DE1669456A1 - Plastic yarn - Google Patents

Description

Plastic garη Priority: October 11, 1965 - England

The invention relates to elastomeric plastic yarns such as British patents 870 292, 962 186, US Pat. No. 3,097,192 and Belgian patents 637,982 and 659,935 and French patent 1,368,153.

The manufacture and processing of synthetic elastomeric yarns often gives rise to difficulties arising from the adhesiveness of the Surface of this lady originate. This adhesiveness can do that Difficult or impossible to remove yarn from a package

909842/1668

make and argibfc also a high Relbungukoeffiaientsn between the yarn and any surfaces, such as guides, through which the Öarn is routed during processing. It 1st It has already been proposed to sprinkle the yarn with an inert powder 211, such as talc, to solve these problems, before it is wound up

fe One property of some elastomeric yarns is that they stick and jumping (stlck-and-jump), which comes to light when nothing else Twine is twisted on top of each other * With the expression '' wrap on top of each other " should be meant that a piece of thread over an Oarnwiokel from the same yarn with such a wrap angle is wound that the drawn yarn is a quarter of the circumference of the winding touched.

It has been found that the above problems can be solved if a thin coating is applied to bare elastomeric yarns eer polymer is applied, with the properties of the elastomeric Yarns are practically unaffected, but there is no problem associated with adhesiveness occur more and the elastomeric yarn an increased slipperiness having.

According to the invention, a synthetic elastomeric yarn, which consists of at least one elastic thread to reduce the surface friction with a synthetic, fiber-forming not elastomeric polymer coated. Preferably are the coated threads in the sucked state.

^s 909842/1668 BAD original

The term "elastomeric" is intended to mean a rubbery property so that such threads will regain their original length when repeatedly stretched to 150 Ji or more of their original length the origins! uho contract length.

Polymers for producing synthetic elastomeric yarns are known per se. Segmentary condensation polymers are of particular interest, for example those polymers which are formed by a reaction between a polyester (such as a mixed polyester), a diol or λ diamine and an aromatic or aliphatic diisocyanate, which latter can be used in molar excess. The polymer substance used for the coating can be selected from a wide variety of known types of polymer, ζ.Β «from FoIyamiden, polyureas, polyesters, polysulfonamides and polyurethanes, which are hereinafter referred to as hard polymers for the sake of simplicity. These polymers are preferably produced on the running yarn surface by reaction between the polymer-forming reactants, which are dissolved in essentially non-organic solvents, the polymer-forming reaction then being the same as the reaction in the process known as chemical layer polymerisation (see Journal of polymer Science, Volume Ί0, pages 289- ¹ jio) in general, a method is for commercial reasons desirable to seigtj rapid Oberflächenpolymerb.lldungsreakticn, and although suitable monomers which rapidly reagieren-- at room temperature are known, eg USA patent E7CG 617, some examples are given below. Piir κΛ>; -. poXyRiiirbilc! end ReaM'ionsp & rtner · should be Löcjc-v; üufc .. the ( ¹ Eu 1> * \ ituuikt elastomeric yarn

909842/1668 bath

do not adversely affect or destroy. For the durability and strength of the top coat on the surface areas of the elastomeric yarns that are to be coated, it is beneficial if they are in the swollen state, for example through the action of solvents, since the swelling facilitates the anchoring of the polymer used for the coating . The solvent, which contains the polymer-P-forming reactant first applied to surface areas of the elastomeric yarn, can, for example, cause this swelling effect. The selection of the best solvent for any particular combination of an elastomer and the polymer-forming ingredients often depends on experimentation, since different types of solvents usually act to different degrees on different elastomers. Some examples of suitable solvents are given below , which are used with particular elastomers and coating polymers. The elastomeric yarns can be manufactured by heat-treating, dry-spinning or melt-spinning . The method of the invention can best be carried out in such a way that the surface coating reaction is carried out on the yarn before it is wound up .

A simple and effective way of applying the polymer-forming constituents to a running elastomeric thread is to bring the thread into contact with a solution at one end of a capillary, the other end of which is connected to a reservoir for this solution of constant Ni

- The browning of the thread with the solution at the end of the capillary is facilitated by the fact that a groove is formed in the part forming the capillary, such as a glass rod, at the point where the capillary ends. The thread running along in this groove is guided laterally, and the solution emerging from the capillary is most likely to reach all of the running thread. The solution of a second polymer-forming reaction partner can be applied to λ the thread via a second capillary.

The yarns produced can be used as substitutes, e.g. for the usual wrapped elastomeric yarns and core type yarns. They can have a small thread thickness and preferably form mere elastomeric games because of the reduced adhesion and easier handling in processing plants. The surface adhesion and friction of polymer-coated elastomers Yarns according to the invention are generally lower than Dan mi.b talc besfcuul-t.ftn tiastomeric yarns. "

The yarns produced according to the invention allow 3ich Wirkwjiiviu and Strickt.?."-en process, about au elastic Stockings.

It has ciöh harausgesv-il.l & j that even a very thin OberfIS-ohSiib-riSi'-aioiitMnf; me; a hard polyr «· ^ *, corresponding to a

It is more desirable, as the properties of yarns can be impaired as a result, and some coatings will then peel off.

The elastomeric yarn can be before or after surface coating be drawn, and in some cases it has been observed that elastomeric yarns which, after coating with a hard polymer were drawn, puckered spontaneously when the drawing tension was released. Such spontaneous curling was also observed in undrawn yarn is observed, the hard polymer coatings are burning on a straight spun elastomerea yarn between that Spinning and the first winding were applied.

A finishing agent or other surface that was applied to the elastomeric yarn prior to coating according to the invention should be removed from the surface of the elastomeric yarn before the polymer-forming reaction takes place, as these substances cause the formation of a firmly adhering material. Polymer layer could affect -.

The surface layer of ^ -Inam Pcl; ':. r.rid was a di-acid chloride (dissolved in an ockentir * solvent) with a Dlamjn (geiöi c- Ln i / ujsü slnex * Substfitiz zur SilureanΓη-- ·! ■ »: ■ ■: *. (? ,, t. WXiΛ <\ λ: ■> .. ÖS Diamiit) gyr- '" ¹ M j- ^ :::: w: i. \ - ^; .;,;. ^ Äüt

rc "· lv.-al; tion organiscliön ·) 1n presence -jot λϊ, oööj. · About

BAD ORIGfNAL

triethylenediamine, hexamethylenediamine, P-xylyloldlamine, M-xylyloldiamine and 1,4-bis (aminomethyl) cyclohexane). The latter are closed prefer because they react the fastest.

Surfaces made of polysulfonamides can pass through Prepare reactions equivalent to those of the polyamide-forming reactions mentioned above, using Dieulfonylchloride replace the dicarboxylic acid chlorides.

A surface coating of polyurea can be produced by converting a diisocyanate (preferably an aliphatic diisocyanate3, since it is made from aromatic diisocyanates Polyureas produced generally discolor greatly under the action of light) with a diamine, the diisocyanate is dissolved in an organic solvent and the diamine in water. Suitable diisocyanates are tetramethylene diisocyanate, Hexamethylene diisocyanate and P-xylyloldiisocyanate.

Surface layers made of polyester can be produced by converting disulfide chlorides, such as those listed above are, with dihydroxybenzenes, such as hydroquinone or bisphenol A in the presence of an acid-absorbing agent, such as sodium hydroxide .

A suitable solvent for acid chlorides is methylene chloride, which causes swelling of the surface of polyester urethane elastomers causes. Methylene chloride is also a suitable solvent for aliphatic diisocyanates when polyester acid

909842/1668

ι · ■ *

thanelastomers are to be coated with polyureas. When using chloroform it was found that this causes greater swelling of the polyester urethane elastomer with a consequent greater change in the elastic properties of the elastomer and a thicker deposit of the hard polymer.

In the following, the invention is additionally described with the aid of examples.

Example 1.

2708 parts of a hydroxyl-terminated mixed polyester, which is made from ethylene glycol and ljI-dihydroxyl-ajS-dimethylpropane in a molar ratio of 7: 3 and from adipic acid, and which has a molecular weight of 1760, was made with 388 parts 1,4-butanedol Thoroughly mixed and heated to 100 ° C in one atmosphere . heated dry nitrogen. Then 970 parts of hexamethylene! ils ο ay ana t the melt added over two hours and this was constantly stirred. During this period the temperature was gradually increased from 100 to 190 ° C. After adding 96 % of the diisocyanate, the temperature had risen to 160.degree. C. and the remaining k% of the diisocyanate were added very slowly during the further rise in temperature to 190.degree. The total amount of diisocyanate added was 98.5 % of the stoichiometric amount calculated on the basis of the total hydroxy equivalents of the polyester and butanediol.

909842/1668

BATH ORIGINAL

The polyester urethane had a viscosity of 3500 poise at 170 ° C. and was drawn from the polymerization vessel to form a tape 3 mm thick, which was solidified in cold water. This tape was dried and cut into pieces 3 .mu.m long. * The polyester urethane polymer had a viscosity of 0.89 and a VICAT softening temperature of 143 ° C.

The polyester urethane was at 19CrC using a spinneret 5 holes spun from the melt at a pressure of about 20 kg / cm. The extruder speed was 1> 7 g / min, and the winding speed 70 m / min. The threads were converging so that they were about 60 cm behind the spinneret • formed in yarn. The yarn came in a gut at the end of a Kapillarrohreβ led, whose capillary diameter was 1 mn. The capillary became a 0.1 molar solution of sebacyl chloride in MethyM ^ Q & Lqrld from a container with constant level (• fithrt · Pat darri then came through a second groove at the end of f of a strip of laplllar cane about 30 cm behind the first was disordered and that from a second storage

constant level an aqueous solution of 0.25 '} / MO ^ tQ hexamethylenediamine and 0.5 moles of sodium carbonate per liter

Hi ■ '·? Η! · 1% "The Qarn then came to a small gusset • Ineft Vtesohlin ^ unf! Angle of 90 ° and was on its hori-

talen $ ahj * mX% e ^ a running solution of 0.5 iaolar aqueous saslgafture washed and wound up.

The coated elastomeric fiber has an opaque appearance, while

rend the untreated elastomeric yarn was shiny and transparent. The coated yarn could be drawn on top of each other) without the occurrence of cracking effects as with untreated elastomer em yarn.

The mechanical properties of the untreated and the coated elastomeric yarn are listed in Table 1 below.

Table I. Recovery from 100 % stretch 71 1.97 polyamide coated
Elastomer properties bare
Elastomer a) Elastic elongation (50 95 Friction measurement on polish
tem chromium (at (JO 135 72 408 Denier number 370 b) Work stretch (30 1.25 0.37 Firmness (g.p.d.) 0.34 on "Sintox ¹¹ -
Ceramic (AT (JO
ί 676 Elongation at break (JO 810 Ψ 95 70 53 0.89 47 0.89

The elastic recovery was pc with one Inst "-! Determined voltmeter was a 5 cm long Oarmvfeück r.It a Geschwln-.

909842/1668 ***> ORiGINAL

speed of 100% per minute stretched by 100% and then released at a rate of 100% per minute, whereby the elastic recovery was · expressed as a percentage of permanent linear with respect to the ursprungliche length.

The work recovery has been determined using an Instron Spannungemessers and represents the ratio of the work that is released back of a stretched yarn "to the sum stretching needed is work, and gen under the same Bedlngun- J as for determining the elastic Recreation. It is calculated from the ratio of the area under the stress- strain curve during a stretch cycle when contracting to the area under the tension-strain curve when stretching the thread3 and is expressed in%.

The friction measurements were carried out in the following manner. The yarn was passed around a cylindrical pin with a low Umschlingungswlnkel of about 30 ° and at a linear velocity of 5 m / Hin * The tensions in the yarn during the "running onto the pin and at the expiration of the same were determined by conventional voltage measuring means. The tension in the yarn as it runs onto the pin was adjusted to about 1 gram weight. the cylindrical pin is arranged at the upper end of a vertical lever which is provided with a converter, which allows the measurement of Hebeldlfferens in a horizontal direction. the preceding calibration, The displacement of the Hebsl enabled the tension in the yarn running off the cone to be closed, and from this the percentage increase in tension when rotating the cone Ca.T) and

-... · ..,, ", i 909842/1668 BAD QWGWAL

calculate the dynamic coefficient of friction Ut). Two different cylindrical pins were used in the tests, one with a polished chrome surface and the other with an ^M Sintox ^w surface. Sintox is a trade name for a ceramic material.

Example 2.

A polyester urethane polymer was prepared and, as in P Example 1 described, spun from the melt, the following reactants from a grooved Capillary were applied to the yarn, as also in Example 1 described 1st. The first capillary became a 1 molar solution of hexymethylene diisocyanate in methylene chloride upset. A 1 molar solution of hexamethylenediamine in water was applied from the second capillary. The yarn was finally washed with a 0.5 molar aqueous acetic acid solution and wound up.

With the higher concentrations of the reactants compared to Example 1, a thicker coating was formed on the yarn, from which something could be rubbed off, but the upper part as a whole was still in order and usable afterwards. Samples of the bare straight spun elastomeric yarn and the polymer coated elastomeric yarn were rewound and commercially available spinning equipment is used. The samples were then stretched to three times their length, wherein It turned out that the polyurea-coated yarn curled spontaneously, i.e. behaved like pair-

909842/1668

8AD ORIGINAL

wisely assembled threads. Table II below shows Surface friction measurements showing that the coated yarn has a lower surface friction than the bare elastomeric yarn, regardless of the spin finish used.

Table II. Yarn samples Frictional animals on / * chrome / * "Sintox" 1.25 ^ T % 1.97 135 not drawn without ready to spin 72 0.81 0.52 editing 1.05 25th 1.05 with iPolyurea be
layered yarn without
Spinning web processing 42 0.33 58 0.22 with ready-to-spin bear
processing 58 - 10 0.62 with polyurea be
layered yarn with
Ready-to-spin
tion 15th 31 drawn without ready-to-spin bear
processing -

Yarn coated with poly urea Ready-to-spin processing

10

o, 22

80 * 842/1661

Example 3 »

It was prepared according to Example 1 and polyurethane polymer spun a screw extruder from the melt and wound up at a speed of 700 m / min. It was 1 molar Solutions of hexamethylene diisocyanate prepared in two different solvents and on two different yarn samples applied, with a 1 molar solution of hexamethylenediamine in water being applied in each case. The solutions were applied as in Example 1. The Yarn samples are washed with acetic acid applied by a roller and then a commercially available spin finish is carried out. The properties of the finished yarns are given in Table III compared to the properties of an as-spun elastomeric yarn that is not coated with polyurea had been.

Table III.

Yarn properties biofies solution for HMDI 3 Elastomer CH ₂ Cl ₂ CHCl Denier number 128 127 160 Breaking load (g) 77.7 75 262 64 Firmness (g.p.d.) 0.607 0.590 Elongation at break (Ϊ) 390 396 136 Recovery from 100 % stretch 909 8 A 2/1668

BATH ORIGINAL

Elaetlache recovery (%) 90 90 90 Work recovery {%) 46 45 42

It can be seen from Table III that the yarn which had been treated with a LtJ treatment of hexaraethylene dilsocyanate in Hethylenohlorld has main properties which do not differ significantly from those of the mere elastomeric yarn. However, μ It seems that chloroform because it is a stronger swelling agent for Polyesterurethanelastomere, a greater penetration of OberfläQhenbereichs the elastomeric yarn is given by hexamethylene diisocyanate, so that a thicker coating was formed of hard polyurea. This increased the yarn modulus and reduced extensibility considerably. The yarn treated with hexamethylene diisocyanate in chloroform puckered spontaneously as it was unwound from the bobbin.

This example shows that can be achieved by using different solvents or mixtures i thereof, different coatings.

The two coated yarns exhibited significantly improved frictional properties compared to the uncoated elastomeric Yarn on.

809842/1668

Example 4.

This example is intended to show that an elastomeric yarn can be coated with a polymeric material during the unwinding process.

According to Example 1, an unfinished, bare polyurite-elastomer yarn was produced and unwound at 70 m / min it was with a 1 molar solution of hexamethylene disosyanate ) treated in methylene chloride and then with a 1 molar aqueous solution of hexamethylenediamine, both solutions with the one described in Example 1, provided with a groove Capillary have been treated. The yarn was then washed with running water while crossing a roller and wound up at a speed of 80 m / min. It became a second one untreated elastomeric yarn unwound in a similar catfish, but only washed with water. The properties of the coated and uncoated yarns are shown in Table XV.

Table IV. Yarn properties bare polyaoid coating Elastomer tetes elastomer

Denier number 138 139 Firmness (g.p.d.) 0.732 O, 818 Elongation at break (%) 327 308 Recovery from 100 % stretch Elastic color (%) η 95 / 1 868 ¹¹ 51 BAD OFUGtNAL

(on polished chrome

(AT (%) 122 23

_{Friction values} \ &"Slnfcox" ^ ⁸ ' ^O '<7

(Δϊ (Jt) 31 17.5

(/ f 0.62 0.37

Although the dloke of the oversize is very small, as is the case

slight difference in denier can be seen, and though the main mechanical properties due to the overxug changed only slightly, resulted in a remarkable one

Reduction of surface friction. · Example 5.

There were 72.3 parts of a hydroxyl-terminated mixed polyester * made of ethylene glycol uni. 1,3-Diliydroxyl-2,2-Dimethyl-Propane in a molar ratio of 7: 3 prepared and adipic acid with a molecular weight of 2028 thoroughly kit 14.2 parts, cls-but ~ 2-en-l, Ji-diol mixed and to 100 ° C under a dry nitrogen atmosphere. 33.3 parts of hexaethylene isosyanate were added over the course of one hour with continuous stirring, and the procedure was otherwise essentially as described in Example 1. The final polymerization temperature was 195 ° C. The channel was subjected to a vacuum for 5 minutes in order to remove glass bubbles. Stirring was then stopped and the device was brought to atmospheric pressure by introducing dry nitrogen. The stirrer was removed from the

909842/1868

Melt pulled out and the polymer cooled. The polymerisation tube was smashed in liquid nitrogen and that Polymer separated from the glass. The frozen polymer had a viscosity of 1.54 (in o-chlorophenol as a 0.5 * solution (percentages by weight) and a VICAT softening point of 112 ° C.

The polymer was spun from the melt at 210 ° C through a 5 hole spinneret using a pressure of st 27atÜ (400 pel). The extrusion speed was 1.6 g / min, and the winding speed 70 m / min.

On the threads running convergent below the spinneret A 0.5 molar solution of hexamethylene isocyanate in carbon tetrachloride was added to a first capillary provided with a groove applied, then from a second, grooved capillary a 0.5 molar aqueous solution of hexamethylenediamine and then a 0.5 molar acetic acid washing solution and a commercially available spinning finish. The monomer solutions were the capillaries, as described in Example 1, supplied.

In contrast to the yarns coated with polyurea the elastomeric yarn without a polymer coating, which only had a conventional spin finish, can only be unwound with great difficulty.

The yarn properties of polyurea coated and of bare elastomeric yarns are given in Table V.

BAD 309842/1668

Table V.

1 .04 271 95 54 27
O .54 27
O .54

sheer polyamidbe yarn properties elastomeric yarns layered yarns

Strength (g.p.d.) 0.706

Elongation at break (Ji) 3l4 recovery from 100 t elongation

Elastic recovery (Ji) 97 Work rest (Jt) 63

(on polished

(Chrome

U> T (Jt) 234

Surface friction {M 2.84

in arbitrary (on "Sintox" units (ceramics

(^ T (Ji) 60

(yM 1.08

The measured properties show the effectiveness of the coating with a hard polymer material, the surface adhesion and the yarn-on-yarn friction being significantly reduced.

Example 6.

1830 parts of a hydroxyl group-ended, made of ethylene glycol and propylene glycol in a molar ratio of 7: 3 and adipic acid with a molecular weight of 1,830 with 800 parts of bis (p-Ieosyanat-FhenyD-Methane at 80 ° C «white Hours! «? ■ argeeetzfc. are you reading Voppolyme? " 18O files 1.4-

ι ^: i; κ £ ϊ ί

Butanediol added and the mixture vigorously for a few minutes stirred, whereupon they poured into an open, shallow mold Stainless steel is poured (depth 2 to 4 mm) and stored at 80 ° C for 20 hours. The finished polymer has a VICAT softening point of 191 ° C and was at 200 ° C and one

2 ft

Pressure of 40 kg / cm (CiOO PsI) at a temperature of 200 C. spun from the melt with a spinneret with 5 holes, as described in the previous examples.

The threads running convergent below the spinneret became out a first capillary a 0.5 molar solution from Sebasylchlorld added in methylene chloride and from a "wide capillary an aqueous solution with 0.5 mol per liter of hexamethylenediamine and 0.5 Moles per liter of sodium carbonate. The yarn coated with polyamide was finally treated with a 0.5 molar aqueous acetic acid solution washed and given a conventional spin finish. A sample of the elastomeric yarn was not coated with polyamide, but rather. change only with the finishing agent. This sample was in contrast Adhesive to the polyamide-coated yarn and let you see deal with great difficulty.

Table VI shows the properties of polyamide coated yarn compared to the properties of uncoated yarns that were only dusted with talc during spinning to prevent the threads from bunching up on the bobbin.

ORIGfNAL 909842/1668

Table VI. properties

■ It Talku * bestflubt polyaaldbe-

sohlohtet

Firmness (g.p.d.) 0.825 0.660 Elongation at break (%) 760 7 * 8 Recovery from 100 % stretch BlastIsohe recovery (t) 98 97 Work rest (K) 84 86

The elastic properties of the polysjsldbesehlohteten and the uncut yarns are very similar and first «are through does not affect the coating. On the other hand, the surface friction of elastomeric yarns is due to the polyanide coating substantially reduced.

Example 7

A sample of an elastomeric yarn was made according to Example 6 under spun under the conditions described there and on the running de yarn below the spinneret polymer-forming reaction substances applied according to example 2. The polyurea formed on the surface of the yarn in this way reduced the adhesion considerably, whereas untreated yarn was very adhesive and had to be dusted with talcum during spinning. to report caking on the wrap. The own

983S42 / 1S68

comparison of yarns coated with polyurea to untreated yarn that has only been dusted with talc are listed in Table VII.

Table VII.

polyamide coating dusted with talc · Yarn properties elastomeric yarn

Strength (gpd) 0.825 0.830

Elongation at Break (Sf) 760 812 Recovery from 100 % elongation

Elastic recovery (X) 98 98

Work recovery (JO 84 86

Example 8.

It was N-alkylated compound polyamide elastomer prepared as follows:

958 parts of N, N »-Dlisobutylhexamethylenediamine, 808 parts of sebacic acid, 160 parts of 11-aminoundecanoic acid, 2712 parts of caprolactam, 120 parts of distilled water, 2.4 parts of orthophosphoric acid and 0.8 part of" Sllicolaps "antifoam were poured into a steam-heated autoclave Stainless steel given, tier e & i capacity of 14 liters (3 gallons) had ₉ and in the-era usn-

909842/1668

The autoclave was heated to boiling temperature, purged with steam to drive out the air, and held tight for 50 minutes. The autoclave was heated for a further 50 minutes until it finally reached a temperature of 260 ° C. and a pressure of i <. had reached atü (18o psi). The pressure was then reduced to atmospheric pressure over 50 minutes while the temperature rose to 290 ° C. The temperature was then held at this value for ^{1 JO minutes.} The pressure above the melt was then slowly reduced until a pressure of 1 mm had been reached after 65 minutes. This pressure was maintained for 20 minutes, after which the molten polymer was extruded into a tape under the pressure of a nitrogen atmosphere, squeezed and cut, and then dried.

The polymer had the following properties:

AEG, g / 10 ⁶ g. 73.7 IV = 0.87

CEG, g / 10 ⁶ g. 17 SP = li0 °,

where I.V. is the viscosity and S.P. the softening point according to VICAT mean, where that value is taken for the temperature at which the penetration speed, as with a Penetration meters essentially similar to that of Edgar and Ellery in J.C.S. described model is determined, a maximum achieved.

The polymer was extruded through a 5-hole spinneret at a temperature of 193 ° C. under a pressure of 20 atmospheres (300 psi)

909842/1668 BAD OR "G" * AL

spun in the melt. As in Example VI, solutions of sebacyl chloride in methylene chloride and hexamethylenediamine in water were applied to the yarn running below the spinneret on the spun threads, and the polyamide-coated yarn was then washed and given a spin finish. A sample of yarn to which no polyamide coating had been applied was found to adhere extremely well and would not unwind from its roll. The polyamide coating reduced the tendency to stick and the surface friction of the yarn to such a level as is achieved by dusting with talc without the elastic properties of the yarn being impaired.

Example 9.

The elastomer according to Example 8 was prepared as described in this example, spun and solutions of diisocyanate and diamine in accordance with Example 2 of capillaries applied to the yarn, wit in the previous examples is described. The polyurea coated yarn was then washed and a spin finish applied. The polyurea coating in turn reduced the tendency of the yarn to adhere and reduced the surface friction of the yarn to such a level as can be achieved by dusting with talcum powder, the elastic properties of the yarn not being impaired by the polyurea coating, as can be seen from Table VIII.

ORIQINAL 909842/1668

- 25 - 1669456 • Table VIII. properties just yarn, old
Talc dusted multi-soled
tet yarn Firmness (g.p.d.) 0.195 0.407 Elongation at break (JO 5 * 8 595 Recovery from 100 % stretch Elast 1 see recovery (Jf) 9 * 94 Work recovery (JO 62 63

Claims (1)

l.J Synthetic elastomeric yarn with at least one elastomeric thread, characterized in that the thread is coated with a synthetic, fiber-forming (fiber-forming) non-elastomeric polymer lit. \ 2. Yarn according to claim 1, characterized in that it is formed as a reaction product of a polyester or mixed polyester, a diol or diamine and an aromatic or aliphatic DiisoByanatB, and that the non-elastomeric polymer forms a polyamide, polyester, polyurea, polysulfonamide or polyurethane » 3 · The method for producing a yarn according to claim 1 or 2, it is known that at least one uncoated elastomeric thread is continuously filled with polymer-forming Reactant is treated, which is a non-elastomeric Form a polymer coating on the surface of the elastomeric thread. 4. The method according to claim 3, characterized in that the polymer-forming reaction partner solutions are used, which are applied to the uncoated elastomers one after the other Thread are applied. 5. The method according to claim ö ₉ daduresh characterized in that the polymer-forming reactant applied to the polymer-forming reactant is a swelling agent as the solvent for the zuerafc 9098 ^ 2/1668 medium is used for the surface of the thread. 6 .. The method according to claim * J or 5, characterized in that the solutions of the polymer-forming reaction irtner can be applied to the thread by means of capillary tubes, which in connection with the storage containers contained in the solutions stand. 7. The method according to claim 4 to 6, characterized in ™ notes that the non-elastomeric polymer layer is produced by the reactions of solutions of a dicarboxylic acid chloride is formed in the presence of an acid acceptor. 8. The method according to claim k to 6, characterized in that the non-elastomeric polymer layer is formed by the reaction of solutions of a diisocyanate and tines diamines. 9. ο Method according to claims k to 6, characterized in that the non-elastomeric polymer layer is formed by the reaction of solutions of a disulphonyl chloride in the presence of an acid-absorbing agent. 10. The method according to claim 4 to 6, characterized in that the non-elastomeric polymer layer through the reaction of solutions of a carboxylic acid chloride and is formed by dihydroxylbeiizole in the presence of an acid absorbing agent, MTqtTANWttft ML-WO.H.FIHCKE DIK-INO.H. 909842/1668 ww * ^e