DE2027751A1 - Process for dyeing polyethylene terephthalates - Google Patents

Description

Company 3. B r a u η Ρ'68 / 38

3508 Melsungen

Carl-Braun-Str. 1 2027751

Process for dyeing polyethylene terephthalates

The present invention relates to a method of dyeing of all kinds of materials made of polyethylene terephthalate, hereinafter referred to as polyester.

Because of their excellent properties, such as large Tensile strength, durability and resistance to thermal and chemical influences, the polyesters are in great measure Extensively used in the manufacture of textiles, films, foils and other consumer goods.

Since polyester threads are completely unabsorbable and physiologically indifferent in the human and animal body, they have has also acquired a special position in the field of surgical sutures. They are given by the surgeon in the form of monofilament or polyfilament threads, the latter as braided threads Material, used.

So that the suture thread stands out better from the bloody surgical field for surgical purposes, it is expediently dyed dark used. The known methods for dyeing polyesters are unsatisfactory as far as the dyeing of Polyester threads for surgical purposes. In the known HT process, as mainly in water, it is not necessary or only sparingly soluble dyes are used in dispersion work with solvents at high temperature under pressure. Furthermore, certain carrier substances are also used, which are mostly of a basic nature and unphysiological. the long dyeing times and the way the threads are presented for dyeing make the process too time-consuming.

It has now been found that on polyesters with fat and wax-soluble disperse dyes in the presence of solvents Simple and substituted mono- and dialkyl and Mono ™ and Diary! -, rlykol'ithern or dialkyl sulfoxides with alkyl groups acting alone or in a mixture with water

- 2- ■ ■ '109885' / 1806 ^

to 8 carbon atoms in a simple manner with a very short dwell time of the material in the dyebath receives real colorations, all of which Requirements for colored surgical sutures and above in addition to dyed polyester products for textile use, foils, films, etc.

In contrast to a known process in which the dyeing of polyesters with disperse dyes is carried out in the presence of formamides and in which dyeings can only be obtained under pressure and at temperatures of up to 200 ^° C. in the dyebath in a short period of time present method, brilliant colorations without application of pressure achieved already at temperatures around 100 ° to 150 ⁰ C at a residence time of the material to be dyed in the dye bath of a few seconds to a few minutes. The new dyeing process can therefore be carried out continuously.

In addition to dyeing polyester threads, it is also suitable for surgical applications Purposes for the production of dyeings on polyester materials of all kinds, e.g. B. of fibers, yarns, braided or twisted threads, wire, ribbons, fabrics, foils, etc. For the dyeing of surgical sutures, the Dyes must be physiologically sound.

The polyester material, e.g. in the form of wires, braided Threads, from tapes, fabrics or foils, are drawn, preferably continuously, through the dyebath and then rinsed successively in a washing process with hot detergent solution, water and alcohol, then dried, post-stretched and rewound or rewound. With continuous dyeing, the dye liquor is from time to time by adding the individual components regenerated.

Dimethyl sulfoxide has proven to be particularly advantageous as a solvent, both alone and, even better, with the addition of 10 to 50 % water. The dyeing is done extremely quickly.

The dye concentration is variable depending on the dye and the desired color strength and is approximately between 0 ^ 1 and

8 8 1 S / 1 B ii £.

- Jf -

3 fo, related "·; ■, ■" J.es Weight of the polyester material used. The "narrowed concentration is around 0.55 ". The ratio of the volume of the solution to the weight of the material to be dyed is approximately 1: 1 to approximately 100: 1, preferably 30: 1.

The new dyeing process has several advantages. The dyeing time is extremely short even with continuous work; it grants high smoothness and reproducibility in color tone; the polyester material suffers no impairment of its properties; especially the tensile strength that occurs when the dyeing temperature is too high and too long exposure to the solvent wears off, is practically not impaired. The procedure is without great expense and without any special dexterity to be carried out and results in color-fast, veritreckte, immediately usable polyester material.

The following examples serve to illustrate the possible uses of the process of the present invention, without to limit the invention daratif.

Example 1.-

Polyester wire, colorless, size 4/0, is fed m * £ a spool into a dye bath which contains:.

8 1 ethylene glycol monomethyl ether

2 1 water

40 g of the dye 1-methylamino-4-hydroxy-ethyl-aminoanthraquinone.

With a contact time of 50 m / i5O see. and a bath temperature of 130 ⁰ C is continuously colored.

After running through various rinsing baths with about 80 C hot water, hot isopropanol, hot o.5 fig solution of sodium lauryl sulfonate, hot water and isopropanol, the wire is dried with warm air and stretched. The polyester wire is uniform and colourfast colored sky blue.

Example 2.-

Endlessly braided polyester thread, size 2, is continuously passed through a dye bath

90 1 dimethyl sulfoxide, 10 1 water and 500g of the dye 1,4-bis-p-toluidino-antraquinone

~ ⁴ ~ 109885/1806

with a contact time of 3OOm / 6Ö see. drawn with a bath temperature of 140 ⁰ C and further treated as described in Example 1. A polyester thread of a uniform turquoise-green color is obtained, which is absolutely colourfast.

Example 3 «

Polyester tape of 5 mm wide is continuous in a Dye liquor out

9 1 diethyl ethylene glycol dimethyl ether

11 Water _ .—— ».

45 g of the dye (jQ ^ Jf / - fV ^ \ jD_ / ~~ M - Λ / -. VjQ_y ^u - ~ ^ x _r ^ £ ii

at a contact time of 50m / 4min «and a bath temperature of. ' ³ 128 ⁰ C colored and treated further as indicated in Example 1. The tape is evenly and colourfastly anthracite colored »

Example 4 »

500 g of braided polyester thread are made in a strand in a dye bath

4 1 dimethyl sulfoxide and

1 1 water and

35 g of the dye 4- (p) -ethoxyphenylazo-i-naphthol

Dyed for 2 minutes, then washed, dried and stretched. The evenly colored thread is golden brown and colourfast.

As fat ™ and wax-soluble disperse dyes are except the dyes given in the above examples also include the following?

1- (p) -phenylazo-phenylazo-2-N-ethyl ~ naphthylamine, 1,5 + 1,8- (p) -toluidino-an-ftrachinon + 1- (m) -toluidino-4-methylamino-anthraquinone,

1- (m) -toluidino ™ 4-methyl-amino-anthraquinone, Naphthyl-azo- (m) ~ phenylenediamine p

1 ~ xylylazo- <2 ^ naphthol,

1-phenylazOj2,4-resorcinj>

1- (ο) -methoxy ™ phenylazo-2- naphthol.

All fat- and wax-soluble disperse dyes with sufficient Authenticity can be used for the present process »

108885/1806

Claims (5)

1. Process for dyeing polyethylene terephthalates with fat “and wax-soluble disperse dyes, characterized in that in the presence of alone or as a solvent simple or substituted mono- or dialkyl or mono or diaryl glycol ethers acting in a mixture with water or dialkyl sulfoxides with alkyl groups of up to 8 carbon atoms is colored at elevated temperature. 2. The method according to claim 1, characterized in that at temperatures of about 100 ⁰ G to about 150 ⁰ C is dyed. 3. Process according to Claims 1 and 2, characterized in that the dyeing is carried out continuously. 4. Process according to claims 1 to 3 »characterized in that it is colored in the presence of dimethyl sulfoxide alone or with the addition of 10 to 50 % water. 5. The method according to claims 1 to 4, characterized in that polyethylene terephthalate in the form of surgical Sutures to be colored. 1098857 1806