golden yellow 1GK, Indigosol scarlet HB, Indigosol pink 1R and Indigosol brown 1RRD.  (3) An acetate silk fabric is printed with an aqueous paste containing Chloramine black E2B, ethylene thiodiglycol, colloresine and ethyl lactate, dried at 70-80 DEG  C. to vaporize the ethyl lactate; for treating a fabric which has not been delustred disodium phosphate may be added to the paste.  (4) An acetate silk fabric is printed with an aqueous paste containing modern black N, Rhoduline yellow 6G, ethylene thiodiglycol, colloresine, ethyl lactate, and sodium hydrosulphite and dried at 70-80 DEG  C. to vaporize the ethyl lactate.  (5) An acetate silk-cotton or acetate silk-viscose fabric is printed with an aqueous paste containing Acid wool blue N, Orange II, ethylene thiodiglycol, colloresine, and ethyl lactate, with or without an addition of Cloth red B, and dried at 70-80 DEG  C. to vaporize the ethyl lactate.  (6) A cellulose acetate fabric is grounded by padding or printing with a pin roller with an aqueous mixture containing Orange II or other dischargeable dyestuff, ethyl lactate, ethylene thiodiglycol and colloresine, dried at 80 DEG  C., rinsed, soaped, rinsed, dried, and subjected in known manner to a discharge operation using an aqueous paste containing zinc formaldehyde sulphoxylate, gum arabic and ethyl lactate to obtain a slightly matt white on a lustrous coloured ground.  (7) A cellulose acetate fabric is dyed with a direct black with the aid of ethyl lactate, printed with an aqueous paste containing Methylene blue, gum arabic, stannous chloride, ethyl lactate, and citric acid, dried at 70-80 DEG  C. to vaporize the ethyl lactate, washed, soaped, and rinsed to obtain a blue print on a black ground.  Specifications 259,265 and 269,128, [both in Class 2 (ii), Cellulose &c.], are referred to.