DE1469700B - 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% from a liquor containing 1 g of the dye CI 69 826 (Color Index, Vol. 3, 1956) and 2 ecm 85 per liter % formic acid contained. 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 ig ^e contained formic acid, a mixed fabric of polyethylene terephthalate fibers and wool (55/45) was padded ^{at 20 0 C.} The Waié was continuously dried at between 100 C, heated for 60 seconds on 190 ⁰ 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)

■ ^{; :: l 2} when dyeing blended fabrics made of synthetic and cellulose fibers or when dyeing cotton with Claim: 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 which, in addition to the leuco vat esters, have low io stants greater than 1 · 10 ^-6 (measured in 1/10 n solution), amounts 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 dries and for fixation may be mentioned: ammonium acetate, ammonium formation for a short time of dry heating at about and ammonium oxalate. It is also possible, Mix-180 subjects to 210 ⁰ 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 2 ° fleet largely stable. One possibly Occurring partial saponification of the ester salts generally does not have a disadvantageous effect, but rather causes the On the contrary, in many cases a better fixation of the dye and thus a deeper coloration. The Um- According to known processes for dyeing fiber, setting the leuco vat ester to the final color material with ester salts of leuco vat dye pigment, the usual thermosetting conditions include the padded with the aqueous solution of the ester, ie with dry heating at about 180 to salt and then dried Goods thermo- 210 ⁰ C instead. At the same time, the dye is fixed and then treated with a sulfuric acid solution on both the synthetic fibers and the sodium nitrate solution. Recently, natural fibers have been fixed. which contain the leuco vat esters- __ When dyeing cellulose fibers, it can be dyed out. Padding liquor certain oxidizing agents, e.g. B. equal to shifts in color, as they easily occur - alkali nitrite or chromate, catalysts and acid, when large quantities are dyed, adding splitting agents so that after the pad bath, oxyethylation products, drying and thermosetting, the actual dyeing. 35 of alkylphenols, especially Anlagungsverbindunvorgang has ended. Under certain circumstances, a steaming process is required instead of the gene from 7 to 10 moles of ethylene oxide to 1 mole of nonyl dry heating. phenol, to be added. This method offers the advantage of the one-bath substantivity shifts in color shade, compared to the application of dye mixtures mentioned at the beginning, with the different older methods mentioned above. A disadvantage of this known method 40 and dyeings with the same ends are obtained,
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 stains, e.g. B. 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- 5 ° present invention can be dyed, komrung the Leukoküpenester on the textile material received men fiber strands, woven fabrics, knitted fabrics, nonwovens, if the fiber material with an ester salt and the like. Made of natural fibers, such as z. B. cellulose from leuco vat dyes and small amounts of fibers, wool, silk, and synthetic fibers from organic acids and / or their ammonium salts z. B. linear polyesters, polyamides or acrylonitrile-containing liquor, then dries the so treated 55 and the like and mixtures of natural and synthetic goods and for a short time a table fibers in question,
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 B e i s ρ i e 1 1 table fibers with sulfuric acid esterified 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 ge-ammonium sulfate was listed at 100 ° C. However, it has dried, 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