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
  • 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
  • D01F6/70—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyurethanes
• • 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
  • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
  • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
  • D01F8/16—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one other macromolecular compound obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds as constituent
• • 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
  • D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
  • D01D5/30—Conjugate filaments; Spinnerette packs therefor
  • D01D5/34—Core-skin structure; Spinnerette packs therefor
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
  • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
  • D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
  • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
  • D03D15/292—Conjugate, i.e. bi- or multicomponent, fibres or filaments
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
  • D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
  • D03D15/56—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads elastic
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
  • D04B1/14—Other fabrics or articles characterised primarily by the use of particular thread materials
  • D04B1/18—Other fabrics or articles characterised primarily by the use of particular thread materials elastic threads
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
  • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
  • D04H1/4326—Condensation or reaction polymers
  • D04H1/4358—Polyurethanes
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
  • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
  • D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
  • D04H1/43825—Composite fibres
  • D04H1/43828—Composite fibres sheath-core
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
  • D04H3/005—Synthetic yarns or filaments
  • D04H3/009—Condensation or reaction polymers
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
  • D10B2331/10—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyurethanes

Definitions

• the present technology relates to bicomponent fibers and fabrics made therefrom, in particular, core-sheath fibers, made from two different thermoplastic polyurethanes to provide a fiber having unique properties.
• the present invention relates to a bicomponent fiber, wherein the bicomponent fiber has a core and sheath structure, wherein the bicomponent fiber comprises (a) a core comprising a first polyester thermoplastic polyurethane which has a melting enthalpy of at least 50 J/g measured according to ASTM D3418 and (b) a sheath comprising a second pol yester thermoplastic polyurethane which has a melting enthalpy of 5 J/g or less measured according to ASTM D3418.
• the present invention also relates to fabrics made from the bicomponent fibers of the present invention.
• bicomponent fiber refers to a conjugated product of at least two melt-spinnable components, wherein the conjugated product has at least two different longitudinally coextensive polymeric segments.
• the bicomponent fiber of the present invention comprises two different polymer materials intimately adhered to each other along the length of the fiber, so that the fiber cross-section is for example, a core-sheath arrangement.
• the bicomponent fiber of the present invention is made from two different polyester thermoplastic polyurethanes.
• a thermoplastic polyurethane is generally prepared by reacting a polyisocyanate with a polyol intermediate, and optionally a chain extender all of which are well known to those skilled in the art.
• the bicomponent fiber of the present invention uses two different thermoplastic polyurethane materials, each based on a different polyester polyol intermediate.
• Hydroxyl ter minated polyester intermediates are generally a linear polyesters having a number average molecular weight (Mn) of from about 500 to about 10,000, desirably from about 700 to about 5,000, and preferably from about 700 to about 4,000, an acid number generally less than 1.3 and preferably less than 0.8.
• Mn number average molecular weight
• the molecular weight is determined by assay of the terminal functional groups and is related to the number average molecular weight.
• polyester pol yols are produced by (1) an esterification reaction of one or more glycols with one or more di carboxylic acids or anhydrides or (2) by transesterification reaction, i.e., the reaction of one or more glycols with esters of dicarboxylic acids. Mole ratios generally in excess of more than one mole of glycol to acid are preferred so as to obtain linear chains having a preponderance of terminal hydroxyl groups. Suitable polyester intermediates also include various lactones such as polycaprolactone typically made from e-caprolactone and a bifunctional initiator such as di ethylene glycol.
• the dicarboxylic acids of the desired polyester can be aliphatic, cycloal iphatic, aromatic, or combinations thereof.
• Suitable dicarboxylic acids which may be used alone or in mixtures generally have a total of from 4 to 15 carbon atoms and include: succinic, glutaric, adipic, pimelic, suberic, azelaic, sebacic, dodecanedioic, isophthalic, terephthalic, cy clohexane dicarboxylic, and the like.
• Anhydrides of the above dicarboxylic acids such as phthalic anhydride, tetrahydrophthalic anhydride, or the like, can also be used.
• the glycols which are reacted to form a desirable polyester intermediate can be aliphatic, aromatic, or combinations thereof, and have a total of from 2 to 12 carbon atoms, and include ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6- hexanediol, 2, 2-dimethyl-l, 3 -propanediol, 1,4-cyclohexanedimethanol, decamethylene glycol, dodecamethylene glycol, and the like.
• the fiber of the present invention includes a first thermoplastic polyurethane based on the butanediol succinate and a second thermoplastic polyurethane based on butanediol adipate.
• Thermoplastic polyurethanes used in the present invention are made using a polyisocyanate component.
• the polyisocyanate component includes one or more diisocyanates.
• Useful polyisocyanates may be selected from aromatic polyisocyanates or aliphatic polyisocyanates or combinations thereof.
• polyisocyanates examples include, but are not limited to aromatic diisocyanates such as 4,4 ' -methylenebis(phenyl isocya nate) (MDI), w-xylene diisocyanate (XDI), phenylene-1, 4-diisocyanate, 3,3’-dimethyl-4,4’- biphenylene diisocyanate (TODI), 1,5 -naphthalene diisocyanate (NDI), and toluene diisocya nate (TDI), as well as aliphatic diisocyanates such as isophorone diisocyanate (IPDI), 1,6- hexamethylene diisocyanate (HDI), 1,4-cyclohexyl diisocyanate (CHDI), decane- 1, 10-diiso cyanate, lysine diisocyanate (LDI), 1,4-butane diisocyanate (BDI), and dicyclohex
• the polyisocyanate component comprises or consists of one or more aromatic diisocyanates. In some embodiments, the polyisocyanate component is es sentially free of, or even completely free of, aliphatic diisocyanates.
• thermoplastic polyurethane compositions described herein are optionally made using a chain extender component.
• Chain extenders include may include diols, diamines, and combination thereof.
• Suitable chain extenders include relatively small polyhydroxy compounds, for ex ample lower aliphatic or short chain glycols having from 2 to 20, or 2 to 12, or 2 to 10 carbon atoms.
• Suitable examples include ethylene glycol, diethylene glycol, propylene glycol, di propylene glycol, 1,4-butanediol (BDO), 1,6-hexanediol (HDO), 1,3-butanediol, 1,5-pen- tanediol, neopentylglycol, 1,4-cyclohexanedimethanol (CHDM), 2,2-bis[4-(2-hydroxyeth- oxy) phenyljpropane (HEPP), hexamethylenediol, heptanediol, nonanediol, dodecanediol, 3- methyl-l,5-pentanediol, ethylenediamine, butanediamine, hexamethylenediamine,
• any conventional catalyst can be utilized to react the diisocyanate with the hydroxyl terminated intermediate or the chain extender and the same is well known to the art and to the literature.
• suitable catalysts include the various alkyl ethers or alkyl thiol ethers of bismuth or tin wherein the alkyl portion has from 1 to about 20 carbon atoms with specific examples including bismuth octoate, bismuth laurate, and the like.
• Pre ferred catalysts include the various tin catalysts such as stannous octoate, dibutyltin dioc-leader, dibutyltin dilaurate, and the like. The amount of such catalyst is generally small such as from about 20 to about 200 parts per million based upon the total weight of the polyure thane forming monomers.
• thermoplastic polyurethanes of this invention can be made by any of the con ventional polymerization methods well known in the art and literature.
• Thermoplastic polyurethanes of the present invention are preferably made via a "one shot” process wherein all the components are added together simultaneously or substantially simultaneously to a heated extruder and reacted to form the polyurethane.
• the equivalent ratio of the diisocyanate to the total equivalents of the hydroxyl terminated inter mediate and the diol chain extender is generally from about 0.95 to about 1.10, desirably from about 0.97 to about 1.03, and preferably from about 0.97 to about 1.00.
• the molecular weight (Mw) of thermoplastic polyurethanes useful in the present invention may be from about 50,000 Daltons to about 300,000 Daltons, for example, 50,000 Daltons to about 100,000 Daltons as measured by GPC relative to polystyrene standards.
• the thermoplastic polyurethane used for the sheath in the bicomponent fiber of the present invention has a molecular weight of about 50,000 Daltons to 75,000 Daltons.
• the thermoplastic polyurethane used for the core in the bicomponent fiber of the present invention has a molecular weight of about 80,000 Daltons to about 100,000 Daltons.
• thermoplastic polyurethanes can also be prepared utilizing a pre-polymer process.
• the hydroxyl terminated intermediate is reacted with generally an equivalent excess of one or more polyisocyanates to form a pre-polymer solution having free or unreacted polyisocyanate therein.
• a selective type of chain extender as noted above is added in an equivalent amount generally equal to the isocyanate end groups as well as to any free or unreacted diisocyanate compounds.
• the overall equivalent ratio of the total diisocyanate to the total equivalent of the hydroxyl terminated intermediate and the chain extender is thus from about 0.95 to about 1.10, desirably from about 0.98 to about 1.05 and preferably from about 0.99 to about 1.03.
• the pre-polymer route can be carried out in any conventional device with an extruder being preferred.
• the hydroxyl termi nated intermediate is reacted with an equivalent excess of a diisocyanate in a first portion of the extruder to form a pre-polymer solution and subsequently the chain extender is added at a downstream portion and reacted with the pre-polymer solution.
• Any conventional extruder can be utilized, with extruders equipped with barrier screws having a length to diameter ratio of at least 20 and preferably at least 25.
• Useful additives can be utilized in suitable amounts and include opacifying pigments, colorants, mineral fillers, stabilizers, lubricants, UV absorbers, processing aids, and other additives as desired.
• Useful opacifying pigments include titanium dioxide, zinc oxide, and titanate yellow
• useful tinting pigments include carbon black, yellow oxides, brown oxides, raw and burnt sienna or umber, chromium oxide green, cadmium pigments, chromium pigments, and other mixed metal oxide and organic pigments.
• Useful fillers in clude diatomaceous earth (superfloss) clay, silica, talc, mica, wollastonite, barium sulfate, and calcium carbonate.
• useful stabilizers such as antioxidants can be used and include phenolic antioxidants, while useful photostabilizers include organic phosphates, and organotin thiolates (mercaptides).
• useful lubricants include metal stearates, paraffin oils and amide waxes.
• Useful UV absorbers include 2-(2'-hydroxyphenol) benzotriazoles and 2-hy- droxybenzophenones.
• Plasticizer additives can also be utilized advantageously to reduce hardness with out affecting properties.
• Bicomponent continuous filaments of the present invention can be made using a melt-spinning process.
• Figure 1 illustrates the typical bicomponent melt spinning technique with a pair of extruders.
• the steps for making the bicomponent fibers include vacuum batch drying at 80°C for 12 hours, feeding of dried thermoplastic polyurethane polymers into ex truder from a hopper, melting the first and second thermoplastic polyurethane compositions in respective extruders with 1.24 inch single screw and an L/D of 24, and extruding the melts using two feeding systems/conduits by a melt pump and then to a spinneret or die.
• the back pressure at the extruder outlet was kept constant with a loop control.
• the extruder had four heating zones that were maintained between 180°C - 220°C.
• the basic system consists of two feeding systems, two polymers to the spin packs and a distribution system to meter both polymers to the die.
• spinneret for producing bicomponent or multicomponent filaments is known in the industry. Such a pro cess is described in US Patent No. 5, 162,074, which is incorporated herein by reference.
• spinneret includes a casing containing spin packs, plurality of plates to create a pattern for polymer to flow.
• the bicomponent continuous filament spinnerets may also be configured for extrudate to have desired cross-sections such as symmetrical (concentric) core/sheath, asymmetrical core/sheath, side-by-side, crescent shaped and the like. Addition ally, multiple extruders can be added to increase the number of components. [0020] Once the fiber exits the spinneret, it is cooled before winding onto bobbins. The fiber is passed over a set of godets, finish oil is applied, and the fiber proceeds to another set of godets.
• the thermoplastic polyu rethane described above may be crosslinked with a crosslinking agent.
• Crosslinking agents are generally a pre-polymer of a hydroxyl terminated intermediate that is a polyether, poly ester, polycarbonate, polycaprolactone, or mixture thereof reacted with a polyisocyanate.
• Crosslinking agents also referred to as pre-polymers in some cases, often will have an iso cyanate functionality of greater than about 1.0, preferably from about 1.0 to about 3.0, and more preferably from about 1.8 to about 2.2.
• bicomponent fiber is formed without the use of crosslinking agents.
• both the core thermoplastic polyurethane and the sheath thermoplastic polyurethane are free of crosslinking.
• the bicomponent fibers of this invention can be made in a variety of denier. Denier is a term in the art designating the fiber size. Denier is the weight in grams of 9000 meters of fiber length.
• the bicomponent fibers of this invention are typically made in sizes ranging from, 20 to 2500 denier, for example 20 to 600 denier, further for example 40 to 400 denier.
• anti-tack additives such as finish oils, an example of which are silicone oils, are usually added to the surface of the fibers after or during cooling and just prior to being wound into bobbins.
• a bicomponent fiber in accordance with the present invention has a core and sheath structure, wherein the bicomponent fiber has a core comprising a first polyester ther moplastic polyurethane, wherein the first polyester thermoplastic polyurethane has a melting enthalpy of at least about 50 J/g, for example, about 60 J/g, measured according to ASTM D3418 (DSC, second heat cycle) and a sheath comprising a second polyester thermoplastic polyurethane, wherein the second polyester thermoplastic polyurethane has a melting en thalpy of about 5 J/g or less measured according to ASTM D3418 (DSC, second heat cycle).
• the first polyester thermoplastic polyurethane has a contact clarity of 4% or less as measured according to ASTM D1003.
• the second polyester thermoplastic polyurethane has a contact clarity of at least 12% measured according to ASTM D1003.
• the bicomponent fiber of the present invention contains a core thermoplastic pol yurethane and a sheath thermoplastic polyurethane, where the core and the sheath thermo plastic polyurethane materials are different from each other.
• the core thermoplastic polyurethane comprises the reaction product of butanediol succinate and an aromatic diisocyanate while the sheath thermoplastic polyurethane comprises the reaction product of butanediol adipate, an aromatic diisocyanate, and at least one chain extender glycol.
• the bicomponent fiber comprises about 10% to about 35% by weight of the core thermoplastic polyurethane composition and about 65% to about 90% by weight of the second thermoplastic polyurethane.
• the final bicomponent fiber has low shrinkage and good clarity.
• the present inven tion provides these properties surprisingly by combining two different thermoplastic polyu rethane materials having different shrinkage and clarity properties.
• the core comprises a thermoplastic polyurethane composition having a melting enthalpy of at least 50J/g measured according to ASTM D3418 and a contact clarity of about 4% or less as measured according to ASTM D1003 and the sheath comprises a thermoplastic polyurethane composition having a melting enthalpy of about 5 I/g or less measured according to ASTM D3418 (DSC, second heat cycle) and a contact clarity of at least 12% measured according to ASTM D1003.
• the core thermoplastic polyurethane has a shrinkage of less than about 10% after 90 seconds exposure at 70 °C, while the sheath thermoplastic polyurethane has a shrinkage of about 40% to about 60% after 90 seconds exposure at 70 °C.
• the present invention also includes a fabric comprising the bicomponent fiber of the present invention.
• the fabric comprises a bicomponent fiber, wherein the bicomponent fiber has a core and sheath structure, wherein the core comprises a thermo plastic polyurethane composition having a melting enthalpy of at least about 50 J/g, for ex ample about 60 J/g, measured according to ASTM D3418 (DSC, second heat cycle) and a contact clarity of 4% or less as measured according to ASTM D1003 and the sheath com prises a thermoplastic polyurethane composition having a melting enthalpy of about 5 J/g or less measured according to ASTM D3418 (DSC, second heat cycle) and a contact clarity of at least about 12% measured according to ASTM D1003.
• the core comprises a thermo plastic polyurethane composition having a melting enthalpy of at least about 50 J/g, for ex ample about 60 J/g, measured according to ASTM D3418 (DSC, second heat cycle) and a contact clarity of 4% or less as measured according to ASTM D1003
• the core thermoplastic polyurethane composition has a shrinkage of less than about 10% after 90 seconds exposure at 70 °C and the sheath thermoplastic polyurethane composition has a shrinkage of about 40% to about 60% after 90 seconds exposure at 70 °C.
• the bicomponent fiber comprises a core to sheath ratio of 10:90 to 35:65. 5.
• the fabric of the present invention comprises a bicompo nent fiber that has a shrinkage after 90 seconds of exposure at 70 °C of less than about 20% and a contact clarity measured according to ASTM D1003 of greater than about 13%.
• the bicomponent fiber used in the fabric may also have a melting range of 100 °C to 120 °C measured by DSC.
• Fabric made using the fibers of this invention can be made by knitting or weaving.
• fabrics can be made by using the bicomponent fibers of the present invention with other fibers, such as nylon and/or polyester.
• the fabrics of the present inven tion may be used to make garments, such as for sports apparel applications.
• the enhanced clarity of the fibers of the present invention also provides benefits for applications where graphics are applied to the fabrics.
• TPU 1 is a polyester thermoplastic polyurethane comprising the reaction product of bu- tanediol succinate and an aromatic diisocyanate having a melt enthalpy measured by DSC, second heat cycle of 60 J/g.
• TPU 2 is a polyester thermoplastic polyurethane comprising the reaction product of butanediol adipate, an aromatic diisocyanate, and a chain extender diol having a melt enthalpy measured by DSC, second heat cycle of 5 J/g.
• Comparative Examples Cl - C9 were made from either 100% of one TPU material or blends of pellets of TPU 1 and TPU 2 to form a mono-component filament.
• Inventive Examples 1-4 are bicomponent fibers having a core-sheath cross section. When fibers were able to be successfully made, these were tested for shrinkage using a one meter length of fiber that was measured before and after exposure to a temperature of 70 °C for 90 seconds.
• transitional term“comprising,” which is synonymous with “including,”“containing,” or“characterized by,” is inclusive or open-ended and does not exclude additional, un-recited elements or method steps.
• the term also encompass, as alternative embodiments, the phrases“consisting essentially of’ and“consisting of,” where“consisting of’ excludes any element or step not specified and“consisting essentially of’ permits the inclusion of additional un-recited elements or steps that do not materially affect the essential or basic and novel characteristics of the composition or method under consideration.

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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)
• Multicomponent Fibers (AREA)
• Knitting Of Fabric (AREA)
• Woven Fabrics (AREA)

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• 2020
  • 2020-07-01 US US17/623,955 patent/US20220411970A1/en active Pending
  • 2020-07-01 WO PCT/US2020/040447 patent/WO2021003236A1/en unknown
  • 2020-07-01 JP JP2021578016A patent/JP2022538459A/ja active Pending
  • 2020-07-01 EP EP20743924.1A patent/EP3994299A1/de active Pending
  • 2020-07-01 KR KR1020227001797A patent/KR20220027161A/ko unknown
  • 2020-07-02 TW TW109122344A patent/TW202111175A/zh unknown

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