DE1435630A1 - Process for the production of threads and fibers from polyethylene oxybenzoate - Google Patents

Description

POLYESTEEETEER DEVELOPMENT CO., LTD, S O K.I O / Japan

¹¹ Process for the production of threads and fibers from polyethylene oxybenzoate ^w

The present invention relates to methods for Production of τοη threads and fibers of excellent quality from polyethylene oxybenzoate

The goal of the invention is to create Process for the production of threads and fibers with high heat shrinkability, which retain their excellent quality even after shrinking and are good for use in Production strongly TOluminous esp. bulky textiles are suitable.

Another object of the invention is to create τοη methods to produce τοη threads and fibers of high tensile strength, elasticity and heat resistance, which are good for use

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are suitable for the production of the commonly used textiles.

The polyethylene oxybenzoate used in the present invention include polyesters, which are composed essentially of units as defined by the following general formula

-00H ₂ CH ₂ O- / \ -00-

Preferably, the invention is carried out through the use of polyethylene oxybenzoate fibers, which according to the usual Melt spinning processes are generated and are essentially neither oriented nor crystallized.

The term used herein ·· ⁿ non-orrentierte parsers are means a Paser having a birefringence (Δ) of below about 0.05 "as measured by the usual method using the D-line of sodium. Furthermore, the term ^w uncrystallized fibers ^H used herein means those with a degree of crystallization (x) of less than 0.15 »calculated according to the following equation

■ 4- - -ir * -M ^ -

In this equation, ^tt d ^w denotes the density of the polyethylene oxybenzoate fibers, measured by the density gradient tube method, described in the Journal of Polymer Science, Vol. 21, page 44 (1956) by LH Tungetel. K ₁ is a constant value of 1.384 for the density of the crystalline part of polyethylene oxybenzoate, K _{2 is} a constant value of 1.312 for the density of the amorphous part of polyethylene oxybenzoate through which Br-

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finder measured and published in the Journal of the Chemical Society of Japan, Vol. 81, page 852 (1960) ".

Unoriented and uncrystallized polyethylene oxybenzoate lasers can hardly "at a temperature below 70 ° with any practical effect can be stretched. However, the stretching takes place rapidly at a temperature above 70 °, preferably of over 85 °

However, it has now been found that such lasers could not always be stretched in a stable state, and therefore the resulting drawn lasers had varying properties even when at constant temperature and at were drawn at a constant draw ratio. That is, even if such unoriented and uncrystallized lasers at a constant stretching ratio and at a constant temperature which, depending on the stretching ratios, over a certain amount lower limit, which fluctuates between 85 ° and 90 °, thus stretched depending on the type of medium for heating, the contact time with the same and the rate of deformation should be, one must stretch them in one lall at a very low tension and in another lall at a very high voltage and therefore no intermediate voltage can be used. Besides, they're that way stretched lasers due to their properties are not uniform} this is shown in the enclosed ligures 1, 2 and 3

ligur 1 of the same shows the relationship between the stretching ratio, the temperature and the stress created in the lasers, which were stretched in contact with a heating plate.

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Figure 2 shows the relationship between the tension created in the fibers under different draw ratios and the tensile strength of the stretched fibers

Figure 3 shows the relationship between the tension created in the fibers under different draw ratios and the deformation when the drawn fibers break

In the attached FIG. 1, curves 1-8 give the stretching ratio under which the fibers were stretched «namely in turn 2.5 - 3.0 - 3.3 - 3.5 - 4.0 - 4.3 - 4.5 and 4.8 ·

As can be seen from curves 1 and 2., "amounts to a temperature of 70 ° and when the fibers under a draw ratio of 2.5 respectively. 3.0 are stretched, the tension caused in the same to over 10 kg / mm, which in a Increase in temperature decreases in a linear relationship There is no abnormal phenomenon in these curves

If, however, the curves 3-8 in the F _a iie caused in the fibers voltage suddenly between high and low values vary in response to temperatures only slightly above or below certain temperatures, which depend on the draw ratios, then missing in in all these cases the tensions between them. For example, curve 7 shows a case where the tension suddenly fluctuates between about 10 kg / mm and about 1 kg / mm if the constant temperature is slightly above or below the constant temperature of over 100 °.

¹ HeYUi the stretching was started at 70 °, then the initial tension was about 15 kg / mm % and gradually decreased with increasing temperature. But as soon as the temperature

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had reached about 100 °, the tension suddenly decreased from about 8 kg / am to about 0.7 kg / mm, and continued to increase But then the temperature is very slow · On the other hand, if the stretching was started at 110 °, then it was the initial one Tension to about 0.5 kg / mm, which increased only very slowly with decreasing temperature, to - as soon as the temperature dropped height of about 100 ° - all of a sudden of about 0.7 kg / mm to rise to 8 kg / mm and thereafter to decrease in temperature to gradually increase again. You stretching temperature at which if the tension changed quite suddenly, it was essentially constant, depending on the degree of stretching, if all other conditions were constant during stretching The dash-dotted curve 9 shown in FIG. 1 connects the points with one another, in which the tension suddenly changed. The area on the right-hand side of this curve 9 does not contain any stable ones Relationships for the stretching processes

In addition, it was observed that the tensile strength and the elongation at break of the fibers, which had been stretched at a stretching ratio of 4 »5 at a temperature of 100 ° under a tension of 0.6 kg / mm, amounted to 2.4 g / mm. d and 80-6, respectively, while the same key figures for the fibers, which were stretched under the same stretching ratio but at a temperature of 98 ° under a tension of 9 kg / mm, were adjusted to 4.5 g / d and $ 31> respectively.

From the observations just described one can conclude that that the quality of the drawn fibers is influenced to a large extent by that produced therein during drawing Spanramg and that you, even if the fibers are under you

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high draw ratio stretched v / earth, at low tension no flawless fibers can be obtained

As is apparent from Figures 2 and 3, there is a clear correlation between the quality of the drawn filaments and the voltage were ₉ under which stretched the same "

Ben figs. 2 vwA 3 it can also be seen that it is essential to apply a tension of over 3 kg / mm without causing fiber breaks in order to maintain the "b & fibers" must be dee hatched area shown in FIG. 1 This area is referred to below as ^l! available Streckbereieh ^M ·

The curves 1-8 shown in Figure 1 experience depending on the type of BrhitZungsvorrichtungen used or media, such as _e hot plate, hot water, steam, infra rotstrahler, a numerical change, but not in shape · As a result, is the dash-dotted curve 9j which in the figure 1 delimits the Streckbereieh available, within the temperature range of 80 - generally speaking 120 ° · when the stretching is carried out using a heating medium such as _ζ β Β β water "having good thermal conductivity or by if the fibers are left in contact with the medium for a longer period of time, the boundary line of the available stretching range shifts towards a lower temperature. Nevertheless, the relationship between the quality of the stretched fibers and the tension under which they were stretched always remains

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still preserved (Figures 2 and 3)

It has been found that stretching is the "test" for one Stretch ratio greater than 2.5 »" at a temperature in the range from 70 - 120 and under a tension of more than 3 kg / mm, O takes place

The fibers, which have been drawn within the available drawing range, are at a temperature of 90-180 ° subjected to an additional stretching process in order to achieve a total stretching ratio of over 3.5, thereby reducing the quality the fiber is improved »

Table 1 below shows the properties of fibers which were drawn under the ratios given below: In experiment 1, unoriented and uncrystallized fibers were drawn within the available draw range, ie in particular at a draw ratio of 3 »8 at a temperature of 92 ° and under a tension of 4 kg / mm. In Experiment 2, the fibers previously drawn in Experiment 1 "were subjected to an additional drawing process at a temperature of 120 °, in fact at a drawing ratio of 1.2, so that a total drawing ratio of 3f8 χ 1.2 = around _c 4.6 got * In experiment 3, unoriented and uncrystallized fibers were stretched directly to a stretching ratio of 4f6 at a temperature of 120 °, namely under a tension of 0.4 kg / mm, i.e. outside the available stretching range.

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tab 143563G e 1 1 e 1 Elongation at Young's modulus
Fraction (*) (Wmm ² ) Properties of the drawn fibers 42 485 attempt tensile strenght 28 630 No. 3.8 93 210 1 4.5 2 2.1 3

As can be seen from the table above, the drawn fibers of test no. 2 the best quality in comparison to the drawn fibers according to the tests Ko _β 1 and 3.

The KristalliBation of P _o lyaethylen-oxybenzoate is not so rapid that the degree of crystallization of such stretched fibers is sufficiently high. Therefore, they shrink considerably when they are heated in the relaxed state, and they are therefore unsuitable for general use in textiles which are said to have little heat shrinkage at a temperature of 150 °. An improvement in terms of heat shrinkage is achieved by a heat treatment at a temperature of 120-200 ° under tension in order to avoid shrinkage of more than 5 i ° , to maintain the length or to stretch the same so that no break occurs intent to accelerate crystallization while maintaining molecular orientation. During this process one must avoid a shrinkage of more than 5 $ in length, because otherwise the molecular orientation is disturbed and the Young's modulus drops. Will be strong and stiff fibers

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then it is recommended to heat treat the pre-stretched Fibers "at a temperature of 120 - 200 ° below a to carry out such tension, 3 the fibers can stretch in the first stage from a 5% shrinkage to 5 $, while they are in a second stage beyond $ 5 like that be able to stretch far so that no break occurs »

Table 2 below shows the effect of heat treatment of the drawn fibers under tension, with the unoriented and unkriettllisiert fibers at a temperature beforehand of 95 ° and under a tension of 7 kg / mm Draw ratio of 4 »4 had been drawn.

Test Ho · 1 relates to the drawn fibers before the heat treatment, test Ko. 2 to the fibers treated under tension at a temperature of 170 °, the length of which was maintained. In Experiment 3 · Uo treated under tension and at a temperature of 160 ° fibers by 3 i "shrink · allowed in Experiment No. 4, the fibers treated under tension and at a temperature of 160 ° were allowed a 20 #Lge elongation. Finally, the fibers treated under tension at a temperature of 140 ° (test No. 5) were kept in length, whereupon at a further heat treatment at a temperature of 170 ° under tension allowed an elongation of the fibers by 30 #.

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Tabel

Verse,

Eo.

Properties of the fibers

Degree of Crystallization

Train ~

strength (g / ä)

Denotation
he) at break.

Young module kg / mm

Shrinkage at 150 ^° C

1. 0 _? 32 4.3 38 520 2 0.48 4 _$ 4 32 575 0.45 . 4.1 40 470 4th e _; 48 4.6 28 740 5 0.51 5.2 21 920

13th

The fibers heat-treated in this way under tension still have an internal tension of heat shrinkage, as shown in the column «Shrinkage bed 150 ⁰ O" in Table 2. However, this is the case with certain textiles, the fibers of which do not have such heat shrinkage Such heat shrinkage can be completely avoided if the lasers are cured by heat in the relaxed state, with a shrinkage of more than 5 # permitted or by allowing the fiber length to change freely at a temperature of 120-200 ° »

Table 3 below shows some test results for comparison. The attempt No. 2 relates to the heat curing of pretreated fibers from Ho. 2 of the experiments in Table 2, at a temperature of 170 ° in the relaxed Condition with 8% shrinkage. Experiment Ho 4 refers to the heat curing of pretreated fibers from Experiment Ho »4 in Table 2, namely at a temperature of 150 ° in the relaxed state with 7% shrinkage. attempt

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No. Finally, 5, "refers to the heat setting of pretreated lasers from Yersuch No. 5 in Table 2, namely at a Temperature of 170 ° in the relaxed state and with free shrinkage.

Table 3

Properties of the fibers

Verse,:

Degree of tensile elongation Young shrinkage Crystal strength (^) for module ₂ at 15O ⁰ O! Isation (g / d) Breakage kg / mm (#)

2 0.49 4.3 42 460 0 4th 0.48 4.6 35 510 0 5 0.51 5.0 27 590 0

According to the invention, one can make excellent heat shrinkable Polyethylene oxybenzoate fiber as a raw material for manufacturing create fluffy materials such as yarns, woven or knitted fabrics Heat shrinkability from such polymers as polyvinyl chloride or other Yinyl polymers and copolymers generated, which form little or no crystals However, when these fibers were heated, a very intense shrinkage took place with deterioration of valuable properties.

A method has now been found to make polyethylene oxybenzoate fibers to produce, which not only have a high heat shrinkability, but also after shrinking retain their excellent properties. Here one makes the characteristic property of the polyethyleneoxybenzoate take advantage of the rate of crystallization

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"is very low at temperatures below 100 °, but still very much at! temperatures above 120 °. You can now use polyethylene oxybenzoate fibers orientate them strongly, if they are in an essentially uncrystallized state "at as low a level as possible Temperature, e.g. below 70 °, in the available stretching range stretched. The fibers drawn in this way shrink noticeably, while maintaining their excellent properties, if they are heated at a temperature at which the molecules of polyethylene oxybenzoate crystallize very rapidly the orientation is also fixed »

According to the facts described above, if polyethylene oxybenzoate fibers high heat shrinkability are required, the stretching processes at the lowest possible temperature down to 70 ° and at the highest possible voltage, so that the birefringence index is above 0.07 and the degree of crystallization can be kept below Oj25 "

Table 4 below shows some test results for comparison. The Boh fibers used in experiments 1-5 are not oriented and have not crystallized out} they have a birefringence index C ^ - _n ) ^of 0 »Q1 ¹ ^ Hd a degree of crystallization (x) of 0.03ο

Try uo. 1 refers to raw fibers that are stored at a! Temperature of 80 ° and under a tension of 10 kg / mm in one Ratio of 4> 7 were stretched, test ITo 2 on Eoh fibera, which were stretched at a temperature of 85 ° under a tension of 12 kg / mm in a ratio of 4.8

Trial No. 3 refers to fibers that are initially used in a

temperature of 75 ° and under a tension of 7 kg / mm ²

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were stretched at a ratio of 3.4 and then further at a temperature of 80 ° with a stretching ratio of 1.2, corresponding to an overall ratio of 3.4 χ 1.2 = around 4.1. In experiment Ho. 4, the fibers were drawn in a ratio of 3.4 yr, at a temperature of 80 ° and under tension of 2.9 kg / mm, alao outside the available stretch range. When trying HfO. 5 the pasers in a ratio of 4.4 at a temperature of 80 ° and under tension stretched by 7 kg / mm.

As can be seen from Table 4, the fibers obtained in Experiments 1-3 have both a sufficiently low value of ¹¹ X * and a sufficiently high value of Δ that they have high heat-shrinkability and excellent tensile strength after shrinkage «The fiber according to experiment No. 4 has too low a value of Δ _η and thus too low a tensile strength after shrinking. 5 has too high a value of ^lf x ° and thus a low heat shrinkage capacity

Table 4 Properties of the fibers

_No * tensile ⁿ x ^M Λ shrinkage tensile strength strength ⁿ when heated when heated

(g / d) at 150 ° (#) at 150 ^σ (g / d)

1 5.1 0.15 0.118 45 3.1 2 0.18 0.135 38 5.5 3 5.2 0.21 0.160 , 50 3.8 4th 3.5 .0.09 0.055 40 1.3 j 4.2 0.33 0.118 13th 3.6

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ι η ό a ο ό υ

The invention is illustrated by the following examples

without the invention being restricted by them "

Lasers produced in the melt spinning process from polyethylene © xyfeenzoate with a birefringence (^ _n ) of 0.01 and a degree of crystallization (x) of 0.05 were stretched in a stretching ratio of 4s5 in water of 85 ° under a tension of 8 kg / mm and then heat-treated under the same voltage, in an air oven at a temperature of 180 ° _? while they were held at their length for 2 minutes § finally ax were heat-cured in a period of 20 seconds at an iD temperature of 160 ° and in the unaplasted state, with nan a. Shrinkage of 8 i » allowed. The resulting lasers had a tensile strength of 5» 0 g / ä ₉ an elongation at break of 47 $ 9 a Xoung's modulus of 480 kg / mm and a heat shrinkage of 0 $ at 150 °

Example '2. - '''~"^;:' ^: ■ ■""^;"

The same lasers as in Example 1 were first stretched in a stretching ratio of 4? 4 in water at 80 ° and under a "tension of 7 kg / mm" and then in contact with a hot plate at 130 ° C. in an additional ratio of 1 ₉ 2 stretching corresponding to a -.-. Total stretching ratio 4 _S 4-2C 1? 2 - ^; rdv 5 »3 ·" - The · so stretched solvents were in

heat-treated, heated oven bsi. the temperature of .180 fei ^ aegö ^ ä »-

& © *, under such tension that its length is I. Maintained for a minute © Dmn. were the lasers at one

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Temperature of 150 ° heat-hardened for 1 minute, in the relaxed state so that they could freely change their length. The resulting fibers had tensile strength of 5 | 2 g / d, an elongation "at break of 38 #, a Young's modulus of 550 kg / mm and a heat shrinkage of 0 # at 150 °.

Example 3 » -

Fibers spun from polyethylene oxybenzoate in a melt process with a birefringence of 0.005 and a degree of crystallization of 0.05 were initially in contact with a Heating plate stretched at a temperature of 100 ° and under a tension of 11 kg / mm in a ratio of 4 »5 and then again in contact with a hot plate "at one temperature of 160 ° additionally stretched in a ratio of 1.4, corresponding to a total stretch ratio of 4 »5 times 1.4 = 6.3 | it included a heat treatment in an air heated Oven at a temperature of 160 °, keeping them under such a tension that they are in the Seconds of heat treatment maintained their length,) Finally the fibers were heat-cured in the course of 1 minute at a temperature of 160 °, in the relaxed state, so that they could freely change their length

The resulting fibers had a tensile strength of 5.4 g / d, an elongation at break of $ 22, a Young's Module of 620 kg / mm and a heat shrinkage of 0 ^ 150 °.

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Example 4.-

The same, ®u lasers as in Example 1 - were sunäehst in contact with a hot plate of 90 ° SJemperatiar under a tension of 6 kg / mm in a ratio of Asu and then additionally by blowing you water vapor τοη 120 ° temperature in a ratio tos , 1,2 entangled »entBgreohe & cL ein Gesaints'fereclc ¥ sri», ältr-.ia tob 4jO χ 1,2 s 4s8 ₃ Me on this W ^ ise "/ stretched fibers were in Terlaui τοη 30 securiflen" at an 'E temperature τοη 170 ° i ^ ämebshandelt, and zs ^ ar under such tension., da3 si © Sieja ^ m 3 fe creamed · Sohließlioh were the fibers Ία aatspannten state in? 3rlauf of 30 seconds at eiiiffii / Ssiaperatur of 170 ° Mtzegöbä.t ^etc. tet ₃ where they sound

The resulting fibers had a tensile strength of $ 3 8 g / d, an elongation at break of $ 42, a Xoung's modulus of 430 kg / mm and a worm shrinkage of 0 f> at

Fibers made from bolyethylene oxybenzoate with a birefringence of 0.015 and a degree of crystallization of 0.10, produced in a spin-spinning furnace, were stretched 3 in hot water at 85 ° under a tension of 10 kg / mm 2 in a ratio of 4 to 8 ? asem mixes for 1 minute in a steam chamber of 150 ° C heat-treated, but under such tension that they retained their length. Finally, the fibers were heated over 3 minutes at a temperature of 160 ° hard et, in the relaxed state®, in order to be able to change its length freely

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The resulting fibers had a tensile strength of 4 »7 g / yd, an elongation at break of 40 $, a Young's modulus of 460 kg / yd, and a heat shrinkage of 0 fe at 150 °.

Belapiel 6. -

The same fibers as in Example 1 were pre-drawn in hot water of 75 under a tension of 15 kg / mm in a ratio of 4f8. The resulting fibers had a birefringence of 0.120, a degree of crystallization of 0.20, a tensile strength of 5 »5 g / d and an elongation at break of 28 ». When heated in an air-heated oven for 5 minutes, the fibers shrank by 28 #, the tensile strength fell to 4 »0 g / d, while the elongation at break increased to 40 #.

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Claims (1)

1435830 Patent claims [1. ^ Process for the production of threads and fibers Polyethylene oxybenzoate, characterized in that in the melt spinning process produced fibers of polyethylene oxybenzoate composed of molecules which are essentially neither oriented, are still crystallized, "at an Eempe— temperature of 70 - 120 ° and under a voltage of over 3 kg / mm are stretched in a ratio of over 2.5 2. Process for the production of threads and fibers from polyethylene oxybenzoate, characterized in that fibers produced in the melt spinning process from polyethylene oxybenzoate, which are composed of molecules _y which are essentially neither oriented nor crystallized, at a temperature of 70 - 120 ° and under a tension of over 3 kg / mm in a ratio of over 2? 5, whereupon the drawn fibers are subjected to a heat treatment at a temperature of 120 200 °, under a tension that causes the fibers to shrink less than 5 1 ° permitted; j 3 * Method of making threads and fibers from Polyethylene oxybenzoate, characterized in that in the melt spinning process, produced fibers of polyethylene oxybenzoate, which are composed of molecules which are essentially neither oriented, are still crystallized, at an oil temperature are stretched from 70 - 120 ° and under a tension of over 3 kg / mm in a ratio of over 2.5, whereupon the drawn fibers at a! temperature of 120 - 909605/0798 tt \ i -J ww 200 ° subjected to a heat treatment » ^; and awar Tint he is of such a tension that no change in fiber length is possible .J 4. A process for the production of threads and fibers from polyethylene oxybenzoate, characterized in that fibers produced in the melt-spinning process from polyethylene oxybenzoate, which are zueammenetzt from molecules which are essentially neither oriented nor crystallized, at a temperature of 70 - 120 and under a tension of over 3 kg / mm in a ratio of over 2.5, whereupon the drawn fibers at a temperature of. 120 200 ° a heat treatment under such a tension that the fibers are stretched so far that no break occurs »j 5 · Process for the production of threads and fibers from polyethylene-hydroxybenzoate, characterized in that fibers produced in the melt-spinning process from polyethyleu-orybeazoet, which are composed of molecules which are essentially neither oriented nor crystallized out, at a temperature of 70 - 120 ° and under a tension of over 3 kg / mm in a ratio of over 2.5, whereupon the drawn fibers are subjected to a heat treatment at a temperature of approx a shrinkage of less than 5 i »allowed and finally the heat-treated, stretched parsers are at a temperature of 120 - 200 ° will be heat-cured, namely in the relaxed state so that it can shrink by more than 5 ^, j \ 909805/0798 6 »Process for the production of τοη threads and fibers from Eolyaethylene-oayeeazoat, characterized in that fibers produced in the Sehmelzspinn process from Polyethyleii-Gxygleichat, which are composed of molecules which are neither oriented nor crystallized in the we @ borrowed, with a structure τοη 70 - 120 ° and under a tension of 3 kg / mm in an iron ratio iroa over 2 »5 ferstreo & t whereupon the extended fibers are subjected to a heat treatment at a temperature of 120-200 °, namely but a tension so high that none Aena@TV.ng the fiber length possible is j, and ßöfaXießlieh. the heat-resistant, pre-stretched fibers have a 3? emperat-ar τοη 120 - 200 ° Mtssegenäriet. who »the ₉ imfl sww was in a relaxed state, so that they know -together than 5 $ shrink , 7. A process for preparing filaments and you lasers made of polyethylene-ozybenzoatj gekennzeicimat characterized in that n _f Bchmelz "spinnverfaiiren erzeiigte fibers Polyaethyl © * -> 03 ^" benz at © _t are susammengesetzt from molecules that oriented -wesentlichen neither still from & rlst & llisiert siad | at a temperature τοη 70 - 120 ° and under a tension τοη t over 3 kg / mm in a Yerhaltnia τοη over 2> 5 Terstreekt * whereupon the '/ extended fibers are subjected to a heat treatment at a temperature τοπ 120 200? and under such tension that the fibers are stretched without breaking, and finally the heat-treated, stretched fibers are hardened at a temperature of 120-200 °, and in the relaxed state, so let them be more than $ 5 can shrink. 909SÖS / O798 8. Process for the production of threads and pasers Polyethylene oxybenzoate, characterized in that in the melt spinning process produced fibers from polyethylene oxybenzoate, the Composed of molecules, walcha essentially neither oriented, still crystallized, at one temperature are stretched from 70 - 120 ° and under a tension of over 3 kg / mm in a ratio of over 2.5, whereupon the pre-stretched fibers at a temperature of 120-200 ° be subjected to a heat treatment under such tension that the fibers are less than 5 $ can shrink, and finally the heat-treated, stretched fibers are cured at a temperature of 120 - 200 ° be, ^ and in a relaxed state, so that the pa- so that their length can change unhindered. j 9 · Process for the production of threads and pasers from Polyethylene ozybenzoate, characterized in that in the 8c! Imelz ~ spinning process produced lasers from PolyaethylöH-oicybenzoat, the are composed of molecules which are essentially neither oriented nor denatured, at a temperature of 70 - 120 ° and stretched under a tension of over 3 kg / mm in a ratio of over 2.5, whereupon the drawn fibers are subjected to a heat treatment at a temperature of 120 200 °, namely under such a tension that no change in the length of the pair is possible is, and finally the heat-treated, stretched fibers are heat-hardened at a temperature of 120 - 200 °, in the relaxed state ·, eo iafi the lasern their length iä «rt can change · 10. A process for the production of threads and fibers from Polyaethylene-oxybenzcat, characterized in that produced in the melt-spinning process fibers from Polyaethylene-osybenzoat, which are composed of molecules which. are essentially neither oriented nor austeristallized, at a temperature of 70 - 120 ^G and under a tension τοπ over 3 kg / mm in a ratio of over 2 $ 5 Yerstrselrt, whereupon the stretched fibers to an temperature of τοπ 120 200 ° Heat treatment will be prohibited, namely under such a tension that the Fssera is distended without breaking ₉ and finally the heat-treated _P stretched laser-n are heat-hardened at a temperature of 120-200, and between relaxed states _f so that the fibers change their length unhindered ls method of making threads and fibers ien oscybenzoat, characterized in that in the melt spinning process produced fibers from Polyaethylsn-oxybeazoat that are composed of molecules that are substantially neither _f oriented nor crystallized eind, at a temperature of 70-120 ° and under a ipannung of more than 3 kg / mm in a ratio of about 2 _S 5 are knitted hand then subsequently at a temperature tob 90 - 180 ° are drawn to a Sesamtstreckverhältsiia of more than 3 * 5 · j 12 »Process for the production of T & äen uM. Fibers made of polyethylene ~ _»y o23rbenzcat characterized in that Fssesr generated in SchmelzspinnYerfahresi *. from lolysethylene-o ^ bsnzoate, which are made up of molecules "susemmengsgetst: s ± ^ & _f welohe Im. temperature of 70-120 ° and under a tension of more than 3 kg / mm in a ratio of more than 2.5 and then subsequently stretched at a temperature of 90-180 ° to a straight stretching ratio of more than 3.5 whereupon the drawn fibers are "subjected to a heat treatment at a temperature of 120-200 °, under such tension" that the lasers can shrink by less than 5 $ . 13 · Process for the production of threads and lasers from Polyae ^ hylen-oxybenzoat, characterized in that in the Schiaelzspinnverfahren produced lasers from polyethylene oxybenzoate, the are composed of molecules which are essentially neither oriented nor crystallized at a temperature from 70 - 120 ° as well as under a tension of over 3 kg / mm are drawn in a ratio of over 2.5 and then afterwards at a temperature of 90 - 180 ° a total stretching ratio of more than 3.5, whereupon the warped lasers at a temperature of 120 200 ° be subjected to a heat treatment under such a voltage that no change in the laser length is possible is borrowed. 14 · Process for the manufacture of load and lasers from Polyethylene oxybenzoate, characterized in that in the melt pinning process produced lasers from polyethylene oxybenzoate, the are composed of molecules which are essentially neither oriented nor crystallized at one temperature from 70 - 120 ° and under a tension of over 3 kg / mm in a ratio of over 2.5 909805/0798 ■ and then afterwards at a temperature of 90 - 180 ° are stretched to a total stretching ratio of over 3 »5, whereupon the stretched fibers at a temperature of 120 200 ° subjected to a heat treatment, under such tension that the fibers are stretched without a break occurs. 15 · Process for the production of threads and pasers from Polyethylene oxybenzoate, characterized in that in the melt spinning process produced fibers of polyethylene oxybenzoate, which are composed of molecules which are essentially neither oriented, are still crystallized, at a temperature of 70 - 120 ° and under a tension of over 3 kg / mm are drawn in a ratio of over 2.5 and then subsequently stretched at a temperature of 90 - 180 ° to a total stretching ratio of over 3.5, whereupon the drawn fibers are subjected to a heat treatment at a temperature of 120 200 °, namely under such a tension that the fibers can shrink less than 5 #, and finally the heat-treated, stretched fibers are heat-cured at a temperature of 120-200 °, in the relaxed state, so that they turn can shrink more than $ 5 " 16. Process for the production of threads and stripes Polyethylene oxybenzoate, characterized in that in the melt spinning process produced fibers of polyethylene oxybenzoate, which are composed of molecules which are essentially neither oriented, are still crystallized, at a temperature of 70 - 120 ° and under a tension of over 909 805/0798 3 kg / mm are drawn in a ratio of over 2.5 and then subsequently drawn at a temperature of 90-180 ° to a total draw ratio of over 3 * 5, whereupon the drawn fibers are subjected to a heat treatment at a temperature of 120,200 , namely under such a tension that no change in fiber length is possible, and finally the heat-treated, drawn fibers are hardened at a temperature of 120-200 ° hi> t ze, in the relaxed state, so that they are by more than 5 i »can shrink · 17 · Process for the production of threads and fibers from polyethylene oxybenzoate, characterized in that fibers produced in the melt spinning process from polyethylene oxybenzoate, which are composed of molecules which are essentially neither oriented nor crystallized, at a temperature of 70 - 120 ° and are stretched under a tension of over 3 kg / mm in a ratio of over 2.5 and then subsequently drawn at a temperature of 90-180 ° to a total draw ratio of over 3> 5, whereupon the drawn fibers at a temperature of 120 200 ° an If & wß treatment under such a tension that the fibers are stretched without breaking, and finally the heat-treated, stretched fibers are heat-cured at a temperature of 120-200 °, in the relaxed Conditions so that they can shrink by more than 5 1 * " 18 · Method of making threads unö fibers from Polyethylene oxybenzoate, characterized in that in the Sehmelz- 909605/0798 spinning process produced fibers from polyethylene oxybenzoate, which are composed of molecules which are essentially neither oriented nor crystallized, at a temperature of 70-120 and under a tension of over 3 kg / mm in a ratio of over 2 _? 5 be 180 ° au a G-es.-a ^ TAE creckverhältnis of about 3 to 5 stretched _Ρ whereupon the scattered fibers at a temperature VQN 120 200 ° heat treatment under WOULD CHOOSE - are stretched, and then subsequently in eir ^ r temperature of _90? under such a tension that the lasers can shrink by less than 5 $ , and finally the heat-treated _s drawn fibers are heat-cured at a temperature of 120-200 °, in the relaxed state, so that the fibers are unrestricted in their length can change. 19. A process for the production of threads and fibers from polyethylene oxybenzoate, characterized in that in the melt spinning process produced fibers of polyethylene oxybenzoate, which are composed of molecules which are essentially neither oriented, are still crystallized, at a temperature of 70 - 120 ° and under a tension of over 3 kg / mm are drawn in a ratio of over 2.5 and then subsequently stretched at a temperature of 90 - 180 ° to a total stretching ratio of over 3 »5, whereupon the drawn fibers are subjected to a heat treatment at a temperature of 120-200 °, namely under such a tension that no change in the fiber length is possible, UEd finally the heat-treated, drawn Fibers are heat-cured at a temperature of 120 - 200 °, 909805/0798 C f • in the relaxed state, so that the pasers can change their length unhindered ₀ Process for the production of threads and filaments from polyethylene oxybenzoate, characterized in that filaments produced in the melt spinning process from polyethylene oxybenzoate, which are composed of molecules which are essentially neither oriented nor crystallized, at a temperature of 70 - 120 ° and stretched under a tension of over 3 kg / mm in a ratio of over 2.5 and then subsequently stretched at a temperature of 90-180 ° to a total draw ratio of over 3 »5, whereupon the drawn fibers at one temperature be subjected to a heat treatment of 120-200 °, under such a tension that the fibers are stretched without breaking occurring, and finally the heat-treated, drawn fibers are heat-cured at a temperature of 120-200 °, namely in relaxed states so that the pasers can change their length unhindered _e 21 · Process for making excellent heat shrinkable Pädens and Pasern made of Polyaethylem-oxybenzoat, thereby characterized in that pasers produced in the melt spinning process of polyethylene oxybenzoate, which are composed of molecules which are essentially neither oriented nor crystallized are at a temperature of 70 - 120 ° and under a tension of over 3 kg / mm in a ratio of over 2.5 are drawn to produce fibers drawn in this way with a birefringence index of over 0.07 and a degree of crystallization to get below 0.25. 909 fi05 / 0798 22β Täden and lasern on the Polyethylzwoxybenzoat, produced according to the "method according to claim 21, characterized in that they have a high heat shrinkability of over 15 ° when they are heated to 150 °. 909805/0798