CA2057133A1 - Method of producing shaped cellulosic articles - Google Patents
Method of producing shaped cellulosic articlesInfo
- Publication number
- CA2057133A1 CA2057133A1 CA002057133A CA2057133A CA2057133A1 CA 2057133 A1 CA2057133 A1 CA 2057133A1 CA 002057133 A CA002057133 A CA 002057133A CA 2057133 A CA2057133 A CA 2057133A CA 2057133 A1 CA2057133 A1 CA 2057133A1
- Authority
- CA
- Canada
- Prior art keywords
- bath
- cellulose
- solution
- precipitating
- nmmo
- 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.)
- Abandoned
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
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B1/00—Preparatory treatment of cellulose for making derivatives thereof, e.g. pre-treatment, pre-soaking, activation
- C08B1/003—Preparation of cellulose solutions, i.e. dopes, with different possible solvents, e.g. ionic liquids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/02—Cellulose; Modified cellulose
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Biochemistry (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Artificial Filaments (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Paper (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Shaped cellulosic bodies and especially cellulosic fibers or filaments are produced by precipitating cellulose from a solution containing cellulose and NMMO. To allow elevated concentrations of NMMO in the precipitating bath without detriment to the properties of the fibers or filaments produced, the temperature of the precipitating bath is held at most at 0°C.
Shaped cellulosic bodies and especially cellulosic fibers or filaments are produced by precipitating cellulose from a solution containing cellulose and NMMO. To allow elevated concentrations of NMMO in the precipitating bath without detriment to the properties of the fibers or filaments produced, the temperature of the precipitating bath is held at most at 0°C.
Description
NETHOD OF PRO WCING SHAP~D OE LLUIOSIC ARTICLES
SP~CIFI QTION
Field of the Invention Our present invention relates to a process for producing shaped cellulose bodies from a solution of cellulose in N-methylmorpholine-N-oxide (NMMO) and water wherein the solution is shaped and the cellulose precipitated in a precipitating bath containing water and MMMO.
ackground of the Invention U.S. Patent 4,196,282 describes a process in which a eolution of cellulose in N-methylmorpholine-N-oxide (hereina~ter NMMO) and water is formed. Cellulose solutione of thie type can be used to produce cellulose fibers or other ehaped bodies of a cellulose base. For this purpose, the cellulose is extruded by spinning nozzles, e.g. a spinneret, into a precipitating or coagulating bath. The use of a mixture o~ NMMO and water as eolvent has a number of advantages. For example, it allows operation with a closed solvent cycle since NMMO can be recovered and reueed both in dissolving the cellulose for preparing the epinning solution and in the coagulating bath.
*.~ ;~r In the NMMO process, the cellulose dissolved in NMMO
and water is coagulated in an NMMO containing coagulating bath, the fibers are then washed and the washing water recycled to the precipitating bath. In regenerating of the precipitating bath it is evaporated to allow recovery of the NMMO concentrate which can be used to form fresh solutions of the cellulose while the distillate can be employed for washing the fibers.
In prior art systems of this type, the NMMO
concentration in the precipitatinq bath has been limited to about 20 to 25% since higher concentrations appear red to have a detrimental effect on the characteristics of the fibers. It is, of course, desirable to raise the concentration of the NMMO in the precipitating or coagulating bath 80 that smaller quantities of water need to be evaporated to regenerate this bath.
Ob~ects of the Invention It is, therefore, the principal object of the present invention to provide an improved process for the production of shaped articles by the coagulation or precipitation of cellulose from an NMMO and water solution thereof, using an NMMO-containing precipitating or coagulating bath which will yield shaped bodies and especially fibers with good characteristics and yet can have an elevated NMMO
concentration in the precipitating bath.
Another ob;ect of this invention is to provide an improved me~hod of making shaped cellulosic articles whereby the aforementioned drawbacks are avoided.
~
Summary of the Invention These objects are attained, in accordance with the invention, in a process in which a solution of cellulose in NMNO and water is shaped and the shaped solution caused to pass into a precipitating and coagulating bath containing NMMO and water and in which the NMMo concentration is increased beyond that which has been considered to be possible heretofore without detriment to the quality of the shaped articles or fibers produced, by maintaining the temperature of the precipitating bath at 0C at the most.
We have found, quite surprisingly, that when the temperature is held at O~C at the most in the precipitating bath, the NMM0 concentration thereof can be maintained above 40% without detriment to the fiber characteristics of the fibers produced.
De8c~iption o~ the Drawing The above and other objects, features and advantages of the present invention will become more readily apparent from the following description, reference being made to the accompanying drawing, the sole FIGURE of which is a flow diagram illustrating an apparatus for carrying out the method of the invention.
Specific Descri~tion In the drawing, we have shown a spinneret 10 suppl ied with a spinning solution consisting of cellulose dissolved in NMMO and water via a line 11 and from which a plurality of solution streams 12 of which only one has been illustrated, can pass downwardly through an air gap 13 into the precipitating or coagulating bath 14 which consists of NMM0 ~857-MR
and water and preferably has an NMM0 concentration well above 25% and preferably in the range of 28 to 45% and most preferably somewhat above 40% in NMM0 by weight. The temperature of the precipitating solution is ~aintained at or below 0C by a cooling coil 15 immersed in the precipitating bath and connected to a refrigerating unit 16.
Brine or some other coolant chilled by th~
refrigerating unit 16 to a temperature below O~C can be circulated through the cooling coil, the fiber 17 produced in the precipitating bath is fed to a yarn take-up system 20 which can include a yarn or fiber washing station.
The washing liquid can be returned to an inlet 21 of the bath regenerating unit 22 from which a distillate can be fed at 23 to the fiber washing station while a retentate 24 having a high NMM0 concentration can be supplied to the vessel in which the spinning solution is prepared. From the bath regenerating unit, a line 25 returns precipitating solution with a high NMM0 concentration at a temperature below 0C to the vessel 26 for the bath 14.
The following examples compare the invention with the prior art and demonstrate the effect of the maintenance of a bath temperature below O-C.
E amples 1 - 6 2276g of cellulose (solids or dry content 94%, DP 750, DP = mean degree of polymerization, alpha = 9a%) and 0.02% by weight gallic acid propylester are suspended in 26139g of 60%
aqueous N-methylmorpholine-N-oxide solution.
7857-~R
Over a period of 2 hours at 100-C and at a vacuum of 50 to 300 mbar, 9415 g of water is distilled off. The resulting spinning solution substantially had the following composition:
10% by weight cellulose, 12% by weight water, 78% by weight NMMO and the gallic acid propylester. This solution was forced through a spinneret with 589 holes ~hole diameter 130 micrometers); the spinning temperature was 75-C. The resulting fibers, after stretching in an air gap, are coagulated in an NMMO-containing precipitating bath. The titer, the NMMO concentration in the precipitating bath and the temperature of the precipitating bath for the individual examples are glven in the following table. From this table the ~iber characteristics can be seen as well. In the table:
FFk Fiber tenacity (conditioned) FDk Fiber elongation (conditloned) SF Loop tenacity.
'7 8 5 7- MR
o Ul ~` V
~ ~ ~-x, ~ ID ~D
Z
O
o o ~ o ~-- o ~ e O ,~ ~ T ¦ ~
~ _. C
~ - Z ~
. ' ~ CD ~D
O ~
~n ... .
J~ r,~ 3 ~~ ~ .r~
7857-~R
Examples 1 and 2 represent the state of the art. In Example 1 the precipitating bath consists of puxe water while in Example 2 the bath consists of water with 20% NMMO. The precipitating bath temperatures are relatively high (15 or ll-C~. The cellulose fibers which are formed in these baths have satisfactory characteristics. In Example 3, an attempt is made to raise the NMMO concentration in the precipitating bath to 40% but the fiber characteristics are significantly poorer.
Examples 4-6 represent the invention, i.e. a process using a precipitating bath with a temperature of 0C at the most. In these examples, an increase in the NMMO
concentration in the precipitating bath has presently less effect on the fiber characteristics and in the case of Example 5, fiber characteristics are the same as those of Example 1 in spite of a substantially higher NMM0 concentration in the precipitating bath.
SP~CIFI QTION
Field of the Invention Our present invention relates to a process for producing shaped cellulose bodies from a solution of cellulose in N-methylmorpholine-N-oxide (NMMO) and water wherein the solution is shaped and the cellulose precipitated in a precipitating bath containing water and MMMO.
ackground of the Invention U.S. Patent 4,196,282 describes a process in which a eolution of cellulose in N-methylmorpholine-N-oxide (hereina~ter NMMO) and water is formed. Cellulose solutione of thie type can be used to produce cellulose fibers or other ehaped bodies of a cellulose base. For this purpose, the cellulose is extruded by spinning nozzles, e.g. a spinneret, into a precipitating or coagulating bath. The use of a mixture o~ NMMO and water as eolvent has a number of advantages. For example, it allows operation with a closed solvent cycle since NMMO can be recovered and reueed both in dissolving the cellulose for preparing the epinning solution and in the coagulating bath.
*.~ ;~r In the NMMO process, the cellulose dissolved in NMMO
and water is coagulated in an NMMO containing coagulating bath, the fibers are then washed and the washing water recycled to the precipitating bath. In regenerating of the precipitating bath it is evaporated to allow recovery of the NMMO concentrate which can be used to form fresh solutions of the cellulose while the distillate can be employed for washing the fibers.
In prior art systems of this type, the NMMO
concentration in the precipitatinq bath has been limited to about 20 to 25% since higher concentrations appear red to have a detrimental effect on the characteristics of the fibers. It is, of course, desirable to raise the concentration of the NMMO in the precipitating or coagulating bath 80 that smaller quantities of water need to be evaporated to regenerate this bath.
Ob~ects of the Invention It is, therefore, the principal object of the present invention to provide an improved process for the production of shaped articles by the coagulation or precipitation of cellulose from an NMMO and water solution thereof, using an NMMO-containing precipitating or coagulating bath which will yield shaped bodies and especially fibers with good characteristics and yet can have an elevated NMMO
concentration in the precipitating bath.
Another ob;ect of this invention is to provide an improved me~hod of making shaped cellulosic articles whereby the aforementioned drawbacks are avoided.
~
Summary of the Invention These objects are attained, in accordance with the invention, in a process in which a solution of cellulose in NMNO and water is shaped and the shaped solution caused to pass into a precipitating and coagulating bath containing NMMO and water and in which the NMMo concentration is increased beyond that which has been considered to be possible heretofore without detriment to the quality of the shaped articles or fibers produced, by maintaining the temperature of the precipitating bath at 0C at the most.
We have found, quite surprisingly, that when the temperature is held at O~C at the most in the precipitating bath, the NMM0 concentration thereof can be maintained above 40% without detriment to the fiber characteristics of the fibers produced.
De8c~iption o~ the Drawing The above and other objects, features and advantages of the present invention will become more readily apparent from the following description, reference being made to the accompanying drawing, the sole FIGURE of which is a flow diagram illustrating an apparatus for carrying out the method of the invention.
Specific Descri~tion In the drawing, we have shown a spinneret 10 suppl ied with a spinning solution consisting of cellulose dissolved in NMMO and water via a line 11 and from which a plurality of solution streams 12 of which only one has been illustrated, can pass downwardly through an air gap 13 into the precipitating or coagulating bath 14 which consists of NMM0 ~857-MR
and water and preferably has an NMM0 concentration well above 25% and preferably in the range of 28 to 45% and most preferably somewhat above 40% in NMM0 by weight. The temperature of the precipitating solution is ~aintained at or below 0C by a cooling coil 15 immersed in the precipitating bath and connected to a refrigerating unit 16.
Brine or some other coolant chilled by th~
refrigerating unit 16 to a temperature below O~C can be circulated through the cooling coil, the fiber 17 produced in the precipitating bath is fed to a yarn take-up system 20 which can include a yarn or fiber washing station.
The washing liquid can be returned to an inlet 21 of the bath regenerating unit 22 from which a distillate can be fed at 23 to the fiber washing station while a retentate 24 having a high NMM0 concentration can be supplied to the vessel in which the spinning solution is prepared. From the bath regenerating unit, a line 25 returns precipitating solution with a high NMM0 concentration at a temperature below 0C to the vessel 26 for the bath 14.
The following examples compare the invention with the prior art and demonstrate the effect of the maintenance of a bath temperature below O-C.
E amples 1 - 6 2276g of cellulose (solids or dry content 94%, DP 750, DP = mean degree of polymerization, alpha = 9a%) and 0.02% by weight gallic acid propylester are suspended in 26139g of 60%
aqueous N-methylmorpholine-N-oxide solution.
7857-~R
Over a period of 2 hours at 100-C and at a vacuum of 50 to 300 mbar, 9415 g of water is distilled off. The resulting spinning solution substantially had the following composition:
10% by weight cellulose, 12% by weight water, 78% by weight NMMO and the gallic acid propylester. This solution was forced through a spinneret with 589 holes ~hole diameter 130 micrometers); the spinning temperature was 75-C. The resulting fibers, after stretching in an air gap, are coagulated in an NMMO-containing precipitating bath. The titer, the NMMO concentration in the precipitating bath and the temperature of the precipitating bath for the individual examples are glven in the following table. From this table the ~iber characteristics can be seen as well. In the table:
FFk Fiber tenacity (conditioned) FDk Fiber elongation (conditloned) SF Loop tenacity.
'7 8 5 7- MR
o Ul ~` V
~ ~ ~-x, ~ ID ~D
Z
O
o o ~ o ~-- o ~ e O ,~ ~ T ¦ ~
~ _. C
~ - Z ~
. ' ~ CD ~D
O ~
~n ... .
J~ r,~ 3 ~~ ~ .r~
7857-~R
Examples 1 and 2 represent the state of the art. In Example 1 the precipitating bath consists of puxe water while in Example 2 the bath consists of water with 20% NMMO. The precipitating bath temperatures are relatively high (15 or ll-C~. The cellulose fibers which are formed in these baths have satisfactory characteristics. In Example 3, an attempt is made to raise the NMMO concentration in the precipitating bath to 40% but the fiber characteristics are significantly poorer.
Examples 4-6 represent the invention, i.e. a process using a precipitating bath with a temperature of 0C at the most. In these examples, an increase in the NMMO
concentration in the precipitating bath has presently less effect on the fiber characteristics and in the case of Example 5, fiber characteristics are the same as those of Example 1 in spite of a substantially higher NMM0 concentration in the precipitating bath.
Claims (6)
1. A process for producing a shaped cellulosic article which comprises the steps of:
(a) forming a solution of cellulose in N-methylmorpholine-N-oxide and water;
(b) shaping said solution:
(c) passing the shaped solution through an air gap into a precipitating bath containing water and N-methylmorpholine-N-oxide to coagulate the cellulose and form said article; and (d) maintaining the temperature of said bath during the coagulation of cellulose to form said article therein at 0°C at the most.
(a) forming a solution of cellulose in N-methylmorpholine-N-oxide and water;
(b) shaping said solution:
(c) passing the shaped solution through an air gap into a precipitating bath containing water and N-methylmorpholine-N-oxide to coagulate the cellulose and form said article; and (d) maintaining the temperature of said bath during the coagulation of cellulose to form said article therein at 0°C at the most.
2. The method defined in claim 1 wherein the concentration of N-methylmorpholine-N-oxide in said precipitating bath is maintained above 28%.
3. The method defined in claim 1 wherein the concentration of N-methylmorpholine-N-oxide in said precipitating bath is maintained at about 30 to 40%.
4. The method defined in claim 3, further comprising the step of passing said shaped solution through an air gap before contacting it with said precipitating bath.
5. The method defined in claim 4, further comprising stretching said solution in said air gap.
6. The method defined in claim 5 wherein said solution is shaped by pressing it through an orifice in a spinneret to form a fiber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT2482/90 | 1990-12-07 | ||
| AT0248290A AT395724B (en) | 1990-12-07 | 1990-12-07 | METHOD FOR PRODUCING CELLULOSE MOLDED BODIES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2057133A1 true CA2057133A1 (en) | 1992-06-08 |
Family
ID=3535104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002057133A Abandoned CA2057133A1 (en) | 1990-12-07 | 1991-12-05 | Method of producing shaped cellulosic articles |
Country Status (23)
| Country | Link |
|---|---|
| US (1) | US5216144A (en) |
| EP (1) | EP0490870B1 (en) |
| JP (1) | JPH06108305A (en) |
| AT (1) | AT395724B (en) |
| BG (1) | BG51354A3 (en) |
| BR (1) | BR9105277A (en) |
| CA (1) | CA2057133A1 (en) |
| CZ (1) | CZ281926B6 (en) |
| DE (1) | DE59108655D1 (en) |
| ES (1) | ES2102999T3 (en) |
| FI (1) | FI915573A (en) |
| GR (1) | GR3023257T3 (en) |
| HU (1) | HU209729B (en) |
| MX (1) | MX9102430A (en) |
| NO (1) | NO303737B1 (en) |
| PL (1) | PL169047B1 (en) |
| PT (1) | PT99695B (en) |
| RO (1) | RO107702B1 (en) |
| RU (1) | RU2058442C1 (en) |
| TR (1) | TR25835A (en) |
| TW (1) | TW199897B (en) |
| YU (1) | YU186391A (en) |
| ZA (1) | ZA919517B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5451364A (en) * | 1992-01-17 | 1995-09-19 | Viskase Corporation | Cellulose food casing manufacturing method |
| US5603884A (en) * | 1994-11-18 | 1997-02-18 | Viskase Corporation | Reinforced cellulosic film |
| EP2719801A1 (en) | 2012-10-10 | 2014-04-16 | Aurotec GmbH | Spinning bath and method for solidifying a moulded part |
| EP3505659A1 (en) | 2018-08-30 | 2019-07-03 | Aurotec GmbH | Method and device for filament spinning with inflection |
Families Citing this family (33)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USH1592H (en) * | 1992-01-17 | 1996-09-03 | Viskase Corporation | Cellulosic food casing |
| AT399348B (en) * | 1993-05-05 | 1995-04-25 | Chemiefaser Lenzing Ag | FORM- OR SPIDING MASS CONTAINING CELLULOSE AND USE OF CERTAIN SUBSTANCES FOR YOUR STABILIZATION |
| US5354371A (en) † | 1993-05-28 | 1994-10-11 | Courtaulds Fibres (Holdings) Limited | Transport of solutions of cellulose through pipes |
| AT399519B (en) * | 1993-09-14 | 1995-05-26 | Chemiefaser Lenzing Ag | FORM- OR SPINNING CONTAINER CONTAINING CELLULOSE AND METHOD FOR PRODUCING CELLULOSIC MOLDED BODIES |
| DE4441468C2 (en) * | 1994-11-22 | 2000-02-10 | Ostthueringische Materialpruef | Process for the production of a homogeneous solution of cellulose in water-containing N-methylmorpholine-N-oxide |
| DE4444140A1 (en) * | 1994-12-12 | 1996-06-13 | Akzo Nobel Nv | Solvent-spun cellulosic filaments |
| JPH10511144A (en) * | 1994-12-15 | 1998-10-27 | アクゾ ノーベル ナムローゼ フェンノートシャップ | Method for producing cellulosic molded article |
| DE4446491C2 (en) * | 1994-12-23 | 2000-06-15 | Fraunhofer Ges Forschung | Process for the production of cellulose fibers and cellulose fibers with reduced tendency to fibrillate |
| AT403057B (en) * | 1995-05-09 | 1997-11-25 | Chemiefaser Lenzing Ag | METHOD FOR PRODUCING CELLULOSIC MOLDED BODIES |
| TW353115B (en) * | 1995-12-21 | 1999-02-21 | Courtaulds Fibres Holdings Ltd | Method of making lyocell filaments; method of manufacture of a cellulose filament from a solution of cellulose in an amine oxide solvent |
| TW339367B (en) * | 1996-03-23 | 1998-09-01 | Akzo Nobel Nv | Process for manufacturing cellulosic fibers with a reduced tendency to form fibrils |
| US6210801B1 (en) | 1996-08-23 | 2001-04-03 | Weyerhaeuser Company | Lyocell fibers, and compositions for making same |
| US6471727B2 (en) | 1996-08-23 | 2002-10-29 | Weyerhaeuser Company | Lyocell fibers, and compositions for making the same |
| 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 |
| US6096258A (en) * | 1998-01-20 | 2000-08-01 | Viskase Corporation | Method and apparatus for forming a cellulose article including solvent recovery means |
| US5929228A (en) * | 1998-02-09 | 1999-07-27 | Cheng; Meng-Song | Cellulose solution with low viscosity and process of preparing the same |
| US6773648B2 (en) | 1998-11-03 | 2004-08-10 | Weyerhaeuser Company | Meltblown process with mechanical attenuation |
| SE0003125D0 (en) * | 2000-09-05 | 2000-09-05 | Astrazeneca Ab | Modified polymers |
| KR20020048785A (en) * | 2000-12-18 | 2002-06-24 | 조 정 래 | Preparation of cellulose solution |
| AT410319B (en) * | 2001-07-25 | 2003-03-25 | Chemiefaser Lenzing Ag | CELLULOSE SPONGE AND METHOD FOR THE PRODUCTION THEREOF |
| DE10200405A1 (en) | 2002-01-08 | 2002-08-01 | Zimmer Ag | Cooling blowing spinning apparatus and process |
| DE10204381A1 (en) | 2002-01-28 | 2003-08-07 | Zimmer Ag | Ergonomic spinning system |
| DE10206089A1 (en) | 2002-02-13 | 2002-08-14 | Zimmer Ag | bursting |
| AT6807U1 (en) * | 2004-01-13 | 2004-04-26 | Chemiefaser Lenzing Ag | CELLULOSIC FIBER OF THE LYOCELL GENERATION |
| DE102004024030A1 (en) | 2004-05-13 | 2005-12-08 | Zimmer Ag | Lyocell process with polymerization-degree-dependent adjustment of the processing time |
| DE102008018745A1 (en) * | 2008-04-14 | 2009-10-15 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Cellulose carbamate spinning solution, cellulose carbamate blown film and process for their preparation and uses |
| DE102008018743A1 (en) * | 2008-04-14 | 2009-10-22 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Cellulose carbamate spinning solution, cellulose carbamate fiber and process for their preparation and uses |
| DE102008018746A1 (en) * | 2008-04-14 | 2009-10-15 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Cellulose-carbamate spinning solution, process for producing a cellulose-carbamate-nonwoven, cellulose-carbamate-nonwoven and uses |
| WO2014162062A1 (en) | 2013-04-04 | 2014-10-09 | Aalto University Foundation | Process for the production of shaped cellulose articles |
| WO2018138416A1 (en) | 2017-01-30 | 2018-08-02 | Aalto University Foundation Sr | A process for making a cellulose fibre or film |
| EP3536829A1 (en) * | 2018-03-06 | 2019-09-11 | Lenzing Aktiengesellschaft | Lyocell fiber with viscose like properties |
| WO2023180181A1 (en) | 2022-03-21 | 2023-09-28 | Phoenxt Pty. Ltd | Regenerating cellulose from waste textile |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2179181A (en) * | 1936-04-21 | 1939-11-07 | Soc Of Chemical Ind | Cellulose solutions and process of making same |
| US2322427A (en) * | 1941-08-19 | 1943-06-22 | Edelstein Sidney Milton | Cellulose product |
| US3447939A (en) * | 1966-09-02 | 1969-06-03 | Eastman Kodak Co | Compounds dissolved in cyclic amine oxides |
| US3758458A (en) * | 1971-12-08 | 1973-09-11 | Fmc Corp | Low d p high d p viscose mixture using high cellulose concentration |
| US3767756A (en) * | 1972-06-30 | 1973-10-23 | Du Pont | Dry jet wet spinning process |
| US4246221A (en) * | 1979-03-02 | 1981-01-20 | Akzona Incorporated | Process for shaped cellulose article prepared from a solution containing cellulose dissolved in a tertiary amine N-oxide solvent |
| US4416698A (en) * | 1977-07-26 | 1983-11-22 | Akzona Incorporated | Shaped cellulose article prepared from a solution containing cellulose dissolved in a tertiary amine N-oxide solvent and a process for making the article |
| US4324593A (en) * | 1978-09-01 | 1982-04-13 | Akzona Incorporated | Shapeable tertiary amine N-oxide solution of cellulose, shaped cellulose product made therefrom and process for preparing the shapeable solution and cellulose products |
| JPS60139873A (en) * | 1983-12-26 | 1985-07-24 | 旭化成株式会社 | Modification of fiber material |
| FR2617511B1 (en) * | 1987-07-01 | 1989-12-15 | Inst Textile De France | PROCESS FOR THE PREPARATION OF A CELLULOSE SPINNING SOLUTION IN THE PRESENCE OF TERTIARY AMINE OXIDE AND ADDITIVE |
-
1990
- 1990-12-07 AT AT0248290A patent/AT395724B/en not_active IP Right Cessation
-
1991
- 1991-11-26 FI FI915573A patent/FI915573A/en not_active Application Discontinuation
- 1991-11-26 JP JP3310642A patent/JPH06108305A/en active Pending
- 1991-11-27 YU YU186391A patent/YU186391A/en unknown
- 1991-12-03 TR TR91/1107A patent/TR25835A/en unknown
- 1991-12-03 ZA ZA919517A patent/ZA919517B/en unknown
- 1991-12-03 RO RO148885A patent/RO107702B1/en unknown
- 1991-12-05 CA CA002057133A patent/CA2057133A1/en not_active Abandoned
- 1991-12-05 PT PT99695A patent/PT99695B/en not_active IP Right Cessation
- 1991-12-05 BG BG95579A patent/BG51354A3/en unknown
- 1991-12-06 CZ CS913711A patent/CZ281926B6/en not_active IP Right Cessation
- 1991-12-06 RU SU915010202A patent/RU2058442C1/en active
- 1991-12-06 HU HU913845A patent/HU209729B/en not_active IP Right Cessation
- 1991-12-06 ES ES91890299T patent/ES2102999T3/en not_active Expired - Lifetime
- 1991-12-06 DE DE59108655T patent/DE59108655D1/en not_active Expired - Fee Related
- 1991-12-06 EP EP91890299A patent/EP0490870B1/en not_active Expired - Lifetime
- 1991-12-06 PL PL91292664A patent/PL169047B1/en unknown
- 1991-12-06 BR BR919105277A patent/BR9105277A/en not_active Application Discontinuation
- 1991-12-06 NO NO914809A patent/NO303737B1/en unknown
- 1991-12-06 US US07/804,335 patent/US5216144A/en not_active Expired - Fee Related
- 1991-12-06 MX MX9102430A patent/MX9102430A/en unknown
- 1991-12-07 TW TW080109607A patent/TW199897B/zh active
-
1997
- 1997-04-22 GR GR970400922T patent/GR3023257T3/en unknown
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5451364A (en) * | 1992-01-17 | 1995-09-19 | Viskase Corporation | Cellulose food casing manufacturing method |
| US5603884A (en) * | 1994-11-18 | 1997-02-18 | Viskase Corporation | Reinforced cellulosic film |
| EP2719801A1 (en) | 2012-10-10 | 2014-04-16 | Aurotec GmbH | Spinning bath and method for solidifying a moulded part |
| EP3505659A1 (en) | 2018-08-30 | 2019-07-03 | Aurotec GmbH | Method and device for filament spinning with inflection |
| WO2020043860A1 (en) | 2018-08-30 | 2020-03-05 | Aurotec Gmbh | Method and device for filament spinning with deflection |
| US11946165B2 (en) | 2018-08-30 | 2024-04-02 | Aurotec Gmbh | Method and device for filament spinning with deflection |
Also Published As
| Publication number | Publication date |
|---|---|
| NO303737B1 (en) | 1998-08-24 |
| FI915573A0 (en) | 1991-11-26 |
| PL292664A1 (en) | 1992-08-24 |
| JPH06108305A (en) | 1994-04-19 |
| CS371191A3 (en) | 1992-06-17 |
| RU2058442C1 (en) | 1996-04-20 |
| EP0490870B1 (en) | 1997-04-09 |
| HUT63642A (en) | 1993-09-28 |
| ATA248290A (en) | 1992-07-15 |
| PT99695A (en) | 1992-10-30 |
| AT395724B (en) | 1993-02-25 |
| PL169047B1 (en) | 1996-05-31 |
| HU209729B (en) | 1994-10-28 |
| US5216144A (en) | 1993-06-01 |
| DE59108655D1 (en) | 1997-05-15 |
| FI915573A (en) | 1992-06-08 |
| CZ281926B6 (en) | 1997-04-16 |
| NO914809L (en) | 1992-06-09 |
| TW199897B (en) | 1993-02-11 |
| PT99695B (en) | 1999-05-31 |
| GR3023257T3 (en) | 1997-07-30 |
| MX9102430A (en) | 1992-07-01 |
| BG51354A3 (en) | 1993-04-15 |
| RO107702B1 (en) | 1993-12-30 |
| NO914809D0 (en) | 1991-12-06 |
| EP0490870A3 (en) | 1993-03-17 |
| ZA919517B (en) | 1992-09-30 |
| EP0490870A2 (en) | 1992-06-17 |
| BR9105277A (en) | 1992-08-18 |
| ES2102999T3 (en) | 1997-08-16 |
| TR25835A (en) | 1993-09-01 |
| YU186391A (en) | 1994-06-10 |
| HU913845D0 (en) | 1992-04-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |