DE1469134A1 - Polyamide thread and method of making the same - Google Patents

Description

f H 69 134.0 White documents

1.1 · DTJ PORt IS WMOimS ABS ΟΟΜΡΛΙΙ 10th "ad Market Streets, Wileington" Delaware 19 898, V.St.A ₀

Polyeel thread and method of making the same

The invention relates to polyamide threads, in particular for tire cord, and a method of manufacturing the same.

threads bsv. dam «made of polyamides, such as Polyhexylnethylenadipinsttureaaid and poly-fi-oaproneäureaaid, are used for many textile and technical sveoke, but because of them are relative low porosity, their low eIaatieity module and their strong length for other important ones inwendungsnirepks only usable to a limited extent · Ss is 3.B. known, Aase these properties directly from the appearance of the "flat ones." Steven "contribute to the processing traditionally Polyiaidge * ne ro cord reinforcements for bowling occurs. One has

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also recognized »that this obstacle to the effective use of polyamide yarns in Reifenoord could essentially be eliminated by a substantial reduction in the depth of the flat areas. A prevention of the depth of the flat spots of about 5 to 5.3 «a with polyfiexa-ethylene adipic acid anide cord and about 6.4 mm with polydaproic acid anide cord to a value of less than 4.1 an with an 8.50 ζ 14" clay ( For help, the customs are the usual dimension information in Germany as well) would provide a behavior that shares peace if no other characteristics such as the strength and elongation at break of the cords occur.

The invention is based on the object of polyamide threads Available sa β te, Ilen, the improved forabeataaAlgkelt, an increased modulus of elasticity and a reduced leaching apt when they are processed into tire cord, and that means a much lower level of clothing for flat eighth holes "

The subject of the invention is a Polvavddfaden, in particular for Reifenoord, which is known for being aas a Geadsoh obtained from a Miachsohajelae by faeerbildendea Molecular weight consists of two different, non-isomorphic polyanides, the first of which is one Temperature T έ 120 ° 0 and 88 to 50 weight

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prosent de · Genieohee makes up, while the eweit a binary temperature I fc 140 ° 0 and a base point of veniger ale 350 ° 0 and 12 to 50 percent by weight of the Gesisohea matters.

Pie threads are manufactured according to the invention by mixing the two polyamides, bringing the Gemisoh to its base point and then to a temperature in the range τοη 1 ⁰ C over

* 250

/ Λ

its Scheel point raised to 350 ° C, 0 to 120f ^ l 30 Hin.

/ Λ *

holds at this temperature, where T means the side of the valley, and then the MieohechaelBe spun

Torcugly, the feet are laid down

As a result of an ABidaustausohea, which at the Sohaeleteaperaturen takes place »the Mieoheohaelae alndeetene bub was allowed to part from a HookBlsohpolyserlsat exist, in which the Segeente each Polyamide component has a relatively high molecular weight to have.

fg rewards the temperature (above 0 ° C) at which a mazisal loss occurs on seohanic work, sine bigeneohaft, which is related to the molecular and the molecular arrangement. The way in which this temperature is related to this maximum course is in the work "You Physics of High Polymers" by A.8. asstaversan and f. Sohwarsl, Volume IT ₉

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Springer-Verlag, Berlin 1956, Chapter I, described. The determinations are made at 0.1 Hz and a voltage amplitude of - 0.8 $>. tang S of the publication corresponds to the T value in the sense used here.

T stands for the freezing temperature familiar to folymer experts

door, i.e. the temperature at which the polyamide is removed from the glass-like or brittle state to liquid or chewy-like State passes. At this temperature there is a change in the slope of the curve, which is the dependence dee The modulus of elasticity as a function of temperature, and also the curve showing the dependence of the coefficient of expansion on represents the temperature.

It has been recognized (Flory, "Principles of Polymer Chemistry", Cornell University Press, Ithaca, Hew York, 1953 "S * 53, and Toboleky, "Properties and Structure of Polymers," John Wiley and Sons, Inc., Hew York, 1960, pp. 69 and 70) that the numerical The value of the freezing temperature T strongly depends on the determination method depends. The values given here were determined using the above-mentioned work "Die Physik der Hoohpolymeren".

The characteristic value S ("set") of a cord is a visooelaetieohe Property that can be related to a flat spot on a tire and is determined after a test,

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which the formation of flat spots naohahmo Thereby the Changes in the length of two identical cords under the influence of tension and / or temperature differences are determined, that mimic the changes in the deformed and undeformed parts of a tire. You algebraic difference between the changes in length is equal to the percentage expressed S-value.

For the determination, a thread bundle of 840 den (pre-stretched) and twisted with 472 Z twists / m t, doubled and twisted with 472 S-twists / m. The plied cord is at a temperature that is 30 ° C or more below the thread end melting point, 60 seconds below one Tension from 0.9 to 1.8 kg hot drawn. The cords will in the test two-chunk on a low relative Peuohte (< 10 J *) held.

The determination of the S-value that a cord develops when it is subjected to a special temperature and tension cycle, soles as follows:

1. The cord is relaxed for 10 minutes at 160 ° C (Naohahmung

tire vulcanization),
2ο you fasten two cords in the test device, apply a load of 0.8 g / den and hold at 77 ° C for 1 hour (where the cord is preconditioned).

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3. The cord is brought to 25 ° C and at least 30 minutes kept at 0.6 g / den.

4. The two cords are measured (L _& and L ^); the values represent the initial lengths for both cords.

5. «on brings the load to 0.8 g / den, the Oord to 77 ° C and holds these conditions for 30 minutes.

6. The load on the cord b is changed to 0.25 g / den τ er. The cords are brewed at 25 ° C. for 7 · 15 minutes.

6 "After 5 minutes, the load on the cord a is 0.6 g / den

changed.
9 · The cord a is measured for 30 minutes.

10. Immediately thereafter, the load on the cord b increases 0.6 g / den changed and the length of the cord after exactly 1 minute begins (L ^ 1 min,).

11. Duron comparison of the initial and strap lengths, the genunterohiede Δΐ _& and Δΐ ^ are calculated (both in percent); the algebraic difference between the two is equal to the 8th of the various points in time as a percentage

Dl · Depth of flat spot on an 8.50 χ 14 "tire (the ■ aadüMle radial distance away from the normal circumference of a case » fens and the geonetrical tendon that forms a flat spot » printed out in units τοη 0.025 ms) can be used as a » 8-yert according to the equation

Depth of the flat spot «85 S + 69 calculate.

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The first polyamide of the mixture is a polyamide with good preparability, strength and toughness, which is suitable for most uses; it is referred to as polyamide A in the following. The polyamide A has an I of 120 ° C or less and usually an S value of 1.20 ^ or more. The second polyamide of the mixture has at least one aromatic or cycloaliphatic ring in the skeleton of at least one of its repeating units. This polyamide is therefore structurally stiff and, due to its high melt viscosity, more difficult to process than a homo fiber and has a T of HO ⁰ C or more and an S value of 1.00 % or less; it is referred to as polyamide B in the following. When the polyamides A and B are melt blended and processed into tire cord by the method described below, the cord has an S value of less than 1.07 f>, which corresponds to a depth of the flat of less than 4 mm. In addition, significant improvements in other properties of the thread and cord are achieved.

You polyamides A have one of the repeating units

0 R ₁ R ₃ 0 R ₉ R ₅ BT ¹¹ IO -CCDCCHCECH-

It Il

R ₂ R ₄ R ₆

or

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Rii ^R 12 ^R 13 ®
-HCPCC-

I I

^H 14 ^R 15
in which R ₁ to R _{15 are} hydrogen atoms or alkyl radicals with 1 to 4 carbon atoms and J) and E are divalent aliphatic, cycloaliphatic or unsubstituted aromatic radicals (when J) is a divalent, unsubstituted, aromatic or cyoloaliphatic radical , £ must be a divalent aliphatic residue, and vice versa) and V is a divalent aliphatic residue.

Bas polyamide A can, for example, be polytetramethylene suberone acid amide, Polyhexamethylene suberonic acid amide, polyhexamethylene adipic acid amide, Polyhexamethyleneebaoine acid amide, poly-6-oaprone acid amide, Poly-n-heptylamide, polyoaprylic acid amide, polypelargonic acid amide, Polydeoanoic acid amide, polyundeoanoic acid amide, Poly-a-xylylene adipic acid amide, poly-n-xylylene pimellene acid amide, Poly-m-xylylenesuberone acid aniide, poly-m-xylylene azelaic acid aaid or poly-n-xylyleneebaolne acid amide. Bs can be a Hoeopolyaoid, a statistically disordered misoh polyamide or ELooknieoh polyamide or a polyamide mixture.

Poly-m-xylylene adipic anide differs somewhat from the other members of group A, because its T_ is less than about 120 ° C and its 8-value about 1.00 ^. Se can therefore be called

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Bomofiber used to manufacture a tire that üütemäealg in particular on the training of flaoher positions Orenefall is “if ea is in the form of a Mlsohsohmelse-DaBe the invention is used, you get a better behavior in view of the formation of flaky spots »

You polyamides B have dig repeating unit

0OH H

Ν I »I t

• -O-G-U-l-Z-I-

on, in which Q and I are divalent aliphatic ^, aromatic or oyoloaliphatisohe mean best (with the exception that not both may be divalent allphatistic residues). For practical The polyamide B is also intended to have a Bloek-Sohael point of less than 350 ° 0, since above this temperature a strong breakdown occurs, which prevents the S ohm © la spinning.

The polyaaid B ktaan sB made from-PSienvlendiaaln and adipic acid, pimelic acid or ßuberone acid, from 1,3-bianinooyolohexane (Ieonerengeaieoh) and adipic acid, from p-phenylenedianine and aselaic acid or sebacic acid, from bis-U-aainoaeoyclohexyl) , sB 80 1 » ο ie, tear, 20 it OiS ₉ OiB) and OuI or isophthalic acid, from Bie- (4-ejBinooyolohexylj-nethan (solid Isoaerengemieoh, bB 50 to 55 £ trans, trans, 45 bit 50 Jt οis, trans) and aeelainic acid or

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Sebacic acid, from be- (4-aminophenyl) "i-ethane and adipic acid, from 4,6-DlJWthyl-m-phenylenedianiine and suberonic acid, aselaic acid or sebacic acid, from 2,4-dimethyl-m-phenylenediamine and 4,6-dimethyl-m ~ pheriylenediaain (e.g. 50/50) on the one hand and Suberonic acid, aselaic acid or sebacic acid on the other hand » from 1,3-dianinopropane and isophthalic acid, from 1,4-diaminobutane and isophthalic acid, from 1,5 ~ diaaJLnopentane and leophthalic acid, from 1,6-diaminohexane and isophthalic acid, from 2-Kethylhezaaethylendiaain and terephthalic acid, from e-lylylenediaain and isophthalic acid or from hexahydro-p-xylylenediamine (Ieoaerengeoisoh) and adipic acid or isophthalic acid can be obtained. Bs can be a homopoly / aaid, a crystallisable, statistlsoh Disordered Kleoh Polyanide or BlookBisohpolyaaid or be a Polyaaidgeaieoh.

The lfieohsohaelsen derive from the invention as well as from them Spun threads contain about 12 to 50 parts B and about 83 up to 50 parts A.

It is assumed that the exceptional persistence the cord from the threads according to the invention results from this, that their crystallini did normally riel more developed can be compared to statistically disordered Hleohpoljraalden the smooth components and assemblies aög-1st. There are certain coablations of the polyaaids A anyway

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and B, in which the components come together to form a

Hiechkrietalle from the melt auekristallieieran.

Such components show how statistically disordered mixed polyamides, the properties of isomorphic polyamides that the relationship between melting point and composition Curve has no clear eutectic. Such isomorphic components prevent the formation of the maxial ones Crystallinity of the threads produced from the mixed melt at the 7th most> temperatures.

When choosing suitable pairs of polyamides A and B is therefore as an additional factor to consider their propensity for isomorphism. This inclination can in many cases from the Dimensions of the unit cell, radiographically marked, be predicted. It's a simple estimate of this slope is possible by comparing the number of chain atoms in the repeating unit of each homopolyamide. at Equal numbers are likely to crystallize together, and these polyamides are for the purposes of the invention not so cheap.

Pur Polyamide A of the type of Polyhexamethylenadipineäureamids that auskrietallisieren from the melt in the hexagonal system, and then at a lower temperature (etna 14O ⁰ C)

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· 1χι · Conversion into the trikllne S / etea3 suffers · * · mm · Iaa polyamide 8 ait de «hexagonal system to be r.ioht-oeorphic.

Am nooh finer XriterluB for a good combination ·! » ftua 4 and B lit di · Seaiehung srwieohen άβι »ßonaelapunkt and the Bveaaaen- • etittng etatietieoh disordered Mieohpolyaaide fm A and B. When dl · Mieofeeoheelijwinks« di «a« r Misuhpoljraeide traaentlioa under the BoluMlioa! the β inaeinen KoaponenttfH deep, • lad 4 and B aieat leo "crph and" share infol £ "deeeen" l & e Koebinaticn

Am furthermore i irforfternie feeatent in it, acted out A and B form β Molekttlargevslolit Ci.l · oberaalb 10,000) said "·, although the Holetoilargewionte of the" iaeelkoaponenten aioht i "er in the fair-educating Bereloh" u lie-sen brew. Dta höohete, me processing Praktieoh eögliohe Molecular weight of each loaponente usually gives that beeten Faaereigtneohafton "

The MieoheoheelB · is produced, lüde »» to the polyaeids A and B sitdat in enormous amounts, since «β aindeetena (4 B _A ² -f 24 β _Β ² - 2, + 6) felle dee folyaaids B on 100 fur · * The Geaieohee are omitted, with 8 _A and 8 _ß the B-lte of the Polyaaids A biw «B. If the Polyaaid B is in a smaller amount than the above minimum percentage, it is usually an 8- \ fert of less than 1 , 07 or a fief

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of the flat position less than 4 na with a 8.50 ι 14 "aid, which was produced under the usual conditions In the oily equation, the amount 4 8 _A ² + 24 Sj ² t »2, if you are polyamides A and B not homogeneous, and ui θ ια, if there is a tendency towards zeomorphism. Si® suläeaige maximum amount of the polyamide · 3 is 50 #.

In order to obtain a homogeneous miso, the aemieoh is raised to the Sohmel point for a short period of time, so that only the lowest possible amidaueoh iwi "without" the polyamides A and B takes place and a maximum blook length is maintained. These conditions are achieved by 0 to 120f * l erhitit the ge "ohmoliene mixture of 30 minutes to a temperature, but not above 350 ° 0 is at least 1 ⁰ C above the Sohmelipunkt of Genisohee. Yorsugsweiee the temperature is 5 to 50 ° 0 above the Bohmela point de · Gfemisohes, and the Brhitsungseeit is

/ i \ 2 = 25O
0 to 60Γwl 30 minutes. T means the temperature at which the Oemiβoh is kept, in 9rad Oelsius. The above expression for the upper Qvn * 9 applies to polyamides of normal fiber-forming molecular weight. Fixed acid groups or water catalyze the exchange of amides, so that when larger amounts are present, one reacts lone "participants with the shorter

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other periods of time should work. In a similar catfish ”fortune Catalysts (e.g. for polyamidation) the exchange speed to increase and inhibitors to decrease them.

To achieve the desired thread properties is an effective one Mixing of polyamides A and B is necessary. Mixing can be done mechanically. You Misohsohmelze will then thread spun, and these are scattered.

You polyamides A and B can e.g. in the form of τοη flakes, melts or solutions are mixed. Mixing of flakes or melts is preferred. You mixed melt can naoh that Technique of lass, dry or preferably sohmeltspinning are processed.

The S-value and the behavior in relation to the formation of shallow Make can sometimes by a Ho oh tempera door treatment or Annealing (Example 21) can be improved; the necessary duration or temperature of the treatment can usually be determined by treatment with a plasticizer such as steam or a swelling agent.

Mixtures of polyhexaoethyleneadiplneamide are preferred and polyhexaaethylenieophthalic acid amide, which is no more than £ 50 of the latter included. The nature of this mixture as bloom isoh polyamide is determined by fractional extraction

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Low concentrations of acidic acid were found. physikaliaohea Gemiechaue the two polyamides reads eioh as a result of their inter-affiliated partnerships in chemistry Separate formic acid and waaaer (dae aliphatic polyamide let la Aneieeneäure su 76 to 76 f &, das aroaatieche ea 96 bie 98 $ löelioh). Am ßatietiaoh disordered a Miaohpolyaeid let Soluble old HexaethyleniecphthaleSureanid, while Block-Klcohpolyaaide Bit animals exhibit Itueliohkeitexi, where see You gtaouee Terhalten after the BlookgrSeoe riohtet.

It has been verified ₍ that 82 liquid aqueous aqueous acid is an excellent solution to remove the millionths from the two polyamides, which are good threads, as well as those who do not produce good threads Let duroh Aaidauatauaoh and / or lowera initiala Holelcularewioht the length of a BlÖofce dee Folyhezanethyleniaophthaleäureamida ao far prevents that aaa aie no longer effective enough aind to stabilize the cords against the formation of flat spots in the tire The threads of the invention consist of FolyhezaBethylenadipineäureaaid and no longer ale 50 % Polyhexanethylenieophthalaäureainid in 82 ftigar Aaeiaenaäure bu aindeatene about 12 + unlöalioh. Part of this part includes the pure Polyhexanethyleni-adipinettor · - amidat (stronger than amid)

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etiach disordered) polyhexamethylene adipamide-polyhexamethylene isophthalic acid amide block.

On the basis of the rate constants for the amide exchange obtained in the investigation of model compounds, it can be concluded that the polyhexamethylene isophthalic acid amide component of the block polyamides obtained by exchanging the desired strength has an average length of bond ens 10 polyhexamethylene isophthalic acid amide units. Dias is the shortest unit for getting effective results; longer blocks are preferred. You can also take a stronger amide exchange work when hoöhviscose (langkettlge) find Hexamethylenisophthalsäureamid polyamides use or when the Polyhexamethylenisophthalsäureamid in high per Bentanteilen is used unless remain in unlöslioh 82 £ formic acid only at least about 12.

The polyamide threads according to the invention are not only suitable for the production of tire board with high heat resistance, but also to reinforce fire hoses and straps and ribbons, cheesecloths, and teas-made yarn in general as well as due to their high modulus of elasticity for textile yarn. Solohe yarns can be in the form of threads, cables or staple fibers au carpets, pile goods, twill, taffeta and woven and knitted fabrics of all kinds can be processed.

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The usual additives for polyamides, such as matting agents (cf. USA patent 2 205 722), oxidation retarders (cf. USA patent pens 2 510 777) or light stabilizers (see USA patent pens 2 887 462).

Pie compositions are in the following examples »if not stated otherwise, expressed in weight present. she logarlthnisohe Viecoeitäteeahl is in a solution of 0.5 g Polyamide determined in 100 ml m-cresol

The formation of the flat spots is planted in the laboratory by inflating the 8.50 χ H "test tire to 1 1/2 attt, heated to 77 ° 0 and then loaded with 492.2 kg until it has cooled down to room temperature. Pie radial deformation in millimeters is the length of the flat spot.

The threads are made from a liner made of various polyamides with lower freezing temperatures (T) . Typical blending temperatures for such polyamides are as follows:

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Tabel

polyamide

* v °° I. 80 II 75 III 115

Polyhexamethylene adipamide Polyoaproic acid amide Poly-m-xylene adipic aniide Poly-2-methyl-hexamethylene-terephthal-

säureaaid IY 146

Poly-2,4 / 4,6-dimethyl-m-phenylene-

sebaoic acid amide Y 180

Polyamide made from bis (4-aminooyolohexyl) methane (solid mixture of isomers) and azelaic acid YI 175

Poly-m-phenylene adipic acid amd YII 160 Polyhexamethylene isophthalic acid amide YIII 142

* Abbreviations used in the following examples.

example 1

Hooks made of polyamide I (logarithmic number 1.1) become old Plooken made of polyamide YII (logarithmic yisoosity number 0.46) mixed in a weight ratio of 65:35. Dae Geeieoh is molten in a 13 mm snow press and fed to a spinneret. The temperature in the press increases in the direction of flow, and at the discharge end it has Kleohsohaelze a temperature of 297 ° C. The dwell time at 297 ° 0 is 5 minutes. A 5-pad bundle is made from the mixture

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del tone 25Q the total titer he can enjoy, since you can use a stick from 80 ° C and a plate (tandem arrangement) from 180 ° C to dae. 5.5 times veretreokt.

Beetint strength, elongation at break, modulus of elasticity, the salt elongation in the relaxed state and the S-value and determine the depth of the flat spot. The tensile strength properties are measured in a conventional manner using the Inetron test device. Elongation includes not only the immediate stretch at the given load (in the first half minute), but also the stretch that occurs during the best of the 30 minute periods. Before the test, the samples are relaxed for 46 hours at 55 1 · relative Peuohte and 25 ° C. The samples are then relaxed for 5 minutes at the stated temperatures. The results are given in Table II grass seeds with corresponding values for a mixture of polyamides I and YII in a ratio of 90:10, for the two individual polyamides and for the statistically disordered polyamide (which is available from polyamide mixtures with similar proportions in the both contain one polyamide, but are kept at a high temperature until the statistical disorder occurs) _e

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The working conditions of Examples 1 _{V of} the four comparison tests indicated therein and of the following Example 2 for 14 and the results obtained are summarized in Table II. Examples 2 to 14 are carried out according to the Terfahron of Example 1 with the proviso that dl · flakes in the examples? and 6 in a Preaeopinnvorrlontung and in Examples 7 and β in a 2.5 on extrusion on ^ nstthiEolsen.

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Be i JL τ > 1 e 1 e 15 to ί '1

Example 10 are jades of different colors spun and entangled **. Difficulty reading and result

Kind and polyamide a b e 1 1 e III Polyamide B 65 yrs lot A. Type and quantity S-Vert, Jt "egg-
game 85 yr II £ value, Jt 35 Jt VIII 0.57 15th 70 yrs I. 2.1 15 Jt Poly-
tetramethylene
isophthalic acid
amide 16 74 yrs III 1.7 30 Jt VIII 0.57 17th 75 yrs I. 1.0 26 Jt) 18th 75 yrs I. 1.7 25 Jt ♦♦) 19th 75 yrs I. 1.7 25 Jt · ♦ *) 20th I. 1.7 25 Jt poly- 0.48
(2-methylhexa-
ethylene tere-
phthalic acid spec. d) 21 1.7

*) Statistically disordered Mieohpolyanid

from 95 % VIII and 5 ^ I (log. TisoositySBahl 0.56)

* ·) Statistically disordered Mieohpolyanid

from 70 Jt VIII and 3Q Jt Polyheiamethylene terephthalic aoid (log. Tlsoosltätssahl 0.50)

***) Statistically disordered Mieohpolyanid

from 95 $ Polyhexanethylenieophthalsaureanid and 5i » Polyhoxanethyleneterephthaleäurenaid (log. diversity number 0.5).

23L-

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A cord is made from the threads, the S-values are determined, and determines the depth of the flat spots in the cords containing Tires. Results:

15th T a l y e 1 y. e IV example 16 17th 18th Tear strength
ability, g / den
Elastiaitü'tB-
roodul, g / den 7.0
12.0
62 4.6
12.0
79

19 20 21

5.8 4.0 12.0 12.0 10.0

60 70 S-Wezt, $ .1.07 0 _f 78 0.64 0.98 0.92 0.88 1.70

Flat spots to 2.54 5.429 3.124 3.861 3.734 3.658 5.41

The effect of isonorphism la Example 21 is beaohtenevrnrt. One should from the above oleiohung for the Sueaanenset & ung in conjunction with Table VI for these Polyaaidgemi β oh at the low content of the polyamide B of £ 15 useful behavior in terms of training flaoher Make predictions but these two polyamides tend to be sur Ioonorphy. So even at 25 pounds polyamide B are the flat ones Places about the same thin as those obtained with the polyamide A alone will. However, if one uses the cord of example 21 annealed at a constant length of 5 hours at 230 ° C, reduced eioh the S-value to about 1.00 jC.

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RD-689 / RD-699-B / P 27 419

Likewise, the effectiveness of Mieohpolyaiaidkoniponenten corresponds in the case of polyamide B, which is unique to polyamide A are isoiDorph, not expectation. For example, the increase leads the amount of hexamethylene terephthalic acid amide in the Misohpolyamide B from S> # in example 20 to 30 # in example 19 does not result in a change in the S value that goes with its very rigid structural unit, as the hexamethylene terephthalic acid amide with the polyhex & methylenadipic acid amide, the polyamide A of these examples, is isomorphic. In a similar manner, larger amounts of hezamethylene terephthalic acid amide result in the polyamide of hezamethylene isophthalic acid amide and HezamethyjLenterephthaläureamid completely isomorphic mixtures with Polyhexamethylene adlpineauramide and a corresponding reinforcement the flat spots on tires.

Examples 22-25

The example below explains that the behavior of the mixed polyamide threads When used for the purposes of the invention, it can be predicted from the solubility in formic acid. As in Example 7, polyamide threads are made from 80 Jt polyhexamethylene adipic acid amide and £ 20 polyamethylene isophthalic acid amide manufactured. One works at a temperature of the Misohsoh melt of 295 ° 0, but with different residence times. It will show the S-value and the depth of the flaky spots in this

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Cords containing 8.50 r. 14 "tires determined. The results can be found in Table V.

The determination of the fraction soluble in 82 # formic acid the threads are carried out wet as follows

A 1 g sample is dissolved in 10 ml of 98 J & ger formic acid and mix the solution thoroughly with 75 g of sand of about 0.04 mm Grain size. The mixture is dried at 35 ° C. in a vacuum. The sample is then placed in a glass column and extracted Room temperature with 82 ml of aqueous formic acid. The extraction continues until there is no more extraction. The extracted polyamide monome is determined by evaporating the solvent

label le V 24 25th example 22nd 23 13.6 21.2 Yerweilzeit, KLn. 4.7 7.1 0.94 1.05 S value, H 0.88 0.92 3,785 4.013 Flaky spots, mm 3.656 3.734 19th 15th In 82 pound ants
acid insoluble
Share, % 54 27 3.5 5.5 Amide exchange
(estimated) £ 0.8 1.2

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The sample of Example 25, which is 15 l > insoluble in 82% formic acid, is within the scope of the invention; it gives a depth of the flat spots of 4.013 mm

The lower limit for the percent concentration of polyamide B.

ρ ρ

is represented here with (4Sj + 24-Sj - 2, + 8). The values

for the factors 4s | + 2i until 4th VI gendeni until 7th value T ι until 9 16.0 ο
ISg in the examples 10 19.4 11 15.07 ibelle 12th 8.05 example 13th 21.67 1 14th 11.66 5 15th 15.65 8th 17th 21.65 21 25.42 11.82 17.12

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Claims (1)

BI. du Font de HenouTB and Coapany RD-698 / HD-699-R / P 27 419 Claims , in particular for Reifenoord, characterized in that that it is obtained from a Miechscheelee Mixture of fiber-forming molecular weight from «wet re-heating those, with each other not isomorphic polyamides consists »clay which the first has a freezing temperature T Ii 120 ° 0 and 68 to 50 percent by weight of the mixture, while that "continues a freezing temperature T ₀ . ^ 140 ° 0 and a melting point ron less than 550 ° 0 and 12 to 50 percent by weight of Geaisohee makes up. 2. Polyamide thread according to claim 1, characterized in that the «wide polyamide is an arcoatisohee polyamide. 5. Polyaaidfaden naoh claim Voder β ,? ** «! *** ^ ψΛ ^^ ί ^ ψ ^ · ^ that the« erete polyamide Polyhexa »ethylenadipin _B äure * i» id, aexaeethyleneebacineäureaerid,
aqrlylenadipineaureeaid and dae «wide Polyejttl 'adipinsttureamid, ⁰ ^ "809813/1141 M «J« 1 UntarieaMi (αλτ * ι αικ. * Ητ.γμ »· ^ Ι. U6913A / 87 419 2,4 / 4, fi · Α1 ^ fcylH ^ phaoyltn-irutoroii · »ar ··»! *, Pi ljtrina * hyla »- I * ophthel4iwrc «3» ia, PoIy ^ ttraefthylmleophtliAleluTtiari.4 odar • 1a itotlffSlrifo ra «tor4z> t-t« · Hlnohpolyaeia 1 · * »Am tine» dtr as the main kowpcmwit · · ηthill *. dfttrt.6M Otd »ch in · 1η # ·« Lörunftm.i-tttl ftbr ro * HU xmlBulloh 5 »PolyNdftftMUn nmoh Antpnioh 4, dadttroh f" k "mMichnft, dme" dme trtt "Pnlyftsld Polyhexanethy] * naaipineÄux *» nld as "Po ^ ymsld FüljhüxajitthyltnleophihalallureaBld tmd da * (Ueiioh va. ■ iadtttMi · 12 Jt in 82 Jllger wtterifer AMl'tneSiur · «nltJilioh ie *. 6. PolymrldfBdtn naoh inapruoh 5 · thereby grtaimBeiohn · *, since * · di · M «ol? jioh« * liie «in by Aitldauatauftoh antattmdtnaii Blook- ± *% _f dttftn unlOallobtr Ttil «a« KlOekta alt • lner vi-Hltren Line · τοη iilnditatan · 10 Polyh «if« «tbyl« nl »o- beeteht. 7. Polyamidfedtn neoh Aaipruoh 1 to 6 _V dadttroh galtannvvlohnat "A" ·· "r MotlBM Anldi * i" leoh toattht, since "la dor Boluwlee • loan Amidaagtaueoh tob Höchattna 5ι3 ^ arfahran has. -29- BATH ORIGINAL 809813 / me U69134 RD-698 / ÜD-699-H / P 27 419 β. The method used to produce τοη polya * idfllden according to claim 1 bio 7 »by gokennieioknet, because« «« en dl · two polya »id reraicht, the Otaleoh to« «inta Soh» elrpttnJrt tmd atom, to a · T «ap« ratur la Bereioh τοη 1 ° 0 iXbw β ^ 1η · β 8ohe # leprm \ rt Mo 350 ° 0 obtained, O bi · 1 * 0 \ ij 5Ö Kin · eof dl »e« r Τ · βρ # - rmtiir, where T dl · T «rwiilB« i «l>« d * ut · - !, tmd on it dl · KlaohaofaaelB · rereplnni. 9 "Yerfahrtn naoh Anepruoh B ₁ daduroh g" k "nnMlohn" t ₉ daae die fiden T "ratr" okt. 8098 1 3 / 1U0