DE102007050047A1 - Automotive cabin air filter is a porous polymer fleece, fibre layup or woven fibre incorporating a Beta-crystalline structure - Google Patents

Abstract

Claimed is a porous polymer fleece, fibre layup or woven fibre incorporating a Beta-crystalline structure. The average pore diameter is in the range 0.05-1 microns. Between 20 and 65 percent of the polypropylene fibres by weight incorporate a Beta-crystalline structure.

Description

The The present invention relates to a polypropylene fiber material, as well a method for producing the same. The present invention relates to a fiber material, in particular fiber fabric, nonwoven, Fasergewirk and / or Fiber fabric, made of polypropylene fibers, which has a beta-crystallite structure and has a porous surface structure, and a method for producing such a fiber material. This fiber material can be used as a filter material, in particular as a cabin air filter, Recirculation filter, clean room filter, exhaust filter, housing filter and / or Vacuum cleaner filter, to be used.

One Problem in the processing of fiber materials, in particular made of polypropylene fibers, is their tendency to rupture. Especially with isotactic polypropylenes with high crystallinity this tendency is very pronounced. Such a brittle one Fiber breakage can result in loss of production in the production of fiber webs or prolonged set-up times. In the production of filters made of nonwovens this leads to brittle Tearing fibers to rupture the entire nonwoven structure, especially during the pleating process. At the torn Digits then occur during the filtering process to the dust. It is therefore desirable to have the fiber tear and / or a To avoid banding of the nonwoven structure.

From the prior art, a number of different methods for toughening of components, eg. As plastic screens or polypropylene films, known. In the case of polystyrene components z. B. elastomer particles in the micrometer range used to produce so-called. High-impact polystyrene (HIPS). In the case of sudden loading of these components, the elastomer particles cause the crack propagation to be suppressed, since many small cracks form from individual cracks, but these do not lead to component failure. In the case of polypropylene, similar strategies can be used. In this case, for example, inorganic fillers are used in conjunction with a phase mediator ( EP 1 589 070 A1 ).

A relatively new approach to polypropylene is toughening through the use of beta-nucleating agents ( S. Henning et al. Macromol. Symp., Vol. 214, pp. 157-171, 2004 ). The use of these beta-nucleating agents produces beta-spherulites in the polypropylene. Upon stressing of this modified material, the beta crystallites push against each other, forming microscopic pores ( Behrendt et al., J. Appl. Polym. Sci., Vol. 99, pp. 650-658, 2006 ). Pore formation absorbs the energy generated by the stress. This results in a tough fracture behavior, which leads to an irreversible deformation, but not to a brittle fracture. The tough fracture behavior is more advantageous than the brittle separation fracture, since the brittle fracture usually leads to complete and instantaneous component failure.

The effect of toughening of polypropylene or the formation of micropores by beta-nucleation has been demonstrated in films ( EP 0 865 910 A1 ) already described. The beta-modified polypropylene materials, unlike the unmodified polypropylene, exhibit significantly higher extensibilities, resulting in greater damage tolerance in impact and / or tensile stress.

In Regarding the modification of fiber webs and / or nonwovens so far only the positive effect of nucleating agents without beta modification been described. Here are used as nucleating sorbitol derivatives, Sodium benzoate or various phosphates used, however do not cause beta-nucleation. The improved mechanical Properties come from a narrower crystallite size distribution, which is caused by the nucleating agent. The However, crystal modification exists in the above nucleating agents made of polypropylene fibers in the alpha crystal modification. The alpha modification is disadvantageous because this under a mechanical stress does not form micropores, but a brittle fracture (breaking fraction) leads.

task The present invention is a fiber material, in particular Fiber fabric, nonwoven, Fasergewirk and / or fiber fabric, with higher Provide extensibilities, resulting in a higher damage tolerance is provided with impact and / or tensile stress. Further It is an object of the present invention, a fiber material, in particular Fiber fabric, nonwoven, Fasergewirk and / or fiber fabric, preferably with a reduced brittle fracture behavior, ready for put.

Also it is an object of the present invention to provide a fibrous material in particular fiber fabric, fleece, Fasergewirk and / or fiber fabric, preferably with a higher separation efficiency, dust binding capacity and service life (loading time), to provide.

The The object is achieved by the provision of a fiber material, in particular Fiber fabric, nonwoven, Fasergewirk and / or fiber fabric, which porous Polypropylene fibers with beta crystal structure comprises dissolved.

at an embodiment of the invention Fiber material is the average pore diameter of the pores of Polypropylene fibers in a range of 0.05-1 μm, preferably 0.2 to 0.5 microns. In one embodiment the pores are on the surface of the fibers. at In another embodiment, the pores are in the fibers and the surface of the fibers. At the pores It can be irregular shaped and different big pores act. Preferably, the Pores on the surface of the fibers around open pores, the preferably not interconnected. Below middle Pore diameter is preferably the arithmetic average pore diameter to understand all the pores in the fibers.

Under "pores the polypropylene fibers "are preferably the pores in and / or on the polypropylene fibers, but not the gaps the fiber material according to the invention itself understand.

Preferably, the polypropylene fibers of the fibrous material according to the invention have an MFI (melt flow rate, melt flow rate) of from 20 to 800 g / 10 min, more preferably from 100 to 400 g / 10 min. The MFI is after DIN ISO 1133 measured.

It was surprisingly found that the inventive Fiber material higher when used as filter material Dust-binding capacities, improved separation performance, has improved service life and / or the loading times Extend (lifetime) compared to conventional filter materials. The filter material according to the invention settles slower too. This is due to the porous structure the polypropylene fibers in and / or on which the dust prefers stores and / or deposits. The enlarged by the pores Surface allows improved dust separation.

Further it was found that the inventive Fiber material no brittle fracture behavior, but a has tough fracture behavior. The tough fracture behavior The fiber material is only under an irreversible deformation the fibers. The fiber material is more stable and can filter better be processed without tearing.

The Fiber material according to the invention preferably shows an improved processability by a much lower Sensitivity to mechanical stresses, such as tensile, tensile and / or impact loads. Since mechanical stresses, such as tensile stresses, in the manufacture of fiber material filters can not be avoided, are within the meaning of the invention provided fiber materials of great advantage.

The Fiber material according to the invention preferably has a significantly higher maximum tensile strength and / or maximum tensile strain to polypropylene fiber materials that do not have a β-crystallite structure exhibit.

The maximum tensile force and / or the maximum tensile strain may, for example, after DIN EN ISO 13934-1 be measured. Preferably, the fibers of the fiber material according to the invention have a maximum tensile force of at least 2.5 N, preferably from 2.8 to 10 N, most preferably from 3 to 5 N. By "maximum tensile force" is meant, in particular, the force needed to rupture a fiber of 100 μm in diameter.

at an embodiment, the inventive Fiber material toughened polypropylene fibers at room temperature (20-25 ° C) particularly high elongations of preferably up to 1000%, more preferably from 100 to 1000%, without tearing. The% specification preferably refers to the length of the Fiber after drawing based on the total length the fiber before drawing.

at an embodiment of the invention Fiber materials have from 1 to 95 wt .-%, preferably from 20 to 65 wt .-%, of the crystalline portions of the polypropylene, a beta-crystallite structure on. Preferably, 30 to 80 wt .-%, more preferably 40 to have 60 wt .-%, of the polypropylene in the inventive Fiber material, crystalline polypropylene, based on the total weight of polypropylene, on.

In one embodiment of the fiber material according to the invention comprises this polypropylene Fa which consist of polypropylene with or in the beta-crystallite structure.

at an embodiment of the invention Fiber material, the polypropylene fibers comprise at least one beta-nucleating agent.

Preferably is the beta-nucleating agent from the group consisting of bisamides, Dicarboxylic acids, color pigments and salts and mixtures thereof, selected.

Especially Calcium salts of dicarboxylic acids can be used become.

dicarboxylic acids and / or salts thereof may be selected from the group consisting of Pimelic acid, calcium pimelate, calcium phthalate, calcium terephthalate, Calcium suberate, calcium stearate, and / or mixtures thereof become.

The color pigments may be inorganic and / or organic color pigments. The organic color pigments (E3B from Clariant (formerly Hoechst) Hostaperm Red) include, for example, gamma quinacridone, for example, E3B ^®.

Bisamides containing coplanar phenyl rings can be used in the bisamide. It may be N, N-Dicyclohexylnaphthalin-2,6-dicarboxamide, which (New Japan Chemical Company, Tokyo) is available, for example under the trade name NU100 ^® can be used.

Preferably For example, the polypropylene fibers include a beta-nucleating agent in a concentration of at least 10 ppm, more preferably 50 ppm to 100,000 ppm, more preferably 100 ppm to 10,000 ppm, even further preferably 200 to 1000 ppm, based on the total weight of the polypropylene fibers.

at a preferred embodiment of the invention Fiber material is called beta-nucleating agent γ-quinacridone in concentrations of 10 to 10,000 ppm, preferably between 50 and 1000 ppm used.

at a further preferred embodiment of the invention Fiber material is used as beta-nucleating agent calcium pimelate, Calcium phthalate, calcium terephthalate, calcium suberate or calcium stearate, in concentrations of 10 to 100,000 ppm, preferably between 100 and 10000 ppm used.

at a further preferred embodiment of the invention As a beta-nucleating agent, fiber material is N, N-dicyclohexylnaphthalene-2,6-dicarboxamide in concentrations of 10 to 100,000 ppm, preferably between 100 and 10,000 ppm when used.

at an embodiment of the invention Fiber material comprises this polypropylene fibers with or in the Beta-crystallite structure containing isotactic polypropylene.

at an embodiment of the invention Fiber material, the polypropylene fibers have a mean fiber diameter from 1 μm to 500 μm, preferably 5 μm to 50 microns and / or an average fiber length of 1 cm to 1 m, preferably from 5 cm to 50 cm, on.

at an embodiment of the invention Fiber materials have the polypropylene fibers by uniaxial stretching a porous surface on. Preferably the polypropylene fibers to 2 to 10 times, more preferably on 2 to 4 times, stretched.

Preferably have the polypropylene fibers in the inventive Fiber material essentially no, preferably none, punctual Welds on. It turned out that due to the rough surface structure the polypropylene fibers snag. Therefore, no welding of the fibers is necessary. This is a big advantage because of the manufacturing process considerably simplified. Furthermore, the flow resistance the filter is preferably lower, since the Verschwungsungspunke in conventional filters in terms of filtering effect are not effective.

In one embodiment, the fiber material according to the invention has a weight per unit area of 50 to 500 g / m ² , preferably of 100 to 150 g / m ² .

In one embodiment of the fiber material according to the invention, the beta-crystallite structure achieved by a targeted cooling of polypropylene melts.

The Fiber material according to the invention, in particular the Fiber fabric, nonwoven, Fasergewirk and / or fiber fabric, can as a filter be designed.

Especially can the polypropylene fiber material in cabin air filters, recirculation filters, Clean room filters, exhaust air filters, domestic filters and / or vacuum cleaner filters, be used.

• a) Aufschmelzen von Polypropylen,
• b) Zumischen mindestens eines Beta-Nukleierungsmittels,
• c) Verspinnen der in Schritt b) bereitgestellten Mischung zu Polypropylen-Fasern, und
• d) Ablegen der Fasern
• d1) zu einem Fasermaterial oder
• d2) auf einer Aufnahmevorrichtung,

wobei die Fasern in Schritt c) und/oder Schritt d) verstreckt werden.The object is further achieved by a method for producing a fiber material, in particular fiber fabric, fleece, fiber knitted fabric and / or fiber fabric, comprising the following steps:

• a) melting of polypropylene,
• b) admixing at least one beta-nucleating agent,
• c) spinning the mixture provided in step b) into polypropylene fibers, and
• d) depositing the fibers
• d1) to a fiber material or
• d2) on a receiving device,

wherein the fibers are drawn in step c) and / or step d).

at an embodiment of the invention Process is in step a) the polypropylene at a temperature from a range of 180 ° C to 300 ° C, preferably 200 to 260 ° C, melted. Preferably, in step b) the beta-nucleating agents are mixed by extrusion. in this connection the same temperatures as in step a) can be used become. The extrusion can z. Eg with a laboratory extruder type 20x25 Collin company.

at an embodiment of the invention Process, the fibers are stretched uniaxially after spinning. Preferably, the polypropylene fibers become 2 to 10 times, more preferably stretched 2.5 to 4 times the length, they have immediately after the spinning in step c).

The Addition of the beta-nucleating agent causes the formation of a Beta-crystallite structure during cooling and before stretching the fiber strand. As a beta-nucleating agent can the substances described above, in particular in the concentrations described above.

According to one preferred variant of the method according to the invention After spinning, the fiber will be at a temperature within a range from 260 to 170 ° C, preferably to a temperature in a range of 155 to 90 ° C, cooled and then stretched.

at a preferred embodiment of the invention Procedure, the fibers through a spinning beam from the melt spun into fibers. The diameter of the nozzles in the spinning beam specifies the fiber diameter. These are preferably a fiber meltblown process.

at an embodiment of the invention Method the fibers are passed over a winder (galette) subtracted and / or stored on a conveyor belt and preferably withdrawn so continuously.

at an embodiment of the invention Process, the polypropylene to fibers with a mean diameter from 1 μm to 500 μm, preferably 5 μm to 50 microns, and / or a mean fiber length from 1 cm to 1 m, preferably from 5 cm to 50 cm, spun. Under the term average diameter of the fibers is preferably the to understand arithmetically averaged diameters relative to all fibers. The term average fiber length of the fibers is preferably the arithmetic fiber length relative to all fibers too understand.

at an embodiment of the invention Process are produced toughened fibers which at room temperature under thinning, d. H. under decrease of the fiber diameter, to stretch particularly well. Through the during The micropores formed by the stretching process appear to be the toughened ones and stretched fibers of the fiber material according to the invention Opaque when viewed with the naked eye.

In one embodiment of the method according to the invention, the fiber deposited in step d) becomes Material pleated to a filter.

Characters:

1 :

1 shows two scanning electron micrographs of a toughened PP fiber having a beta crystallite structure and a porous surface obtained by adding 0.1 wt% calcium pimelate beta nucleating agent and a fourfold fiber orientation. The porous surface structure with pores in the μm range, which results from the quadruple stretching of the fiber, is clearly visible.

1a shows a scanning micron micrograph on a scale of 100 microns with a 500 × magnification.

1b shows a scanning magnification micrograph on a scale of 1 mm with a 50 × magnification

By The following examples are intended to further illustrate the present invention explained, but in no way be limited.

Examples:

example 1

In polypropylene (PP) with an MFI (acc DIN ISO 1133 ) of 400 g / 10 min, 0.1% by weight of calcium pimelate, based on the total weight of the polypropylene, was incorporated by extrusion (die temperature 175 ° C.). The additive-containing PP thus obtained was spun with a spinning beam to form a nonwoven fabric by continuously pressing the additized PP through nozzles at a temperature of 230 ° C. and depositing it on a conveyor belt. As a result of the adhesion of the one fiber end to the moving conveyor belt, the fibers were stretched on average (on average) by a factor of four. The mean fiber diameter was 100 μm.

The scanning electron micrographs in 1 show a clearly porous surface structure of the fibers produced.

Example 2:

In a PP with an MFI of 400 g / 10 min (after DIN ISO 1133 ) were incorporated 50 ppm of γ-quinacridone, based on the total weight of polypropylene, by extrusion (die temperature 175 ° C). For adjusting this low dye concentration, a masterbatch with a concentration of 0.1% by weight of γ-quinacridone was used. The additive-containing PP thus obtained was spun with a spinning beam to form a nonwoven fabric by continuously pressing the additized PP through nozzles at a temperature of 230 ° C. and depositing it on a conveyor belt. Due to the adhesion of the one fiber end on the moving conveyor belt, the desired stretching of the fiber came about by a factor of 4. The mean fiber diameter was 100 μm.

Comparative Example 3

The Comparative Example 3 was carried out as described in Examples 1 and 2. However, no calcium pimelate or γ-quinacridone was added.

• (a) eines Polypropylen-Vlieses gemäß Beispiel 1, dessen Fasern mit 0,1 Gew.-% Calciumpimelat additiviert wurden,
• (b) eines PP-Vlieses gemäß Beispiel 2, dessen Fasern mit 50 ppm γ-Chinacridon additiviert wurden, und
• (c) eines PP-Vlieses gemäß Vergleichbeispiel 3 dessen Fasern nicht additiviert wurden.

Table 1 compares the maximum tensile strength and maximum tensile strain

• (a) a polypropylene nonwoven according to Example 1, the fibers of which were additized with 0.1% by weight calcium pimelate,
• (b) a PP nonwoven according to Example 2, whose fibers were additized with 50 ppm γ-quinacridone, and
• (c) a PP nonwoven according to Comparative Example 3 whose fibers were not additized.

The test was carried out after DIN EN ISO 139341-1 , For each fiber type, 10 tests were performed. The tensile forces and strains determined from the tests were arithmetically averaged. Table 1: mat type Maximum tensile strength [N] Maximum elongation [%] PP-reference; without additives (Comparative Example 3) 2.3 ± 0.2 816 ± 2.1 PP with 0.1% by weight calcium pimelate (Example 1) 3.6 ± 0.1 828 ± 8.3 PP with 50 ppm γ-quinacridone (Example 2) 3.2 ± 0.2 817 ± 0.8

table 1 clearly shows that the fibers of the additized nonwovens by the addition of 0.1% by weight of calcium pimelate or 50 ppm of γ-quinacridone the maximum tensile force at comparable strains around 50% higher than the fibers of the non-additivated Fleece.

Example 4

Nonwovens were prepared similarly as described in Examples 1 and 2 and Comparative Example 3. However, the fibers were stretched three times immediately after extrusion (die temperature 205 ° C). The mean fiber diameter of the extruded fibers was 15 μm. The fibers were continuously deposited into nonwovens, the nonwoven webs obtained had a basis weight of 120 g / m ² .

at The webs thus produced were the pressure drops, the Separation behavior, the load and the service life measured (cf. Tables 2/3).

Measurement of pressure drop and the separation behavior

For the measurements of the pressure drop and the deposition behavior round blanks (diameter 11.4 cm) were produced. The measurements were carried out on the basis of DIN 71460-1 , Each three round punched slivers (diameter 11.4 cm) of the respective type of fleece were measured on a flow channel (Welas ^® manufacturer: Palas) in terms of separation efficiency and pressure drop with NaCl particles. The pressure drop was determined at a flow pressure of 130 Pa.

Measurement of service life and loading

The service life and loading were determined on a larger flow channel with A2-AC Fine dust (standard dust) DIN 71460-1 on a filter with the following dimensions:
B × H × T = 331 × 175 × 30 mm; Inflow area: 0.0569 m ² ; Media area: 0.465 m ² ; Fold height: 28 mm; Fold distance: 7 mm.

Results

Pressure drop and separation efficiency

Of the Pressure drop refers to the difference in pressure of the fleece flowing through Gas before and after passing through the fleece.

The Separation efficiency refers to the percentage (% by weight) of a Particles deposited in the filter of a certain size class (eg 0.3-0.5 μm) based on the total amount the passed through the filter medium particles (100 wt .-%).

Of the Pressure drop was at a PP nonwoven with 0.1 wt .-% calcium pimelate 24 Pa at a pressure of 130 Pa on the upstream side. The separation efficiency for 0.3-0.5 μm large particles was 44% by weight.

Of the Pressure drop was 50 ppm γ-quinacridone for a PP nonwoven fabric 26 Pa at 130 Pa pressure on the inflow side. The separation efficiency for 0.3-0.5 μm particles was 48% by weight.

Of the Pressure drop was at a same produced PP nonwoven without Additive (reference) 17 Pa at 130 Pa pressure on the upstream side. The separation efficiency for 0.3-0.5 μm large particles was 25% by weight.

The increased separation efficiency correlates with an increasing pressure drop, which is due to the porous surface of the fibers in the flow-through nonwoven fabric. Table 2: mat type Pressure drop at 130 Pa inflow pressure in Pa Separation capacity for NaCl particles with an average particle diameter of 0.3-0.5 μm in% by weight PP-reference; without additives 17 Pa 25% PP with 0.1% by weight calcium pimelate 24 Pa 44% PP with 50 ppm γ-quinacridone 26 Pa 48%

table 2 clearly shows that by the addition of 0.1% by weight of calcium pimelate or 50 ppm γ-quinacridone the separation efficiency by almost 100% can be increased.

Loading time and dust binding capacity

Under Loading time is the period of time needed is used to make the filter by the deposition of A2-AC fine one to achieve predetermined pressure drop.

The Loading time, to which a pressure drop of 50 Pa is reached, was for a PP nonwoven with 0.1 wt .-% calcium pimelate 50 min. The loading time up to a pressure drop of 200 Pa was 74 minute

The Loading time, to which a pressure drop of 50 Pa is reached, was for a PP nonwoven with 50 ppm γ-quinacridone 44 min. The loading time up to a pressure drop of 200 Pa was 55 minute

The Loading time, to which a pressure drop of 50 Pa is reached, was 40 minutes for a reference PP nonwoven without additives. The loading time up to a pressure drop of 200 Pa was 50 min.

The dust-binding capacity is the amount of A2-AC fine which is deposited on the filter until a certain pressure drop is reached:
The dust binding capacity, which is achieved at a pressure drop of 50 Pa, was 12.51 g A2-AC fine for a PP nonwoven with 0.1% by weight calcium pimelate. The dust binding capacity at a pressure drop of 200 Pa was 22.19 g.

The Dust binding capacity, which at a pressure drop of 50 Pa was achieved in a PP nonwoven with 50 ppm γ-quinacridone 13.12 g A2-AC fine. The dust binding capacity at a pressure drop of 200 Pa was 21.66 g.

The Dust binding capacity, which at a pressure drop of 50 Pa was achieved, was in a reference PP nonwoven without additives 10.54 g A2-AC fine. The dust binding capacity at a pressure drop of 200 Pa was 20.33 g.

The measurement data of the loading times and dust-binding capacities are summarized in Table 3. Table 3: mat type Loading time in min Dust binding capacity in g PP-reference; without additives up to 50 Pa pressure drop (Comparative Example 3) 40 10.54 PP-reference; without additives up to 200 Pa pressure drop (Comparative Example 3) 50 20.33 PP with 0.1 wt .-% calcium pimelate to 50 Pa pressure drop (Example 1) 50 12.51 PP with 0.1 wt .-% calcium pimelate to 200 Pa pressure drop (Example 1) 74 22.91 PP with 50 ppm γ-quinacridone to 50 Pa pressure drop (Example 2) 44 13.12 PP with 50 ppm γ-quinacridone to 200 Pa pressure drop (Example 2) 55 21.66

Based Table 3 it can be seen that the inventive Nonwovens (with the additives calcium pimelate and γ-quinacridone) have significantly higher dust binding capacity and that the loading times (lifetimes) are extended. In other words: the invention Filters settle slower. This comes through the porous Surface structure, in and / or on which the dust preferably stored and / or stored. The enlarged by the pores Surface allows improved dust separation.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• EP 1589070 A1 [0003]
• EP 0865910 A1 [0005]

Cited non-patent literature

• - S. Henning et al. Macromol. Symp., Vol. 214, pp. 157-171, 2004 [0004]
• Behrendt et al., J. Appl. Polym. Sci., Vol. 99, pp. 650-658, 2006 [0004]
• - DIN ISO 1133 [0012]
• - DIN EN ISO 13934-1 [0017]
• - DIN ISO 1133 [0053]
• - DIN ISO 1133 [0055]
• - DIN EN ISO 139341-1 [0058]
• - DIN 71460-1 [0062]
• - DIN 71460-1 [0063]

Claims (20)

Fiber material, in particular nonwoven, fiber fabric, Fasergewirk, and / or fiber fabric, which is porous polypropylene fibers comprising beta-crystallite structure. The fibrous material of claim 1, wherein the middle one Pore diameter of the pores of the polypropylene fibers in one area of 0.05-1 μm. A fibrous material according to claim 1 or 2, wherein from 1 to 95 wt .-%, preferably from 20 and 65 wt .-%, of the crystalline Polypropylene polypropylene fibers, based on the total weight of the crystalline polypropylene, has a beta-crystallite structure. Fiber material according to one of the preceding claims, comprising polypropylene fibers made of polypropylene with or in consist of the beta-crystallite structure. Fiber material according to one of the preceding claims, wherein the polypropylene fibers are at least one beta-nucleating agent include. The fibrous material of claim 5, wherein the beta-nucleating agent from the group consisting of bisamides, dicarboxylic acids, organic color pigments and salts and / or mixtures thereof, is selected. The fibrous material of claim 6, wherein the dicarboxylic acid and / or their salts from the group consisting of pimelic acid, Calcium pimelate, calcium phthalate, calcium terephthalate, calcium suberate, Calcium stearate, and / or mixtures thereof is selected is. A fibrous material according to claim 6, wherein the organic Color pigments gamma-quinacridone include. The fibrous material of claim 6, wherein the bisamide N, N-dicyclohexylnaphthalene-2,6-dicarboxamide. Fiber material according to one of the claims 5-9 wherein the polypropylene fibers are the beta nucleating agent in a concentration of at least 10 ppm, based on the total weight the polypropylene fibers. Fiber material according to one of the preceding claims, wherein the polypropylene fibers comprise isotactic polypropylene. Fiber material according to one of the preceding claims, wherein the polypropylene fibers have a mean fiber diameter of 1 μm to 500 μm, preferably 5 μm to 50 microns, and / or a mean fiber length of 1 cm to 1 m, preferably from 5 cm to 50 cm. Fiber material according to one of the preceding claims, wherein the polypropylene fibers by uniaxial stretching a have porous surface. Fiber material according to one of the preceding claims, wherein the polypropylene fibers by uniaxial stretching a have porous surface and produced therefrom Filter a higher separation efficiency, a higher Service life and / or a higher dust load in comparison to filter, which does not have polypropylene fibers with a have porous surface. A filter comprising a fibrous material according to any one of Claims 1 to 14. Process for producing a fiber material, in particular nonwoven fiber fabric, fiber knitted fabric and / or fiber fabric, comprising the following steps: a) melting of polypropylene, b) Admixing at least one beta-nucleating agent, c) spinning the mixture provided in step b) to polypropylene fibers, and d) depositing the fibers d1) to a fiber material or d2) on a cradle, the fibers in step c) and / or step d) are stretched. The method of claim 16, wherein in step a) the polypropylene at a temperature in the range of 180 ° C is melted to 300 ° C. Process according to claim 16 or 17 for the preparation of polypropylene fibers, wherein in step b) the beta-nucleating agent is admixed by extrusion. Method according to one of claims 16 to 18, wherein the fibers are uniaxial, preferably 2 to 10 times, be stretched. Use of the fiber material according to one of the claims 1 to 14 for a cabin air filter, recirculation filter, clean room filter, Extract air filter, housing filter and / or vacuum cleaner filter.