WO2006105225A1 - Porcede d'elimination du phosphore d'une fibre ou d'un fil - Google Patents

Porcede d'elimination du phosphore d'une fibre ou d'un fil Download PDF

Info

Publication number
WO2006105225A1
WO2006105225A1 PCT/US2006/011513 US2006011513W WO2006105225A1 WO 2006105225 A1 WO2006105225 A1 WO 2006105225A1 US 2006011513 W US2006011513 W US 2006011513W WO 2006105225 A1 WO2006105225 A1 WO 2006105225A1
Authority
WO
WIPO (PCT)
Prior art keywords
yarn
acid
fiber
washing
polymer
Prior art date
Application number
PCT/US2006/011513
Other languages
English (en)
Inventor
Steven R. Allen
Doetze Jakob Sikkema
Original Assignee
E. I. Du Pont De Nemours And Company
Magellan Systems International, Llc
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 E. I. Du Pont De Nemours And Company, Magellan Systems International, Llc filed Critical E. I. Du Pont De Nemours And Company
Priority to JP2008504320A priority Critical patent/JP4769290B2/ja
Priority to US11/909,670 priority patent/US7888457B2/en
Priority to DE602006019564T priority patent/DE602006019564D1/de
Priority to EP06748888A priority patent/EP1863956B1/fr
Priority to KR1020077024744A priority patent/KR101337734B1/ko
Priority to AT06748888T priority patent/ATE495287T1/de
Priority to CN2006800098253A priority patent/CN101218384B/zh
Publication of WO2006105225A1 publication Critical patent/WO2006105225A1/fr

Links

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
    • D01F13/00—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like
    • 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
    • D01F6/74—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polycondensates of cyclic compounds, e.g. polyimides, polybenzimidazoles

Definitions

  • the present invention generally relates to polymer fibers and processes for the preparation of such fibers. More particularly , the present invention relates to methods of removing polyphosphoric acid, inter alia, from filaments and spun yarns comprising polymers.
  • Sen et al. US 5,393,478, discloses a process for leaching polyphosphoric acid from the polybenzazole dope filament by contacting with a leaching fluid at a temperature of at least about 60°C.
  • Sen et al. US 5,525,638, discloses a process for washing polyphosphoric acid from the polybenzazole dope filament by using multiple washes, typically at about room temperature, slowly reducing phosphorous concentration from the spun fiber, allegedly to improve the physical properties of the resultant polymeric fiber.
  • the present invention is directed, in part, to processes for removing polyphosphoric acid from a fiber, comprising the steps of heating a fiber comprising polymer and polyphosphoric acid to at least 120 degrees Celsius (" 0 C") for a time effective to hydrolyze polyphosphoric acid; and in a separate step, removing hydrolyzed polyphosphoric acid from the fiber with a fluid having a temperature of 100 0 C or less.
  • the present invention is also directed, in part, to processes for hydrolyzing polyphosphoric acid in a fiber, comprising the step of heating a fiber comprising polymer and polyphosphoric acid in an acidic medium having a pH less than 4.0 to a temperature above 100 0 C for a time effective to hydrolyze polyphosphoric acid.
  • the invention is also directed, in part, to processes for hydrolyzing polyphosphoric acid in a polyareneazole polymeric material, comprising the steps of providing a polymeric material comprising polyareneazole and polyphosphoric acid, wherein at least 50 mole percent of the polyareneazole repeating unit structures comprise 2,5-dihydroxy-p-phenylene moieties; and heating the polymeric material to more than 100 0 C to hydrolyze at least a portion of polyphosphoric acid.
  • the invention is further directed, in part, to processes for removing phosphorus from a yarn spun from a polymer solution containing polyphosphoric acid, the yarn comprising at least about 1.5 percent by weight of the yarn of phosphorous, comprising contacting the yarn with a base and washing the yarn with an aqueous fluid.
  • the invention also provides fibers comprising polyareneazole polymer having pendant hydroxyl groups and at least 2 percent based on fiber weight of cations including sodium, potassium, or calcium, or any combination thereof.
  • the present invention is also directed, in part, to processes for removing cations from a polyareneazole fiber, comprising the steps of providing a fiber comprising a polyareneazole polymer having pendant hydroxyl groups and at least 2 percent by weight of cations, contacting the fiber with an aqueous solution containing acid to release at least a portion of the cations, and, optionally, washing the fiber with water.
  • Figure 1 is a schematic diagram of a polyarenezole fiber production process. DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS
  • Filaments of the present invention can be made from polyareneazole polymer.
  • polyareneazole refers to polymers having either: one hetero aromatic ring fused with an adjacent aromatic group (Ar) of repeating unit structure (a):
  • N is a nitrogen atom and Z is a sulfur, oxygen, or NR group wherein R is hydrogen or a substituted or unsubstituted alkyl or aryl attached to N; or two hetero aromatic rings each fused to a common aromatic group (Ar 1 ) of either of the repeating unit structures (bl or b2):
  • polystyreneazole polymers include polybenzazole polymers or polypyridazole polymers or both. In certain embodiments, the polybenzazole polymers comprise polybenzimidazole or polybenzobisimidazole polymers.
  • the polypyridazole polymers comprise polypyridobisimidazole or polypyridoimidazole polymers.
  • the polymers are of a polybenzobisimidazole or polypyridobisimidazole type. ⁇ 0017] M 1 te1!rtifcturd"(t ⁇ l ; )'Md"( t b2), Y is an aromatic, heteroaromatic, aliphatic group, or nil; preferably an aromatic group; more preferably a six-membered aromatic group of carbon atoms. Still more preferably, the six-membered aromatic group of carbon atoms (Y) has para- oriented linkages with two substituted hydroxyl groups; even more preferably 2,5-dihydroxy- /> ⁇ ra-phenylene .
  • Ar and Ar 1 each represent any aromatic or heteroaromatic group.
  • the aromatic or heteroaromatic group can be a fused or non-fused polycyclic system, but is preferably a single six-membered ring.
  • the Ar or Ar 1 group is preferably heteroaromatic, wherein a nitrogen atom is substituted for one of the carbon atoms of the ring system or Ar or Ar 1 may contain only carbon ring atoms. Still more preferably, the Ar or Ar 1 group is heteroaromatic.
  • polybenzazole refers to polyareneazole polymer having repeating structure (a), (bl), or (b2) wherein the Ar or Ar 1 group is a single six-membered aromatic ring of carbon atoms.
  • polybenzazoles are a class of rigid rod polybenzazoles having the structure (bl) or (b2); more preferably rigid rod polybenzazoles having the structure (bl) or (b2) with a six-membered carbocyclic aromatic ring Ar 1 .
  • the polybenzazole is a polybenzimidazole, preferably it is poly(benzo[l,2-d:4,5-d']bisimidazole- 2,6-diyl-l,4-phenylene.
  • the polybenzazole is a polybenzthiazole, preferably it is poly(benzo[l,2-d:4,5-d']bisthiazole-2,6-diyl-l,4-phenylene.
  • the polybenzazole is a polybenzoxazole, preferably it is poly(benzo[l,2-d:4,5-d']bisoxazole-2,6-diyl-l,4-phenylene.
  • polypyridazole refers to polyareneazole polymer having repeating structure (a), (bl), or (b2) wherein the Ar or Ar 1 group is a single six-membered aromatic ring of five carbon atoms and one nitrogen atom.
  • these polypyridazoles are a class of rigid rod polypyridazoles having the structure (bl) or (b2), more preferably rigid rod polypyridazoles having the structure (bl) or (b2) with a six-membered heterocyclic aromatic ring Ar 1 .
  • the number of repeating structures or units represented by structures is not critical.
  • each polymer chain has from 10 to 25,000 repeating units.
  • Filaments of the present invention are prepared from polybenzazole (PBZ) or polypyridazole polymers.
  • PBZ polybenzazole
  • filament or “fiber” refers to a relatively flexible, macro scopically homogeneous body having a high ratio of length to width across its cross-sectional area perpendicular to its length.
  • the filament cross section may be any shape, but is typically circular.
  • “yarn” refers to a number of filaments laid, bundled, or assembled together with or without a degree of twist or interlacing, forming a continuous strand, which can be used, for example, in weaving, knitting, plaiting, or braiding, wherein fiber is as defined hereinabove.
  • fabric refers to any woven, knitted, or non-woven structure.
  • woven is meant any fabric weave, such as, plain weave, crowfoot weave, basket weave, satin weave, twill weave, and the like.
  • knitted is meant a structure produced by interlooping or intermeshing one or more ends, fibers or multifilament yarns.
  • non-woven is meant a network of fibers, including unidirectional fibers, felt, and the like.
  • coagulation bath refers to a medium provided to coagulate the dope filament.
  • the bath comprises a liquid, typically an alcohol, water, aqueous acid, or other aqueous liquid mixture.
  • the bath is water or aqueous phosphoric acid, but the liquid may be anything that provides water or other moiety that may assist in the hydrolysis of PPA.
  • the more preferred rigid rod polypyridazoles include, but are not limited to polypyridobisimidazole homopolymers and copolymers such as those described in U.S. Patent 5,674,969 (to Sikkema, et al. on Oct. 7 1997).
  • polypyridobisimidazole is homopolymer poly(l,4-(2,5-dihydroxy) phenylene-2,6-diimidazo[4,5- b:4'5'-e]pyridinylene).
  • the polyareneazole polymers used in this invention may have properties associated with a rigid-rod structure, a semi-rigid-rod structure, or a flexible coil structure; pref ⁇ fabiy'a-'riSydWditoctlbrd 1 "Wneri"this class of rigid rod polymers has structure (bl) or (b2) it preferably has two azole groups fused to the aromatic group Ar 1 .
  • Suitable polyareneazoles useful in this invention include homopolymers and copolymers. Up to as much as 25 percent, by weight, of other polymeric material can be blended with the polyareneazole. Also copolymers may be used having as much as 25 percent or more of other polyareneazole monomers or other monomers substituted for a monomer of the majority polyareneazole. Suitable polyareneazole homopolymers and copolymers can be made by known procedures, such as those described in U.S. Patents 4,533,693 (to Wolfe et al. on Aug. 6, 1985), 4,703,103 (to Wolfe et al. on Oct.
  • Additives may also be incorporated in the polyareneazole in desired amounts, such as, for example, anti-oxidants, lubricants, ' ultra-violet screening agents, colorants and the like.
  • This invention is generally directed to polyareneazole filaments, more specifically to polybenzazole (PBZ) filaments or polypyridazole filaments, and processes for the preparation of such filaments.
  • PBZ polybenzazole
  • the invention further relates to yarns, fabrics, and articles incorporating filaments of this invention, and processes for making such yarns, fabrics, and articles.
  • the present invention is directed to processes for removing polyphosphoric acid from a fiber, comprising the steps of heating a fiber comprising polymer and polyphosphoric acid typically to at least 120°C for a time effective to hydrolyze polyphosphoric acid; and in a separate step, removing hydrolyzed polyphosphoric acid from the fiber with a fluid having a temperature of 100°C or less.
  • the time effective to hydrolyze polyphosphoric acid is up to about 120 seconds.
  • the step of heating a fiber may include convective heating, radiant heating, radiation heating, RF heating, conductive heating, steam heating, or any combination thereof.
  • the polymer comprises a polyareneazole; more preferably wherein the polyareneazole is a polypyridazole.
  • the polyareneazole is a polypyridobisimidazole; more preferably poly(l,4-(2,5-dihydroxy) phenylene-2,6-diimidazo[4,5- b:4'5'-e]pyridinylene).
  • the polyareneazole is a polybenzazole, and more preieraoiy ⁇ a ⁇ poi ⁇ yDenz ⁇ Diso ⁇ az ⁇ -ie.
  • removing hydrolyzed polyphosphoric acid includes washing the fiber with a base; more preferably, the fiber is washed with water prior to and after washing with the base.
  • the base must be selected to be strong enough to break a bond between the polymer and the phosphoric acid and typically includes sodium hydroxide, potassium hydroxide, ammonium hydroxide, sodium bicarbonate, or any combination thereof, preferably sodium hydroxide, potassium hydroxide, or any combination thereof.
  • removing hydrolyzed polyphosphoric acid includes washing the fiber with a base and subsequent washing with acid.
  • the steps of cooling the fiber to less than 60 0 C and removing hydrolyzed polyphosphoric acid from the fiber occur simultaneously.
  • the fluid used to remove hydrolyzed polyphosphoric acid has a temperature of about 60 0 C or less.
  • fiber comprising polymer and polyphosphoric acid is typically heated in an acidic medium having a pH less than 4.0 to a temperature above 100 0 C for a time effective to hydrolyze polyphosphoric acid.
  • the time effective to hydrolyze polyphosphoric acid is up to about 120 seconds.
  • the acidic medium comprises up to about 80% phosphoric acid by weight.
  • the acidic medium more typically has a pH less than 3.0, and preferably less than 2.0.
  • the acidic medium preferably comprises boiling phosphoric acid having a temperature less than 14O 0 C.
  • the process further comprises the step of removing hydrolyzed polyphosphoric acid from the fiber.
  • the polymer remains substantially non-hydrolyzed after hydrolyzing the polyphosphoric acid.
  • the polymer “remains substantially non-hydrolyzed”, it is meant that the polymer inherent viscosity is not materially affected by the process.
  • the present invention is directed to processes for hydrolyzing polyphosphoric acid in a polyareneazole polymeric material, comprising the steps of a) providing a polymeric material comprising polyareneazole and polyphosphoric acid, wherein at least 50 mole percent of the polyareneazole repeating unit structures comprise 2,5-dihydroxy- /? ⁇ r ⁇ -phenylene moieties; and b) typically heating the polymeric material to more than 100 0 C to hydrolyze at least a portion of polyphosphoric acid. More typically, the process further comprises the step of removing hydrolyzed polyphosphoric acid from the polymeric material.
  • the invention is directed to processes for removing phosphorus from a yarn spun from a polymer solution containing polyphosphoric acid, the yarn comp'r ⁇ smg atlea'MWotit weight of the yarn of phosphorus, comprising typically contacting the yarn with a base and washing the yarn with an aqueous fluid, hi certain embodiments, the phosphorus content of the yarn prior to contacting the yarn with the base is typically in the range of from 2 to 20 percent based on yarn weight, more typically the phosphorus content is in the range of 4 to 15 percent based on yarn weight. In some embodiments, contacting the yarn with the base includes spraying, coating, flowing, drawing, dipping, or any combination thereof.
  • the base contacting the yarn includes sodium hydroxide, potassium hydroxide, ammonium hydroxide, sodium bicarbonate, or any combination thereof.
  • the aqueous fluid typically used in washing the yarn contains an acid, more typically a volatile acid.
  • volatile acids include formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, pivalic acid, or any combination thereof.
  • the volatile acid is acetic or propionic acid.
  • the polymer comprises a polyareneazole.
  • the polyareneazole is a polypyridazole; more preferably a polypyridobisimidazole.
  • the polyareneazole is poly(l,4-(2,5-dihydroxy) phenylene-2,6-diimidazo[4,5- b:4'5'-e]pyridinylene).
  • the polyareneazole is a polybenzazole, more typically a polybenzobisoxazole.
  • the yarn typically contains ⁇ 0.1 percent phosphorus based on yarn weight after washing with the aqueous fluid.
  • the yarn is provided, in certain embodiments, by heating a spun multifilament yarn comprising the polymer and polyphosphoric acid to at least 120°C for a time effective to hydrolyze polyphosphoric acid, preferably up to about 600 seconds, more preferably up to about 120 seconds.
  • the base used in contacting the yarn is aqueous sodium hydroxide, or the aqueous washing fluid contains acetic acid, or both.
  • the duration of the contacting step with base is typically no more than 30 seconds, preferably 20 seconds or less.
  • the duration of the washing step with aqueous fluid is no more than 30 seconds, preferably 20 seconds or less.
  • the step of contacting the yarn with a base begins before the step of washing the yarn with an aqueous fluid.
  • the invention is directed to fibers comprising polyareneazole polymer having pendant hydroxyl groups and at least 2 percent based on fiber weight of cations including sodium, potassium, or calcium, or any combination thereof.
  • the polyareneazole is typically a polypyridazole, preferably a polypyridobisimidazole.
  • the polypyridobisimidazole is poly(l,4-(2,5- ⁇ ph'fenyieiie w 2yG-e ; iii : niEiQi- ⁇ pi i ,D-b:4'5'-e]pyridmylene).
  • the polyareneazole is a polybenzazole, typically a polybenzobisoxazole.
  • the fiber typically contains greater than 2 percent based on fiber weight of sodium. In still other embodiments, the fiber contains typically greater than 3 percent based on fiber weight of the cations. In certain embodiments, the fiber contains greater than 3 percent based on fiber weight of sodium.
  • the invention is directed to a process for removing cations from a polyareneazole fiber, comprising the steps of a) providing a fiber comprising a polyareneazole polymer having pendant hydroxyl groups, and at least 2 percent by weight of cations, b) contacting the fiber with an aqueous solution containing acid to release at least a portion of the cations, and c) optionally, washing the fiber with water.
  • the acid is more typically a volatile acid.
  • Suitable, non-limiting examples of volatile acids include formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, pivalic acid, or any combination thereof; preferably acetic acid, propionic acid, or any combination thereof.
  • the aqueous solution typically contains from about 0.1 to about 10 percent by weight acid.
  • the cations being removed from polyareneazole fibers include sodium, potassium, calcium, or any combination thereof. Contacting the fiber with the aqueous solution typically includes spraying, coating, flowing, drawing, dipping, or any combination thereof.
  • the contacting step may be shorter or longer depending on the specific polymer or fiber, typically the duration of the contacting step is up to about 30 seconds, preferably up to about 20 seconds or less.
  • the optional washing step time may not be critical , but typically the duration of the optional washing step is up to about 30 seconds, preferably up to about 20 seconds or less.
  • the fiber contains up to about 0.1 percent cations based on fiber weight after the steps of contacting the fiber with an aqueous solution containing acid, and optionally washing the fiber with water, preferably up to about 0.05 percent cations based on fiber weight.
  • the fiber further comprises at least about 0.1 percent phosphorus based on fiber weight prior to contacting the fiber with the aqueous solution, more typically at least about 1 percent phosphorus based on fiber weight prior to contacting the fiber with the aqueous solution.
  • the polyareneazole is a polypyridazole, typically a polypyridobisimidazole.
  • the polypyridobisimidazole is poly(l,4-(2,5-dihydroxy) phenylene-2,6-diimidazo[4,5-b:4'5'- e]pyridinylene).
  • the polyareneazole is a polybenzazole, preferably a polybenzobisoxazole.
  • Suitable poiyareneazoie monomers are reacted in a solution of non-oxidizing and dehydrating acid under non-oxidizing atmosphere with mixing at a temperature that is increased in step-wise or ramped fashion from no more than about 120 0 C to at least about 170°C.
  • the polyareneazole polymer can be rigid rod, semi-rigid rod or flexible coil. It is preferably a lyotropic liquid-crystalline polymer, which forms liquid-crystalline domains in solution when its concentration exceeds a critical concentration.
  • the inherent viscosity of rigid polyareneazole polymers in methanesulfonic acid at 30°C is preferably at least about 10 dL/g, more preferably at least about 15 dL/g and most preferably at least about 20 dL/g.
  • the polymer is formed in acid solvent providing the dope solution 2.
  • the polymer is dissolved in the acid solvent after formation. Either is within the ambit of the invention.
  • the polymer is formed in acid solvent and provided for use in the invention.
  • the dope solution 2, comprising polymer and polyphosphoric acid typically contains a high enough concentration of polymer for the polymer to form an acceptable filament 6 after extrusion and coagulation.
  • the concentration of polymer in the dope 2 is preferably high enough to provide a liquid-crystalline dope.
  • the concentration of the polymer is preferably at least about 7 weight percent, more preferably at least about 10 weight percent and most preferably at least about 14 weight percent.
  • the maximum concentration is typically selected primarily by practical factors, such as polymer solubility and dope viscosity.
  • the concentration of polymer is preferably no more than 30 weight percent, and more preferably no more than about 20 weight percent.
  • the polymer dope solution 2 may contain additives such as anti-oxidants, lubricants, ultra-violet screening agents, colorants and the like which are commonly incorporated.
  • the polymer dope solution 2 is typically extruded or spun through a die or spinneret 4 to prepare or spin the dope filament.
  • the spinneret 4 preferably contains a plurality of holes. The number of holes in the spinneret and their arrangement is not critical to the invention, but it is desirable to maximize the number of holes for economic reasons.
  • the spinneret 4 can contain as many as 100 or 1000 or more holes, and they may be arranged in circles, grids, or in any other desired arrangement.
  • the spinneret 4 may be constructed out of any materials that will not be degraded by the dope solution 2.
  • Fibers may be spun from solution using any number of processes, however, wet spinning and "air-gap" spinning are the best known.
  • the general arrangement of the spinnerets and baths for these spinning processes is well known in the art, with the figures in U.S. Patent Nos?-3$22f ,79$S ⁇ 31 1 4f4,645r 11 3 ⁇ 6?,7''56f and 5,667,743 being illustrative of such spinning processes for high strength polymers.
  • air-gap the spinneret typically extrudes the fiber first into a gas, such as air.
  • dope solution 2 exiting the spinneret 4 enters a gap 8 (typically called an "air gap” although it need not contain air) between the spinneret 4 and a coagulation bath 10 for a very short duration of time.
  • the gap 8 may contain any fluid that does not induce coagulation or react adversely with the dope, such as air, nitrogen, argon, helium, or carbon dioxide.
  • the extruded dope 6 is drawn across the air gap 8, with or without stretching and immediately introduced into a liquid coagulation bath. Alternately, the fiber may be "wet-spun”.
  • the spinneret In wet spinning, the spinneret typically extrudes the fiber directly into the liquid of a coagulation bath and normally the spinneret is immersed or positioned beneath the surface of the coagulation bath. Either spinning process may be used to provide fibers for use in the processes of the invention. In some embodiments of the present invention, air-gap spinning is preferred.
  • the extruded dope 6 is "coagulated" in the coagulation bath 10 containing water or a mixture of water and phosphoric acid, which removes enough of the polyphosphoric acid to prevent substantial stretching of the extruded dope 6 during any subsequent processing. If multiple fibers are extruded simultaneously, they may be combined into a multifilament yarn before, during or after the coagulation step.
  • the term "coagulation” as used herein does not necessarily imply that the extruded dope 6 is a flowing liquid and changes into a solid phase.
  • the extruded dope 6 can be at a temperature low enough so that it is essentially non-flowing before entering the coagulation bath 10.
  • the coagulation bath 10 does ensure or complete the coagulation of the filament, i.e., the conversion of the polymer from a dope solution 2 to a substantially solid polymer filament 12.
  • the amount of solvent, i e., polyphosphoric acid, removed during the coagulation step will depend on the residence time of the dope filament in the coagulation bath, the temperature of the bath 10, and the concentration of solvent therein.
  • the present invention is, in part, based on the discovery that long term fiber properties are better preserved if residual phosphorus levels are low. In part, this may be achieved by hydrolyzing PPA prior to its removal from the fiber in the belief that substantially hydrolyzed polyphosphoric acid may be effectively removed from the fiber to achieve low residual phosphorus. Typically, PPA is substantially hydrolyzed under conditions whereby the fiber remains substantially non-hydrolyzed.
  • PPA may be conv'e ' i ⁇ ieritly Rf d ⁇ 'dly ⁇ fid' b'f-hfeatitag'tll'e filament or yarn prior to washing and/or neutralization steps.
  • One manner of hydrolysis includes convective heating of the coagulated fiber for a short period of time.
  • the hydrolysis may be effected by heating the wet, as coagulated filament or yarn in a boiling water or aqueous acid solution.
  • the heat treatment provides PPA hydrolysis while adequately retaining the tensile strength of the product fiber.
  • the heat treatment step may occur in a separate cabinet 14, or as an initial process sequence followed by one or more subsequent washing steps in an existing washing cabinet 14.
  • the hydrolysis and removal are provided by (a) contacting the dope filament with a solution in bath or cabinet 14 thereby hydrolyzing PPA and then (b) contacting the filament with a neutralization solution in bath or cabinet 16 containing water and an effective amount of a base under conditions sufficient to neutralize sufficient quantities of the phosphoric acid, polyphosphoric acid, or any combination thereof in the filament.
  • hydrolyzed PPA may be removed from the filament or yarn 12 by washing in one or more washing steps to remove most of the residual acid solvent/and or hydrolyzed PPA from the filament or yarn 12.
  • the washing of the filament or yarn 12 may be carried out by treating the filament or yarn 12 with a base, or with multiple washings where the treatment of the filament or yarn with base is preceded and/or followed by washings with water.
  • the filament or yarn may also be treated subsequently with an acid to reduce the level of cations in the polymer. This sequence of washings may be carried out in a continuous process by running the filament through a series of baths and/or through one or more washing cabinets.
  • FIG. 1 depicts one washing bath or cabinet 14.
  • Washing cabinets typically comprise an enclosed cabinet containing one or more rolls which the filament travels around a number of times, and across, prior to exiting the cabinet. As the filament or yarn 12 travels around the roll, it is sprayed with a washing fluid. The washing fluid is continuously collected in the bottom of the cabinet and drained therefrom.
  • the temperature of the washing fluid(s) impacts on the diffusion rates controlling the washing process, making the temperature selection a matter of practical importance. Preferably, temperatures between 20 and 90 C are used, depending on the residence time desired.
  • the washing fluid may be applied in vapor form (steam), but is more conveniently provided in liquid form.
  • a number of washing baths or cabinets are used.
  • the residence time of the filament or yarn 12 in any one washing bath or cabinet 14 will depend on the desired concentration of residual phosphorus in the filament or yarn 12, but preferably the resid'St ⁇ ee tir ⁇ d-.M' ⁇ tii-tli'i'p ⁇ ige-M-lreiiitfiabout 1 second to less than about two minutes.
  • the duration of the entire washing process in the preferred multiple washing bath(s) and/or cabinet(s) is preferably no greater than about 10 minutes, more preferably more than about 5 seconds and no greater than about 160 seconds.
  • preferred bases for the removal of hydrolyzed PPA include NaOH; KOH; Na 2 CO 3 ; NaHCO 3 ; K 2 CO 3 ; KHCO 3 ; ammonia; or trialkylamines, preferably tributylamine; or mixtures thereof.
  • the base is water soluble.
  • Typical aqueous bases include NaOH, KOH, Na 2 CO 3 , NaHCO 3 , K 2 CO 3 , and KHCO 3 or mixtures thereof; more typically NaOH.
  • the process may optionally include the step of contacting the filament with a washing solution containing water or acid or both to remove all or substantially all excess base or base cations otherwise bound or associated with the polymer fiber.
  • This washing solution can be applied in a washing bath or cabinet 18.
  • the fiber or yarn 12 may be dried in a dryer 20 to remove water and other liquids.
  • the temperature in the dryer is typically 8O 0 C to 130 0 C.
  • the dryer residence time is typically 5 seconds to perhaps as much as 5 minutes at lower temperatures.
  • the dryer can be provided with a nitrogen or other non-reactive atmosphere.
  • the fiber may be optionally further processed in, for instance, a heat setting device 22. Further processing may be done in a nitrogen purged tube furnace 22 for increasing tenacity and/or relieving the mechanical strain of the molecules in the filaments.
  • the filament or yarn 12 is wound up into a package on a windup device 24. Rolls, pins, guides, and/or motorized devices 26 are suitably positioned to transport the filament or yarn through the process.
  • Shaped articles as described herein include extruded or blown shapes or films, molded articles, and the like.
  • Films can be made by known techniques such as (1) casting the dope onto a flat surface, (2) extruding the dope through an extruder to form a film, or (3) extruding and blowing the dope film to form an extruded blown film.
  • Typical techniques for dope film extrusion include processes similar to those used for fibers, where the solution passes through a spinneret or die into an air gap or fluid layer and subsequently into a coagulant bath. More details describing the extrusion and orientation of dope films can be found in Pierini et al. (U. S. Pat. No.
  • the dope film prepared is preferably no more than about 250 mils (6.35 mm) thick and more preferably it is at most about 100 mils (2.54 mm) thick.
  • the phosphorus content of the dried filaments after removal of the hydrolyzed PPA is less than about 5,000 ppm (0.5 %) by weight, and more preferably, less than abo ⁇ 'f 4;0(K>ptMi ;: p4 %)''by ⁇ i ; ihf a ⁇ id most preferably less than about 2,000 ppm (0.2 %) by weight.
  • the invention is further directed, in part, to a yarn comprising a plurality of the filaments of the present invention, fabrics that include filaments or yarns of the present invention, and articles that include fabrics of the present invention.
  • Denier is determined according to ASTM D 1577 and is the linear density of a fiber as expressed as weight in grams of 9000 meters of fiber.
  • Tenacity is determined according to ASTM D 885 and is the maximum or breaking stress of a fiber as expressed as grams per denier.
  • Elemental analysis of alkaline cation (M) and phosphorus (P) is determined according to the inductively coupled plasma (ICP) method as follows.
  • a sample (1-2 grams), accurately weighed, is placed into a quartz vessel of a CEM Star 6 microwave system. Concentrated sulfuric acid (5 ml) is added and swirled to wet.
  • a condenser is connected to the vessel and the sample is digested using the moderate char method. This method involves heating the sample to various temperatures up to 260°C to char the organic material. Aliquots of nitric acid are automatically added by the instrument at various stages of the digestion. The clear, liquid final digestate is cooled to room temperature and diluted to 50 ml with deionized water.
  • the solution may be analyzed on a Perkin Elmer optima inductively coupled plasma device using the manufacturers' recommended conditions and settings. A total of twenty-six different elements may be analyzed at several different wavelengths per sample. A 1/10 dilution may be required for certain elements such as sodium and phosphorus. Calibration standards are from 1 to 10 ppm.
  • Example A shows typical levels of P in fibers when no purposeful removal in undertaken.
  • Example B illustrates the difficulty of washing PPA from wet yarns using traditional washings with water.
  • Example C illustrates the acid level believed to be a preferred higher acid concentration limit when treating PIPD fibers. At levels above this in certain embodiments, the fibers may begin to disintegrate.
  • Example D illustrates the difficulty of washing PPA from wet yarns using traditional washings with boiling water.
  • Examples E-K show the benefits of carrying out a heat treatment step to hydrolyze residual polyphosphoric acids combined with washing of the fiber or yarn.
  • This example illustrates the difficulty of washing PPA from wet yarns using traditional washings with water.
  • a solution of PIPD polymer and polyphosphoric acid having 81.6 wt % P 2 O 5 was spun into fibers using a 250 hole spinneret.
  • the wet as-coagulated yarn was allowed to air dry and was then analyzed for phosphorus.
  • the sample was found to contain a very high level of phosphorus (63400 ppm) along with 175 ppm sodium.
  • a sample of the wet, as-coagulated PIPD yarn was then soaked in fresh water at room temperature for 5 minutes.
  • the yarn sample was then rinsed for 20 seconds in fresh water, was allowed to air dry, and was then analyzed for phosphorus.
  • the sample was found to contain 58500 ppm phosphorus and 453 ppm sodium.
  • a solution of PIPD polymer and polyphosphoric acid having 82.5 wt % P 2 O 5 was spun into fibers using a 250 hole spinneret.
  • the wet as-coagulated yarn was gently boiled in water at 100 0 C for a period of 20 minutes.
  • This yarn sample was then rinsed in fresh water for 10 seconds and allowed to air dry. The sample was found to contain 44500 ppm phosphorus and 1000 ppm sodium.
  • a solution of PIPD polymer and polyphosphoric acid having 81.9 wt % P 2 O 5 was spun into fibers using a 250 hole spinneret.
  • a sample of wet, as-coagulated PIPD yarn was treated in boiling 80% phosphoric acid (142°C) for 15 seconds, washed in 91 0 C water for 10 seconds, then in 60°C baths of 2% aqueous caustic, water, 2% aqueous acetic acid, and water for 10 seconds each. The sample was then allowed to air dry. This sample was found to exhibit stuck or fused filaments and had a residual phosphorus level of 7.44%.
  • a solution of PIPD polymer and polyphosphoric acid having about 82.1 wt % P 2 O 5 was spun into fibers using a 250 hole spinneret. Samples of the wet as-coagulated yarn were then boiled in water for a variety of times as shown in Table 1. The samples were then further washed at 60° C in successive baths of water, 2 wt % aqueous caustic, water, 2% aqueous acetic acid, and then water for 20 seconds in each bath. After drying, the samples were found to contain the phosphorus content as shown in the table. Tai
  • a solution of PIPD polymer and polyphosphoric acid having 82.5 wt % P 2 O 5 was spun into fibers using a 250 hole spinneret.
  • Samples of wet, as-coagulated PIPD yarn were taken and first treated by high temperature, acidic hydrolysis conditions by employing boiling phosphoric acids of varying concentrations as shown in Table 2. Yarn samples were treated in hydrolyzing media for the times and temperatures shown. Washing of the samples was then done as shown in the Table 2.
  • the washing steps included a combination of the steps of a) washing in water; b) washing in 2% aqueous sodium hydroxide in water; c) washing in water, d) washing in 2% aqueous acetic acid in water; and washing in water.
  • the washings were performed for the indicated times and temperatures as shown in the table. It is possible to achieve residual phosphorus levels of under 2 weight % by such aggressive hydrolysis conditions when combined with washing.
  • a solution of PIPD polymer and polyphosphoric acid having 82.5 wt % P 2 O 5 was spun into fibers using a 250 hole spinneret.
  • a sample of wet, as-coagulated PIPD yarn was treated in atmospheric pressure steam (100°C) for 60 seconds followed by rinsing in 60°C water for 20 seconds. The sample was allowed to air dry and was found to contain 6.48 wt % P.
  • Another similarly treated sample that was not air-dried was further washed at 6O 0 C in successive baths of 2 wt % aqueous sodium hydroxide, and then water for 20 seconds. After drying this sample was found to contain 2.1wt % phosphorus.
  • a solution of PIPD polymer and polyphosphoric acid having 82.5 wt % P 2 O 5 was spun into fibers using a 250 hole spinneret.
  • a sample of wet, as-coagulated PIPD yarn so spun was treated in saturated steam at about 58 psig and 148° C for 60 seconds followed by 20 second washes in the following baths at 60° C: water, 2 wt % aqueous caustic, water, 2% aqueous acetic acid, and then water. After drying, the sample was found to contain 0.33 wt % phosphorus.
  • a solution of PIPD polymer and polyphosphoric acid having 82.1 wt % P 2 O 5 was spun into fibers using a 100 hole spinneret.
  • the wet, as-coagulated PIPD yarns were strung up to pass through a one-foot long nitrogen-purged tube oven.
  • Table 3 shows the influence of tube oven temperature and residence time on the resulting levels of phosphorus in the samples following washing and drying. All samples were washed for 20 seconds each in 60°C baths of water, followed by 2% aqueous sodium hydroxide, water, 2% acetic acid in water, and water.
  • Phosphorus levels under lw% are obtained under many conditions using dry heat hydrolysis of wet, as coagulated yarn followed by the indicated washings.
  • dpf is denier per filament
  • Example I [0tf70] and polyphosphoric acid having 82.7 wt % P 2 O 5 was spun into fibers using a 250 hole spinneret.
  • a wet, as coagulated PIPD yarn was treated continuously in an oven, however, the residence times and the temperatures were as shown in Table 4. This time the yarn samples were only treated for 20 seconds in each of the following baths at 45-50°C, water, 2% aqueous sodium hydroxide, and water. Residual phosphorus and sodium values are given in Table 3 and illustrate the benefits of the high temperature hydrolysis treatment on reducing the level of residual phosphorus.
  • PIPD filaments were spun from a polymer solution consisting of 18 weight percent of PIPD in polyphosphoric acid (82.1 wt % P 2 O 5 ). The solution was extruded from a spinneret having approximately 250 holes, drawn across an air gap and coagulated in water. The wet yarns were processed at 61 meters/min (200 ft/min) on the pair of heated rolls operating at measured surface temperatures of 201-221 0 C and wound up on bobbins. The yarns that had been processed on hot rolls were observed to be very stiff and have excessive fusing of individual filaments. In addition, undesirable fiber residue was observed on the hot rolls. Additional processing details and results are shown in Table 6.
  • the yarns on the bobbins were then washed and neutralized by immersing the bobbins for five minutes each in five consecutive baths that were at room temperature.
  • the baths were, in order, water; 2% sodium hydroxide in water; water; 2% acetic acid in water; and water.
  • the yarns on the bobbins were then allowed to air-dry and a sample of yarn was taken and the residual phosphorus content was found to be very variable, ranging from about 0.77 weight percent to about 3.42 weight percent phosphorus.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Artificial Filaments (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Abstract

La présente invention porte sur des procédés d'élimination du phosphore d'une fibre ou d'un fil.
PCT/US2006/011513 2005-03-28 2006-03-27 Porcede d'elimination du phosphore d'une fibre ou d'un fil WO2006105225A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP2008504320A JP4769290B2 (ja) 2005-03-28 2006-03-27 繊維またはヤーンから燐を除去する方法
US11/909,670 US7888457B2 (en) 2005-04-01 2006-03-27 Process for removing phosphorous from a fiber or yarn
DE602006019564T DE602006019564D1 (de) 2005-03-28 2006-03-27 Verfahren zur entfernung von phosphor von einer faser oder einem garn
EP06748888A EP1863956B1 (fr) 2005-03-28 2006-03-27 Procede d'elimination du phosphore d'une fibre ou d'un fil
KR1020077024744A KR101337734B1 (ko) 2005-03-28 2006-03-27 섬유 또는 실로부터의 인의 제거 방법
AT06748888T ATE495287T1 (de) 2005-03-28 2006-03-27 Verfahren zur entfernung von phosphor von einer faser oder einem garn
CN2006800098253A CN101218384B (zh) 2005-03-28 2006-03-27 从纤维或纱线中去除磷的方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US66574105P 2005-03-28 2005-03-28
US60/665,741 2005-03-28

Publications (1)

Publication Number Publication Date
WO2006105225A1 true WO2006105225A1 (fr) 2006-10-05

Family

ID=36698807

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/011513 WO2006105225A1 (fr) 2005-03-28 2006-03-27 Porcede d'elimination du phosphore d'une fibre ou d'un fil

Country Status (7)

Country Link
EP (1) EP1863956B1 (fr)
JP (1) JP4769290B2 (fr)
KR (1) KR101337734B1 (fr)
CN (1) CN101218384B (fr)
AT (1) ATE495287T1 (fr)
DE (1) DE602006019564D1 (fr)
WO (1) WO2006105225A1 (fr)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006135470A2 (fr) * 2005-03-28 2006-12-21 E.I. Du Pont De Nemours And Company Procede de production d'un fil de polyareneazole
US7671171B2 (en) 2005-03-28 2010-03-02 E. I. Du Pont De Nemours And Company Processes for preparing high inherent viscosity polyareneazoles using metal powders
US7683157B2 (en) 2005-03-28 2010-03-23 E.I. Du Pont De Nemours And Company Process for the production of polyarenazole polymer
US7683122B2 (en) 2005-03-28 2010-03-23 E. I. Du Pont De Nemours And Company Processes for increasing polymer inherent viscosity
US7754846B2 (en) 2005-03-28 2010-07-13 E. I. Du Pont De Nemours And Company Thermal processes for increasing polyareneazole inherent viscosities
US7851584B2 (en) 2005-03-28 2010-12-14 E. I. Du Pont De Nemours And Company Process for preparing monomer complexes
US7888457B2 (en) 2005-04-01 2011-02-15 E. I. Du Pont De Nemours And Company Process for removing phosphorous from a fiber or yarn
US7906613B2 (en) 2005-03-28 2011-03-15 Magellan Systems International, Llc Process for removing cations from polyareneazole fiber
US7906615B2 (en) 2005-03-28 2011-03-15 Magellan Systems International, Llc Process for hydrolyzing polyphosphoric acid in a spun yarn
US7968029B2 (en) 2005-03-28 2011-06-28 E. I. Du Pont De Nemours And Company Processes for hydrolysis of polyphoshoric acid in polyareneazole filaments
US7968030B2 (en) 2005-03-28 2011-06-28 E.I. Du Pont De Nemours And Company Hot surface hydrolysis of polyphosphoric acid in spun yarns
US7977453B2 (en) 2005-03-28 2011-07-12 E. I. Du Pont De Nemours And Company Processes for hydrolyzing polyphosphoric acid in shaped articles
US8202965B2 (en) 2005-03-28 2012-06-19 E.I. Du Pont De Nemours And Company Fusion free hydrolysis of polyphosphoric acid in spun multifilament yarns
US8263221B2 (en) 2005-03-28 2012-09-11 Magellan Systems International, Llc High inherent viscosity polymers and fibers therefrom
WO2013105937A1 (fr) * 2012-01-11 2013-07-18 E. I. Du Pont De Nemours And Company Procédé pour éliminer le soufre contenu dans une fibre au moyen d'un acide aqueux
WO2013105955A1 (fr) * 2012-01-11 2013-07-18 E. I. Du Pont De Nemours And Company Procédé pour préparer un fil à base d'un copolymère d'aramide au moyen d'un lavage acide comportant un halogénure
WO2013105945A1 (fr) * 2012-01-11 2013-07-18 E. I. Du Pont De Nemours And Company Procédé pour préparer un fil à base d'un copolymère d'aramide fil au moyen d'un lavage acide
WO2013166086A1 (fr) * 2012-05-03 2013-11-07 E. I. Du Pont De Nemours And Company Procédé d'obtention de matières d'aramide à faible teneur en résidus
CN104040044A (zh) * 2012-01-11 2014-09-10 纳幕尔杜邦公司 用于使用卤酸离子交换从纤维中除去硫的方法

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9315923B2 (en) * 2012-01-11 2016-04-19 E I Du Pont De Nemours And Company Process for preparing yarn derived from aramid copolymer fiber having low residual sulfur
BR112014017003A2 (pt) 2012-01-11 2018-05-22 Du Pont método para remover enxofre
WO2013105938A1 (fr) * 2012-01-11 2013-07-18 E. I. Du Pont De Nemours And Company Procédé pour éliminer le soufre contenu dans une fibre par échange d'ions monovalents de solution saline
EP2802690B1 (fr) * 2012-01-11 2015-12-09 E. I. du Pont de Nemours and Company Procédé d'élimination de soufre d'une fibre par échange ionique aux sels d'halogénure
WO2013105954A1 (fr) * 2012-01-11 2013-07-18 E. I. Du Pont De Nemours And Company Procédé pour préparer un fil à base d'un copolymère d'aramide renfermant une faible quantité de soufre résiduel
US11959196B2 (en) * 2015-07-06 2024-04-16 Pbi Performance Products, Inc. Phosphonated PBI fiber

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5393478A (en) * 1993-08-20 1995-02-28 The Dow Chemical Company Process for coagulation and washing of polybenzazole fibers
US5525638A (en) * 1994-09-30 1996-06-11 The Dow Chemical Company Process for the preparation of polybenzazole filaments and fibers
US5674969A (en) * 1993-04-28 1997-10-07 Akzo Nobel Nv Rigid rod polymer based on pyridobisimidazole
EP0834608A2 (fr) * 1996-10-01 1998-04-08 Toyo Boseki Kabushiki Kaisha Fibre de polybenzazole et son procédé de fabrication
US5772942A (en) * 1995-09-05 1998-06-30 Toyo Boseki Kabushiki Kaisha Processes for producing polybenzazole fibers
WO2004003080A1 (fr) * 2002-06-26 2004-01-08 Toyo Boseki Kabushiki Kaisha Composition, fibre et film de polybenzazole presentant une longue duree de vie
WO2006014718A1 (fr) * 2004-07-22 2006-02-09 E.I. Dupont De Nemours And Company Processus pour préparer des fibres de polybenzazole en retirant l'acide polyphosphorique

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MX9702304A (es) 1994-09-30 1997-06-28 Dow Chemical Co Procedimiento para la preparacion de filamentos y fibras de polibenzazol.
JP3661802B2 (ja) * 1995-09-13 2005-06-22 東洋紡績株式会社 ポリベンザゾール繊維の製造方法
JP3651621B2 (ja) * 1995-09-05 2005-05-25 東洋紡績株式会社 ポリベンザゾール繊維の製造方法
WO2006105226A1 (fr) * 2005-03-28 2006-10-05 E. I. Du Pont De Nemours And Company Procede d'hydrolyse d'acide polyphosphorique dans un file

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5674969A (en) * 1993-04-28 1997-10-07 Akzo Nobel Nv Rigid rod polymer based on pyridobisimidazole
US5393478A (en) * 1993-08-20 1995-02-28 The Dow Chemical Company Process for coagulation and washing of polybenzazole fibers
US5525638A (en) * 1994-09-30 1996-06-11 The Dow Chemical Company Process for the preparation of polybenzazole filaments and fibers
US5772942A (en) * 1995-09-05 1998-06-30 Toyo Boseki Kabushiki Kaisha Processes for producing polybenzazole fibers
EP0834608A2 (fr) * 1996-10-01 1998-04-08 Toyo Boseki Kabushiki Kaisha Fibre de polybenzazole et son procédé de fabrication
WO2004003080A1 (fr) * 2002-06-26 2004-01-08 Toyo Boseki Kabushiki Kaisha Composition, fibre et film de polybenzazole presentant une longue duree de vie
EP1553143A1 (fr) * 2002-06-26 2005-07-13 Toyo Boseki Kabushiki Kaisha Composition, fibre et film de polybenzazole presentant une longue duree de vie
WO2006014718A1 (fr) * 2004-07-22 2006-02-09 E.I. Dupont De Nemours And Company Processus pour préparer des fibres de polybenzazole en retirant l'acide polyphosphorique

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7968030B2 (en) 2005-03-28 2011-06-28 E.I. Du Pont De Nemours And Company Hot surface hydrolysis of polyphosphoric acid in spun yarns
US7683122B2 (en) 2005-03-28 2010-03-23 E. I. Du Pont De Nemours And Company Processes for increasing polymer inherent viscosity
WO2006135470A2 (fr) * 2005-03-28 2006-12-21 E.I. Du Pont De Nemours And Company Procede de production d'un fil de polyareneazole
US7683157B2 (en) 2005-03-28 2010-03-23 E.I. Du Pont De Nemours And Company Process for the production of polyarenazole polymer
US7977453B2 (en) 2005-03-28 2011-07-12 E. I. Du Pont De Nemours And Company Processes for hydrolyzing polyphosphoric acid in shaped articles
US7754846B2 (en) 2005-03-28 2010-07-13 E. I. Du Pont De Nemours And Company Thermal processes for increasing polyareneazole inherent viscosities
US7776246B2 (en) 2005-03-28 2010-08-17 E. I. Du Pont De Nemours And Company Process for the production of polyarenazole yarn
US8202965B2 (en) 2005-03-28 2012-06-19 E.I. Du Pont De Nemours And Company Fusion free hydrolysis of polyphosphoric acid in spun multifilament yarns
US8263221B2 (en) 2005-03-28 2012-09-11 Magellan Systems International, Llc High inherent viscosity polymers and fibers therefrom
US7906613B2 (en) 2005-03-28 2011-03-15 Magellan Systems International, Llc Process for removing cations from polyareneazole fiber
US7906615B2 (en) 2005-03-28 2011-03-15 Magellan Systems International, Llc Process for hydrolyzing polyphosphoric acid in a spun yarn
US7968029B2 (en) 2005-03-28 2011-06-28 E. I. Du Pont De Nemours And Company Processes for hydrolysis of polyphoshoric acid in polyareneazole filaments
US7671171B2 (en) 2005-03-28 2010-03-02 E. I. Du Pont De Nemours And Company Processes for preparing high inherent viscosity polyareneazoles using metal powders
WO2006135470A3 (fr) * 2005-03-28 2007-03-29 Du Pont Procede de production d'un fil de polyareneazole
US7851584B2 (en) 2005-03-28 2010-12-14 E. I. Du Pont De Nemours And Company Process for preparing monomer complexes
US7888457B2 (en) 2005-04-01 2011-02-15 E. I. Du Pont De Nemours And Company Process for removing phosphorous from a fiber or yarn
WO2013105937A1 (fr) * 2012-01-11 2013-07-18 E. I. Du Pont De Nemours And Company Procédé pour éliminer le soufre contenu dans une fibre au moyen d'un acide aqueux
WO2013105955A1 (fr) * 2012-01-11 2013-07-18 E. I. Du Pont De Nemours And Company Procédé pour préparer un fil à base d'un copolymère d'aramide au moyen d'un lavage acide comportant un halogénure
WO2013105945A1 (fr) * 2012-01-11 2013-07-18 E. I. Du Pont De Nemours And Company Procédé pour préparer un fil à base d'un copolymère d'aramide fil au moyen d'un lavage acide
CN104040042A (zh) * 2012-01-11 2014-09-10 纳幕尔杜邦公司 使用含水酸从纤维中除去硫的方法
CN104040044A (zh) * 2012-01-11 2014-09-10 纳幕尔杜邦公司 用于使用卤酸离子交换从纤维中除去硫的方法
CN104040043A (zh) * 2012-01-11 2014-09-10 纳幕尔杜邦公司 使用酸洗液制备芳族聚酰胺共聚物纱线的方法
CN104040046A (zh) * 2012-01-11 2014-09-10 纳幕尔杜邦公司 使用含卤酸洗液制备芳族聚酰胺共聚物纱的方法
WO2013166086A1 (fr) * 2012-05-03 2013-11-07 E. I. Du Pont De Nemours And Company Procédé d'obtention de matières d'aramide à faible teneur en résidus
US9580863B2 (en) 2012-05-03 2017-02-28 E I Du Pont De Nemours And Company Process for obtaining low residual aramid materials

Also Published As

Publication number Publication date
ATE495287T1 (de) 2011-01-15
KR101337734B1 (ko) 2013-12-06
CN101218384A (zh) 2008-07-09
EP1863956A1 (fr) 2007-12-12
DE602006019564D1 (de) 2011-02-24
JP2008534804A (ja) 2008-08-28
EP1863956B1 (fr) 2011-01-12
CN101218384B (zh) 2010-12-08
KR20080034829A (ko) 2008-04-22
JP4769290B2 (ja) 2011-09-07

Similar Documents

Publication Publication Date Title
EP1863956B1 (fr) Procede d'elimination du phosphore d'une fibre ou d'un fil
US7906615B2 (en) Process for hydrolyzing polyphosphoric acid in a spun yarn
EP1863954B1 (fr) Processus d'hydrolyse d'acide polyphosphorique dans des filaments de polyareneazole
EP1877602B1 (fr) Procede d hydrolyse d acide polyphosphorique dans des articles mis en forme
EP1869233B1 (fr) Procede d' elimination des cations dans une fibre polyareneazole
EP1863955B1 (fr) Fibres de polymere de polyareneazole possedant des groupes hydroxyle libres et des cations
US7968030B2 (en) Hot surface hydrolysis of polyphosphoric acid in spun yarns
US7888457B2 (en) Process for removing phosphorous from a fiber or yarn
US8202965B2 (en) Fusion free hydrolysis of polyphosphoric acid in spun multifilament yarns

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200680009825.3

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application
DPE1 Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101)
WWE Wipo information: entry into national phase

Ref document number: 7113/DELNP/2007

Country of ref document: IN

WWE Wipo information: entry into national phase

Ref document number: 11909670

Country of ref document: US

ENP Entry into the national phase

Ref document number: 2008504320

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2006748888

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 1020077024744

Country of ref document: KR

NENP Non-entry into the national phase

Ref country code: RU