DE1469718B - Process for coloring fiber materials with water-soluble ester salts of leukocupene dyes - Google Patents

Description

3 4

For example, a polyamide fabric is padded at 20 ° C. The goods will

continuously intermediate dried at 100 ⁰ C, for

With an aqueous liquor containing per liter 1 g of the dyes fixing 60 seconds on 180 ⁰ C and then heated substance CI 59106 (Color Index, Vol. 3, 1956) soaped corresponds cooking. A] golden yellow color is obtained, will last with a squeeze effect of about 45% 5.

Claims (1)

1 2 men fiber strands, woven fabrics, knitted fabrics, nonwovens Patent application ^u '^ " ^{made of} natural fibers such as cotton "" ■ or other cellulose fibers, wool, silk and in particular made of synthetic fibers made of linear poly- Process for dyeing fiber materials made of 5 esters, polyamides, polyacrylonitrile and the like, as well as natural and / or synthetic fibers, premixes of natural and synthetic fibers, preferably mixtures of polyester and cellulose. Preference is given to fiber materials made from loose fibers with ester salts of Leukoküpenfarben, linear polyesters and, above all, mixtures of polystals, characterized in that ester and cellulose fibers are suitable,
aqueous preparations are applied to the fiber materials. One advantage of the process is the very simple way of removing the leuco vat esters, which in practice then dries with increasing compliance and is important for the fixation of unskilled workers. without the use of oxidizing agents or because of the very simple Färberezeptes is good acids short time subjected to a dry heating at reproducibility in dyeing large yardages geetwa 170 to 240 ⁰ C. 15 ensures. Application of the method of the present invention to fiber blends of polyester and Cellulose fiber is particularly beneficial here surprisingly, dyeings with very good levelness, tone 20 equality and color depth equality with simultaneous good fastness properties can be obtained. This In the known processes for dyeing fiber mixtures, when dyeing with ester salts of fiber materials with ester salts of leuco vat leuco vat dyes according to the known processes, the fiber materials adhered to the leuco vat esters with the use of oxidizing agents are particularly difficult because of the difficulties stronger coloring of the dye, possibly at elevated temperature, in cellulose fibers slightly a tone and depth of color presence of acids, the effect of an oxy-inequality of the coloring occurs,
-dating agents, such as. B. alkali nitrite, chromate or when dyeing cellulose fibers it can lead to chlorate exposure. The development can avoid hue shifts, which are not easily found in the bath of oxy-sein, the ester salts of leuco vat dyestuffs, which contains an acid-releasing agent, and which are not easily used in the case of subsequent treatment with an acid or dyeing of large quantities; Usually, the holding pad bath will add addition compounds of, however, the oxidizing agent and an acid separating ethylene oxide to alkylphenols. Additive compounds from 7 to ester are added to the solution of the Leukoküpenweise, so that the development takes place with the addition of 10 moles of ethylene oxide and 1 mole of nonylphenol for switching on vapors or dry heating. turn. A disadvantage of this known method of working is that mixtures of leuco vat esters with differing afterwards on mixed fabrics made of synthetic Licher substantivity shifts in hue from fibers, such as, for. B. polyester fibers and cellulose fibers, similar and matching colorations obtained. The addition of these oxyethylation products is achieved by only having the same fiber and uneven coloration. Dyeing of synthetic fibers or synthetic fibers It has now been found that mixed fabrics containing fiber materials, in many cases with water-soluble ester salts of leuco vat dyes, also increase the dye yield on the synthetic fibers in a simple manner, even without the use of synthetic fiber material,
from oxidizing agents and acids, to be colored, 45
if you look at the fiber materials leuco vat nests from an aqueous, optionally thickening agent Example 1
containing preparation applies, dries and then heated for a short time to high temperatures (thermal A 1 g / l of the dye CI 69 526 (color index, fixing conditions) ⁰ C it can be printing pastes or preferably a mixed fabric made of polyethylene terephthalate fibers and padding liquors. and cotton (67/33) with a squeeze effect of The conversion of the leuco vat ester to the dye - about 65% padded out. Subsequently, 55 soaped at the boil as usual and is completed at 13O ⁰ C plastic pigment found among dried for each fiber, fixed for 60 seconds at 210 ⁰ C and then types in practice, conventional heat-fixing. It is obtained, that is, by dry heating to temperatures in, a gray coloration, in which both types of fiber in the range from about 170 to 240 ° C are colored the same for about 5 seconds,
the up to 4 minutes. This apparently results in thermal cleavage of the ester group from the ester salt of the Leuco vat dye and oxidation, for example
Vat dye through the oxygen in the air. In general, the higher the fixing temperature, the greater the dye yield. When mixed with a squeeze effect of about 45% with a fabric, the fixation of the dye takes place at the same time ^{- liquor padded at 2O 0} C, which per liter 1 g of the dye time on both the synthetic fibers and 65 fabric CI 73 361 (Color Index, Vol. 2, 1956) on the natural fibers. holds. , 60 Se-AIs fiber materials heated by the process of dry announce to 21O ⁰ C and, the present invention can be colored soaped at the boil, grain is then dried at 120 ⁰ C is obtained a pink coloration.