DE1469700C - Process for dyeing fiber materials with water-soluble ester salts of leuco vat dyes - Google Patents

Description

obtained a green color in which both types of fiber were uniformly colored.

Example2

A mixed fabric made of polyamide fibers and rayon (67/33) was padded with a squeeze effect of about 65% ^with a liquor that contained in the liter Ig of the dye CI 69 826 (Color Index, Vol. 3, 1956) and 2 ecm 85% contained formic acid. It was dried at 120 ⁰ C, 60 seconds on dry 19O ⁰ C heated and soaped at the boil. A blue coloration with largely identical colors was obtained on both types of fiber.

Example 3

With an aqueous liquor containing 2 g of the dye CI 59 101 (Color Index, Vol. 3, 1956), 0.5 g of the dye CI 73 356 (Color Index, Vol. 3, 1956) and 4 ecm 85% per liter ige formic acid contained, a mixed fabric of polyethylene terephthalate fibers and wool (55/45) was padded ^{at 2O 0 C.} The Waié was continuously dried at between 100 ⁰ C, heated for 60 seconds, 190 ° C for fixing and washed in a weak acetic acid solution. A product was obtained with largely the same color on both types of fiber.

Claims (1)

'' 1 2 when dyeing blended fabrics made of synthetic and , Cellulose fibers or when dyeing cotton with ! »Atentanspiucrj: a yellowing of the natural fiber is to be expected. The amount of the padding liquors according to the invention Process for dyeing fiber materials from 5 acids to be added or their ammonium salts with natural and / or synthetic fibers is dimensioned in such a way that a pH value of less water-soluble ester salts of leuco vat dye than pH 5, preferably pH 2 to pH 4, is established,
substances, characterized in that as acids come according to the claimed process if a solution is applied to the fiber materials, organic acids with a dissociation concentration that, in addition to the leuco vat esters, have low io stants greater than 1 · 10 ~ ^β (measured in 1/10 n solution), quantities of an organic acid and / or one such as, for . B. acetic acid, formic acid, tartaric acid and ammonium salt of this acid, then oxalic acid in question. As suitable ammonium salts, goods treated in this way are dried and for fixation are: ammonium acetate, ammonium formate for a short time of dry heating at about and ammonium oxalate. It is also possible to mix 180 to 210 ° C. 15 genes of the acids mentioned with the ammonium salts to use. The ester salts of the leuco vat dyes are at low temperatures up to about 25 ° C compared to the acidic conditions of the block according to the invention ■ ^ao fleets largely stable. One possibly Occurring partial saponification of the ester salts affects the generally not detrimental, but causes im ■ On the contrary, in many cases a better fixation of the Dye and thus a deeper color. The Um- According to known processes for dyeing fiber 35 setting of the leuco vat ester to form the final color materials with ester salts of leuco vat pigment found under the usual thermosetting substances the with the aqueous solution of the esterification, d. H. when heated dry at about 180 to Salt padded and then dried goods at a temperature of 210 ° C. The dye is used at the same time fixed and then with a sulfuric acid both on the synthetic fibers and on the Treated sodium nitrite solution. Recently, natural fibers have been fixed. ■ which contain the leuco vat esters - When dyeing cellulose fibers, it can lead to the padding liquor certain oxidizing agents, e.g. B. ■ "equal to shifts in color, as they easily occur on-Alkalinitrif or -chromate, catalysts and acid, when large quantities are colored, to add splitting agents, so that already after being brought to the pad bath Oxäthylierungsprodukte drying and thermosetting the actual Dyeing of alkylphenols, especially the addition bonding process, is complete. In some circumstances, instead of heating 7 to 10 mol of ethylene oxide to 1 mol of nonyl dry heating, a steaming process must be added - use of dye mixtures with different named older processes the advantage of the single-bath substantivity color shifts balanced working method.
is that no usable dyeings can be found afterwards. to produce with the commercial blue dyes lying invention consists in the fact that also get involved, Wall-free blue dyeings, for example with the dye. It has now been found that the above-mentioned C.I. 69 826 (Color Index, Vol. 3, .1956) produce single-bath dyeing of fiber material made of natural 45 leave. According to the method according to the invention or synthetic fibers or mixtures of the level dyeings with very good natural fastness properties and synthetic fibers with water-soluble shafts also on fiber mixtures, e.g. B. from polyester Ester salts of leuco vat dyes on and cellulose fibers obtained. Concomitant use of oxidizing agents and catalysts Sators can be dispensed with and already a Fixie 50 present invention can be colored, komrung the Leukoküpenester on the textile material received men fiber strands, woven fabrics, knitted fabrics, nonwovens, if the fiber material with an ester salt u . B. Cellulose from leuco vat dyes and small amounts of fibers, wool, silk, and synthetic fibers from organic acids and / or their ammonium salts such as linear polyesters, polyamides or acrylonitrile-containing liquor, then the so treated 55 and the like. As well as mixtures of natural and Synthetic goods dries and can be used to fix a table fiber for a short time,
dry heating at 180 to 210 ⁰ C subjects. From the magazine »Melliand Textilberichte«, 38 (1957), p. 1157, it is well known that fully synthetic Example 1 table fibers with esterified by sulfuric acid 60 Let leuco vat dyes dye if you use the A liquor containing 1 g of the dye C. I. per liter. Leucoester in the presence of acid-releasing agents to 59 826 (Color Index, Vol. 3, 1956) and 5 g of Ammodas textile material and after drying contains nium acetate, was at 20 ⁰ C on a mixing without the use of oxidizing agents thermos tissue made of polyethylene terephthalate fibers and Baumliert. According to this state of the art, 65% wool (67/33) with a squeezing effect of for example acid donor sol developer D (diethyl tartrate) and 65% are padded on. Then, at 100 ^° C., ammonium sulfate was listed. However, it has dried itself, ^{fixed for 60 seconds at 210 °} C. and then shows that, if these substances are used, it is soaped at the boil as usual and finished. It was