DE102014214063A1 - Vulcanizate and vehicle tires and process for their preparation - Google Patents

Abstract

The invention relates to a vulcanizate and a vehicle tire having the vulcanizate in at least one component, in particular at least in the tread, and a method for producing the Vulkanisates and the vehicle tire. The vulcanizate of at least one first rubber mixture A contains particles of at least one further rubber mixture B, wherein the particles are anisotropic and oblong-shaped and have a shape factor F according to formula I) of greater than or equal to 3 F = average length / width.I) The preparation of the vulcanizate is carried out by a process which comprises the co-extrusion of a rubber mixture A and a rubber mixture B by a semi-hyperbolic converging extrusion stencil as process step.

Description

The invention relates to a vulcanizate and a vehicle tire having the vulcanizate in at least one component, in particular at least in the tread, and a method for producing the Vulkanisates and the vehicle tire.

In particular, the tread of vehicle tires is susceptible to cracking and crack propagation due to the dynamic stresses during driving. Even minor cracks can lead to major damage, such as block ruptures, when mechanical forces are applied by circulating the tire on the road, if the tread does not have sufficient resistance to crack propagation.

In the DE 2133150 there are disclosed rubber vulcanizates which are said to have a high resistance to crack growth under dynamic stress. For this purpose, the rubber mixtures of the vulcanizates in finely dispersed form contain particles of crosslinked or partially crosslinked elastomers.

The present invention is therefore based on the prior art based on the object to provide a vulcanizate in particular for vehicle tires, which is characterized by a further improvement in the tear propagation resistance under dynamic stress, with the result of the lowest possible crack propagation.

This object is achieved according to the invention in that the vulcanizate of at least one first rubber mixture A contains particles of at least one further rubber mixture B, wherein the particles are anisotropic and oblong-shaped and have a shape factor F according to formula I) greater than or equal to 3: F = average length / width. I)

The form factor F is thus the quotient of the average length of the particles and the width of the particles.

The lengths and widths of the particles are determined by methods known in the art, such as in particular by means of light microscopy.

It has been found that a vulcanizate containing elongated particles of the rubber composition B has a high resistance to crack propagation. In particular, with respect to vulcanizates containing spherical particles or anisotropic particles having a shape factor of less than 3 results in improved crack resistance and reduced crack propagation.

It is particularly advantageous in this case if the particles are aligned parallel to the extension direction of the vulcanizates. This gives e.g. when used in vehicle tires, preferably in the tread of vehicle tires, improved crack resistance under dynamic load and thus a longer durability of the tire. However, the vulcanizate according to the invention is also suitable for other technical rubber articles, such as e.g. Conveyor belts, belts, belts, hoses, blankets, air springs or damping elements suitable, in particular for those in which a high crack resistance due to the stresses plays an important role.

In the following, the invention will be explained in more detail by describing particularly advantageous features of the components forming the vulcanizates according to the invention.

The particles are elongated with a shape factor of greater than or equal to 3.

Preferably, the particles have a cigar-like shape. More preferably, the shape factor is 3 to 100.

The width (the longest diameter in the cross section perpendicular to the extension direction of the elongated particles) of the elongated particles is preferably 100 nm (100 nanometers) to 100 μm (100 micrometers), more preferably the range is between 1 μm and 20 μm.

With such a width and a shape factor F of greater than or equal to 3 of the particles, the vulcanizate has a particularly good tear propagation resistance and, due to the size of the particles, is particularly well suited for use in components of vehicle tires, preferably the tread.

The width means the longest diameter in the cross-section of the particles perpendicular to the direction of extent (and not the smallest width). The elongated particles may be tapered due to the production to both ends, so that the diameter at the ends continuously reduced.

The rubber mixture A contains at least one rubber. The at least one rubber is selected from the group consisting of natural polyisoprene and / or synthetic polyisoprene and / or butadiene rubber and / or solution-polymerized styrene-butadiene rubber and / or emulsion-polymerized styrene-butadiene rubber and / or liquid rubbers having a molecular weight Mw of greater than 20,000 g / mol and / or halobutyl rubber and / or polynorbornene and / or isoprene-isobutylene Copolymer and / or ethylene-propylene-diene rubber and / or nitrile rubber and / or chloroprene rubber and / or acrylate rubber and / or fluororubber and / or silicone rubber and / or polysulfide rubber and / or epichlorohydrin rubber and / or styrene-isoprene rubber Butadiene terpolymer and / or hydrogenated acrylonitrile-butadiene rubber and / or isoprene-butadiene copolymer and / or hydrogenated styrene-butadiene rubber.

In particular, nitrile rubber, hydrogenated acrylonitrile-butadiene rubber, chloroprene rubber, butyl rubber, halobutyl rubber or ethylene-propylene-diene rubber are used in the production of technical rubber articles such as straps, belts and hoses.

Preferably, the rubber of the rubber composition A is at least one diene rubber selected from the group consisting of synthetic polyisoprene and natural polyisoprene (NR) and styrene-butadiene rubber and polybutadiene (BR).

The rubber mixture B contains at least one rubber. The at least one rubber is selected from the group consisting of natural polyisoprene and / or synthetic polyisoprene and / or butadiene rubber and / or solution-polymerized styrene-butadiene rubber and / or emulsion-polymerized styrene-butadiene rubber and / or liquid rubbers having a molecular weight Mw of greater than 20,000 g / mol and / or halobutyl rubber and / or polynorbornene and / or isoprene-isobutylene copolymer and / or ethylene-propylene-diene rubber and / or nitrile rubber and / or chloroprene rubber and / or acrylate rubber and / or fluororubber and / or silicone rubber and / or polysulfide rubber and / or epichlorohydrin rubber and / or styrene-isoprene-butadiene terpolymer and / or hydrogenated acrylonitrile-butadiene rubber and / or isoprene-butadiene copolymer and / or hydrogenated styrene-butadiene rubber.

In particular, nitrile rubber, hydrogenated acrylonitrile-butadiene rubber, chloroprene rubber, butyl rubber, halobutyl rubber or ethylene-propylene-diene rubber are used in the production of technical rubber articles such as straps, belts and hoses.

Preferably, the rubber of the rubber composition B is at least one diene rubber selected from the group consisting of synthetic polyisoprene and natural polyisoprene (NR) and styrene-butadiene rubber and polybutadiene (BR).

In the case of the vulcanizate according to the invention, it is conceivable for the rubber mixtures A and B to comprise at least one identical rubber. But it is also conceivable that they contain one or more different rubbers.

The rubber composition B, which is contained in the vulcanizate in the form of anisotropic particles as described above, preferably contains 60 to 120 phr of at least one filler.

When two or more fillers are included, 60 to 120 phr means the total amount of all contained fillers, with zinc oxide not being included in the fillers in the present invention.

The filler may be of any type known to those skilled in the art, such as silica and / or carbon black, as well as other known polar and / or nonpolar fillers, such as aluminosilicates, chalk, starch, magnesia, titania or rubber gels. Furthermore, it is conceivable that the rubber mixture carbon nanotubes (CNT) including discrete CNTs, so-called hollow carbon fibers (HCF) and modified CNT containing one or more functional groups, such as hydroxyl, carboxyl and carbonyl groups).

Graphite and graphene as well as so-called "carbon-silica dual-phase filler" are conceivable as filler.

Particularly preferably, the rubber mixture B contains at least one carbon black and / or at least one silica.

The silicas may be the silicas known to those skilled in the art, which are particularly suitable as a filler for tire rubber mixtures.

However, it is particularly preferred if a finely divided, precipitated silica is used, which has a nitrogen surface (BET surface area) (according to DIN ISO 9277 and DIN 66132 ) from 35 to 350 m ² / g, preferably from 35 to 260 m ² / g, more preferably from 100 to 260 m ² / g and most preferably from 130 to 235 m ² / g, and a CTAB surface (according to ASTM D 3765 ) from 30 to 400 m ² / g, preferably from 30 to 250 m ² / g, particularly preferably from 100 to 250 m ² / g and very particularly preferably from 125 to 230 m ² / g. Such silicas lead z. B. in rubber mixtures for tire tread to particularly good physical properties of the vulcanizates. In addition, there may be advantages in the mixing processing by reducing the mixing time at constant product properties, resulting in a lead to improved productivity. As silicas can thus z. B. both those of the type Ultrasil ^® VN3 (trade name) from Evonik and highly dispersible silicas, so-called HD silicas (eg Zeosil ^® 1165 MP from Rhodia) are used.

If at least one silicic acid is present, it is preferred to use at least one coupling agent, in the form of silane or an organosilicon compound. Here, one or more different silane coupling agents can be used in combination with each other. The rubber mixture may thus contain a mixture of different silanes.

The silane coupling agents react with the superficial silanol groups of the silica or other polar groups during the mixing of the rubber or the rubber mixture (in situ) or even before the addition of the filler to the rubber in the sense of a pretreatment (pre-modification). All silane coupling agents known to the person skilled in the art for use in rubber mixtures can be used as silane coupling agents. Such known from the prior art coupling agents are bifunctional organosilanes having on the silicon atom at least one alkoxy, cycloalkoxy or phenoxy group as a leaving group and have as other functionality a group which may optionally undergo a chemical reaction with the double bonds of the polymer after cleavage , In the latter group may be z. For example, they may be the following chemical groups:
-SCN, -SH, -NH ₂ or -S _x - (where x = 2 to 8).

Thus, as silane coupling agents z. For example, 3-mercaptopropyltriethoxysilane, 3-thiocyanato-propyltrimethoxysilane or 3,3'-bis (triethoxysilylpropyl) polysulfides having 2 to 8 sulfur atoms, such as. For example, 3,3'-bis (triethoxysilylpropyl) tetrasulfide (TESPT), the corresponding disulfide (TESPD) or mixtures of the sulfides having 1 to 8 sulfur atoms with different contents of the various sulfides, are used. TESPT can, for example as a mixture with carbon black (trade name X50S ^® from Evonik) are added.

Preference is given to using a silane mixture which comprises 40 to 100% by weight of disulfides, particularly preferably 55 to 85% by weight of disulfides and very particularly preferably 60 to 80% by weight of disulfides.

Also blocked mercaptosilanes, as z. B. from the WO 99/09036 are known, can be used as a silane coupling agent. Also silanes, as in the WO 2008/083241 A1 , of the WO 2008/083242 A1 , of the WO 2008/083243 A1 and the WO 2008/083244 A1 can be used, can be used. Suitable for. B. silanes, which are sold under the name NXT in various variants by the company Momentive, USA, or those sold under the name VP Si 363 ^® by Evonik Industries.

The amount of coupling agent is preferably 0.1 to 20 phr, more preferably 1 to 15 phr.

Suitable carbon blacks are all types of carbon black known to those skilled in the art.

In one embodiment, the carbon black has an iodine number, according to ASTM D 1510 , which is also referred to as Jodadsorptionszahl, between 30 g / kg and 250 g / kg, preferably 30 to 180 g / kg, more preferably 40 to 180 g / kg, and most preferably 40 to 130 kg / g, and a DBP Number according to ASTM D2414 from 80 to 200 ml / 100 g, preferably 100 to 200 ml / 100g, more preferably 115 to 200 ml / 100g.

The DBP number according to ASTM D2414 determines the specific absorption volume of a carbon black or a light filler by means of dibutyl phthalate.

The rubber mixture B preferably contains comparatively little plasticizer, amounts of from 0 to 50 phr being preferred, and amounts of from 0 to 20 phr being particularly preferred.

These include all plasticizers known to those skilled in the art, such as aromatic, naphthenic or paraffinic mineral oil plasticizers, such as, for example, MES (mild extraction solvate) or TDAE (treated distillate aromatic extract), or rubber-to-liquid oils (RTL) or biomass-to-liquid. Oils (BTL) or Faktisse or plasticizer resins or liquid polymers (such as liquid BR), whose average molecular weight (determined by GPC = gel permeation chromatography, based on BS ISO 11344: 2004 ) is between 500 and 20,000 g / mol. If liquid polymers are used as plasticizers in the rubber mixture according to the invention, these are not included as rubber in the calculation of the composition of the polymer matrix.

When using mineral oil, this is preferably selected from the group consisting of DAE (Distilled Aromatic Extracts) and / or RAE (Residual Aromatic Extract) and / or TDAE (Treated Distilled Aromatic Extracts) and / or MES (Mild Extracted Solvents) and / or naphthenic oils.

The rubber mixture A preferably contains 10 to 55 phr of at least one filler, as listed above for the rubber mixture B. The rubber mixture A preferably contains at least one silica and / or at least one carbon black.

Furthermore, it is preferred if the rubber mixture A contains from 20 to 100 phr of at least one plasticizer, as listed above.

• a) Alterungsschutzmittel, wie z. B. N-Phenyl-N’-(1,3-dimethylbutyl)-p-phenylendiamin (6PPD), N,N‘-Diphenyl-p-phenylendiamin (DPPD), N,N‘-Ditolyl-p-phenylendiamin (DTPD), N-Isopropyl-N’-phenyl-p-phenylendiamin (IPPD), 2,2,4-Trimethyl-1,2-dihydrochinolin (TMQ),
• b) Aktivatoren, wie z. B. Zinkoxid und Fettsäuren (z. B. Stearinsäure),
• c) Wachse,
• d) Harze, insbesondere Klebharze,
• e) Mastikationshilfsmittel, wie z. B. 2,2’-Dibenzamidodiphenyldisulfid (DBD) und
• f) Verarbeitungshilfsmittel, wie z.B. Fettsäuresalze, wie z.B. Zinkseifen, und Fettsäureester und deren Derivate.

Furthermore, the rubber mixtures A and / or B may contain customary additives in customary parts by weight. These additives include

• a) anti-aging agents, such as. N-phenyl-N '- (1,3-dimethylbutyl) -p-phenylenediamine (6PPD), N, N'-diphenyl-p-phenylenediamine (DPPD), N, N'-ditolyl-p-phenylenediamine (DTPD ), N-isopropyl-N'-phenyl-p-phenylenediamine (IPPD), 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ),
• b) activators, such. Zinc oxide and fatty acids (eg stearic acid),
• c) waxes,
• d) resins, in particular adhesive resins,
• e) Mastikationshilfsmittel such. B. 2,2'-Dibenzamidodiphenyldisulfid (DBD) and
• f) processing aids, such as fatty acid salts, such as zinc soaps, and fatty acid esters and their derivatives.

The proportion of the total amount of further additives is 3 to 150 phr, preferably 3 to 100 phr and more preferably 5 to 80 phr.

In the total amount of other additives are still 0.1 to 10 phr, preferably 0.2 to 8 phr, more preferably 0.2 to 4 phr, zinc oxide (ZnO).

These may be any type of zinc oxide known to those skilled in the art, such as ZnO granules or powder. The conventionally used zinc oxide usually has a BET surface area of less than 10 m ² / g. However, it is also possible to use so-called nano-zinc oxide having a BET surface area of 10 to 60 m ² / g.

The vulcanization of the rubber mixture A and / or B is carried out according to a preferred embodiment of the invention in the presence of sulfur and / or sulfur donors by means of vulcanization accelerators, wherein some vulcanization accelerators can also act as sulfur donors. Sulfur or sulfur donors and one or more accelerators are added in the last mixing step in the stated amounts of the rubber mixture. The accelerator is selected from the group consisting of thiazole accelerators and / or mercapto accelerators and / or sulfenamide accelerators and / or thiocarbamate accelerators and / or thiuram accelerators and / or thiophosphate accelerators and / or thiourea accelerators and / or xanthate accelerators and / or guanidine accelerators.

Preferred is the use of a sulfenamide accelerator selected from the group consisting of N-cyclohexyl-2-benzothiazolesufenamide (CBS) and / or N, N-dicyclohexylbenzothiazole-2-sulfenamide (DCBS) and / or benzothiazyl-2-sulfenmorpholide (MBS ) and / or N-tert-butyl-2-benzothiazyl sulfenamide (TBBS).

Even more network-forming systems as they are for example available under the trade names Vulkuren ^{®, ®} or Duralink Perkalink ^®, or network-forming systems, as in the WO 2010/049261 A2 can be used in the rubber mixtures.

The constituents mentioned, such as rubber, filler and plasticizer, are contained in the unvulcanized rubber mixtures A and B, respectively, and they are also contained in the rubber mixtures A and B after vulcanization in the vulcanizate. It will be apparent to those skilled in the art that e.g. Diene rubbers chemically change by sulfur crosslinking. For the sake of simplicity, in the context of the present invention, "rubber mixture A" and "rubber mixture B" mean both the unvulcanized and the vulcanized rubber mixtures contained in the vulcanizate according to the invention, unless expressly stated otherwise.

According to a particularly advantageous embodiment of the invention, the rubber mixture B after vulcanization is stiffer than the rubber mixture A. Thus, the vulcanizates according to the invention preferably contain a comparatively soft rubber mixture A in which comparatively rigid anisotropic particles of the rubber mixture B are distributed. In such an advantageous embodiment, smaller cracks in the softer rubber composition A can very well be stopped on the stiffer (harder) particles of the rubber composition B so that a crack does not propagate through the vulcanizate.

The higher stiffness of the vulcanized rubber mixture B can be achieved by various measures. On the one hand, the rubber mixture B, with otherwise identical constituents, may contain less plasticizer and / or more filler than the rubber mixture A.

On the other hand, the rubber mixture B can be more strongly crosslinked, that is to say have a higher network density, than the rubber mixture A. This can be achieved in diene rubbers, for example, by a higher amount of sulfur and / or sulfur donors or other suitable known to the expert network formers in the rubber mixture B.

• a) Co-Extrusion einer Kautschukmischung A und einer Kautschukmischung B durch eine semihyperbolisch konvergierende Extrusionsschablone zur Bildung eines Extrudates, wobei die Kautschukmischung B in Form anisotroper Partikel mit einem Formfaktor F von größer oder gleich 3 in der Kautschukmischung A verteilt ist, und
• b) Vulkanisation des Extrudates.

According to a particularly preferred development of the invention, the vulcanizate is prepared from at least two mutually different rubber mixtures A and B by the following process:

• a) coextrusion of a rubber mixture A and a rubber mixture B through a semi-hyperbolic converging extrusion die to form an extrudate, wherein the rubber mixture B is distributed in the form of anisotropic particles having a shape factor F of greater than or equal to 3 in the rubber composition A, and
• b) vulcanization of the extrudate.

A vulcanizate produced by this process shows a particularly high resistance to crack propagation due to the orientation parallel to the extrusion direction of the anisotropic particles of the rubber mixture B.

This is exemplary in 1 shown. When the vulcanizate is a tread of a vehicle tire, the elongated particles are simultaneously aligned in the circumferential direction of the vehicle tire so that cracks can be optimally stopped under dynamic load.

In the extrusion of both rubber mixtures A and B by a semi-hyperbolic converging extrusion die, the particles of the rubber mixture B, which are present in the vulcanizate as crosslinked particles in the rubber matrix of the rubber mixture A, form. The formation of the elongated particles described above occurs inter alia by a different diligence behavior of the rubber mixtures A and B. The extrusion through a semi-hyperbolic converging extrusion stencil is inter alia in "Self-reinforcement of polymers as a consequence of elongational flow", Cermak et al, Rheol. Acta (2006), 45: 366-373 for polyethylene and polypropylene described.

For this preferred development of the invention, the characteristics of the rubber mixtures A and B or of the vulcanizate apply as described above.

According to an advantageous development of the invention, the rubber mixture B is at least partially precrosslinked in the above-described method prior to extrusion.

As a result of the precrosslinking of the rubber mixture B prior to extrusion through a semi-hyperbolic converging extrusion die, the rubber mixture B acquires a different flow behavior than the rubber mixture A, so that the anisotropic elongated particles with a shape factor of greater than or equal to 3 can form particularly well and align in parallel along the extrusion direction ,

Pre-crosslinking may be by any means known to those skilled in the art, e.g. by a sulfur vulcanization system and / or a peroxide crosslinking by means of heat and / or radiation and / or electron beam crosslinking.

Preferably, however, the rubber composition B is only slightly precrosslinked, specifically in such a way that a different dilution behavior is achieved, but the rubber mixture B can break during the extrusion through a semi-hyperbolic converging extrusion stencil, so that separate elongate particles form.

Another object of the present invention is to provide a vehicle tire having a higher resistance to crack damage, especially crack growth, to provide longer durability and increased safety, particularly during driving.

This object is achieved according to the invention in that the vehicle tire has at least one vulcanizate, as described above, in at least one component.

All abovementioned embodiments and developments for the vulcanizate and the rubber mixtures A and B contained therein apply here.

At least in the tread, the vehicle tire according to the invention preferably contains at least one vulcanizate according to the embodiments described above.

Such a vehicle tire exhibits improved resistance to crack damage, in particular, failures such as block tears in the tread due to crack propagation or propagation of a tear from the tread to the belt of the vehicle tire are avoided.

Furthermore, the present invention has the object to provide a method for producing a vehicle tire, whereby the vehicle tire by a higher resistance to crack damage, especially against crack growth, is characterized.

• a) Co-Extrusion einer Kautschukmischung A und einer Kautschukmischung B durch eine semihyperbolisch konvergierende Extrusionsschablone zur Bildung eines Extrudates, wobei die Kautschukmischung B in Form anisotroper Partikel mit einem Formfaktor F von größer oder gleich 3 in der Kautschukmischung A verteilt ist, und
• b) Formen des Extrudates zu wenigstens einem unvulkanisierten Bauteil eines Fahrzeugreifens und
• c) Vulkanisation eines Fahrzeugreifens, der wenigstens ein unvulkanisiertes Bauteil gemäß Verfahrensschritt b) enthält.

This object is achieved according to the invention in that the method for producing a vehicle tire contains at least the following method steps:

• a) coextrusion of a rubber mixture A and a rubber mixture B through a semi-hyperbolic converging extrusion die to form an extrudate, wherein the rubber mixture B is distributed in the form of anisotropic particles having a shape factor F of greater than or equal to 3 in the rubber composition A, and
• b) molding the extrudate to at least one unvulcanized component of a vehicle tire and
• c) vulcanization of a vehicle tire containing at least one unvulcanized component according to method step b).

A vehicle tire made by this method shows improved resistance to crack damage, particularly failures such as e.g. Block breaks in the tread due to crack propagation avoided. The component is therefore preferably at least the tread of the vehicle tire. All abovementioned embodiments and developments for the vulcanizate and the rubber mixtures A and B contained therein apply here.

A further object underlying the present invention is to provide a vehicle tire having a higher resistance to crack damage, in particular to crack growth, in order to ensure a longer durability and increased safety, in particular during driving.

The object is achieved by a vehicle tire, which was produced by the above method.

All abovementioned embodiments and developments for the vulcanizate and the rubber mixtures A and B contained therein apply here.

LIST OF REFERENCE NUMBERS

1

 Schematic exemplary section of a vulcanizate according to the invention

2

 Schematic representation of an elongate particle of the rubber mixture B with a shape factor F of greater than or equal to 3

3

Rubber mixture A, which surrounds the particles of the rubber mixture B.

4

Piece broken out of the vulcanizate after a crack on one of the elongated particles has stopped.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 2133150 [0003]
• WO 99/09036 [0034]
• WO 2008/083241 A1 [0034]
• WO 2008/083242 A1 [0034]
• WO 2008/083243 A1 [0034]
• WO 2008/083244 A1 [0034]
• WO 2010/049261 A2 [0050]

Cited non-patent literature

• DIN ISO 9277 [0029]
• DIN 66132 [0029]
• ASTM D 3765 [0029]
• ASTM D 1510 [0037]
• ASTM D2414 [0037]
• ASTM D 2414 [0038]
• ISO 11344: 2004 [0040]
• "Self-reinforcement of polymers as a consequence of elongational flow", Cermak et al, Rheol. Acta (2006), 45: 366-373 [0058]

Claims (11)

Vulcanizate of at least one first rubber mixture A, which contains particles of at least one further rubber mixture B, wherein the particles are anisotropic and oblong-shaped and have a shape factor F according to formula I) greater than or equal to 3: F = average length / width. I) Vulcanizate according to claim 1, characterized in that the particles have a width of 100 nm (nanometers) to 100 microns (microns). Vulcanizate according to one of claims 1 or 2, characterized in that the rubber mixture B contains 60 to 120 phr of at least one filler. Vulcanizate according to one of the preceding claims, characterized in that the rubber mixture B contains 0 to 50 phr of at least one plasticizer. Vulcanizate according to one of the preceding claims, characterized in that the rubber mixture A contains 10 to 55 phr of at least one filler and / or 20 to 100 phr of at least one plasticizer. A process for the preparation of a vulcanizate from at least two mutually different rubber mixtures A and B, characterized in that it comprises at least the following process steps: a) coextrusion of a rubber mixture A and a rubber mixture B by a semi-hyperbolic converging extrusion die to form an extrudate, wherein the rubber mixture B is distributed in the form of anisotropic particles having a shape factor F of greater than or equal to 3 in the rubber mixture A, and b) vulcanization of the extrudate. Vehicle tire, characterized in that it comprises at least one vulcanizate according to one of claims 1 to 5 in at least one component. Vehicle tire according to claim 7, characterized in that it comprises at least one vulcanizate according to one of claims 1 to 5 at least in the tread. A process for producing a vehicle tire, characterized in that it comprises the following process steps: a) coextrusion of a rubber mixture A and a rubber mixture B through a semi-hyperbolic converging extrusion die to form an extrudate, the rubber mixture B being in the form of anisotropic particles having a shape factor F of is greater than or equal to 3 distributed in the rubber composition A, and b) molding the extrudate to at least one unvulcanized component of a vehicle tire and c) vulcanization of a vehicle tire containing at least one unvulcanized component according to method step b). A method according to claim 9, characterized in that it is the component at least a tread of a vehicle tire. Vehicle tire according to one of claims 7 or 8, characterized in that it has been produced by a method according to claim 9 or 10.

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