DE2061354B2 - PROCESS FOR MANUFACTURING METALLIC GOLD-TONED FABRICS AND FIBERS FROM POLYESTER - Google Patents

Description

25th

Metallic tinted threads and fibers are known in many variations, but they prepare them Manufacturing difficulties often and the color tones often do not meet the requirements.

In dye liquors, especially coarse denier threads are only dyed on the surface Color film often shows fluctuations in intensity, which are quickly increased with rubbing stress, what eventually leads to the destruction of the colored surface layer

It is also possible to vaporize metals onto threads - cf. B. W. Go ld ie, plastics and rubber, 15. Year (1968), Issue 10, pp. 738-740. - However, the metallized surfaces are hardly resistant to abrasion the metal color character is often lost during vapor deposition; instead of gold tones are brown tones, instead of silver tones shades of gray.

A similar behavior can be observed if you put metal powder on cutlets made from synthetic linear polymers and spun them - here briefly called "spinning" or if you Metal powder is added during the polymer production and the thus colored polymers are spun - here for short as "Condensing in" denotes gold bronzes but also consistently feed in this way of working Braan tones. Silver bronzes to shades of gray. In addition, the threads are stretched through the sharp-edged metal particles are often cut in the running direction. This will increase their properties of use worsened The susceptibility to splicing increases particularly sharply

By spinning or condensing pigments or pigment mixtures, abrasion-resistant mass colorations can also be obtained in shades of gold. The main disadvantage of this process is that the pigments of interest for gold coloring such as
Pigment Yellow 112, Color Index No. 70 600
Pigment Yellow 108, Color Index No. 68 420
Pigment Yellow 83, Color Index No. 21 108
Vat orange 7, Color Index No. 71 105 ⁶ p

are only temperature resistant to a limited extent and differ in the polymer production process, which is usually carried out at elevated temperature and, in particular, partially decompose in the melt spinning process. this leads to on the one hand to color shifts, on the other hand to larger fluctuations in the specific viscosity of the Polymers due to the catalytic influence of the decomposition products. The reproducibility of the specific viscosity and color in chips and threads is therefore only moderately.

The present invention was therefore based on the object of metallically tinted threads and fibers to produce the disadvantages described above not own.

It has been found that metallic gold-tinted threads and fibers of high molecular weight synthetic linear polyesters of excellent color tone and perfect reproducibility of the color tone as a result let produce that one during the polyester production carried out in the usual way Niobium pentoxide hydrate with a water content of at least 5%, preferably 15 to 25%, in one Amount which results in a niobium content of 0.001 to 0.01 percent by weight in the finished polyester adds and the polyester obtained in a known manner by melt spinning to filaments and fibers deformed The gold-colored, shiny threads and fibers obtained by this process are also an object of the present invention.

High molecular synthetic fibers suitable for the production of these metallic gold-tinted threads and fibers linear polyesters can all common fiber-forming polyesters, in particular polyethylene terephthalate, The niobium pentoxide hydrate with the specified water content is used during the on Polyester production carried out in the usual way (esterification or transesterification and polycondensation), advantageous added to the polyester precondensate An addition during the transesterification or to a A later reaction stage is also possible, but less advantageous

The specified water content of the niobium pentoxide hydrate is of decisive importance for the preservation excellent metallic gold tones in the corresponding products. This niobium pentoxide hydrate is a finely dispersed, pure white powder, so no color pigment. It was very surprising that the addition of this pure white substance, especially in such an extraordinarily small amount, the preservation of polyester threads and -fibers of such an excellent metallic gold tone resulted. For other polymers, e.g. polyamides, Polyacrylonitrile etc. are not rendered due to the addition of niobium pentoxide hydrate during the manufacturing process Preserved color. The preservation of the gold hue is specific to ester bonds in the polymer molecule bound; therefore, in addition to pure polyesters, there would also be, for example, polyester amides according to the invention Process accessible, but the metallic gold tone is not as well pronounced here as with the pure ones Polyesters.

On top of the polyester manufacturing process, it's niobium pentoxide hydrate no influence. The threads and fibers are also produced in the usual way Melt spinning; This is particularly useful for coarse denier threads, which are often also called »wires« Process well proven The technological properties such as force-elongation behavior, shrinkage, The ability to straighten up, the tendency to splice, etc. are in comparison with polyester threads and fibers, which are without an addition of niobium pentoxide hydrate was made, does not change the light, abrasion and

ijVasfastness of the gold coloring are excellent

The degree of condensation of the polyester and the Coloring are with the same condensation and J ^ inn conditions can be easily reproduced without additional effort.

One of the great areas of application for metallic, gold-colored polyesters - especially polyethylene terephthalate wires is, among other things, the production of rot Zippers for leather and plastic items, such as bags, shoes, rainwear, etc. Gold-colored multifilaments are preferred for fashionable woven and knitted goods So far only limited corrosion-resistant metal threads have been used, which give their metallic sheen when washed lose quickly and with the basic textile material «5 are only poorly tolerated.

example

Dimethyl terephthalate is reacted with ethylene at 160-215 ⁰ C in the presence of zinc acetate as catalysts tor ic Ins transesterified precondensate be 0.0025 weight percent niobium in the form of Niobpentoxydhydrat dispersed in ethylene glycol, was added. - It was recovered by precipitation from niobium pentafluoride with NHUOH and falls into ftindisperser, pure white form of ^ After gentle drying at 120 ⁰ C in a vacuum, it still contains 20 weight percent of water of hydration. - Now at 240-275 ° C and 03-0.5 Torr with Sb ₂ Os as a catalyst up to a specific viscosity of 035-035, measured in 1% solution in phenol / tetrachloroethane (3: 2) at 25 " C., condensed The polyester chips modified in this way are golden brown in color. They were spun from an extruder with a temperature program of 275/285/275 ° C., drawn in a water bath at 98 ° C. with a draw ratio of 1: 5 and on an iron a surface temperature of 190 "C. The threads have a metallic gold-colored appearance and tear strengths of 3-33 p / dtex with elongations at break of 30-35%. Wires with a specific viscosity ι of over 0.9 do not tend to splice.

Claims (3)

Patent claims: 1. Gold tinted threads and fibers made from synthetic linear polyester, marked with a niobium content of 0.001 to 0.1 percent by weight 2. Process for the production of metallic gold-tinted Threads and fibers made from high molecular weight synthetic linear polyesters according to claim 1 by melt-spinning the polyester modified with the colorant, characterized in that that during the polyester production carried out in the usual way, niobium pentoxide hydrate with a water content of at least 5% in an is Amount which results in a niobium content of 0.001 to 0.01 percent by weight in the finished ester, clogs 3. The method according to claim 2, characterized in that one has a niobium pentoxide hydrate a water content of 15 to 25% is used