EP0686712B1 - Flexible Cellulosefasern mit reduziertem Modul und vermindertem NMR-Ordnungsgrad und deren Herstellungsverfahren - Google Patents
Flexible Cellulosefasern mit reduziertem Modul und vermindertem NMR-Ordnungsgrad und deren Herstellungsverfahren Download PDFInfo
- Publication number
- EP0686712B1 EP0686712B1 EP95104358A EP95104358A EP0686712B1 EP 0686712 B1 EP0686712 B1 EP 0686712B1 EP 95104358 A EP95104358 A EP 95104358A EP 95104358 A EP95104358 A EP 95104358A EP 0686712 B1 EP0686712 B1 EP 0686712B1
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- EP
- European Patent Office
- Prior art keywords
- spinning
- mass
- cellulose
- tex
- additives
- 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.)
- Expired - Lifetime
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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
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
Definitions
- the invention relates to flexible cellulose fibers with a reduced modulus and a reduced degree of NMR order for predominant use in such textile areas where flexible moldings, e.g. textile fibers and filament yarn are produced and required, hereinafter called fibers, and those that are more environmentally friendly than the viscose process N-methylmorpholine-N-oxide (NMMNO) spinning process can be produced, and a Process for their production.
- flexible moldings e.g. textile fibers and filament yarn are produced and required
- NMMNO N-methylmorpholine-N-oxide
- NMMNO and caprolactam derivatives also has good solubility properties for cellulose (US Pat. No. 5,362,867, TW 210359).
- a special feature of this process is the instability of the solvent under certain conditions at temperatures just above the processing temperature of the spinning solutions, which can lead to an uncontrolled chain reaction.
- additives are added to the spinning solution with the aim of stabilizing the spinning solution, in particular preventing or at least limiting the breakdown of the cellulose and the decomposition of the NMMNO (DD 201 703, DD 229 708, DD158 656) .
- a number of substances such as amines, gallates, ascorbic acid, hydroquinone and urea are mentioned by various authors. Propyl gallate has proven to be particularly effective even at low concentrations.
- the amounts used for stabilization are in a range below 1% based on cellulose.
- Additives are also used to prevent the threads from sticking during the process Spinning process recommended (DD 218 121) e.g. Polyethylene glycol, or as useful for that Increased tear strength and the modulus of the threads detected (Chanzy, H. et al .: polymer 31: 400-405 (1990).
- the fibers produced by the NMMNO process are compared to viscose fibers characteristic of high strengths and moduli.
- the tensile strengths are in general in an approximate range of approx. 20 to 50 cN / tex, where cN / tex centi Newtons per tex means, and the initial moduli in a range above about 1500 cN / tex. It means that the strengths are pleasantly high, but often higher than necessary and the moduli significantly high for an advantageous application in the area of flexible fibers with good textile usage properties in which e.g. the usual, for textile use in clothing proven viscose fibers with initial moduli well below 1500 cN / tex will.
- the fibers produced with it also have some other disadvantages compared to those which are produced using the conventional viscose process. Among other things, they show brittleness and fibrillation resistance. The values achieved for the elongation at break cannot be satisfactory either, so that Krisoninin et al. (SU 1 224 362) and Romanov et al. (Fiber Chemistry, 21, 4 (1990), 317-320) correct this defect in place of the most commonly used Falling bath from an aqueous NMMNO solution, a solution of NMMNO in isopropanol or amyl alcohol has been described. It also proves to be disadvantageous that the range of variation of the textile-physical characteristic values is small when the production conditions change.
- the fibers have a relatively high degree of order, which can be seen in the high-resolution 13 C-NMR solid-state spectrum at C-1, C-4 and to a certain extent also at C-6. From the ratio of the line heights (distance of the maximum of the respective line from the baseline of the spectrum) at C-4 at approx. 88 and 85 ppm, a relatively easily accessible measure, it can be seen, for example, that this ratio has a value ⁇ 1 for flexible viscose fibers , 0, while for NMMNO fibers it is above one, for example 1.35.
- the object of the present invention is to provide such flexible cellulose fibers, all Do not have disadvantages of the prior art to specify.
- Another procedural object of the invention is that it is proposed Process for producing the flexible cellulose fibers of the type mentioned lower Investment costs required and less polluting than the viscose process.
- An additional object of the invention is that this to be proposed on the Process based on the NMMNO process with regard to the range of variation textile-physical parameters about changes in manufacturing conditions allows great scope.
- the tasks on the cellulose fiber side are solved with a flexible cellulose fiber with a reduced module and a reduced degree of NMR order, especially for textile use, which is achieved by pressing solutions of cellulose in water-containing NMMNO (N-methylmorpholine-N-oxide) through spinnerets over an air gap in an NMMNO-containing aqueous and / or alcoholic precipitation bath, as well as by conventional rinsing, post-treatment and drying with strengths between 15 and 50 cN / tex.
- NMMNO N-methylmorpholine-N-oxide
- these flexible cellulose fibers which can be produced in this way are characterized in that they have an initial modulus of less than 1500 cN / tex and in the high-resolution 13 C-NMR solid-state spectrum the ratio of the heights of the lines at 88 ppm and 85 ppm (C-4 range ) above the spectrum baseline is ⁇ 1.
- the initial module and the NMR order of the cellulose fibers precipitated from cellulose NMMNO water spinning solutions then drastically lower when both the cellulose spinning solution hydrophilic, low molecular weight, organic, soluble in the polymer solution
- Additives can be added.
- Amines and amides are suitable as additives for this or other substances containing amino groups, which is one of the nitrogen groups have a neighboring oxygen-containing group.
- the concentration of additives in the spinning solution, based on the cellulose content of the solution should be at least 1% by mass, amount to a maximum of 200% by mass.
- a proportion of the additives in the precipitation bath is at least 0.1 mass% and at most 20 mass%, based on the amount of Total fall bath, cheap.
- Additives are preferably used in which the oxygen-containing group is a Is carbonyl group.
- the oxygen-containing group is a Is carbonyl group.
- Urea e.g. Urea, caprolactam, Aminopropanol and / or aminocarboxylic acid used.
- Several additives can be used as individual components or as Introduce mixture.
- the concentration of the additives in the spinning solution should be at least 10% by mass and at most 100% by mass. So it is advantageous here, for example, if the concentration of the additives in the spinning solution, based on the cellulose content of the solution at least 4% by mass, at most 75% by mass, preferably at least 10% by mass, at most 50% by mass. Against it in the precipitation bath a proportion of the additives of at least 1% by mass and at most 10% by mass, based on the amount of total precipitation bath preferred.
- the desired effect also occurs when the water in the precipitation bath partially or completely, preferably completely, by alcohols, in particular is replaced by isopropanol or amyl alcohol, the additives up to their maximum Saturation concentration can be contained in the precipitation bath.
- the fibers spun in a conventional manner from a nozzle through an air gap into the precipitation bath and aftertreated and dried in the usual way have an initial modulus derived in a known manner from the force / elongation diagram of well below 1500 cN / tex, preferably even below 1200 cN / tex, and / or an NMR order of magnitude of ⁇ 1 characterized by the height ratio in the maximum of the lines at 88 ppm and 85 ppm above the baseline of the high-resolution 13 C-NMR solid-state spectrum in the C-4 range.
- a spinning solution of 9.5% cellulose in NMMNO monohydrate with 0.1% by mass, based on cellulose, propyl gallate as stabilizing agent was spun in a laboratory extruder with a 20-hole nozzle at a temperature of 90 ° C., being the spinning bath (Precipitation bath) a 10% solution of NMMNO in water was used.
- the fiber has the following parameters: Titer: 4.1 tex Tensile strength, dry: 34.3 cN / tex wet: 23.2 cN / tex Elongation at break, dry: 5.1% wet: 8.1% Initial module, dry: 2117 cN / tex wet: 311 cN / tex
- the ratio of the heights of the NMR lines at 88 and 85 ppm is 1.35.
- the fiber has the following parameters: Titer: 4.1 tex Tensile strength, dry: 35.6 cN / tex wet: 10.5 cN / tex Elongation at break, dry: 10.0% wet: 18.1% Initial module, dry: 1922 cN / tex wet: 131 cN / tex
- the ratio of the heights of the NMR lines at 88 and 85 ppm is 1.0.
- Example 2 using a precipitation bath consisting of a 6% aqueous urea solution.
- the fiber has the following parameters: Titer: 4.1 tex Tensile strength, dry: 33.1 cN / tex wet: 12.2 cN / tex Elongation at break, dry: 11.5% wet: 17.0% Initial module, dry: 1430 cN / tex wet: 120 cN / tex
- the ratio of the heights of the NMR lines at 88 and 85 ppm is 1.0.
- the fiber has the following parameters: Titer: 4.0 tex Tensile strength, dry: 28.0 cN / tex wet: 13.2 cN / tex Elongation at break, dry: 13.9% wet: 19.9% Initial module, dry: 446 cN / tex wet: 126 cN / tex
- the ratio of the heights of the NMR lines at 88 and 85 ppm is 0.96.
- the ratio of the heights of the NMR lines at 88 and 85 ppm is 0.98.
- caprolactam As example 1 with an addition of 25% caprolactam, based on the cellulose content, but additionally in the spinning solution using a spinning bath (precipitation bath) consisting of a 10% aqueous caprolactam solution.
- the fiber has the following parameters: Titer: 4.0 tex Tensile strength, dry: 31.0 cN / tex wet: 10.9 cN / tex Elongation at break, dry: 12.3% wet: 18.4% Initial module, dry: 1255 cN / tex wet: 110 cN / tex
- the ratio of the heights of the NMR lines at 88 and 85 ppm is 0.95.
- the fiber has the following parameters: Titer: 4.2 tex Tensile strength, dry: 25.4 cN / tex wet: 10.1 cN / tex Elongation at break, dry: 7.1% wet: 11.9% Initial module, dry: 1580 cN / tex wet: 278 cN / tex
- the ratio of the heights of the NMR lines at 88 and 85 ppm is 0.98.
- the fiber has the following parameters: Titer: 3.9 tex Tensile strength, dry: 18.3 cN / tex wet: 5.7 cN / tex Elongation at break, dry: 6.1% wet: 23.4% Initial module, dry: 760 cN / tex wet: 63 cN / tex
- the ratio of the heights of the NMR lines at 88 and 85 ppm is 0.96.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Artificial Filaments (AREA)
- Multicomponent Fibers (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Description
Eine Besonderheit dieses Prozesses ist die unter bestimmten Bedingungen bestehende Instabilität des Lösungsmittels bei nur wenig oberhalb der Verarbeitungstemperatur der Spinnlösungen liegenden Temperaturen, die bis zur unkontrollierten Kettenreaktion gehen kann. Zum Stand der Technik gehört es deshalb, daß der Spinnlösung Additive hinzugefügt werden mit dem Ziel der Stabilisierung der Spinnlösung, insbesondere der Verhinderung oder zumindest der Begrenzung des Abbaus der Cellulose und der Zersetzung des NMMNO (DD 201 703, DD 229 708, DD158 656). Zu diesem Zwecke wird von verschiedenen Autoren eine ganze Reihe von Substanzen wie z.B. Amine, Gallate, Ascorbinsäure, Hydrochinon und Harnstoff genannt. Als besonders wirkungsvoll schon bei geringen Konzentrationen hat sich Propylgallat erwiesen. Die Einsatzmengen zur Stabilisierung bewegen sich in einem Bereich unter 1 % bezogen auf Cellulose.
Titer: | 4,1 tex | |
Reißfestigkeit, | trocken: | 34,3 cN/tex |
naß: | 23,2 cN/tex | |
Reißdehnung, | trocken: | 5,1 % |
naß: | 8,1 % | |
Anfangsmodul, | trocken: | 2117 cN/tex |
naß: | 311 cN/tex |
Titer: | 4,1 tex | |
Reißfestigkeit, | trocken: | 35,6 cN/tex |
naß: | 10,5 cN/tex | |
Reißdehnung, | trocken: | 10,0 % |
naß: | 18,1 % | |
Anfangsmodul, | trocken: | 1922 cN/tex |
naß: | 131 cN/tex |
Titer: | 4,1 tex | |
Reißfestigkeit, | trocken: | 33,1 cN/tex |
naß: | 12,2 cN/tex | |
Reißdehnung, | trocken: | 11,5 % |
naß: | 17,0 % | |
Anfangsmodul, | trocken: | 1430 cN/tex |
naß: | 120 cN/tex |
Titer: | 4,0 tex | |
Reißfestigkeit, | trocken: | 28,0 cN/tex |
naß: | 13,2 cN/tex | |
Reißdehnung, | trocken: | 13,9 % |
naß: | 19,9 % | |
Anfangsmodul, | trocken: | 446 cN/tex |
naß: | 126 cN/tex |
Titer: | 4,0 tex | |
Reißfestigkeit, | trocken: | 31,0 cN/tex |
naß: | 10,9 cN/tex | |
Reißdehnung, | trocken: | 12,3 % |
naß: | 18,4 % | |
Anfangsmodul, | trocken: | 1255 cN/tex |
naß: | 110 cN/tex |
Titer: | 4,0 tex | |
Reißfestigkeit, | trocken: | 31,0 cN/tex |
naß: | 10,9 cN/tex | |
Reißdehnung, | trocken: | 12,3 % |
naß: | 18,4 % | |
Anfangsmodul, | trocken: | 1255 cN/tex |
naß: | 110 cN/tex |
Titer: | 4,2 tex | |
Reißfestigkeit, | trocken: | 25,4 cN/tex |
naß: | 10,1 cN/tex | |
Reißdehnung, | trocken: | 7,1 % |
naß: | 11,9 % | |
Anfangsmodul, | trocken: | 1580 cN/tex |
naß: | 278 cN/tex |
Titer: | 3,9 tex | |
Reißfestigkeit, | trocken: | 18,3 cN/tex |
naß: | 5,7 cN/tex | |
Reißdehnung, | trocken: | 6,1 % |
naß: | 23,4 % | |
Anfangsmodul, | trocken: | 760 cN/tex |
naß: | 63 cN/tex |
Claims (13)
- Flexible Cellulosefasern mit reduziertem Modul und vermindertem NMR-Ordnungsgrad, insbesondere für den textilen Einsatz, die durch Auspressen von Lösungen der Cellulose in wasserhaltigem N-Methyl-Morpholin-N-Oxid (NMMNO) durch Spinndüsen über eine Luftstrecke in ein NMMNO-haltiges wässriges und/oder alkoholisches Fällbad, sowie durch herkömmliches Spülen, Nachbehandeln und Trocknen mit Reißfestigkeiten zwischen 15 und 50 cN/tex erhalten werden, dadurch gekennzeichnet , daß sie im trockenen Zustand einen Anfangsmodul von kleiner als 1500 cN/tex besitzen und daß im hochaufgelösten 13C-NMR-Festkörperspektrum das Verhältnis der Höhen der Linien bei 88 ppm und 85 ppm (C-4-Bereich) über der Spektrumsgrundlinie ≤ 1 ist.
- Verfahren zur Herstellung von flexiblen Cellulosefasern mit reduziertem Modul und vermindertem NMR-Ordnungsgrad gemäß Anspruch 1 durch Auspressen einer Lösung von Cellulose in wasserhaltigem NMMNO durch eine Spinndüse über eine Luftstrecke in ein NMMNO-haltiges wässriges und/oder alkoholisches Fällbad und anschließendes Waschen, Nachbehandeln und Trocknen auf herkömmliche Weise dadurch gekennzeichnet , daß sowohl der Spinnlösung der Cellulose als auch dem Fällbad hydrophile, in der Polymerlösung lösliche, niedermolekulare, organische Additive hinzugefügt werden, daß die Additive Amine, Amide oder andere Amino- Gruppen enthaltende Substanzen, bei denen die stickstoffenthaltende Gruppierung einer sauerstoffenthaltenden Gruppe benachbart ist, darstellen, daß die Konzentration der Additive in der Spinnlösung, bezogen auf den Celluloseanteil der Spinnlösung, mindestens 1 Masse-% und höchstens 200 Masse-% entspricht und daß der Masseanteil der Additive am Fällbad mindestens 0,1 Masse-% und höchstens 20 Masse-% beträgt.
- Verfahren nach Anspruch 2, dadurch gekennzeichnet , daß die sauerstofftragenden Gruppen Carbonylgruppen sind.
- Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet , daß als Additive Hamstoff, Caprolactam und/oder Aminocapronsäure eingesetzt werden.
- Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet ,daß als Additiv Aminopropanol eingesetzt wird.
- Verfahren nach einem oder mehreren der Ansprüche 2 bis 5, dadurch gekennzeichnet , daß die Additive als Gemische miteinander eingesetzt werden, wenn mehrere Additive zum Einsatz kommen.
- Verfahren nach einem oder mehreren der Ansprüche 2 bis 5, dadurch gekennzeichnet , daß die Additive als Einzelkomponenten eingesetzt werden, auch wenn mehrere Additive zum Einsatz kommen.
- Verfahren nach einem oder mehreren der Ansprüche 2 bis 7, dadurch gekennzeichnet , daß das bzw. die dem Fällbad zugesetzte(n) Additiv(e) dem bzw. den in der Spinnlösung enthaltenen Additiv(en) entsprechen.
- Verfahren nach Anspruch 2, dadurch gekennzeichnet , daß die Mengen, in denen die Additive zur Spinnlösung hinzugefügt werden, einer Konzentration der Additive in der Spinnlösung, bezogen auf den Celluloseanteil der Spinnlösung, von mindestens 10 Masse-% und höchstens 100 Masse-% entsprechen.
- Verfahren nach Anspruch 2, dadurch gekennzeichnet , daß der Masseanteil der Additive am Fällbad mindestens 1 Masse-% und höchstens 10 Masse-% beträgt.
- Verfahren nach einem oder mehreren der Ansprüche 2 bis 10, dadurch gekennzeichnet , daß das Wasser im Fällbad teilweise oder vollständig durch Alkohole ersetzt ist.
- Verfahren nach Anspruch 11, dadurch gekennzeichnet , daß das Wasser im Fällbad vollständig durch Alkohole ersetzt ist.
- Verfahren nach Anspruch 11 oder 12, dadurch gekennzeichnet , daß als Alkohole Isopropanol und/oder Amylalkohol eingesetzt werden.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4420304A DE4420304C1 (de) | 1994-06-10 | 1994-06-10 | Flexible Cellulosefasern mit reduziertem Modul und vermindertem NMR-Ordnungsgrad und deren Herstellung |
DE4420304 | 1994-06-10 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0686712A2 EP0686712A2 (de) | 1995-12-13 |
EP0686712A3 EP0686712A3 (de) | 1996-05-01 |
EP0686712B1 true EP0686712B1 (de) | 1998-09-09 |
Family
ID=6520270
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95104358A Expired - Lifetime EP0686712B1 (de) | 1994-06-10 | 1995-03-24 | Flexible Cellulosefasern mit reduziertem Modul und vermindertem NMR-Ordnungsgrad und deren Herstellungsverfahren |
Country Status (4)
Country | Link |
---|---|
US (1) | US5618483A (de) |
EP (1) | EP0686712B1 (de) |
AT (1) | ATE170938T1 (de) |
DE (2) | DE4420304C1 (de) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19600572B4 (de) * | 1996-01-09 | 2005-03-10 | Fraunhofer Ges Forschung | Verfahren zur Herstellung von Cellulosefasern und die mit diesem Verfahren hergestellten Fasern |
US6210801B1 (en) | 1996-08-23 | 2001-04-03 | Weyerhaeuser Company | Lyocell fibers, and compositions for making same |
US6235392B1 (en) | 1996-08-23 | 2001-05-22 | Weyerhaeuser Company | Lyocell fibers and process for their preparation |
US6306334B1 (en) | 1996-08-23 | 2001-10-23 | The Weyerhaeuser Company | Process for melt blowing continuous lyocell fibers |
US6331354B1 (en) | 1996-08-23 | 2001-12-18 | Weyerhaeuser Company | Alkaline pulp having low average degree of polymerization values and method of producing the same |
US6471727B2 (en) | 1996-08-23 | 2002-10-29 | Weyerhaeuser Company | Lyocell fibers, and compositions for making the same |
DE19737113A1 (de) * | 1997-08-27 | 1999-03-04 | Kalle Nalo Gmbh | Verfahren und Vorrichtung zur Herstellung eines nahtlosen Folienschlauches auf Cellulosebasis durch Extrudieren |
DE19753190B4 (de) * | 1997-11-21 | 2004-02-26 | Gerking, Lüder, Dr.-Ing. | LYOCELL-Fasern mit verringerter Neigung zum Fibrillieren |
US6143884A (en) * | 1998-05-09 | 2000-11-07 | Acelon Chemicals & Fiber Corporation | Manufacturing process of cellulose viscose with low viscosity |
GB9810778D0 (en) * | 1998-05-19 | 1998-07-15 | Courtaulds Plc | Cellulosic solutions and their uses |
US6773648B2 (en) | 1998-11-03 | 2004-08-10 | Weyerhaeuser Company | Meltblown process with mechanical attenuation |
DE10016307C2 (de) * | 2000-03-31 | 2002-05-08 | Thueringisches Inst Textil | Verfahren zur Herstellung und Verarbeitung einer Celluloselösung |
DE10019628A1 (de) * | 2000-04-19 | 2001-10-31 | Fraunhofer Ges Forschung | Verfahren zur Verringerung des Ordnungsgrades von Cellulose |
US6749721B2 (en) | 2000-12-22 | 2004-06-15 | Kimberly-Clark Worldwide, Inc. | Process for incorporating poorly substantive paper modifying agents into a paper sheet via wet end addition |
US6916402B2 (en) * | 2002-12-23 | 2005-07-12 | Kimberly-Clark Worldwide, Inc. | Process for bonding chemical additives on to substrates containing cellulosic materials and products thereof |
AT413287B (de) * | 2003-11-25 | 2006-01-15 | Chemiefaser Lenzing Ag | Verfahren zur herstellung cellulosischer fasern |
US7670459B2 (en) * | 2004-12-29 | 2010-03-02 | Kimberly-Clark Worldwide, Inc. | Soft and durable tissue products containing a softening agent |
TWI667378B (zh) | 2014-01-03 | 2019-08-01 | 奧地利商蘭精股份有限公司 | 纖維素纖維 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE218121C (de) * | ||||
DE142898C (de) * | ||||
DE201703C (de) * | ||||
DE229708C (de) * | ||||
US3767756A (en) * | 1972-06-30 | 1973-10-23 | Du Pont | Dry jet wet spinning process |
US4144080A (en) * | 1977-07-26 | 1979-03-13 | Akzona Incorporated | Process for making amine oxide solution of cellulose |
US4142913A (en) * | 1977-07-26 | 1979-03-06 | Akzona Incorporated | Process for making a precursor of a solution of cellulose |
DD158656A1 (de) * | 1981-04-27 | 1983-01-26 | Birgitte Lukanoff | Verfahren zur verringerung des celluloseabbaus in aminoxidhaltigen celluloseloesungen |
SU1224362A1 (ru) * | 1984-06-29 | 1986-04-15 | Предприятие П/Я А-3844 | Способ получени целлюлозных волокон |
TW210359B (en) * | 1992-01-22 | 1993-08-01 | Formosa Chemicals Fibre Corp | A spinning method by using spinning solution prepared from pulp cellulose which is dissolved by N-methyl morpholine N-oxide and recycled caprolactam as solvents |
US5362867A (en) * | 1992-05-27 | 1994-11-08 | Formosa Chemicals & Fibre Corporation | Method of making cellulose yarn solution |
-
1994
- 1994-06-10 DE DE4420304A patent/DE4420304C1/de not_active Expired - Fee Related
-
1995
- 1995-03-24 DE DE59503497T patent/DE59503497D1/de not_active Expired - Lifetime
- 1995-03-24 EP EP95104358A patent/EP0686712B1/de not_active Expired - Lifetime
- 1995-03-24 AT AT95104358T patent/ATE170938T1/de not_active IP Right Cessation
- 1995-06-06 US US08/469,426 patent/US5618483A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE59503497D1 (de) | 1998-10-15 |
ATE170938T1 (de) | 1998-09-15 |
US5618483A (en) | 1997-04-08 |
EP0686712A2 (de) | 1995-12-13 |
DE4420304C1 (de) | 1995-09-21 |
EP0686712A3 (de) | 1996-05-01 |
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