EP0445708B1 - Process for the preparation of foamed fibres - Google Patents

Process for the preparation of foamed fibres Download PDF

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Publication number
EP0445708B1
EP0445708B1 EP91103256A EP91103256A EP0445708B1 EP 0445708 B1 EP0445708 B1 EP 0445708B1 EP 91103256 A EP91103256 A EP 91103256A EP 91103256 A EP91103256 A EP 91103256A EP 0445708 B1 EP0445708 B1 EP 0445708B1
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EP
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Prior art keywords
polyester
weight
polycarbonate
blowing agent
fibres
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EP91103256A
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German (de)
French (fr)
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EP0445708A3 (en
EP0445708A2 (en
Inventor
Axel Dr. Vischer
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Hoechst AG
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Hoechst AG
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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/24—Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
    • D01D5/247—Discontinuous hollow structure or microporous structure
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F1/00—General methods for the manufacture of artificial filaments or the like
    • D01F1/02—Addition of substances to the spinning solution or to the melt
    • D01F1/08—Addition of substances to the spinning solution or to the melt for forming hollow filaments
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters

Definitions

  • the invention relates to a method for producing foam threads according to the preamble of patent claim 1.
  • Foam threads i.e. Filaments or staple fibers with non-continuous voids are used as carpet fibers and also as filling fibers for blankets, pillows or as lining material for anoraks and other winter clothing.
  • One advantage of foam threads is their low density and thus the larger volume of fillers per weight. To achieve a noticeable reduction in density, about 15% void in the finished, crimped foam threads is desired. Since the void fraction decreases during stretching, the void fraction after spinning must be correspondingly larger. With regard to the curling, the cavities must be sufficiently stable against crushing.
  • a method for producing foam threads from a synthetic high polymer, a blowing agent and an additive is known from DE-ASen 25 50 080 and 25 50 081.
  • the high polymer used is polyester such as polyethylene terephthalate or polyamide such as polyamide-6 and polyamide-66.
  • a blowing agent i.e. Gas-forming substance low-boiling hydrocarbons such as pentane, hexane or the gaseous hydrocarbons such as propane or butane are mentioned at room temperature.
  • the additive is a silicone oil that is intended to improve the spinnability of the polymer, increase the running time of the spinneret and ensure an even distribution of the cavities.
  • Sodium bicarbonate and citric acid are also used as blowing agents in the production of foamed plastics, for example for structural foam molded parts, cf. e.g. EP 0 059 495 and 0 158 212.
  • the plastics mentioned include various high polymers such as polyester.
  • sodium carbonate and citric acid lead to good foaming in polyesters, it has been shown that this blowing agent damages the polyester. For example, a degradation of 0.15 intrinsic viscosity units was observed with an intrinsic viscosity of about 0.65, which corresponds to a molecular weight degradation of over 20%.
  • polycarbonate in the production of polyester threads is already known from DE-OS 27 03 051.
  • 3 to 20% by weight of a polycarbonate is added to the polyester to be spun before spinning in order to increase the water retention capacity through voids in the threads.
  • sodium bicarbonate and citric acid and polycarbonate are mixed into the polyester.
  • the addition of the polycarbonate counteracts the degradation of the melt viscosity of the polyester which would otherwise occur. This has resulted in a reduction in the molecular weight of the polyester from the feed polymer to the finished foam thread observed by less than 5%.
  • the use of sodium bicarbonate and citric acid as blowing agents has the advantage that these substances only decompose at high temperatures and are toxicologically harmless.
  • Polycarbonate also has the advantage of being toxicologically safe.
  • the blowing agent consisting of sodium bicarbonate and citric acid is expediently added in an amount of 0.15 to 0.80% by weight of the polyester and the polycarbonate in an amount of 0.5 to 2% by weight of the polyester.
  • a blowing agent composed of sodium bicarbonate and citric acid is understood to mean a largely arbitrary mixture of an alkali bicarbonate and citric acid, preferably in a weight ratio of 1: 3 to 3: 1.
  • the blowing agent content is preferably 0.15 to 0.4% by weight for polyethylene terephthalate and 0.3 to 0.6% by weight for polybutylene terephthalate.
  • a preferred polycarbonate content is in each case 1.0 to 1.5% by weight.
  • Polybutylene terephthalate has a slightly higher blowing agent and polycarbonate content than polyethylene terephthalate.
  • the content of third substances to the polyester should be as low as possible.
  • the polyester, the blowing agent and the polycarbonate are mixed in shredded form before melting and the blowing agent is added as a masterbatch, in particular in a polyolefin.
  • the three components can be mixed, for example, in the feed line to the Estruder.
  • the process according to the invention leads to easily processable foam threads (continuous filaments or staple fibers) as carpet material and also as filling material for clothing.
  • foam threads continuous filaments or staple fibers
  • Such carpet or filler fibers are produced by melt spinning and drawing in accordance with the known processes; the process parameters only have to be adjusted slightly in the course of routine tests.
  • thermal processes it should be noted that the insulating effect of the cavities also results in poorer heating of the foam threads.
  • polyethylene terephthalate granules which were dried according to customary methods, are mixed with sodium bicarbonate and citric acid in the form of blowing agent masterbatch (HOSTATRON P 1941 TM) and polycarbonate (MAKROLON 16063068 TM), extruded and spun through spinnerets with a round hole cross-section .
  • blowing agent masterbatch HOSTATRON P 1941 TM
  • MAKROLON 16063068 TM polycarbonate
  • the density of the thread is a measure of the foaming of the thread.
  • the examples show that it is only through the combination of blowing agent and polycarbonate that a significant reduction in density, i.e. a clear void fraction of the thread is achieved.
  • the starting materials are the same as in example series A and B. Instead of a spinneret with a round hole cross section, a hollow profile nozzle is used.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Artificial Filaments (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Abstract

A process for the preparation of foamed fibres from polyester, with which sodium carbonate and citric acid as propellant as well as polycarbonate are admixed before spinning, is described. The proportion of propellant is 0.15 to 0.80 per cent by weight of the polyester and the proportion of polycarbonate 0.5 to 2 per cent by weight of the polyester. As a result of the process according to the invention, foamed fibres, i.e. filaments or staple fibres having non-penetrating cavities can be prepared, which can be used, for example, as carpet fibres and filling fibres for covers and cushions or as a lining material for winter clothing.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen von Schaumfäden nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for producing foam threads according to the preamble of patent claim 1.

Schaumfäden, d.h. Filamente oder Spinnfasern mit nicht durchgehenden Hohlräumen, werden als Teppichfasern und auch als Füllfasern für Decken, Kissen oder als Futtermaterial für Anoraks und sonstige Winterbekleidung benutzt. Ein Vorteil von Schaumfäden ist ihre geringe Dichte und damit das größere Volumen der Füllstoffe pro Gewicht. Um eine merkliche Dichteverringerung zu erzielen, sind etwa 15% Hohlraum in den fertigen, gekräuselten Schaumfäden erwünscht. Da sich der Hohlraumanteil beim Strecken verringert, muß der Hohlraumanteil nach dem Erspinnen entsprechend größer sein. Im Hinblick auf das Kräuseln müssen die Hohlräume hinreichend stabil gegen Quetschung sein.Foam threads, i.e. Filaments or staple fibers with non-continuous voids are used as carpet fibers and also as filling fibers for blankets, pillows or as lining material for anoraks and other winter clothing. One advantage of foam threads is their low density and thus the larger volume of fillers per weight. To achieve a noticeable reduction in density, about 15% void in the finished, crimped foam threads is desired. Since the void fraction decreases during stretching, the void fraction after spinning must be correspondingly larger. With regard to the curling, the cavities must be sufficiently stable against crushing.

Ein Verfahren zum Herstellen von Schaumfäden aus einem synthetischen Hochpolymeren, einem Treibmittel und einem Zuschlagstoff ist aus den DE-ASen 25 50 080 und 25 50 081 bekannt. Bei diesen vorbekannten Verfahren dient als Hochpolymeres Polyester wie Polyethylenterephthalat oder Polyamid wie Polyamid-6 und Polyamid-66. Als Treibmittel, d.h. gasbildende Substanz werden niedrigsiedende Kohlenwasserstoffe wie Pentan, Hexan oder die bei Zimmertemperatur gasförmigen Kohlenwasserstoffe wie Propan oder Butan erwähnt. Der Zuschlagstoff ist ein Silikonöl, das die Verspinnbarkeit des Polymeren verbessern, die Laufzeit der Spinndüse erhöhen und eine gleichmäßige Verteilung der Hohlräume sicherstellen soll.A method for producing foam threads from a synthetic high polymer, a blowing agent and an additive is known from DE-ASen 25 50 080 and 25 50 081. In these previously known processes, the high polymer used is polyester such as polyethylene terephthalate or polyamide such as polyamide-6 and polyamide-66. As a blowing agent, i.e. Gas-forming substance low-boiling hydrocarbons such as pentane, hexane or the gaseous hydrocarbons such as propane or butane are mentioned at room temperature. The additive is a silicone oil that is intended to improve the spinnability of the polymer, increase the running time of the spinneret and ensure an even distribution of the cavities.

Aus der DL-PS 103 375 ist ein Verfahren zum Herstellen von Schaumfäden aus isotaktischem Polypropylen bekannt, bei dem als Treibmittel Natriumbicarbonat und Citronensäure und als Zuschlagstoff ebenfalls Silikonöl verwendet werden.From DL-PS 103 375 a method for producing foam threads from isotactic polypropylene is known, in which sodium bicarbonate and citric acid are used as blowing agents and silicone oil is also used as additive.

Natriumbicarbonat und Citronensäure werden als Treibmittel auch bei der Herstellung geschäumter Kunststoffe, zum Beispiel für Strukturschaum-Formteile, benutzt, vgl. z.B. EP 0 059 495 und 0 158 212. Als Kunststoffe werden dort unter anderem auch verschiedene Hochpolymeren wie Polyester erwähnt. Wenn auch Natriumcarbonat und Citronensäure bei Polyestern zu einer guten Schaumbildung führen, so hat sich jedoch gezeigt, daß dieses Treibmittel den Polyester schädigt. Es wurde zum Beispiel ein Abbau von 0,15 Intrinsic-Viskosität-Einheiten bei einer Einsatz-Intrinsic-Viskosität von ungefähr 0,65 beobachtet, was einem Abbau des Molekulargewichtes von über 20% entspricht.Sodium bicarbonate and citric acid are also used as blowing agents in the production of foamed plastics, for example for structural foam molded parts, cf. e.g. EP 0 059 495 and 0 158 212. The plastics mentioned include various high polymers such as polyester. Although sodium carbonate and citric acid lead to good foaming in polyesters, it has been shown that this blowing agent damages the polyester. For example, a degradation of 0.15 intrinsic viscosity units was observed with an intrinsic viscosity of about 0.65, which corresponds to a molecular weight degradation of over 20%.

Aufgabe der vorliegenden Erfindung ist es, ein Verfahren zum Herstellen von Schaumfäden aus einem Polyester, einem Treibmittel und einem Zuschlagstoff zur Verfügung zu stellen, das eine gute Schaumwirkung erbringt, ohne den Polyester zu schädigen.
Diese Aufgabe wird durch das im Patentanspruch 1 gekennzeichnete Verfahren gelöst.It is an object of the present invention to provide a process for producing foam threads from a polyester, a blowing agent and an additive, which produces a good foaming effect without damaging the polyester.
This object is achieved by the method characterized in claim 1.

Die Verwendung von Polycarbonat bei der Herstellung von Polyesterfäden ist bereits aus der DE-OS 27 03 051 bekannt. Bei diesem Verfahren wird dem zu verspinnenden Polyester vor dem Verspinnen 3 bis 20 Gew.-Prozent eines Polycarbonates zugemischt, um das Wasserrückhaltevermögen durch Hohlräume in den Fäden zu erhöhen.The use of polycarbonate in the production of polyester threads is already known from DE-OS 27 03 051. In this process, 3 to 20% by weight of a polycarbonate is added to the polyester to be spun before spinning in order to increase the water retention capacity through voids in the threads.

Bei dem erfindungsgemäßen Verfahren dagegen werden dem Polyester Natriumbicarbonat und Citronensäure sowie Polycarbonat zugemischt. Überraschenderweise hat sich gezeigt, daß der Zusatz des Polycarbonates dem anderenfalls eintretenden Abbau der Schmelzviskosität des Polyesters entgegenwirkt. So wurde ein Molekulargewichtsabbau des Polyesters vom Einsatzpolymer bis zum fertigen Schaumfaden von weniger als 5% beobachtet. Die Verwendung von Natriumbicarbonat und Citronensäure als Treibmittel hat den Vorteil, daß sich diese Stoffe erst bei hohen Temperaturen zersetzen und toxikologisch unbedenklich sind. Auch Polycarbonat hat den Vorzug toxikologischer Unbedenklichkeit.In the process according to the invention, however, sodium bicarbonate and citric acid and polycarbonate are mixed into the polyester. Surprisingly, it has been found that the addition of the polycarbonate counteracts the degradation of the melt viscosity of the polyester which would otherwise occur. This has resulted in a reduction in the molecular weight of the polyester from the feed polymer to the finished foam thread observed by less than 5%. The use of sodium bicarbonate and citric acid as blowing agents has the advantage that these substances only decompose at high temperatures and are toxicologically harmless. Polycarbonate also has the advantage of being toxicologically safe.

Zweckmäßigerweise wird das Treibmittel aus Natriumbicarbonat und Citronensäure in einer Menge von 0,15 bis 0,80 Gew.-Prozent des Polyesters und das Polycarbonat in einer Menge von 0,5 bis 2 Gew.-Prozent des Polyesters zugegeben.The blowing agent consisting of sodium bicarbonate and citric acid is expediently added in an amount of 0.15 to 0.80% by weight of the polyester and the polycarbonate in an amount of 0.5 to 2% by weight of the polyester.

Unter einem Treibmittel aus Natriumbicarbonat und Citronensäure wird dabei eine weitgehend beliebige Mischung eines Alkalibicarbonates und der Citronensäure verstanden, bevorzugt in einem Gewichtsverhältnis 1:3 bis 3:1.A blowing agent composed of sodium bicarbonate and citric acid is understood to mean a largely arbitrary mixture of an alkali bicarbonate and citric acid, preferably in a weight ratio of 1: 3 to 3: 1.

Vorzugsweise beträgt der Gehalt an Treibmittel 0,15 bis 0,4 Gew.-Prozent für Polyethylenterephthalat und 0,3 bis 0,6 Gew.-Prozent für Polybutylenterephthalat. Ein bevorzugter Gehalt an Polycarbonat ist jeweils 1,0 bis 1,5 Gew.-Prozent. Bei Polybutylenterephthalat liegt der notwendige Gehalt an Treibmittel und Polycarbonat etwas höher als bei Polyethylenterephtalat.The blowing agent content is preferably 0.15 to 0.4% by weight for polyethylene terephthalate and 0.3 to 0.6% by weight for polybutylene terephthalate. A preferred polycarbonate content is in each case 1.0 to 1.5% by weight. Polybutylene terephthalate has a slightly higher blowing agent and polycarbonate content than polyethylene terephthalate.

Der Gehalt an Drittsubstanzen zum Polyester sollte möglichst gering sein.The content of third substances to the polyester should be as low as possible.

In weiterer Ausgestaltung der Erfindung ist vorgesehen, daß der Polyester, das Treibmittel und das Polycarbonat vor dem Aufschmelzen in Schnitzelform gemischt werden und hierbei das Treibmittel als Masterbatch, insbesondere in einem Polyolefin, zugegeben wird. Die Mischung der drei Komponenten kann zum Beispiel in der Zuleitung zum Estruder erfolgen.In a further embodiment of the invention it is provided that the polyester, the blowing agent and the polycarbonate are mixed in shredded form before melting and the blowing agent is added as a masterbatch, in particular in a polyolefin. The three components can be mixed, for example, in the feed line to the Estruder.

Das erfindungsgemäße Verfahren führt zu gut verarbeitbaren Schaumfäden (Endlosfilamenten oder Spinnfasern) als Teppichmaterial und auch als Füllmaterial für Bekleidung. Die Herstellung derartiger Teppich- bzw. Füllfasern durch Schmelzspinnen und Verstrecken erfolgt nach den bekannten Verfahren; die Verfahrensparameter müssen nur geringfügig im Rahmen von Routineversuchen angepaßt werden. Bei der Verarbeitung der Schaumfäden mittels thermischer Prozesse ist zu beachten, daß sich die Isolierwirkung der Hohlräume auch in einer schlechteren Erwärmung der Schaumfäden auswirkt.The process according to the invention leads to easily processable foam threads (continuous filaments or staple fibers) as carpet material and also as filling material for clothing. Such carpet or filler fibers are produced by melt spinning and drawing in accordance with the known processes; the process parameters only have to be adjusted slightly in the course of routine tests. When processing the foam threads using thermal processes, it should be noted that the insulating effect of the cavities also results in poorer heating of the foam threads.

Beispielserie AExample series A

In einer Spinnanlage für Polyesterfasern wird Polyethylenterephthalat-Granulat, das nach üblichen Methoden getrocknet wurde, mit Natriumbicarbonat und Citronensäure in Form von Treibmittel-Masterbatch (HOSTATRON P 1941™) und Polycarbonat (MAKROLON 16063068™) gemischt, extrudiert und durch Spinndüsen mit rundem Lochquerschnitt versponnen. Spinnbedingungen A1 A2 A3 A4 A5 A6 Lochdurchmesser (mm) 0,8 0,8 0,8 0,8 0,8 0,8 Spinntiter (dtex) 30 30 30 30 30 30 Spinntemperatur (°C) 285 285 285 285 285 285 Abzugsgeschwindigkeit (m/min) 1000 1000 1000 1000 1000 1000 Hostatron P 1941™ (Gew % des Polyesters) - 0,6 - 0,6 0,6 1,0 Polycarbonat (Gew % des Polyesters) - - 1,0 1,0 2,0 1,0 Ergebnis Dichte des Fadens (g/cm3) 1,34 1,31 1,34 0,97 0,92 0,92 In a spinning plant for polyester fibers, polyethylene terephthalate granules, which were dried according to customary methods, are mixed with sodium bicarbonate and citric acid in the form of blowing agent masterbatch (HOSTATRON P 1941 ™) and polycarbonate (MAKROLON 16063068 ™), extruded and spun through spinnerets with a round hole cross-section . Spinning conditions A1 A2 A3 A4 A5 A6 Hole diameter (mm) 0.8 0.8 0.8 0.8 0.8 0.8 Spinning titer (dtex) 30th 30th 30th 30th 30th 30th Spinning temperature (° C) 285 285 285 285 285 285 Take-off speed (m / min) 1000 1000 1000 1000 1000 1000 Hostatron P 1941 ™ (% by weight of polyester) - 0.6 - 0.6 0.6 1.0 Polycarbonate (% by weight of polyester) - - 1.0 1.0 2.0 1.0 Result Thread density (g / cm3) 1.34 1.31 1.34 0.97 0.92 0.92

Die Dichte des Fadens ist ein Maß für das Aufschäumen des Fadens. Die Beispiele zeigen, daß erst durch die gewählte Kombination von Treibmittel und Polycarbonat eine deutliche Verringerung der Dichte, d.h. ein deutlicher Hohlraumanteil des Fadens erreicht wird.The density of the thread is a measure of the foaming of the thread. The examples show that it is only through the combination of blowing agent and polycarbonate that a significant reduction in density, i.e. a clear void fraction of the thread is achieved.

Beipielserie BExample series B

Es werden die gleichen Ausgangsstoffe wie in der Beispielserie A gewählt, wobei das Treibmittel HOSTATRON P™ 1941 in einer Menge von 0,6 Gew.-Prozent und Polycarbonat in einer Menge von 1 Gew.-Prozent des Polyesters zugemischt werden. In dieser Beispielserie werden Düsen unterschiedlicher Lochdurchmesser sowie verschiedene Spinntemperaturen und Abzugsgeschwindigkeiten untersucht. Spinnbedingungen B1 B2 B3 B4 B5 B6 Lochdurchmesser (mm) 0,4 0,8 1,0 1,2 0,8 0,8 Spinntiter (dtex) 30 30 30 30 30 21 Spinntemperatur (°C) 285 285 285 285 295 285 Abzugsgeschwindigkeit (m/min) 1000 1000 1000 1000 1000 1400 Ergebnis Dichte des Fadens (g/cm3) 1,02 0,97 0,95 0,92 0,92 0,97 The same starting materials are chosen as in example series A, the blowing agent HOSTATRON P ™ 1941 being mixed in an amount of 0.6% by weight and polycarbonate in an amount of 1% by weight of the polyester. In this example series, nozzles with different hole diameters as well as different spinning temperatures and take-off speeds are examined. Spinning conditions B1 B2 B3 B4 B5 B6 Hole diameter (mm) 0.4 0.8 1.0 1.2 0.8 0.8 Spinning titer (dtex) 30th 30th 30th 30th 30th 21 Spinning temperature (° C) 285 285 285 285 295 285 Take-off speed (m / min) 1000 1000 1000 1000 1000 1400 Result Thread density (g / cm3) 1.02 0.97 0.95 0.92 0.92 0.97

Beispielserie CExample series C

Die Ausgangsstoffe sind die gleichen wie in den Beispielserien A und B. Statt einer Spinndüse mit rundem Lochquerschnitt wird eine Hohlprofildüse verwendet. Spinnbedingungen C1 C2 Spinntiter (dtex) 17 17 Spinntemperatur (°C) 287 287 Abzugsgeschwindigkeit (m/min) 1300 1300 Hostatron P 1941™ (Gew.% des Polyesters) - 0,6 Polycarbonat (Gew.% des Polyesters) - 1,0 Ergebnis Dichte des Fadens (g/cm3) 1,10 0,80 The starting materials are the same as in example series A and B. Instead of a spinneret with a round hole cross section, a hollow profile nozzle is used. Spinning conditions C1 C2 Spinning titer (dtex) 17th 17th Spinning temperature (° C) 287 287 Take-off speed (m / min) 1300 1300 Hostatron P 1941 ™ (% by weight of the polyester) - 0.6 Polycarbonate (% by weight of the polyester) - 1.0 Result Thread density (g / cm3) 1.10 0.80

Beispielserie DExample series D

Es werden das gleiche Treibmittel und der gleiche Zuschlagstoff wie bei den vorhergehenden Serien verwendet. Statt Polyethylenterephthalat-Granulat wird jetzt jedoch Polybutylenterephthalat-Granulat verwendet. Spinnbedingungen D1 D2 D3 Lochdurchmesser (mm) 1,2 1,2 1,2 Spinntiter (dtex) 37 37 37 Spinntemperatur (°C) 267 267 267 Abzugsgeschwindigkeit (m/min) 1000 1000 1000 Hostatron P 1941™ (Gew. % des Polyesters) 0,6 1,0 1,3 Polycarbonat (Gew. % des Polyesters) 0,6 1,0 1,3 Ergebnis Dichte des Fadens (g/cm3) 1,26 1,15 1,04 The same blowing agent and the same aggregate are used as in the previous series. Instead of polyethylene terephthalate granules, however, polybutylene terephthalate granules are now used. Spinning conditions D1 D2 D3 Hole diameter (mm) 1.2 1.2 1.2 Spinning titer (dtex) 37 37 37 Spinning temperature (° C) 267 267 267 Take-off speed (m / min) 1000 1000 1000 Hostatron P 1941 ™ (% by weight of the polyester) 0.6 1.0 1.3 Polycarbonate (% by weight of the polyester) 0.6 1.0 1.3 Result Thread density (g / cm3) 1.26 1.15 1.04

Wie aus der Tabelle ersichtlich, führt bei Polybutylenterephthalat erst ein höherer Gehalt an Treibmittel und Polycarbonat zu einer entsprechenden Verringerung der Fadendichte als bei Polyethylenterephthalat.As can be seen from the table, with polybutylene terephthalate only a higher content of blowing agent and polycarbonate leads to a corresponding reduction in the thread density than with polyethylene terephthalate.

Claims (8)

  1. A process for producing foam fiber from a polyester, a blowing agent and an additive, which comprises using sodium carbonate and citric acid as blowing agent and polycarbonate as additive.
  2. The process of claim 1, wherein the level of blowing agent is from 0.15 to 0.80 percent by weight of the polyester.
  3. The process of claim 2, wherein the polyester is polyethylene terephthalate and the level of blowing agent is from 0.15 to 0.4 percent by weight of the polyester.
  4. The process of claim 2, wherein the polyester is polybutylene terephthalate and the level of blowing agent is from 0.3 to 0.6 percent by weight of the polyester.
  5. The process of any one of the preceding claims, wherein the level of polycarbonate is from 0.5 to 2 percent by weight of the polyester.
  6. The process of claim 5, wherein the level of polycarbonate is from 1.0 to 1.5 percent by weight of the polyester.
  7. The process of any one of the preceding claims, wherein the polyester, the blowing agent and the polycarbonate are mixed in chip form - before melting - with the blowing agent being added in the form of a masterbatch.
  8. The process of any one of the preceding claims, wherein the blowing agent is added in the form of a masterbatch in a polyolefin.
EP91103256A 1990-03-09 1991-03-05 Process for the preparation of foamed fibres Expired - Lifetime EP0445708B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4007498A DE4007498A1 (en) 1990-03-09 1990-03-09 METHOD FOR PRODUCING FOAM THREADS
DE4007498 1990-03-09

Publications (3)

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EP0445708A2 EP0445708A2 (en) 1991-09-11
EP0445708A3 EP0445708A3 (en) 1992-10-28
EP0445708B1 true EP0445708B1 (en) 1994-11-23

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US (1) US5124098A (en)
EP (1) EP0445708B1 (en)
JP (1) JPH04214407A (en)
AT (1) ATE114338T1 (en)
DE (2) DE4007498A1 (en)
ES (1) ES2067069T3 (en)
IE (1) IE65671B1 (en)
PT (1) PT96985A (en)

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Also Published As

Publication number Publication date
JPH04214407A (en) 1992-08-05
PT96985A (en) 1991-10-31
DE4007498A1 (en) 1991-09-12
US5124098A (en) 1992-06-23
DE59103556D1 (en) 1995-01-05
EP0445708A3 (en) 1992-10-28
IE910784A1 (en) 1991-09-11
ES2067069T3 (en) 1995-03-16
EP0445708A2 (en) 1991-09-11
ATE114338T1 (en) 1994-12-15
IE65671B1 (en) 1995-11-15

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