DE1033372B - Process for the production of spun-dyed structures from high-molecular synthetic materials - Google Patents

Description

Process for the production of spun-dyed structures from high molecular weight Synthetic fabrics have been found to be very valuable. spun-dyed structures. like threads or fibers, obtained from high molecular weight synthetic materials. if the solutions or melting of the high molecular weight synthetic materials before the deformation indulin and hzw. or adding nigrosine-like dyes and then deforming them.

Examples of high molecular weight synthetic substances are: Polyvinyl chloride, polyacrylonitrile, polyethylene, polystyrene, polyacrylic ester, terephthalic acid polyglycol ester, Polyamides, polyurethanes and copolymers.

Indulin or Nigrosine fibers. which is for the present case Suitable methods are, for example: Indamine blue R (Schultz. 1931.

7 edition. No. 981), Indulin 6 B base (No. 982). Indulill B (No. 984), Paraphenylenblan (No. 983), nigrosine fuel-soluble (No. 985). Nigrosine DW (No. 986). Parahlau (No. 987).

The dyes are used as such or in the form of their salts or after the usual digestion with fatty acids the melts or the solutions of the high molecular weight synthetic substances in the solvents customary for this purpose and then processes these into threads in a lekai'nter manner. Fibers. Ribbons or other shaped bodies. The dyes can also be used as a very finely divided powder. how you z. B. obtained by grinding or kneading with dispersants. applied will. Also mixed with pigments. such as B. titanium dioxide or soot, leave them familiarize yourself well with the high molecular weight synthetic materials.

In the manner described, very evenly shaped structures are obtained, which have a surprisingly high gloss. The dyeings are very lightfast and have a high alkali acid resistance.

It is hekann from the German patent specification 895 959, as spin dyes for threads or fibers made of polyethylene terephthalate dyes from the class of Use vat dyes and the aminoanthraquinones. In the German patent specification 811 982 the use of a water-insoluble esters from leuco vat raw materials of the Anthraquinone series and low molecular weight carboxylic acids as pigments for dyeing thread-forming Art masses were written.

In the case of the colorants mentioned in these two German patents it is relatively high molecular weight, insoluble in the plastics to be colored Pigments. which one must wrestle in as fine a distribution as possible before use (See the examples in patent specification 811,982) or which are slow and hot distribute relatively high temperatures homogeneously in the plastic (see patent specification 895 959). It is also a representative of one that is considered to be particularly lightfast Dye class.

In contrast, in the present process for coloring plastic masses the easily soluble dyes of the indulin and nigrosine series used, which are used in the Solutions or melts of the plastics before the deformation clogs.

It is from the Swiss also cited Patent 305 685 known, spun-dyed threads made of polyacrylonitrile or Preparing copolymers of acrylonitrile in this way. that one at Dissolving the polymers adds such dyes. which are soluble in their solvents are. and then spinning the spinning solution obtained in this way. As dyes are only Mono- and polyazo dyes mentioned, which have a solubility in dimethylformamide of 90%, furthermore acidic wool dyes. which dissolve up to about 60%, as well as the (by the way, already recommended for this in German patent specification 811 982) Vat dye leucoester. There are more dyes in the fibers obtained in this way or less finely divided, but not dissolved or not completely homogeneously dissolved. One must therefore use relatively large amounts of the dyes to achieve deep colorations.

The indulin and nigrosine dyes to be used according to the invention are also not mentioned in Swiss patent specification 305 685. They have over the fabrics named there. that they are in the dope are completely soluble so that they do not need to be filtered. they are also completely homogeneously dissolved in the finished fibers etc. and are therefore very extensive. It was, however Surprisingly, even with small amounts of Nigrosine and indulin dyes get very deep black colorations and that these The dyeings are extremely lightfast. The formally analogous rosindulins that are are also readily soluble, on the other hand, result in dyeings that are much less resistant to Lidl.

In the following examples, those given for the dyes refer to Numbers on the relevant numbers in the dye tables of G. 5 ch u lt z, 7th edition (1931).

If parts are mentioned in the examples, they are parts by weight.

Example 1 In a solution of polyacrylonitrile in tetrahydrofuran about 3% indamine blue B (No. 981), based on polyacrylonitrile, is entered. When the solution is complete, it is filtered if necessary and then in a known manner spun into threads. After the usual completion of the threads, you get a uniform Violet-tinged black thread material of very high lightfastness and excellent Acid and alkali resistance.

Instead of polyacrylonitrile, it is also possible to use polyvinyl chloride. Furthermore, indulin 6 B or its base (No. 982) or the Use free color acid from Indulin B (No. 984).

Example 2 A solution of polyacrylonitrile in dimethylformamide 4'ovo nigrosine soluble in fuel (No. 985), based on polyacrylonitrile, added, whereupon the solution is spun in the usual way. Filaments dyed deep black are obtained of high gloss and very good general fastness properties. Soluble in fuel instead of nigrosine the sulfated dye can also be used with similar success.

Example 3 In a solution of 100 parts of polyacrylonitrile in dimethylformamide one enters 7 parts of a powder. that can be done by finely grinding an oil mixture from 3 parts of indulin 6 B base (No. 984), 3 parts of carbon black and 4 parts of a dispersant has prepared.

Then it is spun in a known manner. The threads obtained are colored deep black and show an advantageous gloss. The colorations are as well extremely lightfast and boil-resistant.

Example 4 A solution of 100 parts of polyacrylonitrile in 500 parts 6 parts of nigrosine are added to dimethylformamide by fusing 1.7 parts Soluble in fuel (No. 985) and 0.75 parts of stearic acid produced mixture to and spun into threads as usual. These are characterized by particularly good general fastness properties the end.

Instead of stearic acid, palmitic or oleic acid can also be used. You can also use mixtures of indulin- or nitrosine-like dyes, such as Nigrosine soluble in fuel. with citric acid, tartaric acid and / or with sulfamic acid Add H2 NS 03 H to the polyacrylonitrile solution and then spin.

Example 5 100 g of e-caprolactam and 2.5 g of hexamethylenediamine adipate are heated with 3 g of indaminblan B (see Schultz, color tables, no. 981), with the dye goes into solution. The melt is placed under nitrogen in a glass tube heated to 2650 C until the polycondensation has taken place, then at 2650 C through spun out a nozzle and stretched to about 4 times the original length.

Deep black threads are obtained.

PATENT CLAIMS: 1. Process for making spun-dyed Formed, like threads or fibers, from human-molecular synthetic materials, thereby characterized in that one has solutions or melts of high molecular weight synthetic Adds nigrosine and / or indulin-like dyes to substances and then deforms them.

Claims (1)

2. The method according to claim 1, characterized in that the Solutions or melts of the high molecular weight synthetic substances nigrosinoder / and indulin-like dyes, which can be prepared beforehand by finely grinding or kneading with has transferred a dispersant in very fine distribution, for itself or in Mixture with other coloring or colorless products, which may also be have been brought in finely divided form, incorporated. Publications considered: German Patent No. 895 959, 811,982; Swiss patent specification No. 305 685.