EP2268857B1 - Cellulosic mouldings - Google Patents

Description

The present invention relates to cellulosic moldings having a maximum tensile force of at least 30 cN / tex, prepared by dry-wet-forming polymer solutions containing predominantly cellulose in a solvent.

In particular, the present invention relates to so-called technical cellulose multifilament game, which are high-strength molded body made of cellulose with a proportion of less than 50% of other polymers and / or additives.

The dry-wet deformation is preferably carried out by precipitation.

Such moldings are known from a number of publications.

For example, the DE-A-4 444 140 in the claims solvent-spun cellulosic filaments of a solution of cellulose in a tertiary amine N-oxide and optionally water having a strength of 50 to 80 cN / tex and an elongation at break of 6 to 25%. From the corresponding examples, it can be seen, however, that with a maximum tensile strength or tear strength of 65.3 cN / tex, an elongation of 6.3% is associated and results in a tensile strength of 53.2 cN / tex, an elongation of 13%. Due to lack of feasibility, the claimed areas in the granted patent EP-B-0797694 then limited to a range of 52.7 to 66 cN / tex for the strength and 6 to 13% for the elongation.

The WO 2006/000197 discloses a process for the preparation of shaped articles of cellulose with ionic liquids as solvent, in which the cellulose is dissolved, the solution is shaped into fibers or membranes, the cellulose is regenerated by precipitation in aqueous solutions, the solvent is removed by washing and the shaped articles dries. According to WO 2006/000197 In this way fibers with very high tensile strengths and moduli in the conditioned and wet state are obtained. According to the table on page 17 of this prior publication, tensile strengths of up to 67.7 cN / tex in the conditioned state are achieved with simultaneous breaking elongations of 9.0%.

The terms tear strength, tensile strength, breaking strength and maximum tensile force are used interchangeably in this application and refer to the fineness-related force that has to be used for tearing or breaking the cellulosic molding.

The elongation of the molded article measured during tearing or breakage of the molded article is based on its original length and referred to as elongation at break, maximum tensile elongation at break or else elongation at break in the form of the percentage increase in length.

Although very high values for tear strength and also for elongation at break are already disclosed in the prior art, the theoretically possible limits of these properties are far from being reached. The described moldings with very high values for tear resistance generally have low elongation values. In particular, for technical applications, it is desirable to have moldings available that also have sufficient expansion reserves at very high strength values.

AV:

Arbeitsvermögen in J/g

σ:

Höchstzugkraft im konditionierten Zustand [cN/tex]

ε:

Höchstzugkraftdehnung im konditionierten Zustand [%]

von mindestens 80 J/g aufweisen, bevorzugt von mindestens 82 J/g, noch bevorzugter von mindestens 85 J/g und am meisten bevorzugt von mindestens 90 J/g. Die Obergrenze des Arbeitsvermögens ist nicht mehr als 120 J/g. The present invention solves this problem by providing solvent-spun cellulosic moldings having a maximum tensile force of at least 30 cN / tex from a solution containing predominantly cellulose in a solvent, these cellulosic moldings being characterized in that they have a working capacity, determined from the mathematical product of maximum tensile strength and maximum tensile elongation according to (1) $$\mathrm{AV}\left[\mathrm{J}\mathrm{/}\mathrm{G}\right]\mathrm{=}\mathrm{0}\mathrm{.}\mathrm{1}\mathrm{*}\mathrm{\sigma }\mathrm{*}\mathrm{\epsilon }$$

AV:

Working capacity in y / g

σ:

Maximum tensile force in the conditioned state [cN / tex]

ε:

Maximum tensile strain in the conditioned state [%]

of at least 80 J / g, preferably of at least 82 J / g, more preferably of at least 85 J / g, and most preferably of at least 90 J / g. The upper limit of working capacity is not more than 120 J / g.

The shaped bodies according to the invention thus also show at the same time a very high tear strength and a high elongation at break, a combination which is not disclosed in the prior art.

Although, for example, in the EP-B-0797694 - and especially in the DE-A-4 444 140 - Strength and elongation ranges are given in the claims, which purely mathematically lead to higher values for the working capacity, as in the present invention, it is - in the light of the examples in the prior art - but clearly visible that these are limits which have been achieved individually but not simultaneously. Reasonably enough, the skilled person will also not expect that products can be produced in which opposing limit values tend to be met at the same time. It is therefore clear that the individual parameters are in each case reachable up to their limit values, even if not in combination with all other limit values. On the contrary, the person skilled in the art knows that the products for the individual property parameters can be produced within the specified overall range, provided that the other claimed property parameters are simultaneously also satisfied in a reasonable margin.

In Example 3 in the WO 2007/128268 For example, fibers of a (60:40) mixture of a cotton linter pulp with polyacrylonitrile are disclosed which have a working capacity of about 87 J / g. The in the WO 2007/128268 However, fibers described at the same time have a very low strength of only 25.4 cN / tex and are therefore not suitable for use as technical multifilament yarns.

Of the WO 97/33020 Finally, it can be seen that the length of the distance, on which the filaments are led to the haul-off device, has an influence on the working capacity of the fiber in that the working capacity decreases sharply when the distance is greater than 12 m. The WO 97/33020 shows a working capacity of 41 J / g at a distance between nozzle and godet of 12 m, 38 J / g at 25 m and 45.5 J / g at 48 m. An extrapolation to a distance of 0 would consequently result in a working capacity of approx. 50 to 60 J / g, as shown in Table 1 of the WO 97/33030 is shown.

From the published a few years later WO 02/18682 The skilled person can see that between the working capacity of the fibers (product of tensile strength and elongation at break in J / g) and the strain rate, although a dependency, this is low. The WO 02/18682 contains - despite a corresponding reference to it - no drawings. If one looks in the corresponding priority application, one recognizes that even at an (extrapolated) strain rate of less than 5 sec ^-1 at the specified constant strength of about 41 cN / tex a working capacity of over 80 J / g would not be achieved. The WO 02/18682 recommends spinning at a strain rate in the range of 15-40 sec- ¹ , thus teaching WO 02/18682 a working capacity of about 58 to 65 J / g.

Accordingly, a combination of the two prior art documents would not lead one skilled in the art to the invention described in this application.

It is therefore to be noted that the combination of properties claimed in the present invention is not described in the prior art and is also not suggested. On the contrary: Cellulosic fibers are among the oldest technical fibers and despite decades of intensive research, development and production, fibers with a working capacity of> 80 J / g could not be achieved. In particular, molded articles with the claimed Parameters also not obvious, since it is firstly surprising that obviously opposite properties, such as strength and elongation, are achieved at the same time to such a degree. On the other hand, for the preparation of the cellulosic molded bodies according to the invention, it is preferable to comply with certain conditions, as will be described in more detail below. Of course, this applies even more to areas of working capital over 85 J / g.

In particular, the maximum tensile force of the claimed molded articles is in a range of 40 to 90 cN / tex, preferably 45 to 85 cN / tex, more preferably 50 to 80 cN / tex, most preferably 55 to 75 cN / tex.

Suitable solvents are the known direct solvents for cellulose, such as N-methylmorpholine-N-oxide (NMMO), into consideration. It is likewise preferred if the solvent from which the cellulosic molded bodies are produced is an ionic liquid or mixtures of ionic liquids.

Preferred ionic liquids are those which have imidazolium-based cations and halide or acetate anions, in particular 1,3-dialkylimidazolium halides and acetates and more preferably the 1-butyl-3-methylimidazolium chloride and the 1-ethyl-3-one methylimidazolium acetate and / or mixtures thereof.

The cellulosic shaped bodies preferably consist of a pulp which has an α-cellulose content of greater than 90%, preferably greater than 96%, and particularly preferably greater than 98%.

Furthermore, it is advantageous if the cellulose is a pulp which has an average degree of polymerisation (DP), determined by means of the cuoxam method, of> 600, preferably> 650.

The preparation of the cellulosic molded bodies according to the invention is preferably carried out by enzymatic and / or hydrolytic pretreatment of the pulps used. These pretreatments are used to widen the molecular weight distribution targeted, the molecular weights are reduced.

Since normally the reduction of the molar mass leads to lower strengths, it is all the more surprising that very stable spinning conditions can be realized with simultaneously good high strengths and very high strains by these pretreatments.

In addition to the enzymatic and hydrolytic pretreatment, the discontinuity of the spinning solutions can also be adjusted by the targeted mixing of pulps and by the addition of secondary polymers.

Favorable for achieving the desired fiber properties is the interaction between the use of a high molecular weight cellulose with a high alpha-cellulose content and a relatively high concentration of the solution, which should be above 10% solids content. In addition, care should be taken after spinning to ensure that the filaments are not damaged by the washing process and drying process.

It is particularly preferred if the cellulosic shaped bodies are filaments or fibers.

These fibers or filaments preferably have a cuoxamide DP greater than 550, more preferably greater than 600.

The production of the moldings according to the invention succeeds excellently when the angular velocity (or the shear rate proportional thereto) at the "cross-over" is in a range from 0.5 to about 2 rad / sec. If the solvent used is NMMO, this angular velocity is preferably between about 1 and 2 rad / sec, for ionic liquids preferably between about 0.5 and 1.

The angular velocity at the "cross-over" corresponds to the width molecular weight distribution and the average molecular weight of the polymers involved in the interlocking network. The "cross over" itself is the crossing point between the memory and loss modulus of the master curve (see: Schrempf, C .; Shield, G .; Rüf, H., "Pulp-NMMO solutions and their flow properties", Das Papier 12 (1995) 748-757 ).

It is a merit of the invention that a "window" (optimum) in the molecular weight and molecular weight distribution - expressed by the angular velocity or their proportional shear rate - was found, which makes the cellulosic moldings according to the invention with the high capacity for the first time accessible. This is not obvious, therefore, because said shear rate is a function of several parameters, such as i.a. the concentration of the pulp in the solvent, the solvent itself and the solution state of the pulp in the solvent.

If the cellulosic shaped bodies are filaments, they preferably have a DP determined by means of Cuoxam of> 550.

The invention is therefore also directed to the use of such cellulosic filaments for the production of technical yarns and for the production of tire cords and of cords and textile reinforcement fabrics. Moreover, the cellulosic filaments of the present invention are particularly useful for reinforcing elastomers, plastics (e.g., thermoplastics, biopolymers, and biodegradable polymers) and thermosetting molding materials (resins).

It is further a merit of the invention to have found that the mechanical possibilities to improve the working capacity after the thread or filaments have left the air gap are very limited and in particular can not provide cellulosic shaped bodies having the properties according to the invention.

The invention will be described in more detail with reference to some examples below. Of course, these examples are illustrative only and are in no way to be considered as limiting.

The following measurement or determination methods were used to determine the experimental results:

The determination of the textile properties (strength, elongation, fineness) of the fibers and filaments was carried out in the test climate according to DIN 50014-20 / 65 at 20 ° C and 65% relative humidity.

The sampling was carried out in accordance with DIN 53 803-T2. The tensile tests on the fiber were carried out according to DIN EN ISO 5079 under the following conditions:

The clamping length was 20 mm and the pulling speed was 20 mm / min with a preload weight of 0.6 ± 0.06 cN / tex. The measurements were carried out on 50 fibers each.

The rheological characterization of the cellulosic spinning solutions was carried out using a HAAKE MARS rheometer with a cone / plate measuring device (sensor C35 / 4 ° or C20 / 4 °).

Zero shear viscosities were measured by creep using a constant shear stress of 90 Pa at a measurement temperature of 85 ° C.

To determine the crossing point between the memory and loss modulus of the master curve ("cross over" values) and the plateau moduli, oscillation measurements were carried out at 3 temperatures and the master curves were calculated by WLF transformation to a reference temperature. The measurements were carried out at different temperatures depending on the solvent used. The characterization of cellulose solutions in NMMO was carried out at 60/85 and 110 ° C, and the calculation of the master curve was carried out at a reference temperature of 85 ° C. Polymer solutions in ionic Liquids were analyzed at 95/115 and 135 ° C, with the reference temperature for calculating the master curve being 95 ° C.

The determination of the average degree of polymerization (DP) of the cellulose was carried out by the Cuoxam method. The intrinsic viscosities [η] (unit ml / g) were determined with the aid of a capillary viscometer and determined according to the following equation of the Cuoxam-DP: $$\mathrm{cuprammonium}\mathrm{-}\mathrm{DP}\mathrm{=}\mathrm{2}\mathrm{\cdot }{\left[\mathrm{\eta }\right]}_{\mathrm{cuprammonium}}$$

The α-cellulose content is the part of the pulp which is resistant to 17.5% sodium hydroxide solution in certain types of treatment.

The determination of the α-cellulose content was carried out by treating the pulp with 17.5% aqueous NaOH solution at 20 ° C for 1 h and then washing, drying and reweighing of the pulp.

The solids content was determined by precipitation, washing and drying of the cellulose.

The invention will be explained by the following examples:

Comparative Example 1 (prior art)

A lyocell pulp (eucalyptus sulfite pulp, cuoxam DP: 556, α-cellulose content: 93.8%) was added 1:20 in water to a liquor ratio and pressed to a moisture content of 60% by mass. 70 g of this moist cellulose were dispersed in 317 g of 1-butyl-3-methylimidazolium chloride (BMIMCI) containing 30% by weight of water and stabilizer additives (0.2% NaOH, 0.02% propyl gallate based on the polymer solution to be prepared) , This gives 390 g of a homogeneous suspension, which is introduced into a vertical kneader and under shear, rising temperature of 80 to 125 ° C and decreasing pressure of 800 to 20 mbar Wasserentfemung is transferred into a microscopically homogeneous solution. The solution contains 11.2% by mass of cellulose and 88.8% by mass of BMIMCI, was analytically characterized and formed by dry-wet spinning into 1.73 dtex fibers. The data of the analytical solution characterization, spinning conditions and fiber values are shown in the table.

Comparative Example 2 (prior art)

33.4 g of a eucalyptus pulp (8% by mass of moisture, Cuoxam-DP: 556) are dispersed in a liquor ratio of 1:20 to the single fiber and then pressed to a water content of 60% by mass. The cellulose, which is moist by press, is introduced into 380 g of an N-methylmorpholine-N-oxide (NMMO) solution with a water content of 50%, which contains as stabilizers propyl gallate (0.03%, based on the polymer solution to be prepared) and sodium hydroxide solution according to the base consumption Contains substances, introduced and dispersed. The prepared suspension is placed in a vertical kneader, under shear, increasing temperature of 70 to 95 ° C and decreasing pressure of 750 to 50 mbar the water removed to the level of monohydrate and a microscopically homogeneous cellulose solution having the composition 12.3 mass% Cellulose, 76.0% by mass of NMMO and 11.7% by mass of water. The refractive index of the solution at 50 ° C was 1.4876. The prepared solution was analytically characterized and formed by dry-wet spinning to 1.66 dtex fibers. The data of the analytical solution characterization, spinning conditions and fiber values are shown in the table.

Comparative Example 3

Analogously to Comparative Example 1, a 12.0% by mass solution of a pulp (Cuoxam-DP: 798) having a narrow molecular weight distribution and a high α-cellulose content (98.4% of α-cellulose) was prepared in the solvent BMIMCI. The manufactured Cellulose solution could only be deformed very uncertainly by dry-wet spinning process to fibers of a fineness of 1.74 dtex, since the solution did not have sufficient delay due to their rheological properties. The data of the analytical solution characterization, spinning conditions and fiber values are shown in the table.

Examples 4 and 5

The pulp used in Comparative Example 3 (Cuoxam DP: 798, 98.4% α-cellulose) was dispersed in water at a ratio of 1:20 in water and adjusted by the addition of dilute formic acid to a pH of 5.0. At 45 ° C., an enzymatic pretreatment of the pulp was carried out within 60 minutes with 0.5% of a cellulase with high exoactivity (filter paper activity 90 U / ml), based on cellulose. Enzymatic pretreatment provides only a small reduction in the cuoxam DP of the pulp to a DP of 745, as well as a targeted change in non-uniformity, i. the molecular weight distribution of cellulose.

The pulp suspension from the enzyme treatment is pressed after increasing the pH to 11 to a water content of 60% and in each case 78.1 g of this press-moist cellulose used to prepare 12.5% strength cellulose solutions in BMIMCI. The polymer solutions were deformable with very good spinning reliability by means of dry-wet spinning technology into fibers of a fineness of 1.78 or 1.70 dtex. The data of the analytical solution characterization, spinning conditions and fiber values are shown in the table.

Examples 6 and 7

In order to adjust the non-uniformity of spinning solutions, blends of pulps having a narrow molecular weight distribution and high α-cellulose contents were prepared. For example 6, 23.9 g of a pulp (cuoxam-DP: 798, 98.4% α-cellulose, moisture content: 7%) and 10.1 g of a cotton linter pulp (cuoxam-DP: 443, 98% α-cellulose) were used. Cellulose, moisture content: 6%) in the liquor ratio 1:20 in water and pressed after intensive mixing to a water content of 60%.

For example 7, 23.4 g of a cotton linter pulp (cuoxam DP: 741, 98.3% α-cellulose, moisture content: 5%) and 10.1 g of a cotton linter pulp (cuoxam DP: 443, 98%) were used. α-cellulose, moisture content: 6%) in a liquor ratio of 1:20 in water and pressed after thorough mixing to a water content of 60%.

The moist celluloses were suspended in BMIMCI solutions (water content: 30%, stabilizer addition 0.2% NaOH, 0.02% propyl gallate, based on the polymer solution to be prepared) and transferred by means of vertical kneader under dehydration by shear, temperature and vacuum into microscopically homogeneous spinning masses , The polymer solutions obtained were deformable with very good spinning reliability by means of dry-wet spinning technology into fibers of a fineness of 1.81 or 1.77 dtex. The data of the analytical solution characterization, spinning conditions and fiber values are shown in the table.

Examples 8 and 9:

On a pulp (Cuoxam DP: 798, 98.4% α-cellulose) was carried out analogously to Examples 4 and 5, an enzymatic pretreatment. After this pretreatment, a cuoxam-DP of 745 cellulose was determined.

For Example 8, 72.4 g of this pretreated, moist cellulose (water content: 60%) was thoroughly mixed with 1.52 g of polyethylene glycol 20000 (OH number: 4-7) and mixed with BMIMCl in a 12.2% by mass, transferred homogeneous dope.

For example 9, 74.2 g of the pretreated, moist cellulose (water content: 60%) were intensively mixed with 2.84 g of Tego Phobe 1401 (aqueous emulsion of an amino-functional polysiloxane, polymer content: 55%) and mixed with BMIMCI by means of a laboratory kneader into a 12, 5 mass%, transferred homogeneous dope.

The secondary polymers contained polyethylene glycol or polysiloxane each cause a very homogeneous turbidity of the spinning mass and are present in such a finely divided form that microscopically no individual particles could be identified and no adverse effects on the spinning processes took place. The prepared polymer spun masses were characterized analytically and formed by dry-wet spinning process into fibers with finenesses of 1.97 and 1.73 dtex. The data of the analytical solution characterization, spinning conditions and fiber values are shown in the table.

Examples 10 and 11:

30.9 g of a pulp having a narrow molar mass distribution (cuoxam DP: 798, 98.4% α-cellulose, moisture content: 7%) or 34.5 g of a cotton linter pulp (Cuoxam-DP: 650, 98.2%). α-cellulose, moisture content: 5%) are dispersed after hydrolytic pretreatment in 50% NMMO solution with the addition of stabilizers and converted into 11.5 or 13.1%, microscopically homogeneous polymer solutions in NMMO monohydrate. The polymer solutions obtained were deformable with very good spinning reliability by means of dry-wet spinning technology into fibers of a fineness of 1.7 or 1.79 dtex. The data of the analytical solution characterization, spinning conditions and fiber values are shown in the table.

Example 12:

The polymer solvent used was a mixture of 2 ionic liquids, BMIMCl and 1-hexyl-3-methylimidazolium chloride (HMIMCI) in a mass ratio of 90:10.

79.4 g of the enzyme-pretreated pulp used in Example 8 (Cuoxam-DP: 745, water content: 60%) were dissolved in 311.8 g of an aqueous mixture of the ionic liquids BMIMCI and HMIMCI (mass ratio BMIMCI: HMIMCI = 90:10, Water content: 30%) with the addition of 0.2% NaOH and 0.02% propyl gallate, based on the polymer solution to be prepared. After transfer of this suspension in a vertical kneader was produced by shearing, rising temperature of 103 to 137 ° C and decreasing pressure of 800 to 15 mbar with water removal in a microscopically homogeneous solution. The solution contained 12.7% by mass of cellulose, was characterized analytically and formed by dry-wet spinning process to fibers of a fineness of 2.06 dtex. The data of the analytical solution characterization, spinning conditions and fiber values are shown in the table.

Example 13:

The polymer solvent used was a mixture of 2 ionic liquids, BMIMCI and 1-ethyl-3-methylimidazolium acetate (EMIMAc) in a mass ratio of 90:10.

24.6 g of a pulp with narrow molar mass distribution (cuoxam DP: 798, 98.4% α-cellulose, moisture content: 7%) and 10.4 g of a cotton linter pulp (Cuoxam DP: 432, 98.1% α Cellulose, moisture content: 6%) were added 1:20 in the liquor ratio in water and pressed after thorough mixing to a water content of 60%. The press-moist celluloses were suspended in 309 g of a mixture of the ionic liquids BMIMCI and EMIMAc (mass ratio BMIMCI: EMIMAc = 90:10, water content: 30%) and converted into a homogeneous spinning mass analogously to Example 6. The polymer solution contained 13.1% by mass of cellulose, was characterized analytically and formed by dry-wet spinning process to fibers of a fineness of 1.75 dtex. The data of the analytical solution characterization, spinning conditions and fiber values are shown in the table.

Example 14:

A polymer solution was prepared analogously to Example 13 from a cellulose mixture of the pulps used in Example 13 in a mass ratio of 60:40, using as cellulose solvent a mixture of the ionic liquids BMIMCI and 1-butyl-3-methylimidazolium acetate (BMIMAc) in a mass ratio of 90:10. A microscopically homogeneous polymer solution was obtained, which was 12.6 % By mass cellulose. This was characterized analytically and formed by dry-wet spinning process into fibers of a fineness of 1.72 dtex. The data of the analytical solution characterization, spinning conditions and fiber values are shown in the table. table See 1 See 2 See 3 4 5 6 7 8th 9 10 11 12 13 14 Cuprammonium DP 556 556 798 745 745 798/443 741/443 745 745 798 650 745 798/432 798/432 Analytical solution characterization: solvent BMIMCI NMMO BMIMCI BMIMCI BMIMCI BMIMCI BMIMCI BMIMCI BMIMCI NMMO NMMO BMIMCI + HMIMCI BMIMCI + EMIMAC BMIMCI + BMIMAC Solids content % 11.2 12.3 12.0 12.5 12.5 12.7 12.7 12.2 12.5 11.5 13.1 12.7 13.1 12.6 Zero shear viscosity (85 ° C) Pas 14530 8520 106000 65190 59630 92130 38790 71610 89750 21150 17010 82470 91470 63100 Angular velocity (cross over) rad / s 2.77 2.68 0.34 0.83 0.90 0.70 1.74 0.67 0.54 0.94 1.96 0.70 0.63 0.98 Memory module (crossover) Pa 2696 3079 3177 3961 3976 4166 5625 3852 3313 3686 7500 3888 4090 4359 plateau modulus Pa 13165 27430 24200 24780 24200 28050 27530 25253 23840 29580 47780 25190 28530 26637 Spin conditions: Spinneret hole diameter microns 90 90 100 100 100 100 100 100 100 100 100 100 100 100 Capillary number per nozzle 30 30 30 30 30 30 30 30 30 30 30 30 30 30 Dope temperature ° C 93 84 106 100 98 103 93 101 109 90 88 101 105 101 air gap mm 80 40 35 50 40 40 40 40 30 50 25 40 30 40 off speed m / min 30 30 30 30 30 30 30 30 30 30 30 30 30 30 Fasereiqenschaften: fiber fineness dtex 1.73 1.66 1.74 1.78 1.70 1.81 1.77 1.97 1.73 1.70 1.79 2.06 1.75 1.72 Tear resistance, conditioned CN / tex 50.3 42.3 61.9 67.4 67.3 66.7 67.4 65.1 61.9 49.2 50.8 63.2 68.4 65.0 Elongation at break, conditioned % 11.7 16.1 10.4 12.3 12.8 13.6 12.0 13.4 13.7 20.9 18.4 13.2 13.5 12.5 work capacity J / g 58.9 68.1 64.4 82.9 86.1 90.7 80.9 87.2 84.8 102.8 93.5 83.4 92.3 81.3 Cuoxam-DP fiber 509 513 663 597 604 604 557 724 605 601 627 595

Claims (12)

1. Solvent-spun cellulosic shaped bodies with a breaking tenacity of at least 30 cN/tex, produced by means of a dry-wet process from a polymer solution containing predominantly cellulose in a solvent, characterized in that the cellulosic shaped bodies have a working capacity, determined from the mathematical product of breaking tenacity and elongation at break, of at least 80 J/g to a maximum of 120 J/g.
2. Cellulosic shaped bodies produced according to Claim 1, characterized in that the breaking tenacity lies in a range from 30 to 90 cN/tex.
3. Cellulosic shaped bodies produced according to one or more of the previous claims, characterized in that the solvent is a direct solvent like NMMO.
4. Cellulosic shaped bodies produced according to one or more of the previous claims, characterized in that the solvent is an ionic liquid or a mixture of two or more ionic liquids.
5. Cellulosic shaped bodies produced according to Claim 4, characterized in that the ionic liquid is 1-butyl-3-methylimidazolium chloride or 1-ethyl-3-methylimidazolium acetate and/or mixtures thereof.
6. Cellulosic shaped bodies according to one or more of the previous claims, characterized in that the cellulose is a pulp that has an α-cellulose content greater than 90%, preferably greater than 96%, and particularly preferably greater than 98%.
7. Cellulosic shaped bodies according to one or more of the previous claims, characterized in that the cellulose is a pulp that has an average degree of polymerization of > 600, preferably > 650.
8. Cellulosic shaped bodies according to one or more of the previous claims, characterized in that the cellulosic shaped bodies are filaments or fibers.
9. Method for producing cellulosic filaments or fibers according to Claim 8, characterized in that the cellulosic filaments or fibers are spun from a pulp solution, wherein the angular velocity at the "cross-over" is in the range from 0.5 to approximately 2 rad/sec.
10. Use of cellulosic filaments according to Claim 9 for the production of industrial yarns, cords, and textile reinforcement woven fabrics.
11. Use of cellulosic filaments according to Claim 9 for the production of tire cords.
12. Use of cellulosic filaments according to Claim 9 for the reinforcement of elastomers, plastics, in particular thermoplastics, biopolymers, and biodegradable polymers as well as duroplastic molding compounds, in particular resins.