EP1551605A4 - Procede de production de fibres synthetiques filees par fusion avec du polytetrafluoroethylene (ptfe) - Google Patents

Procede de production de fibres synthetiques filees par fusion avec du polytetrafluoroethylene (ptfe)

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Publication number
EP1551605A4
EP1551605A4 EP03770621A EP03770621A EP1551605A4 EP 1551605 A4 EP1551605 A4 EP 1551605A4 EP 03770621 A EP03770621 A EP 03770621A EP 03770621 A EP03770621 A EP 03770621A EP 1551605 A4 EP1551605 A4 EP 1551605A4
Authority
EP
European Patent Office
Prior art keywords
ptfe
fiber
fibers
melt
fabric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03770621A
Other languages
German (de)
English (en)
Other versions
EP1551605A1 (fr
Inventor
William Neuberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shamrock Technologies Inc
Original Assignee
Shamrock Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shamrock Technologies Inc filed Critical Shamrock Technologies Inc
Publication of EP1551605A1 publication Critical patent/EP1551605A1/fr
Publication of EP1551605A4 publication Critical patent/EP1551605A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • D01F1/10—Other agents for modifying properties
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber

Definitions

  • the present invention generally relates to a method for incorporating highly dispersible polytetrafluoroethylene (PTFE) powder into synthetic melt spun fibers so that the resulting fibers have the improved properties generally associated with PTFE, including, for example, low coefficient of friction, improved wear resistance, improved stain resistance and improved light stability and UV-light resistance, when compared to conventional melt spun fibers.
  • PTFE polytetrafluoroethylene
  • the present invention further relates to melt spun fibers made by the method described herein and textiles, fabrics, and articles of manufacture, made from these synthetic melt spun fibers
  • Fibers typically formed by melt spinning include polyester, nylon, and polypropylene, among others.
  • Polyester fiber one of the more common melt spun fibers, is defined by the Federal Trade Commission as a manufactured fiber in which the fiber-fomiing substance is any long-chain synthetic polymer composed of at least 85% by weight of an ester of a substituted aromatic carboxylic acid.
  • Polyester fiber is commonly produced by extruding (or spinning) a polyester melt at a high pressure (for example, 3,000 psig) and a high temperature (for example, 500° F) through spinnerets having multiple openings. Once extruded, the polyester fibers are drawn and textured to the desired fiber characteristics. Micro contaminants are removed from the molten polyester stream or feed prior to fiber spinning to preclude blockage of the small spinneret holes, which are typically about 25-500 ⁇ m in diameter. For low denier fibers, even small size contaminants or particles must be removed from the melt prior to extrusion. "Pall Corporation - Polyester Fiber Production,”
  • Additives may be added to the polymer or fiber-forming substance (such as a polyester melt) prior to extrusion in order to improve the quality or characteristics of the resulting melt spun fibers.
  • the addition of polytetrafluoroethylene (PTFE) powder (where the powder is dispersible to low micron or submicron particle size or where the PTFE powder particles have a primary particle size that is low micron or submicron range) to the fiber-forming substance may be of any benefit in forming improved melt spun fibers.
  • PTFE polytetrafluoroethylene
  • PTFE is useful when in a powder form or an aqueous or organic dispersion form for this purpose.
  • Dry PTFE powder products are known in the art and are generally available in the industry.
  • Several manufacturers in the fluoropolymer industry produce PTFE powders, and some of these manufacturers describe the PTFE particle size in their powders as being "submicron" or capable of being dispersed to submicron size.
  • small particle size or submicron PTFE A wide array of end uses exists for small particle size or submicron PTFE.
  • small amounts (e.g., about 0.1 to 2% by weight) of powdered PTFE may be incorporated into a variety of compositions to provide the following favorable and beneficial characteristics: (i) in inks, PTFE provides excellent mar and rub resistance characteristics; (ii) in cosmetics, PTFE provides a silky feel; (iii) in sunscreens, PTFE provides increased shielding from UN rays or increased SPF (sun protection factor); (iv) in greases and oils, PTFE provides superior lubrication; and (v) in coatings and thermoplastics, PTFE provides improved abrasion resistance, chemical resistance, weather resistance, water resistance, and film hardness.
  • submicron PTFE powders and dispersions include: (i) incorporating a uniform dispersion of submicron PTFE particles into electroless nickel coatings to improve the friction and wear characteristics of such coatings (Hadley et al., Metal Finishing, 85:51-53 (December 1987)); (ii) incorporating submicron PTFE particles into a surface finish layer for an electrical connector contact, wherein the PTFE particles provide wear resistance to the surface finish layer (U.S. Patent No.
  • submicron PTFE powders and submicron PTFE dispersions For many applications or end uses incorporating submicron PTFE powders and submicron PTFE dispersions (such as the end uses described above), the beneficial effects imparted to the application or end use system derive from the chemical inertness of the PTFE particles and/or the low coefficient of friction of the PTFE particles.
  • submicron PTFE particles that have a low particle size possess a significantly higher ratio of active surface area to weight when compared to larger PTFE particles.
  • submicron PTFE particles are better able to propagate their beneficial effects to a desired application system than the same weight of larger size PTFE particles.
  • the present invention relates to a novel method by which polytetrafluoroethylene (PTFE) is incorporated into a synthetic melt spun fiber so that the resulting fiber has many improved properties when compared to conventional melt spun fibers.
  • PTFE powder that is dispersible to low micron or submicron particle size is incorporated into the desired fiber-forming substance (such as a polyester melt) from which filaments or fibers are made by a melt spinning process.
  • the resulting "PTFE-enhanced" melt spun fibers have PTFE particles dispersed through out their filament bodies.
  • These PTFE-enhanced melt spun fibers in which PTFE is incorporated directly into the filament bodies have improved properties associated with PTFE.
  • the melt spun fibers resulting from the method of the present invention may exhibit a significant decrease in the coefficient of friction when compared to conventional melt spun fibers.
  • fibers incorporating PTFE may be useful in making textiles that are used for making industrial filtration and dewatering devices. Such fibers incorporating PTFE also may be advantageously used in producing carpets, fabrics for sportswear and outerwear, hot-air balloons, car and plane seats, umbrellas, and the like. Furthermore, the fibers of the present invention also may be advantageously used to make tightly woven fabrics that are used in parachutes, boat sails, and similar applications. The combination of a tight weave and water shedding may provide a textile or clothing fabric that is both water shedding and breathable. The incorporation of PTFE into such textiles may result in other advantages, such as the textile articles being easier to clean.
  • the method of the present invention is useful in that the resulting PTFE-enhanced melt spun fibers have several improved properties when compared to conventional synthetic melt spun fibers.
  • the improved properties include but are not limited to the following: lower coefficient of friction; reduced wettability; improved stain resistance; improved washability; improved opacity; enhanced protection from ultraviolet (UN) radiation (which increases the light-fastness and the lifetime of the fiber or fabric); increased color fastness; reduced gas permeability; better abrasion resistance; tighter weave; improved wear index; increased flexibility of the fiber; decreased scroop (where scroop generally refers to sounds of rubbing made by certain fabrics); and lowered amounts of wrinkling when the PTFE-enhanced fibers are incorporated into a fabric or clothing article.
  • the method of the present invention results in improved melt spun fibers, but also the method serves to significantly improve the overall processes by which melt spun synthetic fibers are typically made.
  • the increased lubricity or slipperiness of the fiber-forming substance due to the addition of PTFE in it may result in lower production times for fiber production, significantly increased processing speeds, increased throughput rates and overall production rates.
  • the increased lubricity of the fiber- forming materials due to the PTFE addition also may give a longer lifetime to the fiber-making equipment, and provide overall savings in energy that is expended in running the fiber-making equipment.
  • FIG. 1 is a bar graph comparing the tensile strength of PTFE-enhanced fibers prepared in accordance with the present invention and conventional fibers ,after both were exposed to radiation.
  • FIG. 2 is a bar graph illustrating the relative tensile strength of the fibers of FIG. 1
  • FIG. 3 is a bar graph illustrating the static and kinetic coefficients of friction of a fabric made of PTFE-enhanced fibers prepared in accordance with the present invention and the static and kinetic coefficients of friction of a fabric made of conventional fibers.
  • FIG. 4 is a bar graph comparing the static and kinetic coefficients of friction of another fabric made of PTFE-enhanced fibers prepared in accordance with the present invention and the static and kinetic coefficients of friction of a fabric made of conventional fibers.
  • the present invention relates to a method for producing improved melt spun fibers, wherein the fibers are more wear resistant and have a lower coefficient of friction than melt spun fibers that are known in the art.
  • the method of present invention improves the quality of a melt spun fiber by introducing PTFE that is dispersible to low micron or submicron particle size into the polymer or fiber-forming substance as a fiber is being formed by a melt spinning process.
  • the PTFE-enhanced melt spun fibers that are produced by the method of the present invention exhibit, among other properties, increased wear resistance, stain resistance, water resistance, and a significantly decreased coefficient of friction, when compared to conventional melt spun fibers known in the art.
  • a result of the present invention is the incorporation of PTFE throughout a melt spun fiber so that the fiber material contains a homogeneous distribution of PTFE particles. This may be contrasted with processes and fibers known in the art where PTFE is applied only on the surface of melt spun fibers or only on the surface of a fabric made from melt spun fibers and thus can wear away.
  • PTFE powder that is dispersible to submicron particle size PTFE powder that is dispersible to low micron particle size
  • aqueous or organic dispersions of PTFE powder that is dispersible to submicron particle size aqueous or organic dispersions of PTFE powder that is dispersible to low micron particle size.
  • PTFE powder that is dispersible to submicron particle size PTFE powder that is dispersible to low micron particle size.
  • aqueous or organic dispersions of PTFE powder that is dispersible to submicron particle size aqueous or organic dispersions of PTFE powder that is dispersible to low micron particle size
  • aqueous or organic dispersions of PTFE powder that is dispersible to low micron particle size a specific type of PTFE that may be useful in the method of the present invention is the PTFE described in co-assigned International Patent Application No. PCT/US03/07978 filed on March 14, 2003, which is hereby incorporated by reference here
  • the designation "submicron particle size” indicates that a given quantity of PTFE powder disperses in isopropyl alcohol (IP A) such that more than about 90%, preferably, more than about 95%, and more preferably, more than about 99% of the PTFE particles have a particle size that is less than about 1.00 ⁇ m.
  • the designation "low micron particle size” indicates that a given quantity of PTFE powder disperses in isopropyl alcohol (IP A) such that about 95% or more of the PTFE particles have a particle size that is less than about 10.00 ⁇ m.
  • the dispersibility of the PTFE powder down to low micron or submicron-sized particles may be important for unhindered practice of melt spinning processes. These small size PTFE particles may pass through spinneret holes with ease, unlike large sized PTFE particles that can clog spinnerets making fiber formation difficult. It is also envisioned that the method of the present invention allows for PTFE that is dispersible to low micron particle size to be used in higher denier fibers, while PTFE that is dispersible to submicron particle size will be useful for forming both low and high denier fibers.
  • the PTFE particles may be uniformly or homogeneously dispersed through the bodies of the fiber of any denier size.
  • the dispersibility of the PTFE particles in a powder may be determined by dispersing an amount of the PTFE powder in isopropyl alcohol (IP A). Then by conventional particle size analysis (e.g., light scattering analysis), an indication of the mean particle size and the particle size distribution of the PTFE powder may be obtained. Thus a user can verify or confirm, for example, if a sample of PTFE powder is completely (100%) dispersible to submicron in size or is otherwise suitable for use in melt spinning processes.
  • IP A isopropyl alcohol
  • aqueous or organic dispersions of PTFE powder where the powder is dispersible either to submicron particle size or low micron particle size, may be used in the method of the present invention.
  • PTFE dispersions that are most useful in the present method typically comprise from about 20% to about 60% PTFE by weight.
  • dry PTFE powder that is dispersible either to submicron or low micron particle size may be dispersed directly into the fiber- forming substance.
  • Fiber-forming polymer substances that are contemplated for use in the present invention include but are not limited to polyester, nylon, and polypropylene, among other fiber-forming thermoplastic resins.
  • PTFE powder that is dispersible either to low micron or submicron particle size is first provided. Subsequently, the PTFE is incorporated into the fiber-forming polymer to be used in making the melt spun fibers.
  • poly(efhylene) terephthalate (PET) may be used as the fiber-forming polymer.
  • the submicron or low micron dispersible PTFE powder is incorporated into the fiber-forming polymer (such as PET) in three primary ways: 1) the dispersible PTFE powder is introduced and dispersed directly into the fiber-forming polymer in its dry powder form; 2) the dispersible PTFE powder is introduced into the fiber-forming polymer in the form of an aqueous or an organic dispersion; or 3) the dispersible PTFE powder is introduced into the fiber-forming polymer in the form of a pelletized master batch.
  • the highly dispersible PTFE described herein may be introduced at any stage of a melt spinning process for making fibers prior to the fiber-forming polymer going through the spinneret.
  • a pelletized master batch of PTFE is fonned and incorporated into the fiber-forming polymer in the same manner that master batches of pigments or flame retardants are formed and incorporated into melt spun fibers.
  • the introduction of the highly dispersible PTFE in the fonn of a pelletized master batch is prefe ⁇ ed.
  • the master batches of PTFE in a fiber-forming polymer that are useful in the present invention typically comprise about 5% to about 60% PTFE, and more particularly about 40% to about 45% PTFE.
  • the melt-spun fibers that are made according to the present invention are thin fibers, having a denier of less than about 10.
  • thicker, coarse melt spun fibers also may be produced having PTFE incorporated therein.
  • the PTFE-enhanced melt spun fibers produced by the method of the present invention may be incorporated into a fabric or a textile, whereby the fabric or textile has the enhanced properties typically associated with the addition of PTFE to articles or compositions.
  • fabrics or textiles made with the fibers of the present invention can exhibit a significantly decreased coefficient of friction. Fabrics or textiles with such properties may be useful for making apparel intended for wear in sports or recreational activities.
  • PTFE-enhanced melt spun fibers of the present invention include the exceptional wear resistance and stain resistance exhibited by the fibers, the light-fastness and UV-ray resistance of the fibers, the colorfastness of the fibers, and the resistance to degradation of the fibers.
  • the PTFE-enhanced fibers and/or the fabrics made from the PTFE-enhanced fibers of the present invention maybe wear tested to detennine the wear resistance of the fibers.
  • the wear testing may include Taber testing, Mace testing, and Pilling tests.
  • tests may be performed to determine the tenacity of the fabric, the elongation of the fabric, and the draw.
  • the same full range of tests that are commonly used in the industry to analyze the properties of melt -spun fibers may be employed to test the fibers of the present invention. Tests used in other industries and other scientific test methods can also be used to characterize the fibers and fabrics of the present invention.
  • bicomponent fibers are generally described as fibers, which comprise two polymers having different chemical and/or physical properties extruded from the same spinneret with both polymers within the same filament.
  • advantages afforded by bicomponent fibers include thermal bonding of the two polymers, self-bulking of the fibers, the ability to make fibers having unique cross-sections, and the ability to reap the benefits of special polymers or additives at a reduced cost.
  • bicomponent fibers have one of the following configurations: sheath/core; side-by-side; or eccentric sheath/core.
  • any bicomponent fiber configuration may benefit from the method of the present invention.
  • Typical polymer combinations used in the synthetic fiber industry to make bicomponent fibers include: fibers having a polyester core with a copolyester sheath; fibers having a polyester core with a polyethylene sheath; and fibers having a polypropylene core with a polyethylene sheath.
  • bicomponent fibers are sought, it may be possible to make fibers having sheath/core configurations where a polymer, such as poly(ethylene) terephthalate (PET), is used as the core, while the sheath contains a polymer (such as PET) having highly dispersible PTFE particles incorporated therein according to the present method.
  • a polymer such as poly(ethylene) terephthalate (PET)
  • PET poly(ethylene) terephthalate
  • bicomponent fibers are made wherein the sheath contains from about 2% to about 40% or more PTFE.
  • a rub test was performed to compare the properties of one knitted sleeve made from melt spun fibers in which PTFE had been incorporated into the fibers according to the present method, and another knitted sleeve made from conventional melt spun fibers that did not have any incorporated PTFE.
  • a specific, very sensitive type of rub testing that is typically used with printing inks (according to ASTM D-5181) provided a straightforward and definitive method of testing the wear and the fiictional characteristics of these knitted sleeves.
  • This rub test method which may performed using a Sutherland Ink Rub Tester , was suitably adapted in this Example for use with fabrics made from melt spun fibers.
  • This rub test may be as sensitive or possibly even more sensitive to a trained operator than the other standard rub tests that are typically used in the fiber or textile industry.
  • the synthetic fibers used to make the sleeves for this Example were made of PET, the polymer discussed in detail above that is typical for making polyester fibers.
  • PTFE that is dispersible to low micron or submicron particle size was incorporated into the PET polymer resin so that after the PTFE-enhanced polyester fibers were formed and manufactured into a sleeve, the amount of PTFE in the resulting sleeve was about 5% by weight.
  • the denier of the PTFE-enhanced fibers was 240, and the Denier Per Filament (DPF) was 7.06.
  • Sleeve 1 was knitted from the inventive PTFE-enhanced polyester fibers, using 4-inch cylinders and 144 needles in a jersey knit fashion.
  • no PTFE was incorporated into the PET polymer resin used to make the polyester fibers that made up that sleeve.
  • the polyester fibers used in Sleeve 2 were melt spun in the same fashion as Sleeve 1.
  • Sleeve 2 was knitted in the same jersey knit fashion as Sleeve 1.
  • a Standard Receptor Stock (#5 ASTM D-1581) first was secured to the 4-pound weight.
  • Sleeve 1 was then placed on the pad of the Sutherland Ink Rub Tester.
  • the Standard Receptor Stock was placed over Sleeve 1 and was secured by the weight arm of the Ink Rub Tester. Then, the number of strokes was set to 450 and the rub abrasion test begun. After completion of 450 strokes, the 4-pound weight was removed from the fabric. The same testing procedure was used for Sleeve 2.
  • Sleeves 1 and 2 were visually compared to determine the level of abrasion caused by the rub test. Specifically, the sections of each sleeve that were rubbed by the Standard Receptor Stock, was visually scrutinized to determine which sleeve had a lower number of scratches. It was determined that the knitted sleeve Sleeve 1 (made of 5% PTFE content fiber) showed fewer scratches than Sleeve 2 (made of 0% PTFE content fiber). These results illustrate the improved abrasion resistance imparted to fibers by the incorporation of PTFE.
  • Example 2 Rub Testing of Fabrics Made with PTFE-Enhanced Melt Spun Fibers
  • Sleeves 3 and 4 were formed in exactly the same manner as Sleeves 1 and 2, respectively, discussed in Example 1 above.
  • Sleeve 3 and Sleeve 4 were processed through the Sutherland Ink Rub Tester using the same general procedure (slow speed and weights) as described above in the context of testing Sleeve 1 and Sleeve 2 (Example 1).
  • the reference printed film was first placed on a pad in the tester.
  • the test sleeve (Sleeve 3 and then Sleeve 4) was secured to the 4-pound weight and rubbed against the reference printed film for 450 strokes. After the rubbing strokes, Sleeves 3 and 4 were visually inspected to assess the number of scratches on them.
  • the reference printed film was similarly inspected to assess damage to it. Visual observations showed that Sleeve 3 had less scratches on it than Sleeve 4. Further, Sleeve 3 had caused less damage to the printed ink film than did Sleeve 4.
  • Example 1 testing was performed to determine and compare the kinetic coefficient of friction values for fabrics made with conventional polyester fibers and fabrics made with polyester fibers in which PTFE had been incorporated according to the present invention.
  • Sleeves 5 made from conventional fibers and Sleeve 6 made form PTFE-enhanced fibers were tested in this Example. These sleeves were made or knitted in the same manner as Sleeves 2 and 1, respectively, (Example 1).
  • the coefficient of friction tests performed in this Example were sliding or pulling tests, which serve to measure the coefficient of friction of each of the sleeves.
  • Sleeve 5 (having fibers with no PTFE therein) was first secured to the surface of a friction-testing machine (Altek Model 9505 A sold by ALTEK Company of 245 East Elm Street, Torrington, CT 06790 USA), which is equipped with a 2000 gram sliding weight. This sliding weight was placed on Sleeve 5, and the coefficient of friction indicator of the friction-testing machine was engaged. The pulling speed was set to 20 inches per minute, and the pulling begun. The coefficient of friction (COF) indicator of the machine gave a number for the COF. The test was repeated 6 times to obtain an average COF value for Sleeve 5. The same test procedure was employed to obtain an average COF value for Sleeve 6, the sleeve containing PTFE-enhanced fibers. The COF results obtained are shown in Table 1 below: Table 1
  • Example 4 Coefficient of Friction Testing of Fabrics Made with PTFE- Enhanced Melt Spun Fibers Using Sliding Angle Testing
  • Sleeves 7 and 8 were formed in exactly the same manner as Sleeves 5 and 6, respectively, described in Example 3 above.
  • Sleeve 7 was made of polyester fibers having no PTFE
  • Sleeve 8 was made from PTFE-enhanced polyester fibers according to the present invention.
  • the COF testing procedure used in this example involves a sliding angle test to study the fiictional properties of each of the sleeves, and to determine the static coefficient of friction for each sleeve.
  • a Sliding Angle Coefficient of Friction Tester (Model # 32-35) was used for this purpose. In the tester three different counter surface materials were used: (1) Mylar film; (2) printing paper (70# alphabet gloss); and (3) treated C- 184 foil.
  • Sleeve 7 was secured to a weight.
  • the counter surface material was placed into a holder in the sliding tester. Then, weighted Sleeve 7 was properly positioned on the counter surface material in preparation for measuring its sliding angle.
  • the counter surface was raised from one end to determine the angle at which weighted Sleeve 7 began to slide. The measurements were repeated 5 times, so that an average value for the sliding angle could be calculated for Sleeve 7.
  • a COF value was calculated from the average sliding angle value.
  • Sleeve 8 the polyester knitted sleeve having 5% PTFE incorporated into its fibers, had a lower coefficient of friction when compared to Sleeve 7 which was made from conventional polyester fibers without PTFE additives.
  • Example 5 Measurement of Increased UV Protection of Fabrics Made with PTFE-Enhanced Melt Spun Fibers Using Tensile Strength Testing hi this Example, the resistance of fabrics made with PTFE-enhanced melt spun fibers to ultraviolet radiation (UV) degradation was investigated. hi one investigation, the tensile breaking strength of non-woven fibers was tested both before and after controlled exposures to ultraviolet radiation (UV) ) in a laboratory instrument to simulate radiation degradation of fabrics in field use. An industry standard test procedure SAE Jl 885 was used. This procedure is commonly used in the automotive industry to evaluate the light fastness of automotive interior fabrics.
  • UV ultraviolet radiation
  • the procedure as used in the automotive industry may use standard light exposures of 226 kJ (e.g., Chrysler Group, DaimlerChrysler Corporation, Auburn Hills, MI 48326) or 488 kJ (e.g., Ford Motor Company, Dearborn, Michigan 48126).
  • Conventional fiber material prepared without any PTFE content was used as a control material.
  • the tensile strengths of a test sample and a control sample were determined by loading the fibers to determine the breaking force required break the fibers. The samples were first tested prior to UV i ⁇ adiation. The forces required to break the test and control sample fibers were measured to be 260 newtons and 270 newtons, respectively.
  • both the test and the control samples were exposed various levels of to UV lamp radiation in a laboratory wear simulator (Atlas Electric Model No. Ci4000 Weatherometer®, sold by Atlas Electric Devices Company, 4114 N Ravenswood Ave, Chicago, IL 60613 ).
  • This simulator uses xenon arc lamps with up to 2X solar irradiance for accelerated weathering of test specimens.
  • the radiation exposure levels were in the amounts of 225, 490, 600, 800, and 1100 kJ/m 2 .
  • With increasing radiation exposure i.e., at 800 kJ/m 2
  • the control sample disintegrated.
  • the test sample retained it structural integrity at all exposures up to and including 1100 kJ/m 2 .
  • FIG. 1 is a bar graph comparing the tensile strength (lbs./sq.in.) of the two samples as a function of radiation exposure. Data in the range of 0 kJ/m2 to 1100 kJ7m2 of radiation exposure is shown.
  • FIG. 2 is a bar graph showing the normalized strengths of the test and control samples after radiation exposure in the range of 225 kJ/m2 to 1100 kJ/m2.
  • Product categories 1 and 3 (labeled as 1/150/100 and 1/150/50 control products, respectively) were sleeves knitted from yarn with no PTFE additives , respectively.
  • Product categories 2 and 4 (labeled as 1/150/100 and 1/150/50 PTFE products, respectively) were sleeves knitted from PTFE-enhanced yarn.
  • the successive numbers in a label respectively refer to the ply, denier and number of filaments in the yarn.
  • the 1/150/100 label refers to a one-ply, 150 denier, 100 filament yarn.
  • the PTFE concentration in both the 1/100/100 and 1/100/50 PTFE-enhanced fibers was estimated to be about 1.75%.
  • the first row in each product category refers to an instrument calibration or reference measurement of tube yarn.
  • the second row refers to measurements of yarn unraveled from the sample sleeves before they were exposed to the test light exposure in the Atlas Weatherometer instrument.
  • the third row refers to measurements on yarn unraveled from the sample sleeves after light exposure in the Atlas Weatherometer instrument. The last measurement was repeated on three separately unraveled strands of yarn for each product category.
  • the scatter seen in the test results on unraveled yarn from both exposed and unexposed sleeves may be related to the weave or knitting structure of the textile fabrics from which the sleeves are made.
  • the results however on the whole indicate that fibers with a concentration of PTFE additives are significantly stronger than fiber without PTFE additives.
  • Example 6 hnproved Moisture Management Properties of Fabrics Made with PTFE- Enhanced Melt Spun Fibers.
  • the moisture handling or management capabilities of fabrics made with PTFE-enhanced melt spun fibers were investigated.
  • the moisture handling or management capabilities of fabrics were determined by measuring the extent of capillary wicking in strips of fabric that were dipped in a water solution.
  • the water was conveniently colored, which allowed visual observation of the wicking waterfront as the fabric absorbed water.
  • the colored water solution was prepared by adding green food dye to water in a beaker. The amount of dye added to the water was sufficient to raise the conductivity of the dye solution to be about 1000 Mhos ⁇ 100 Mhos.
  • Two PTFE-enhanced fiber fabric strips (labeled PTFE-1 and PTFE-2) were tested. The two strips were tested along with two control fabric strips, Control- 1, and Control-2, respectively. Test samples and control fabric samples were cut into 1 inch wide by 8 inches long strips. The strips were conditioned in a 65% ⁇ 2% humidity atmosphere at about 70° Fahrenheit for at least 4 hours immediately prior to testing. The fabric strips were held vertically over the water solution with their ends dipped in a beaker of the colored water solution. One inch of the bottom end of the test fabric strip was submerged in the dye solution. A stopwatch was started when the bottom one inch of the fabric strip was submerged in the colored water solution. The upward wicking of the colored water into the fabric strip was observed.
  • Example 7 Abrasion Testing of Fabrics Made with PTFE-Enhanced Melt Spun Fibers.
  • the abrasion resistance properties of fabrics made with PTFE-enhanced melt spun fibers were evaluated.
  • the abrasion properties were evaluated using a conventional Taber testing method that is used for evaluating textiles. The method involves holding a piece of textile fabric on a base plate of a test unit and repeatedly running a wheel under load across the textile fabric surface to wear it down. The weight of textile fabric piece is measured before and after the test. The weight loss due to wear is an indication of the abrasion resistance properties of the fabric.
  • a sample fabric made from PTFE-enhanced fibers was tested.
  • the fabric was made with a 1/150/100 PTFE-enhanced yarn.
  • the sample was tested along with a control fabric sample made with conventional yarn without PTFE additives.
  • These samples (labeled PTFE-3 and Control-3, respectively) were wear tested on a commercial instrument (Taber Abraser Model 503, sold by Taber Instruments Corporation, North Tonawanda, NY USA). Each fabric sample was weighed prior to testing. The fabric sample then was held on the base plate of the instrument by vacuum.
  • a wheel (H-10 size) was run over the surface of fabric sample for 200 cycles. The wheel was loaded with 500 grams of weight.
  • PTFE-4 wear testing of a PTFE-enhanced fabric sample
  • Control-4 a control sample
  • the tests were conducted using a H- 18 size wheel under a 1000 g load.
  • the PTFE-4 sample for non- woven carpet applications was made from 18 decitex PET fiber having a PTFE content of about 2.25% (similar to the PTFE-1 and 2 samples above) and containing about 1.5% of color pigment.
  • the control sample was fabricated from undrawn PET fiber (80 decitex).
  • the PTFE-4 sample was subject to 2000 wheel cycles of wear.
  • the Control-4 sample was subject to only 600 wheel cycles of wear as by that time it had disintegrated and roughened sufficiently to interfere with wheel motion. Both samples were weighed before and after the wear cycles. The test results are shown in Table 6.
  • test data shows that the PTFE- 4 sample even though subject to a larger number of wheel cycles of wear (2000 v. 600) showed less wear that the control-4 sample. Accordingly, PTFE-enhanced fibers may be expected show less wear than conventional fibers in non-woven carpet applications.
  • Example 8 Coefficient of friction Testing of Textile Fabrics Made with PTFE- Enhanced Melt Spun Fibers.
  • COF scale reading x 2000/slide weight.
  • Two PTFE-enhanced fiber fabrics (labeled PTFE-5 and PTFE-6) were tested. The two fabrics were made from 1/100/50 and 1/150/100 PTFE-enhanced yarns, respectively. Samples from these PTFE-enhanced fiber fabric strips were tested along with samples from two control fabrics (labeled Control-5 and Confrol-6) that were made from conventional fiber.
  • the three slide weights used including the attached fabric weighed about 184, 284 and 384 grams respectively. Each fabric was tested four times with each slide weight.
  • the test data (strain gauge readings) and the scaled coefficients of friction (strain gauge readings x 2000/slide weight) are shown in Tables 8 and 9. Tables 8 and 9 also show the percentage improvement in COF for each of the PTFE-enhanced fabrics tested relative to the control fabrics.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Textile Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Artificial Filaments (AREA)
  • Multicomponent Fibers (AREA)
  • Woven Fabrics (AREA)

Abstract

L'invention concerne un procédé de production de fibres filées par fusion, présentant un moindre coefficient de frottement et d'autres propriétés améliorées, telles que la résistance à l'usure et analogues, comparativement aux fibres filées par fusion conventionnelles. Selon le procédé de l'invention, du polytétrafluoroéthylène (PTFE) est incorporé dans la substance formant les fibres durant le processus de filage par fusion, avant le passage à la filière. Le PTFE utilisé dans l'invention comprend de la poudre de PTFE dispersible en une faible granulométrie, de l'ordre du micron ou du sous-micron, et des dispersions aqueuses ou organiques d'une telle poudre de PTFE hautement dispersible. L'invention concerne en outre des tissus, des produits textiles et autres articles manufacturés fabriqués à partir de fibres filées par fusion, améliorées au PTFE selon l'invention.
EP03770621A 2002-10-01 2003-10-01 Procede de production de fibres synthetiques filees par fusion avec du polytetrafluoroethylene (ptfe) Withdrawn EP1551605A4 (fr)

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US41503902P 2002-10-01 2002-10-01
US415039P 2002-10-01
PCT/US2003/031264 WO2004030880A1 (fr) 2002-10-01 2003-10-01 Procede de production de fibres synthetiques filees par fusion avec du polytetrafluoroethylene (ptfe)

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EP1551605A1 EP1551605A1 (fr) 2005-07-13
EP1551605A4 true EP1551605A4 (fr) 2006-06-07

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US (1) US20060154058A1 (fr)
EP (1) EP1551605A4 (fr)
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AU (1) AU2003279111A1 (fr)
CA (1) CA2500900A1 (fr)
WO (1) WO2004030880A1 (fr)

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DE102006043065B3 (de) * 2006-09-14 2007-10-31 Federal-Mogul Deva Gmbh Kunststoffgleitschicht und Gleitelement mit einer solchen
DE102006042999B3 (de) * 2006-09-14 2007-10-25 Federal-Mogul Deva Gmbh Gleitelement, Verfahren und Vorrichtung zu dessen Herstellung
US20100068516A1 (en) * 2007-02-26 2010-03-18 Joon-Young Yoon Thermoplastic fiber with excellent durability and fabric comprising the same
ATE507891T1 (de) 2007-06-06 2011-05-15 Toedi Sport Ag Glarus Verfahren zum herstellen eines steigfells, sowie steigfell hergestellt nach diesem verfahren
DE102011057150B4 (de) * 2011-12-29 2024-03-07 Saati Deutschland Gmbh Faden und Gewebe für Insektenschutzgitter, Insektenschutzgitter sowie Verfahren zum Herstellen von Geweben für Insektenschutzgitter
WO2014016753A1 (fr) * 2012-07-26 2014-01-30 Kordsa Global Endustriyel Iplik Ve Kord Bezi Sanayi Ve Ticaret Anonim Sirketi Procédé de production d'une fibre de nylon comprenant un fluoropolymère
SE537818C2 (sv) * 2013-04-05 2015-10-27 Ten Medical Design Ab Strålskyddande material
WO2015057780A1 (fr) 2013-10-17 2015-04-23 Rudinger Richard F Fibre synthétique polymère post-extrudée dotée de cuivre
WO2015057783A1 (fr) 2013-10-17 2015-04-23 Rudinger Richard F Fibre synthétique artificielle polymère post-extrudée à polytétrafluoroéthylène (ptfe)
CN108103799A (zh) * 2016-06-24 2018-06-01 苏州益可泰电子材料有限公司 耐磨皮带
WO2019173308A1 (fr) * 2018-03-06 2019-09-12 Avx Corporation Condensateur céramique multicouche ayant une performance ultra large bande
WO2019173472A1 (fr) * 2018-03-06 2019-09-12 Avery Dennison Retail Information Services, Llc Étiquette et procédé associé
CN111483182B (zh) * 2020-02-20 2024-12-20 江苏华跃纺织新材料科技股份有限公司 一种聚四氟乙烯基材医用防护材料及其制造方法
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EP1551605A1 (fr) 2005-07-13
CA2500900A1 (fr) 2004-04-15
JP2006501381A (ja) 2006-01-12
US20060154058A1 (en) 2006-07-13
WO2004030880A1 (fr) 2004-04-15

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