Sulfur-crosslinkable rubber mixture, tread and vehicle tire

Abstract

The invention relates to a sulfur-crosslinkable rubber mixture, to a tread made thereof, and to a vehicle tire having at least one component which consists at least in part of a sulfur-crosslinked rubber mixture according to the invention, wherein the rubber mixture comprises an organosilicon-modified styrene-butadiene rubber, a silicic acid, and a liquid organosilicon-modified diene polymer.

Description

202401003 1 Description Sulfur-crosslinkable rubber compound, treads and vehicle tires The invention relates to a sulfur-crosslinkable rubber compound, a tread strip therefrom, and a vehicle tire comprising at least one component which consists at least partly of a sulfur-crosslinked rubber compound according to the invention, wherein the rubber compound comprises an organosilicon-modified styrene-butadiene rubber, a silica, and a liquid organosilicon-modified diene polymer. Since the driving characteristics of a tire, especially a pneumatic vehicle tire, depend to a large extent on the rubber composition of the tread, particularly high demands are placed on the composition of the tread compound. The partial or complete replacement of carbon black with silica in rubber compounds has generally improved driving characteristics in recent years. However, the well-known conflicts of objectives arising from opposing tire properties still exist even with silica-containing tread compounds. For example, an improvement in wet grip and dry braking performance usually results in a deterioration of rolling resistance, winter performance, and wear behavior. To resolve the conflicting objectives in the tread pattern, numerous approaches have already been pursued. For example, a wide variety of polymers, including modified ones, resins, plasticizers, and highly dispersed fillers have been used in rubber compounds, and attempts have been made to influence the vulcanizate properties by modifying the compound production process. Besides tires for passenger cars, tires optimized for heavy goods vehicles are playing an increasingly important role. Truck tires, in particular, often have high mileage, and ideally, their performance should not deteriorate significantly and continuously before reaching the end of their lifespan. Such tires therefore require long durability and high stability in their performance characteristics. Tread compounds specifically for truck tires are typically based on natural rubber in combination with butadiene rubber and / or solution-polymerized styrene-butadiene rubber. Carbon black, along with smaller amounts of silica, is primarily used as a reinforcing filler. 202401003 2 In use, these tires are characterized by very low rolling resistance, excellent abrasion resistance, and very favorable tear resistance compared to passenger car tires. A disadvantage, however, is their significantly poorer wet braking performance compared to passenger car tread compounds. It is known that the trade-off between rolling resistance and wet braking performance can be improved either by increasing the glass transition temperature (Tg) of the overall compound and / or by increasing the filler content, particularly with a corresponding increase in the silica content at the expense of carbon black. However, this typically leads to a deterioration in abrasion resistance, rolling resistance, and tear resistance—properties that are essential for truck tires. The prior art mentions various measures that attempt to resolve such and similar conflicts of objectives. WO 2023 / 104252 A1 concerns a sulfur-crosslinkable rubber compound comprising specific silanes and, by way of example, natural rubber and a styrene-butadiene rubber. EP 3 103 654 A1 relates to a sulfur-crosslinkable rubber compound comprising a liquid polybutadiene. WO 2009 / 147006 A1 relates to a rubber compound comprising a specific vulcanization system consisting of free sulfur, a sulfur donor and a silane. There is therefore a continuing interest in optimizing existing truck tires so that they retain their optimal properties even after a comparatively high mileage, in particular a consistently high level of resistance to cuts, punctures, and damage (so-called cut and chip behavior). Furthermore, there is a need for improved wet braking performance. The present invention is therefore based on the objective of providing a sulfur-crosslinkable rubber compound which, in a corresponding tire, in particular a truck or heavy-duty tire, exhibits significantly improved cut and chip behavior (i.e., improved robustness and resistance), wherein, in particular, rolling resistance, abrasion, tearing behavior and / or wet braking remain at a high level or are even further improved. This problem is solved by a sulfur-crosslinkable rubber compound according to the invention comprising (a) at least one polyisoprene rubber in a total quantity of 51 to 95 phr, Internal 202401003 3 (b) at least one styrene-butadiene rubber in a total quantity of 5 to 49 phr, (c) at least one silica with a BET surface area in a range of 225 to 400 m 2 / g in a total quantity of 30 to 95 phr; (d) at least one silane in a total amount of 1 to 20 pphf selected from the group consisting of blocked mercaptosilanes, unblocked mercaptosilanes and polysulfide silanes, wherein the styrene-butadiene rubber according to (b) is organosilicon-modified and each has a glass transition temperature Tg according to DSC in the range of -45 to -5°C, and the mixture further comprises (e) at least one liquid diene polymer which is organosilicon-modified and has a weight mean molecular weight Mw according to GPC in the range of 500 to 12000 g / mol and is present in a total amount in the range of 1 to 35 phr. Our own investigations have shown that the aforementioned combination, in particular (b), (c) and (e), results in a significant improvement in robustness and tire durability. This is particularly evident in a significantly improved cut and chip resistance over the tire's lifespan (see examples below). Furthermore, it was found that both wet braking performance and rolling resistance could be improved simultaneously. These two improvements are usually mutually exclusive, as they are subject to a typical conflict of objectives. The components of the sulfur-curable rubber compound according to the invention are described in more detail below. The following preferably applies, mutatis mutandis, to the tread strip and the vehicle tire according to the invention, as further defined below as preferred. The unit phr (parts per hundred parts of rubber by weight) used in the context of the present invention is the quantity commonly used in the rubber industry for compound formulations. The dosage of the parts by weight of the individual components is based in this document on 100 parts by weight of the total mass of all high-molecular-weight and therefore solid rubbers present in the mixture. The diene polymer (component (e)) contained in the invention, particularly preferably comprising polybutadiene, with a molecular weight of 500 to 12,000 g / mol, is therefore not included as rubber in the one hundred parts of the phr calculation. Internal 202401003 4 The term pph (parts per hundred parts of filler by weight), used in the context of the present invention, is the quantity commonly used in the rubber industry for coupling agents for interaction with fillers. In the context of this application, pph refers to the silica present as component (c), meaning that other fillers that may be present, such as carbon black, are not included in the calculation of the silane quantity. The weight-average molecular weight Mw of the liquid diene polymer (as well as all other polymers or rubbers) mentioned in the context of the present invention, as well as the number-average molecular weight (where reference is made to it), is determined by gel permeation chromatography (GPC with tetrahydrofuran (THF) as eluent at 40 °C, apparatus PPS, calibrated with polystyrene standard; size exclusion chromatography; SEC = size exclusion chromatography in accordance with BS ISO 11344:2004). The sulfur-curable rubber compound is now described in detail below: In principle, the sulfur-curable rubber mixture according to the invention is preferably a mixture that is essentially free of resins. In other words, no resins are intentionally added to the rubber mixture according to the invention. A rubber mixture according to the invention that does not contain any resin is particularly preferred. If resins are introduced as unavoidable impurities, these are generally tolerable, although not desirable. Preferably, the total amount of such resins in the rubber mixture according to the invention is 0 to 1 phr, more preferably 0 to 0.5 phr, and more preferably 0 to 0.1 phr. Furthermore, it is preferred that the rubber compound according to the invention is low in oils, preferably comprising no intentionally added oils at all. However, oils that may be present as unavoidable impurities or accompanying substances (e.g., in combination with sulfur) are generally tolerable and, in the context of the present invention, result in a rubber compound that is low in oils. Preferably, the total amount of oils in the rubber compound according to the invention is 0 to 3 phr, more preferably 0 to 2 phr, more preferably 0 to 1 phr, particularly preferably 0 to 0.5 phr, and most preferably 0 to 0.1 phr. A rubber compound according to the invention that is free of oil-enriched rubbers is therefore preferred. Internal 202401003 5 Accordingly, the rubber mixture according to the invention preferably comprises neither mineral nor non-mineral oils that are specifically added. Thus, the content of plasticizers that are not components according to (e) is preferably low; more preferably, component (e) is the only plasticizer in the rubber compound according to the invention. In the sense of the foregoing, this means that component (e) is preferably the only plasticizer deliberately and specifically added. The sulfur-curable rubber compound comprises (a) at least one polyisoprene rubber in a total amount of 51 to 95 phr and thus constitutes the predominant part of the rubbers in the rubber compound. The rubber compound according to the invention is therefore, in its basis, a polyisoprene-based rubber compound, preferably as described below. It is particularly suitable for truck or heavy-duty tires. A preferred rubber compound according to the invention comprises the at least one polyisoprene rubber according to (a) comprising at least one natural polyisoprene rubber (also known as natural rubber or natural rubber (NR)) and / or at least one synthetic polyisoprene rubber (IR), preferably at least one natural rubber (NR). Preferably, the at least one polyisoprene rubber according to (a) comprises exclusively one or more than one natural rubber (NR), particularly preferably as described below as preferred. Preferably, the at least one polyisoprene rubber according to (a) comprises at least one cis-1,4-polyisoprene rubber and / or at least one 3,4-polyisoprene rubber. This preferably applies regardless of whether the polyisoprene rubber is natural or synthetic. Preferably, at least one cis-1,4-polyisoprene rubber is present, with a cis-1,4 content particularly greater than 90 wt.%. Such a polyisoprene rubber is preferably obtained by stereospecific polymerization in solution with Ziegler-Natta catalysts or using finely divided lithium alkyls. Furthermore, natural rubber (NR) is typically also such a cis-1,4-polyisoprene rubber. Particularly preferred is at least one natural rubber (NR) comprising at least one cis-1,4-polyisoprene rubber, preferably with a cis-1,4 content greater than or equal to 99 wt.%. A preferred rubber compound according to the invention comprises at least one polyisoprene rubber according to (a) in a total amount of 60 to 92 phr, preferably 67 to 90 phr, and most preferably 73 to 85 phr. Internal 202401003 6 Increasingly improved tearing properties are the basis for the quantity ranges of the rubber compound. The at least one polyisoprene rubber according to (a) preferably has a weight-average molecular weight Mw according to GPC in the range of 250,000 to 5,000,000 g / mol. It therefore belongs to the high molecular weight rubbers that are included in the hundred parts when calculating the phr reference value. The sulfur-crosslinkable rubber mixture according to the invention further comprises (b) at least one styrene-butadiene rubber in a total quantity of 5 to 49 phr. This is a so-called SBR which constitutes the second largest rubber species in the total mixture by quantity. Preferably, the at least one styrene-butadiene rubber according to (b) comprises at least one solution-polymerized styrene-butadiene rubber (SSBR) and / or (preferably or) at least one emulsion-polymerized styrene-butadiene rubber (ESBR); preferably at least one solution-polymerized styrene-butadiene rubber (SSBR); particularly preferably exclusively one or more than one solution-polymerized styrene-butadiene rubber (SSBR). The terms “styrene-butadiene rubber” and “styrene-butadiene copolymer” are synonymous in the context of the present invention. Particularly preferably, the at least one styrene-butadiene rubber according to (b) has a weight-average molecular weight Mw according to GPC in the range of 250,000 to 600,000 g / mol. This rubber is also taken into account in the calculation of the phr quantities. A rubber compound according to the invention is preferred, wherein the at least one styrene-butadiene rubber according to (b) is present in a total amount of 8 to 40 phr, preferably 10 to 33 phr, most preferably 15 to 27 phr. The at least one styrene-butadiene rubber present in the context of the present invention according to (b) each has a glass transition temperature Tg according to DSC in a range of -45 to -5°C. These ranges are therefore the individual glass transition temperatures of the individual styrene-butadiene rubbers, provided that more than one styrene-butadiene rubber is present. This is not a mean or average glass transition temperature. However, such a mean or average glass transition temperature necessarily results from the average of the individual glass transition temperatures. It is of course known to those skilled in the art how a mean or average glass transition temperature of several styrene- Internal 202401003 7 butadiene rubbers are determined. Particularly preferably, the at least one styrene-butadiene rubber according to (b) comprises only a single styrene-butadiene rubber. In the context of the present invention, the glass transition temperature Tg is determined by means of DSC, preferably according to ISO 22768 (2020 E), unless the manufacturer of commercially available styrene-butadiene rubbers already specifies a glass transition temperature. A rubber compound according to the invention is preferred, wherein the at least one styrene-butadiene rubber according to (b) has a respective glass transition temperature Tg in the range of -40 to -8°C, preferably from -36 to -11°C, more preferably from -32 to -14°C, most preferably from -28 to -17°C. The at least one styrene-butadiene rubber according to (b) in the context of the present invention is organosilicon-modified, preferably at least along the polymer chain and / or at least terminally organosilicon-modified. A rubber compound according to the invention is particularly preferred, wherein the at least one styrene-butadiene rubber according to (b) is at least terminally organosilicon-modified, and most preferably exclusively terminally organosilicon-modified with respect to its functionalization. Preferably, the organosilicon modification comprises one or more SiOR groups, wherein R independently represents hydrogen or an organic residue, preferably an organic residue. Furthermore, the one or more SiOR groups are either directly linked to the at least one styrene-butadiene rubber according to (b) or coupled via a spacer, the spacer preferably being organic. Preferably, the organic residue R independently comprises an alkyl group, a heteroalkyl group, and / or a cycloalkyl group. Preferably, the organic residue R comprises 1 to 12 carbon atoms, more preferably 1 to 8 carbon atoms, more preferably 1 to 6 carbon atoms, and particularly preferably 1 to 4 carbon atoms. A preferred alkyl group and cycloalkyl group comprises a C1 to C12 alkyl group or a C3 to C12 cycloalkyl group, respectively, and more preferably a C1 to C6 alkyl group or a C3 to C6 cycloalkyl group.R most preferably comprises a C1 to C3 alkyl group, in particular preferably methyl and / or ethyl. If the SiOR function is coupled via a spacer, the spacer is or preferably comprises an alkylene residue, preferably a C3 to C12 alkylene residue. The organosilicon modification described above as a functionalization of the at least one styrene-butadiene rubber is preferably not the only one. Internal 202401003 8 Functionalization. A rubber compound according to the invention is preferred, wherein the at least one styrene-butadiene rubber according to (b) is not only organosilicon-modified, but is additionally modified, i.e., by means of a modification different from the organosilicon modification. This additional modification is preferably selected from the group of functional groups consisting of hydroxy, epoxy, and mercapto. Particularly preferably, the organosilicon modification and optionally also the additional modification cause a chemical interaction with the at least one silica according to component (c) of the rubber mixture according to the invention. The sulfur-crosslinkable rubber compound according to the invention further comprises (c) at least one silica with a BET surface area in a range of 225 to 400 m². 2 / g in a total quantity of 30 to 95 phr. In the context of the present invention, the terms “silica” and “silicic acid” are synonymous. A rubber mixture according to the invention is preferred, wherein the silica according to (c) is present in a total amount of 33 to 90 phr, preferably from 36 to 85 phr, more preferably from 39 to 80 phr, particularly preferably from 42 to 75, most preferably from 45 to 70 phr. A rubber compound according to the invention is preferred, wherein the silica according to (c) provides a BET surface area in the range of 230 to 380 m². 2 / g, preferably from 230 to 360 m 2 / g, further preferably from 235 to 340 m 2 / g, especially preferably from 240 to 310 m 2 / g, preferably from 255 to 295 m 2 / G. A comparatively high BET surface area is essential to the invention. Preferably, this is at least one finely dispersed, precipitated silica. Our own investigations have shown that such silicas achieve a significantly better distribution within the rubber compound according to the invention. This has a very positive effect on the stiffness and abrasion resistance of the overall compound, and particularly on a sulfur-crosslinked rubber compound, without simultaneously experiencing a significant loss of quality with regard to tear resistance and wet braking performance. This improved balance becomes apparent when the at least one silica according to (c) is present in a total quantity in the range of 30 to 95 phr; however, it is further improved when the total quantity is in the aforementioned preferred ranges. Internal 202401003 9 In principle, the rubber compound according to (d) comprises at least one silane in a total amount of 1 to 20 pph. The sulfur-curable rubber compound according to the invention particularly comprises (d) at least one silane in a total amount of 1 to 20 pph selected from the group consisting of blocked mercaptosilanes, unblocked mercaptosilanes, and polysulfide silanes. In the context of the present invention, the term "polysulfide" already includes S₂ silanes, i.e., disulfides or disulfide silanes. A rubber compound according to the invention is preferred, wherein the at least one silane according to (d) is present in a total amount of 5 to 17 phr, preferably 7 to 14 phr. Preferably, the polysulfide silanes comprise S2, S3, S4, S5, S6, and / or S8. Particularly preferably, the polysulfide silanes comprise 3,3'-bis(triethoxysilylpropyl)disulfide (TESPD) and / or 3,3'-bis(triethoxysilylpropyl)tetrasulfide (TESPT). In some cases, a rubber compound according to the invention is preferred, wherein it either contains no polysulfide silanes or contains one or more than one polysulfide silane in combination with a blocked and / or unblocked mercaptosilane. Preferably, the rubber mixture according to the invention does not comprise alkyltriethoxysilanes (e.g., octyltriethoxysilane, e.g., available under the trade name "Si208" from Evonik). These are typically not capable of chemical interaction with a polymer or rubber because they do not contain sulfur. Therefore, the rubber mixture according to the invention particularly preferably does not comprise sulfur-free silanes. Preferably, the rubber mixture according to the invention comprises one or more than one sulfur-free silane (if one is to be included) in combination with at least one sulfur-containing silane, preferably in combination with at least one silane as defined for (d), and particularly preferably in combination with a blocked and / or unblocked mercaptosilane. A rubber compound according to the invention is particularly preferred, wherein the at least one silane according to (d) is selected from the group consisting of blocked mercaptosilanes and unblocked mercaptosilanes, preferably blocked mercaptosilanes. Unblocked mercaptosilanes are silanes that possess an -SH group, meaning a hydrogen atom directly bonded to the sulfur atom. Blocked mercaptosilanes are silanes that possess an S-SG group, where "SG" stands for protecting group on the sulfur atom "S". Preferred protecting groups include, for example, acyl groups. Internal 202401003 10 The expression “selected from the group consisting of blocked mercaptosilanes and unblocked mercaptosilanes” includes, among other things, that either only blocked or only unblocked silanes or a mixture (of one or more) of blocked and unblocked silanes is present in the rubber compound according to the invention. It is of course clear to those skilled in the art that this naming refers to the initial state of the components of the sulfur-crosslinkable rubber mixture according to the invention, but that during the mixing process and / or vulcanization the protecting groups are cleaved off and the respective sulfur atoms subsequently react chemically. A preferred rubber compound according to the invention is one in which the blocked or unblocked (preferably the blocked) mercaptosilanes either have a single sulfur atom or have two or more than two sulfur atoms. In the case of two or more than two sulfur atoms, the sulfur atoms are not directly adjacent, but are separated from each other by spacer groups (preferably alkylene groups). A preferred blocked mercaptosilane with a single sulfur atom comprises, preferably, 3-octanoylthio-1-propyltriethoxysilane having the formula V) (EtO)3Si-(CH2)3-S- C(=O)-(CH2)6-CH3, for example available as a commercial product under the name NXT-Silane from the company Momentive. A rubber compound according to the invention is preferred, wherein the blocked or the unblocked mercaptosilane has the general molecular formula IV): (R 4 )3Si-(ZS) r R 5 IV), whereby R4 independent alkoxy groups with 1 to 10 carbon atoms; R 5 an acyl group with 1 to 20 carbon atoms (results in a blocked mercaptosilane) or a hydrogen atom (results in an unblocked mercaptosilane), preferably an acetyl group; Z (independently of other Z in the molecular formula IV) represents an alkylene group with 1 to 10 carbon atoms, preferably with 2 to 8 carbon atoms, particularly preferably with 3 to 6 carbon atoms; and Internal 202401003 11 r means an integer from the range of 1 to 5, preferably 2 to 3, most preferably r means 2. S is the abbreviation for sulfur and Si for silicon. Blocked mercaptosilanes have a protecting group on the sulfur atom, in the present case (formula IV) the group R. 5 , which is why they are also called "protected mercaptosilans". A preferred block mercaptosilane with two sulfur atoms comprises, preferably, a silane of formula IV-a) (R 4 )3Si-(Z1-S)-(Z2-S)-R 5 IV-a), wherein R 4 independent alkoxy groups with 1 to 3 carbon atoms means, preferably ethoxy, particularly preferably all ethoxys; R 5 an acyl group with 1 to 10 carbon atoms, preferably an acetyl group; Z1 means an alkylene group with 2 to 6 carbon atoms, preferably with 2 to 5 carbon atoms, particularly preferably with 3 to 4 carbon atoms; and Z2 means an alkylene group with 2 to 8 carbon atoms, preferably with 3 to 7 carbon atoms, particularly preferably with 4 to 6 carbon atoms. Particularly preferably, the compound of formula IV-a) comprises a compound of formula IV-b) (chemical name: 4-7-acetyl-7-thiaheptyl-4-thiabutyl-triethoxysilane) (EtO)3Si-(CH2)3-S-(CH2)6-SC(=O)-CH3 IV-b). It is particularly preferred that the rubber compound according to the invention comprises at least one block-formed mercaptosilane, preferably of formula IV-a and / or formula V, and particularly preferably of formula IV-b and / or formula V. It is particularly preferred that these are the only mercaptosilanes in the rubber compound according to the invention, and particularly preferably the only silane compounds at all. The sulfur-crosslinkable rubber mixture according to the invention further comprises (e) at least one liquid diene polymer which is organosilicon-modified and has a weight-average molecular weight Mw according to GPC in a range of 500 to 12000 g / mol and is present in a total amount in a range of 1 to 35 phr. Internal 202401003 12 In the context of the present invention, the weight-average molecular weight range Mw specified here means that the diene polymer is liquid at room temperature. For the sake of simplicity, the short term "liquid diene polymer" is therefore also used within the scope of the present invention. The specified Mw refers to the diene polymer including the organosilicon modification. Diene polymers are typically polymers produced by polymerization or copolymerization of dienes and / or cycloalkenes, which have C=C double bonds either in the main chain or in the side groups. Liquid polymers typically offer excellent processability due to their comparatively low viscosity. In the context of the present invention, the at least one diene polymer according to (e) preferably acts as a plasticizer. A preferred rubber mixture according to the invention is one in which the at least one liquid diene polymer according to (e) has a weight-average molecular weight Mw according to GPC in a range of 1000 to 11000 g / mol, preferably from 2000 to 10000 g / mol, particularly preferably from 4000 to 9000 g / mol. A preferred rubber mixture according to the invention is one in which at least one liquid diene polymer according to (e) is present in a total amount in the range of 1.5 to 30 phr, preferably from 2 to 25 phr, more preferably from 2.5 to 20 phr, most preferably from 3 to 15 phr. A rubber mixture according to the invention is particularly preferred, wherein the at least one liquid diene polymer according to (e) is at least terminally organosilicon-modified, preferably exclusively at least terminally organosilicon-modified with respect to its modifications. With regard to the glass transition temperature, the at least one organosilicon-modified liquid diene polymer according to (e) is not necessarily restricted. A rubber compound according to the invention is particularly preferred, wherein the at least one organosilicon-modified liquid diene polymer according to (e) has a glass transition temperature Tg according to DSC (Mettler Toledo apparatus; measurement from +70 °C to -150 °C, temperature change of 10 K / min) in a range of -85 to -30 °C, preferably from -75 to -40 °C, and particularly preferably from -65 to -45 °C. A rubber compound according to the invention is particularly preferred, wherein the at least one organosilicon-modified liquid diene polymer according to (e) is combined with at least one residue according to formula I) I) (R1 R2R3)Si- Internal 202401003 13 is modified, whereby - R1, R2, R3 are independently selected from linear or branched alkoxy, cycloalkoxy, alkyl, cycloalkyl or aryl groups, each comprising 1 to 20 carbon atoms; and - the remainder according to formula I) is directly or via a bridge to the polymer chain of the diene polymer, the bridge being based on a divalent, saturated or unsaturated hydrocarbon, optionally containing cyclic, aliphatic and / or aromatic groups, and optionally heteroatoms in or on the hydrocarbon Our own investigations suggest that such a modification has very positive effects on rolling resistance. Furthermore, in combination with an organosilicon-modified styrene-butadiene rubber as defined in the context of the present invention, it shows surprising improvements with regard to the durability of tire components (see examples at the end of the text). Preferably, R1, R2, R3 are alkoxy groups. Particularly preferably, at least one of the three groups R1, R2, R3 is an ethoxy group. Most preferably, all three groups R1, R2, R3 are each an ethoxy group (abbreviated as OEt). This preferably applies to all embodiments of the invention mentioned above, including formulas II) and III) below. In some cases, a sulfur-crosslinkable rubber compound according to the invention is preferred, wherein the remainder according to formula I) is not directly connected, but via the bridge YX, resulting in formula II): II) (R1R2R3)Si-YX-, where R1 R2R3 has the meaning as in Formula I); Y has the meaning of -(CH2)n- and n is an integer from the range of 1 to 8 (i.e., signifies an alkylene residue), preferably n is an integer in the range of 2 to 4; and X is a functional group selected from the group consisting of ester, ether, urethane, urea, amine, amide, thioether and thioester. In the context of the present invention, urethane means an -N(H)-C(O)-O- group which preferably bonds to the “Y” with the nitrogen “N”. Internal 202401003 14 Particularly preferred is a rubber mixture according to the invention, wherein the at least one organosilicon-modified liquid diene polymer according to (e) is modified with a residue according to formula II), wherein in Y n = 3 (i.e., represents a divalent propylene residue) and X is urethane (-N(H)-C(O)-O-) and the residues R1 , R2 and R3 are all an ethoxy group (OEt). Particularly preferred is a rubber compound according to the invention, wherein the at least one organosilicon-modified liquid diene polymer according to (e) comprises a polybutadiene (abbreviated PB) and preferably has an overall structure according to formula III): Preferably, the at least one organosilicon-modified liquid diene polymer according to (e) comprises exclusively one or more than one organosilicon-modified liquid polybutadiene. Here, PB means "polybutadiene". Particularly preferably, everything said generally for the organosilicon-modified liquid diene polymer applies mutatis mutandis to the particularly preferred polybutadiene. A rubber compound according to the invention is particularly preferred, wherein the at least one organosilicon-modified liquid diene polymer according to (e) has a vinyl content (content of 1,2-bonded butadiene, based on the monomers of the polymer chain of the diene polymer) of 40 to 75%, particularly preferably of 50 to 75%, and most preferably of 55 to 70%. A rubber compound according to the invention is particularly preferred, wherein the at least one organosilicon-modified liquid diene polymer according to (e) has a 1,4-trans content of 5 to 30% (based on the monomers of the polymer chain of the polybutadiene), particularly preferably 10 to 25%. A rubber compound according to the invention is particularly preferred, wherein the at least one organosilicon-modified liquid diene polymer according to (e) has a cis content in a range of 5 to 30% (based on the monomers of the polymer chain of the polybutadiene), particularly preferably 10 to 25%. The microstructural features, such as 1,4-trans content, vinyl content, and cis content, are typically determined after the synthesis of liquid polybutadiene using [methods / methods]. 13 C-NMR (90.5628 MHz; relaxation agent Cr(acac)3; solvent CDCI3, Bruker 360 MHz) determined. Internal 202401003 15 The at least one organosilicon-modified liquid diene polymer according to (e), in particular comprising polybutadiene, is preferably prepared by reaction of 3-isocyanate-n-propyl triethoxysilane with terminally hydroxy-functionalized polybutadiene (e.g. Krasol LBH-P3000) as described in US 2002 / 0082333 A1. The sulfur-crosslinkable rubber compound according to the invention preferably further comprises (f) at least one carbon black, preferably in a total quantity in the range of 0.1 to 25 phr, more preferably from 0.5 to 20 phr, more preferably from 1 to 15 phr, more preferably from 1.5 to 10 phr, most preferably from 2 to 8 phr. In principle, the rubber compound according to the invention is not specifically restricted with regard to the carbon black. A rubber compound according to the invention is particularly preferred in which the at least one carbon black according to (f) has an iodine adsorption value according to ASTM D 1510 in the range of 30 to 180 g / kg, preferably from 30 to 130 kg / g, and / or a DBP value according to ASTM D 2414 in the range of 80 to 200 ml / 100 g, preferably from 100 to 200 ml / 100 g, particularly preferably from 100 to 180 ml / 100 g. Typically, this results in particularly good rolling resistance indicators (rebound elasticity at 70 °C) for use in vehicle tires, while maintaining good other tire properties. In some cases, a rubber mixture according to the invention is preferred, wherein the rubber mixture comprises, in addition to the components (c) and optionally (f), one or more than one further polar and / or non-polar filler, preferably selected from the group consisting of aluminosilicates, chalk, starch, magnesium oxide, titanium dioxide and rubber gels. Zinc oxide is not one of the fillers in the present invention. The vulcanization (also called crosslinking or sulfur crosslinking) of the rubber compound according to the invention preferably takes place in the presence of sulfur and / or sulfur donors, preferably with the assistance of vulcanization accelerators, wherein some vulcanization accelerators are preferably also sulfur donors. The added or released sulfur is typically activated for vulcanization by complex formation. In the context of the present invention, the terms sulfur donor, sulfur-donating compound, and sulfur donor are synonymous. Internal 202401003 16 The sulfur-crosslinkable rubber compound according to the invention therefore preferably additionally comprises (g) Sulfur and / or at least one sulfur donor, wherein the sulfur donor is preferably selected from the group consisting of thiuram disulfides and thiophosphates, and / or (preferably and) (h) at least one (i.e. one, two, three or more than three) vulcanization accelerator (preferably in addition to or as an alternative to (g), particularly preferably in addition to), preferably one (or more than one) sulfenamide accelerator. As already explained, in some preferred cases, component (h) preferably also fulfills the function of component (g). This preferably results in the rubber compound according to the invention not comprising any conventional sulfur and / or a conventional sulfur donor. Particularly preferred is a sulfur-crosslinkable rubber mixture according to the invention, wherein the sulfur or the at least one sulfur donor according to (g) is present in a total amount in the range of 0.1 to 3 phr, preferably from 0.5 to 1.8 phr, more preferably from 1 to 1.6 phr. There are no particular restrictions regarding the sulfur donors, so that in principle all sulfur donors known to those skilled in the art are suitable, as long as they provide sulfur in a suitable form under the given conditions. Any sulfur-donating substance known to those skilled in the art can be used as the sulfur-donating substance. A rubber mixture according to the invention is preferred, wherein the at least one sulfur donor is selected from the group consisting of sulfides (preferably disulfides and / or polysulfides), dithioalkanes, and phosphates (preferably thiophosphates). Particularly preferred sulfides include thiuram disulfides and / or thiuram tetrasulfides. A rubber mixture according to the invention is particularly preferred, wherein the at least one sulfur donor is selected from the group consisting of thiuram disulfides, thiuram tetrasulfides and dithiophosphates. A rubber compound according to the invention is particularly preferred, wherein the at least one sulfur donor is selected from the group consisting of tetrabenzylthiuram disulfide (TBzTD), tetramethylthiuram disulfide (TMTD), tetraethylthiuram disulfide (TETD), dipentamethylenethiuram tetrasulfide (DPTT), bis-(diisopropyl)thiophosphoryl disulfide (DipDis), bis(O,O-2-ethylhexyl thiophosphoryl) polysulfide (e.g., available as Internal 202401003 17 Rhenocure SDT 50®, Rheinchemie GmbH), zinc dichloroyl dithiophosphate (e.g. available as Rhenocure ZDT / S®, Rheinchemie GmbH), zinc alkyl dithiophosphates, 1,6-bis(N,N-di-benzylthiocarbamoyldithio)hexane, diaryl polysulfides and dialkyl polysulfides. There are no particular restrictions regarding the vulcanization accelerators. Preferred vulcanization accelerators include thiazole accelerators, mercapto accelerators, sulfenamide accelerators, thiocarbamate accelerators, thiuram accelerators, thiophosphate accelerators, thiourea accelerators, xanthate accelerators, and / or guanidine accelerators. Particularly preferred is one or more than one sulfenamide accelerator and / or one or more than one guanidine accelerator, and especially one or more than one accelerator selected from the group consisting of N-cyclohexyl-2-benzothiazole sulfenamide (CBS), N,N-dicyclohexylbenzothiazole-2-sulfenamide (DCBS), benzothiazole-2-sulfene morpholide (MBS), N-tert-butyl-2-benzothiazole sulfenamide (TBBS), and diphenylguanidine (DPG). Particularly preferred is a sulfur-curable rubber compound according to the invention, wherein the at least one vulcanization accelerator according to (h) is present in a total amount in the range of 0.5 to 4 phr, preferably from 1 to 3 phr. A preferred rubber compound according to the invention, preferably as described above and / or below, comprises one or more than one vulcanization retarder. The presence of a vulcanization retarder contributes, for example, to a better balanced vulcanization process. A preferred sulfur-curable rubber compound according to the invention, preferably as described above and / or below, comprises one or more than one further additive. These are typically conventional additives in the typical quantities that are added during the production of the rubber compound, preferably in at least one basic mixing stage. Preferably, one or more than one further additive comprises: j) anti-aging agents known from the prior art, preferably comprising para-phenylenediamines and / or dihydroquinolines; particularly preferably selected from the group consisting of N-phenyl-N'-(1,3-dimethylbutyl)-p-phenylenediamine (6PPD), N,N'-diphenyl-p-phenylenediamine (DPPD), N-(1-phenylethyl)-N'-phenyl-p-phenylenediamine (SPPD), N,N'-ditolyl-p-phenylenediamine (DTPD), N-(1,4-dimethylpentyl)-N'-phenyl-p-phenylenediamine (7PPD), N-isopropyl-N'-phenyl-p-phenylenediamine (IPPD), and 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ); Internal 202401003 18 k) an activator; preferably comprising zinc compounds (including zinc complexes) and / or fatty acids; particularly preferably comprising zinc oxide, stearic acid and / or zinc ethylhexanoate (the combination of which, among other things, contributes to the complexation of sulfur); l) ozone-protecting waxes; m) masticating aids; preferably comprising 2,2'-dibenzamidodiphenyl disulfide (DBD); n) process aids; preferably comprising fatty acid esters and / or metal soaps, wherein preferred metal soaps comprise zinc soaps and / or calcium soaps; and / or A sulfur-crosslinkable rubber compound according to the invention is preferred, preferably as described above and / or below, wherein one or more than one further additive is comprised in a total quantity in the range of 3 to 150 phr, preferably from 4 to 100 phr, more preferably from 5 to 80 phr. The total quantity of the other additives includes 0.1 to 10 phr, preferably 1 to 8 phr, particularly preferably 1.5 to 4 phr, zinc oxide (ZnO). There are preferably no restrictions regarding the types of zinc oxide. A granular and / or powder form is preferred. The zinc oxide preferably has a BET surface area of ​​up to 100 m². 2 / g, preferably in a range of 1 to 100 m 2 / g. In some cases, a zinc oxide is preferred, where the BET surface area is less than 10 m². 2 / g. In other cases, a zinc oxide is preferred, with the BET surface area in the range of 10 to 100 m². 2 / g, especially preferred are so-called “nano-zinc oxides”. The following sulfur-curable rubber compound, which is particularly preferred in the context of the present invention (preferably as described in the text as preferred), comprises the following: (a) at least one polyisoprene rubber in a total quantity of 67 to 90 phr, (b) at least one organosilicon-modified styrene-butadiene rubber in a total amount of 10 to 33 phr and a glass transition temperature Tg in the range of -36 to -11 °C, (c) at least one silica with a BET surface area in the range of 255 to 295 m 2 / g in a total quantity of 42 to 75 phr, (d) at least one blocked mercaptosilane in a total amount of 7 to 14 pph, Internal 202401003 19 (e) at least one liquid polybutadiene which is terminally organosilicon-modified and has a weight mean molecular weight Mw according to GPC of 500 to 12000 g / mol and is present in a total amount of 3 to 15 phr, (f) at least one carbon black in a total quantity in the range of 2 to 8 phr, (g) Sulfur and / or at least one sulfur donor, wherein the sulfur donor is selected from the group consisting of thiuram disulfides and thiophosphates, and (h) at least one vulcanization accelerator, preferably a sulfenamid accelerator. The rubber compound according to the invention described above is particularly suitable for use in vehicle tires, especially pneumatic tires. In principle, its application in all tire components is conceivable. The rubber compound according to the invention is preferably used in the treads of vehicle tires, particularly preferably in the cap of treads with cap / base construction. In the context of the present invention, "cap" refers to the part of the tread that comes into contact with the roadway and is arranged radially outside (tread top or tread cap). In the context of the present invention, "base" refers to the part of the tread that is arranged radially inside and therefore does not come into contact with the road surface during ferry operation or only at the end of the tire's life (tread base). The present invention therefore also relates to a tread according to the invention comprising the sulfur-crosslinked rubber compound according to the invention, preferably as defined as preferred in this text. Preferably, the tread according to the invention comprises a profile. It is therefore preferably a profiled tread, and most preferably a truck tread. A tread strip according to the invention is particularly preferred if it has a profile which has (i) a profile depth in the range of 5 to 20 mm, preferably 7 to 16 mm, particularly preferably 8 to 13 mm; and / or Internal 202401003 20 (ii) one, two or more than two circumferential grooves with a bottle-shaped cross-sectional geometry; and / or (iii) a negative profile fraction of 15% or less, preferably 13% or less. The profile depth mentioned above preferably refers to the maximum profile depth. The tread according to the invention comprises one, two, or more than two circumferential grooves with a bottle-shaped cross-sectional geometry. This means that a corresponding circumferential groove is formed in the tread with a radially upper region and a radially lower region, as well as with two groove flanks, wherein lateral overhangs are formed on the groove flanks in the radially upper region of the groove such that the groove width in the radially upper region is smaller than in the radially lower region. This is typically often referred to as "bottle-shaped," "flask-like," or "teardrop-shaped." Lateral overhangs in the radially upper regions of grooves offer the advantage that, when new, a tread with such overhangs has more material on the running surface than one without them. This often results in better dry grip and slower radial wear. Another frequently cited advantage of a narrower groove width in the radially upper region is that the groove flanks at the lateral overhangs can support each other under tread load, typically leading to improved stiffness. Simultaneously, the wider groove width in the radially lower region compared to the radially upper region with the lateral overhangs ensures good drainage. Due to the increased negative volume in the radially lower region compared to the radially upper region, these grooves are sometimes also referred to as void generic grooves. Tire treads differ, among other things, in the size of their negative volume, often also referred to as void or negative fraction. In the context of the present invention, the terms tread void fraction and negative volume are synonymous. Furthermore, they refer to the total negative volume or the total negative fraction. Generally speaking, a high negative volume is advantageous for the performance of a vehicle tire in wet conditions, for example, to prevent or minimize aquaplaning. Conversely, a low negative volume is advantageous to Internal 202401003 21. To keep noise levels at the vehicle tire low. In this regard, legal noise limits, especially concerning noise levels during acceleration, pose new challenges for tire development. A further potential disadvantage of a high negative volume can be reduced driving stability and deterioration of the vehicle tire's structural integrity, as well as increased rolling resistance, the latter negatively impacting fuel consumption. Despite numerous past efforts, it therefore remains a challenge to create tire treads that are, on the one hand, as stable, energy-efficient, and quiet as possible, and on the other hand, as well-suited as possible for wet roads. The total negative volume of the tread according to the invention in the area of ​​the contact patch of a corresponding tire (see the following text for a tire according to the invention) is preferably 15% or less. This value is typically calculated as the quotient of the total negative volume and the total volume between a base area and a ground surface in the area of ​​the contact patch. The base area coincides with the smooth surface that the vehicle tire would have if no negative tread elements, such as grooves, and no positive tread elements, such as snow edges, were provided.The contact patch typically has a consistent shape along the circumference; in axial areas between two circumferential grooves, the contact patch usually lies at the level of the groove bottoms; in areas between a circumferential groove and a tire shoulder, the contact patch usually lies at the level of the groove bottom of the deepest transverse or oblique groove measured circumferentially. The ground contact area can typically correspond to the statically determined footprint at a load of 70% of the maximum load-carrying capacity and an internal pressure of 85%, determined according to ETRTO standards. These specifications refer to the tread in its new condition. For use in vehicle tires, the rubber compound is preferably formed as a ready-to-use mixture into the shape of a tread strip, preferably at least into the shape of a tread cap, before vulcanization and applied during the manufacture of the vehicle tire blank as is known. The tread strip, preferably at least the tread cap, can also be wound onto a tire blank in the form of a narrow strip of rubber compound. In the case of two-part treads (upper part: cap and lower part: base), the rubber compound according to the invention can be used for both the cap and the base, preferably for the cap. Internal 202401003 22 Therefore, the present invention also relates to a vehicle tire comprising at least one component which consists at least partly of a sulfur-crosslinked rubber compound according to the invention, preferably as described as preferred in the present text, wherein the component is preferably a tread strip according to the invention, preferably as described as preferred in the present text. In the context of the present invention, the term "vehicle tires" refers to pneumatic and solid rubber tires, including tires for industrial and construction vehicles, trucks, passenger cars, and two-wheelers. A truck tire is particularly preferred as the vehicle tire according to the invention. The invention will now be explained in more detail with reference to comparative and exemplary embodiments summarized in Tables 1 and 2, wherein the comparative examples are marked with V and the examples according to the invention with E. The terminal organosilicon-modified liquid polybutadiene was prepared by reacting 3-isocyanate-n-propyl-triethoxysilane with terminal hydroxy-functionalized polybutadiene (Krasol LBH-P3000), analogous to the description in US 2002 / 0082333 A1, paragraph

[0053] , prepared using 155 g of 3-isocyanate-n-propyl triethoxysilane per kg of Krasol LBH-P3000. The reaction was carried out at 80 °C in a 5 L (liter) reactor. The compound was prepared according to standard rubber industry procedures under normal conditions in three stages using a laboratory mixer. In the first stage (base mix), all components except the vulcanization system (sulfur and vulcanization-influencing substances) were mixed. In the second stage, the base mix was thoroughly blended again. Finally, in the third stage (final mix), the vulcanization system was added, and the mixture was blended at 90 to 120 °C. Test specimens were produced from all mixtures by vulcanization after 20 minutes under pressure at 160°C and material properties typical for the rubber industry (see “physical properties”) were determined using the test procedures specified below. Internal 202401003 23 Ingredients used a) NR: Natural rubber TSR-10;b 'SBR: SSBR, SPRINTAN SLR 4602, Trinseo; Styrene content: 21%, Vinyl content: 63%, Tg -25°C; functionalized for chemical interaction with silica; Mw: 420 kDa c 'SBR: SSBR, SPRINTAN SLR 3402, Trinseo; Styrene content 15%, Vinyl content: 30%, Tg -60°C, functionalized for chemical interaction with silica, Mw: 470 kDa d) liquid, organosilicon-modified polybutadiene according to formula III), vinyl content: 63%, trans content = 18%, cis content = 19%, T g = - 56 °C, Mw = 7400 g / mol, Mn = 6300 g / mol e) Silica Premium SW from Solvay, BET surface area: approx. 275 m² 2 / g Silane according to formula IV-b): (EtO)3Si-(CH2)3-S-(CH2)6-SC(=O)-CH3 g) NXT Silane (EtO)3Si-(CH2)3-SC(=O)-(CH2)e-CH3 from Momentive Performance Materials h) Anti-aging agents: 6PPD + TMQ Activators: Zinc oxide (ZnO) + stearic acid + zinc soaps j) Accelerators: DPG + TBBS k) Sulfur donor: TBzTD Internal 202401003 24 Table 1 Internal 202401003 25 The physical and tire properties were determined as follows: Shore A hardness (RT and 70°C) according to DIN ISO 7619-1 Stress value at 300% elongation (M 300; RT), tensile strength (RT) and elongation at break (RT and 70°C) according to DIN 53 504 Rebound elasticity (rebound; RT and 70°C) according to DIN 53 512 Rolling resistance according to ISO 28580 Wet braking: ABS braking from 80 km / h, wet asphalt, low (low p) Cut & Chip: visual assessment after 1000 km on dry gravel road, outside temperature T = approx. 30 °C on a 315 / 70 R 22.5" tire Abrasion: Weight loss of the respective tires in size 205 / 75 R17.5 CHS3 after 15,000 km of road driving at an average temperature of approximately 12 °C. Aged Cut & Chip: Repeat the test as described above with a shortened distance after aging in a climate chamber, 28 days at 70°C Cracks (End of life test): Visual assessment for various cracking phenomena (e.g., cracks, cuts, aging cracks, etc.) of 87 or 88 Continental Efficient Pro 315 / 70 R22.5 tires, respectively, used in the field in Europe (Spain, Austria, Switzerland) in the steering axle position after approximately 130,000 km. The evaluation refers to the number of tires with cracks in the tread area compared to the reference (V1). The comparative example V1 shown in Table 1 is based on the exemplary teaching of WO 2023 / 104252 A1. The physical properties shown in Table 1 were determined after the test specimens were provided. For the tire properties, 100% represents a standard. Values ​​greater than 100% represent an improvement, whereas values ​​less than 100% indicate a deterioration compared to reference V1. The tire properties rolling resistance, wet braking, and abrasion were also carried out immediately after the test tires were provided, using tires with dimensions 205 / 75 R17.5 CHS3, whereas the "Cut & Chip," "Aged Cut & Chip," and "End of Life" tests were performed using test tires with dimensions 315 / 70 R22.5. A special feature is the "Cut & Chip (Aged)" test. This involves determining the cut and chip behavior after artificially induced aging of the tire. This reflects the cut and chip behavior after a simulated tire lifespan. This test allows for a relatively quick assessment of the tire's quality over its entire lifespan. Internal 202401003 26 In general, the results show that the already good initial values ​​of the V1 are largely confirmed in the E1. This is evident in the physical properties of the test specimens regarding hardness (66 vs. 65), M 300 RT (13 vs. 12), tensile strength RT (23 vs. 22), and elongation at break (506 vs. 513 and 548 vs. 519; which can be considered approximately equivalent). However, it is noteworthy that an improvement in rebound at RT (an indicator of wet braking) can be observed, as the value decreases from 50% to 47%. This difference is significant and is also reflected in the tire's wet braking performance (100% vs. 103%). This difference is also significant. Particularly remarkable is the simultaneous improvement in the tire's rolling resistance (100% vs. 103%). This is surprising for several reasons.First, rolling resistance and wet braking performance are typically in conflict, meaning that improving one usually leads to a deterioration of the other. Surprisingly, this is not the case here. Rolling resistance improves along with wet braking performance. In other words, this conflict is resolved at a higher level in the tire according to the invention and, moreover, unexpectedly behaves proportionally to each other. Second, the physical properties did not suggest such an effect, since the rebound at 70°C (an indicator of rolling resistance) did not change (64 vs. 64). The cut and chip resistance of the tire remains unchanged immediately after the test tire E1 is provided (100 vs. 100). However, a surprising improvement in cut and chip resistance is observed for E1 after simulated aging ("cut and chip aged"). The test tire E1 is able to maintain its high level of crack resistance for a longer period. This is already indicated by the simulated aging and ultimately confirmed by the "end of life test." In other words, V1's cut and chip resistance deteriorates significantly more over the simulated lifetime than that of the tire E1 according to the invention, where the decline is considerably less pronounced. In the aforementioned "end of life test," both the tires according to the invention and the comparison tires were subjected to a visual inspection for crack formation on the tread surface.This study showed that tires meeting the E1 standard exhibited at least 15% fewer significant cracking compared to tires meeting the V1 standard. The field test, covering approximately 130,000 km, was conducted in various European countries (Germany, Austria, Spain), thus encompassing diverse climatic conditions. The aforementioned improvement represents the minimum achieved. Furthermore, comparative results in Spain demonstrate that tests conducted under comparatively high temperatures yielded an additional improvement (up to 27% fewer tires with significant cracking). This indicates that... Internal 202401003 27 The advantage of the invention becomes particularly evident when the thermal stress is comparatively high. The comparison between V1 and E1 shows that the very advantageous improved cut & chip resistance over a simulated tire lifetime, combined with significantly improved wet braking and also improved rolling resistance, results from a specific combination of high-surface-area silica, an organosilicon-modified SBR, and an organosilicon-modified liquid diene polymer. Table 1 shows that the best results are achieved with test tires according to E1. However, the effect underlying the invention also occurs with other combinations. A tire according to the invention, E2, comprises a total of two styrene-butadiene rubbers (SBRs) suitable for chemical interaction with silica, only one of which has a glass transition temperature Tg in the range of -45°C to -5°C. The second SBR has a glass transition temperature of -60°C, which is outside the range of -45°C to -5°C. An alternative silane is also used. Although the test tire according to E2 initially shows a minimal reduction in wet braking performance (99 vs. 100) and a significant reduction in initial cut and chip quality (95 vs. 100), the surprising improvement in simulated aging (105 vs. 100) is also evident here. This test tire also showed improved long-term durability in initial tests. Internal

Claims

202401003 28 Patent claims 1. Sulfur-curable rubber compound comprising (a) at least one polyisoprene rubber in a total quantity of 51 to 95 phr, (b) at least one styrene-butadiene rubber in a total quantity of 5 to 49 phr, (c) at least one silica with a BET surface area in a range of 225 to 400 m 2 / g in a total quantity of 30 to 95 phr; (d) at least one silane in a total amount of 1 to 20 pphf selected from the group consisting of blocked mercaptosilanes, unblocked mercaptosilanes and polysulfide silanes, wherein the styrene-butadiene rubber according to (b) is organosilicon-modified and each has a glass transition temperature Tg according to DSC in the range of -45 to -5°C, and the mixture further comprises (e) at least one liquid diene polymer which is organosilicon-modified and has a weight mean molecular weight Mw according to GPC in the range of 500 to 12000 g / mol and is present in a total amount in the range of 1 to 35 phr.

2. The rubber compound according to claim 1, wherein it does not comprise a resin.

3. The rubber compound according to claim 1 or 2, wherein the at least one polyisoprene rubber according to (a) is present in a total amount of 60 to 92 phr, preferably 67 to 90 phr, most preferably 73 to 85 phr.

4. The rubber compound according to any one of claims 1 to 3, wherein the at least one styrene-butadiene rubber according to (b) is present in a total amount of 8 to 40 phr, preferably 10 to 33 phr, most preferably 15 to 27 phr.

5. The rubber compound according to any one of claims 1 to 4, wherein the at least one styrene-butadiene rubber according to (b) has a respective glass transition temperature Tg in the range of -40 to -8°C, preferably from -36 to -11°C, more preferably from -32 to -14°C, most preferably from -28 to -17°C.

6. The rubber compound according to any one of claims 1 to 5, wherein the silica according to (c) provides a BET surface area in the range of 230 to 380 m². 2 / g Internal 202401003 29 preferably from 230 to 360 m 2 / g, further preferably from 235 to 340 m 2 / g, especially preferably from 240 to 310 m 2 / g, preferably from 255 to 295 m 2 / G.

7. The rubber compound according to any one of claims 1 to 6, wherein the at least one silane according to (d) is selected from the group consisting of blocked mercaptosilanes and unblocked mercaptosilanes, preferably blocked mercaptosilanes.

8. The rubber compound according to any one of claims 1 to 7, wherein the at least one organosilicon-modified liquid diene polymer according to (e) comprises at least one residue according to formula I) I) (R1 R2R3)Si- modified, wherein - R1, R2, R3 are independently selected from linear or branched alkoxy, cycloalkoxy, alkyl, cycloalkyl or aryl groups, each comprising 1 to 20 carbon atoms; and - the remainder according to formula I) is directly or via a bridge to the polymer chain of the diene polymer, the bridge being based on a divalent, saturated or unsaturated hydrocarbon, optionally containing cyclic, aliphatic and / or aromatic groups and optionally heteroatoms in or on the hydrocarbon.

9. The rubber compound according to any one of claims 1 to 8, wherein the at least one organosilicon-modified liquid diene polymer according to (e) comprises a polybutadiene (abbreviated PB) and preferably has an overall structure according to formula III):

10. The rubber compound according to any one of claims 1 to 9, the compound further comprising: (f) at least one carbon black, preferably in a total quantity in the range of 0.1 to 25 phr, more preferably from 0.5 to 20 phr, more preferably from 1 to 15 Internal 202401003 30 phr, particularly preferably from 1.5 to 10 phr, most preferably from 2 to 8 phr.

11. The rubber compound according to any one of claims 1 to 10, further comprising: (g) Sulfur and / or at least one sulfur donor, wherein the sulfur donor is preferably selected from the group consisting of thiuram disulfides and thiophosphates, and / or (h) at least one vulcanization accelerator, preferably a sulfenamid accelerator.

12. The rubber compound according to any one of claims 1 to 11 comprising (a) at least one polyisoprene rubber in a total quantity of 67 to 90 phr, (b) at least one organosilicon-modified styrene-butadiene rubber in a total amount of 10 to 33 phr and a glass transition temperature Tg in the range of -36 to -11°C, (c) at least one silica with a BET surface area in the range of 255 to 295 m 2 / g in a total quantity of 42 to 75 phr, (d) at least one blocked mercaptosilane in a total amount of 7 to 14 pph, (e) at least one liquid polybutadiene terminally organosilicon-modified, having a weight mean molecular weight Mw according to GPC of 500 to 12000 g / mol and being present in a total quantity of 3 to 15 phr, (f) at least one carbon black in a total quantity in the range of 2 to 8 phr, (g) Sulfur and / or at least one sulfur donor, wherein the sulfur donor is selected from the group consisting of thiuram disulfides and thiophosphates, and (h) at least one vulcanization accelerator, preferably a sulfenamid accelerator.

13. Tread for a vehicle tire comprising a sulfur-crosslinked rubber compound according to any one of claims 1 to 12.

14. The tread according to claim 13 comprising a profile which has (i) a profile depth in the range of 5 to 20 mm, preferably 7 to 16 mm, particularly preferably 8 to 13 mm; and / or Internal 202401003 31 (ii) one, two or more than two circumferential grooves with a bottle-shaped cross-sectional geometry; and / or (iii) a negative profile area of ​​15% or less, preferably 13% or less.

15. Vehicle tire comprising at least one component which consists at least partly of a sulfur-crosslinked rubber compound according to any one of claims 1 to 12, wherein the component is preferably a tread strip according to claim 13 or 14. Internal

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