DE1131639B - Process for dyeing and printing shaped structures made of linear aromatic polyesters, in particular polyethylene terephthalates, or of polyamides - Google Patents

Description

It has been found that real red-orange dyeings and prints on shaped structures such as Fibers, fabrics or films, made of linear aromatic polyesters, in particular polyethylene terephthalates, or obtained from polyamides when these structures are mixed with an aqueous dispersion of the dye the formula below

Method of dyeing and printing
of shaped structures made of linear

aromatic polyesters,

in particular polyethylene terephthalates,

or from polyamides

N = N ■ /

OH CO-NH-

OCH, applicant:

Farbwerke Hoechst Aktiengesellschaft

formerly Master Lucius & Brüning,

Frankfurt / M., Brüningstr. 45

treated.

The said structures made of linear aromatic polyesters are appropriately colored in the presence or absence of carriers at temperatures between about 95 and 105 ^° C., preferably of about 100 ^° C., or by the high-temperature process in the absence of carriers at temperatures between about 120 and 140 ^° C, preferably between about 125 and 13O ⁰ C, while during printing the printed product useful for shipping a dry heat treatment at higher temperatures, for example at about 200 ⁰ C, is subjected.

The aforesaid dye has good drawability under the dyeing conditions described above on the said structures made of linear aromatic polyesters, and the colorations achieved with them and prints are characterized by good lightfastness.

While dyeing at the lower temperature range mentioned in the presence of carriers and at the higher temperature range mentioned, in the absence of carriers, depth of color and true colorations can be achieved when working at the lower temperature range mentioned in the absence from carriers also a real, but lighter shade, depending on the intended use of the dyed material is much appreciated as a pastel shade.

The dye used according to the process differs from that used in the French Patent specification 1 187 252 known dyes of similar structure, but which have an alkoxy group in have o-position to the carboxamide bond in the arylide residue, due to better lightfastness of the Coloring off.

Dr. Rudolf Kühne, Frankfurt / M.-Unterliederbach,

Dr. Helmut Lindner, Frankfurt / M.-Sindlingen,

and Dr. Wilhelm Happe, Schwalbach (Taunus),

have been named as inventors

In the French patent 1164365 dyes are disclosed for dyeing polyester fibers, the differ from the dye used according to the process in that the Benzene nucleus of the anilide residue is substituted by a methyl group and / or by a chlorine atom. However, these dyes show poor drawability on polyester fibers and those produced therewith Dyeings show a reduced lightfastness.

From the French patent specification 667167 there is a method for coloring materials made of acetyl cellulose known, wherein a dispersion of an arylide of 2,3-oxynaphthoic acid either (a) alone or (b) is applied together with an amine and then (in case b) on the material to be colored is diazotized or (in case a) the material treated with the azo component with a diazo compound is treated. Such a process is unsuitable for dyeing polyester materials.

example 1

5 g of polyethylene terephthalate fibers in the form of a knitted fabric 1 hour at 120 ⁰ C in a bath

209 610/350

colored, which is 1 percent by weight of the finely dispersed dye of the formula

OH CO NH- /

OCH ₃

(obtainable by coupling diazotized aniline with N- [2'-oxy-3'-naphthoyl] -4-methoxyaniline) in 200 ml of water. The orange color is obtained (38 ⁰ Be) and 1 g of nicbtionogenen detergent (polyglycol ether) per liter for 15 minutes at 9O ⁰ C post-treated to improve the fastness to rubbing with 2 g of sodium dithionite, 2 ml of sodium hydroxide solution. The orange dyeing obtained has good fastness properties.

Example 2

25 g of polyethylene terephthalate fabric are printed with a printing paste containing 50 g of the dye mentioned in Example 1, 200 g of Nafka gum, 50 g of naphthol diglycol ether and 700 g of water per kilogram. After drying, it is ^{fixed at 200 °} C. for 30 seconds and finally after-treated reductively according to Example 1. An orange-colored print with good fastness properties is obtained.

Example 3

5 g of a fabric made of polymer! ε-caprolactam are dyed in a liquor ratio of 1:40 in a bath which contains 2 percent by weight of the finely dispersed dye of the formula mentioned in Example 1. Dyeing 1 hour at 100 ° C and then rinsed at 60 ⁰ C. The dyeing thus obtained has excellent fastness properties.

Claims (1)

PATENT CLAIM: Process for dyeing and printing shaped structures made of linear aromatic polyesters, in particular polyethylene terephthalates, or of polyamides, characterized in that they are mixed with an aqueous dispersion of the dye of the formula \ N = N treated. OH CO-NH- OCH » Considered publications:
French patents nos. 667 167, 1 164 365.