Patent GB-526760-A (GB)
Title: A process for dyeing wool and improved dyestuff preparations for use therein
IPC: D06P1/66
Filed: 1939-03-16
Abstract: 526,760. Dyeing wool; dye preparations. EVEREST, A. E., and WALLWORK, J. A. March 16, 1939, No. 8483. [Classes 2 (iii) and 15 (ii)] Loose wool, sun-faded woollen materials and mixtures of chemically treated with untreated wool are dyed in level shades in a liquor comprising an acid or chrome dyestuff (the term "acid dyestuff" including the Indigosol and Soledon (Registered Trade Mark) colours) and a small proportion of a compound containing a surface-active cation. Specified compounds of this type are Repellat L.T.S. (laurylpyridinium sulphate), Lissolamine (Registered Trade Mark) A or V and Sapamin (Registered Trade Mark) K.W. conc. (diethylaminoethylolcylamide hydrochloride). A dry powdered preparation containing the dyestuff, a small proportion of such compound and a compound containing a surface-active anion may be added to the dyebath. In examples, (1) scoured loose wool, wetted out with boiling water, is entered into a cold aqueous dyebath containing Carmoisime WS, Glauber salt, sulphuric acid and Lissolamine V, the temperature is slowly raised to the boil, boiling is continued for 10 minutes with addition of more sulphuric acid, boiling is then maintained for a further 20 minutes and the wool is rinsed, hydro-extracted and dried ; (2) scoured loose wool, similarly wetted out, is entered into a cold aqueous bath containing Solochrome red BS, sulphuric acid, Lissolamine A and pyridine, the temperature is slowly raised to the boil, so maintained for 30 minutes, then cooled to 80 ‹C. for addition of potassium bichromate solution and again maintained at the boil for 30 minutes, and the wool is rinsed, hydroextracted and dried ; (3) scoured loose wool is entered dry into an aqueous dyebath at 80‹C. containing Milling scarlet G, Gardinol (Registered Trade Mark) Rand Lissolamine A, the temperature is raised to the boil, acetic acid is added and boiling continued for 40 minutes with addition of more acetic acid after 10 minutes and the wool is rinsed, hydro-extracted and dried ; (4) scoured loose wool, wetted out with boiling water, is entered into an aqueous dyebath at 50‹C. containing anthraquinone violet, Gardinol R, Lissolamine A, acetic acid and Glauber salt, the temperature is raised to just below boiling and so maintained for 1 hour with an addition of potassium bichromate after 30 minutes and the wool is rinsed, hydroextracted and dried ; (5) scoured loose wool, wetted out with boiling water, is entered into a cold aqueous bath containing Sapamin K.W. conc. and acetic acid, the temperature is slowly raised to 60‹C., an aqueous solution of Kiton fast yellow 2G and Solway blue S.E.S. is added, the temperature is raised to boiling, so maintained for 10 minutes, more acetic acid is added and dyeing continued just below the boil for 20 minutes and the wool is hydroextracted and dried ; (6) a wetted out lightfaded wool flannel is.entered into a cold dyebath containing Carmoisine WS, Lissolamine A, Glauber salt and sulphuric acid, the temperature is slowly raised to just below the boil and so maintained for 30 minutes and the flannel is hydro-extracted and dried; (7) a similar flannel is entered into a cold aqueous dyebath containing Solochrome black 6 BFA, Gardinol WA, Repellat LTS, sodium acetate and acetic acid, the temperature is slowly raised to just below the boil, so maintained for 20 minutes, then cooled for addition of potassium bichromate solution and boiled for 30 minutes and the flannel is rinsed, hydroextracted and dried ; (8) Carmoisine WS, Lissolamine A and Gardinol R are mixed dry to obtain a powder suitable for direct addition to the dyebath.