Patent GB-511424-A (GB)
Title: Improved process for printing textile materials
IPC: D06P1/36
Filed: 1938-02-11
Abstract: 511,424. Dyeing textiles. DURAND & HUGUENIN AKT.-GES. Feb. 11, 1938, No. 4347. Convention date, Feb. 13, 1937. [Class 15 (ii)] Printing chromium mordant dyestuffs on textile materials, especially' natural silk and regenerated cellulose artificial silks, is effected with the use of a'stable non-coagulable printing paste containing a gum arabic or tragacanth thickening and, as mordant, a chromium salt of a lower fatty acid substantially free from mineral acid constituents and contains also another salt of a lower fatty acid incapable of dissociating during steaming, but contains no aminoacetic, hydroxyacetic or thioglycollic acid or substitution product, salt or ester of such acid. Suitable salts of lower fatty acids are the alkali salts and the alkaline earth salts, insofar as these form no sparingly soluble salts with the dyestuffs, of the saturated monobasic carboxylic acids of the formula CnH2n+1. COOH, wherein n is a whole number not exceeding 11. The process may be used in conjunction with the processes of Specifications 318,469, [Class 15 (ii)], and 427,058. In examples (1) an aqueous paste containing Chromocitronin R, gum arabic or tragacanth, chromium acetate, free from mineral acid constituents, and sodium formate is printed on natural silk, regenerated cellulose artificial silk or cotton and the material is dried, steamed, washed and finished to obtain a deep yellow print; the printed and unprinted areas of the silk and artificial silk remain equally soft; the usual violet chromium acetate may be replaced by the green hexa-acetato-diol-trichromium acetate; (2) to (8) the same materials are similarly printed and finished with the use of aqueous pastes containing urea, a mixture of urea, phenol and furfuryl alcohol as described in Specification 427,058, gum arabic, chromium acetate free from mineral acid constituents, - sodium formate and as duestuff, (2) benzidinedisulphonic acid# p-cresotinic acid (2 mols.) (c.f. Specification 215,379, [Class 2 (iii)]), (3) m-aminobenzene-azo-salicylic - acid# 1-acetylamino-8-naphthol-4: 6-disulphonic acid (c.f. Specification 231,885, [Class 2 (iii)]), (4 4- nitraniline-2-sulphonic acid#1 : 8 : 3 : 6-aminonaphtholdisulphonic acid #3-amino-4-sulphobenzene-azo-salicylic acid (c.f. Specification 422,287), (5) the product of the action of alkali upon diazotized 4-amino-2-sulphobenzene-azo-salicylic acid (if Specification 283,482, [Class 2 (iii)]), (6) the product of the action of calcium hypochlorite upon 4-amino-2-sulphobenzene-azo-salicylic acid (c.f. Specification 349,609), (7) Chromorhodin B, (8) Modern violet with, in this case, an addition of acetic acid; (9) to (13) the same materials are similarly printed and finished with the use of aqueous pastes containing Chromocitronin R, urea, gum arabic, chromium acetate free from mineral acid constituents, and, as salt of a lower fatty acid, (9) sodium acetate, (10) lithium acetate, (11) sodium propionate, (12) sodium valerate, (13) lithium laurate. Specifications 435,701 and 453,834 also are referred to. The Specification as open to inspection under Sect. 91 'comprises also (a) the use in printing natural silk of similar printing pastes in which the chromium mordant contains mineral acid constituents or is a chromium salt of a mineral acid, (b) the use as the auxiliary salts of ammonium formate, salts of organic bases, e.g., triethanolamine formate, and ammonium monochloracetate; (c) the use of sodium lactate instead of sodium formate in Example 1. This subject-matter does not appear in the Specification as accepted.