DE102016212406A1 - Sulfur crosslinkable rubber compound - Google Patents

Abstract

The invention relates to a sulfur-crosslinkable rubber mixture for elastomer products, in particular for pneumatic vehicle tires, comprising at least one diene rubber, at least one adhesive system, at least one silica and at least one silane coupling agent. Furthermore, the invention relates to pneumatic vehicle tires comprising the sulfur-crosslinked rubber composition. For improved durability of the elastomeric products, at least one silane coupling agent is a silylated core polysulfide having the general formula I) [Y1R1SX-] m [G1 (R2SiX1X2X3) a] n [G2] o [R3Y2] p.I)

Description

The invention relates to a sulfur-crosslinkable rubber mixture for elastomer products, in particular for pneumatic vehicle tires, comprising at least one diene rubber, at least one adhesive system, at least one silica and at least one silane coupling agent. Furthermore, the invention relates to pneumatic vehicle tires comprising the sulfur-crosslinked rubber composition.

Many elastomer products, such as pneumatic vehicle tires, drive belts. Conveyor belts o. Ä., Are with textile or metallic reinforcements, z. B. with brass-plated steel cord, reinforced to withstand high mechanical stresses. Pneumatic pneumatic tires have reinforcements in the belt, the belt bandage, the bead core, the bead reinforcer and the carcass. In order to ensure the durability of the rubber-reinforcement composite, the embedding rubber mixture (rubber mixture) should show a good adhesion to the reinforcement, whereby the adhesion should not be impaired by aging and moist storage. The vulcanizates should also have high dynamic and mechanical resistance and a low tendency to cracking and growth. For example, it has been found that thermal and mechanical stresses on strength strengthened elastomeric products result in fractures and cracks in the rubber compound blends that ultimately result in reduced durability.

Even with other components within elastomeric products that are not directly in contact with reinforcements, such as tread base plates, belt edge strips or bead strips, the mixing systems mentioned above are often used with an adhesive system. In tires, mixtures for non-tread components are referred to as so-called bodymixes. Bodymischungen are z. B. Belt, carcass, bandage, bead reinforcer, bead profile, belt edge, or tread compound. These components are usually exposed to high thermal and mechanical loads and should withstand these stresses.

The adhesion of rubber to textile reinforcements is effected by impregnation (for example with resorcinol-formaldehyde resins in combination with rubber latexes, RFL-dip), in the direct process with adhesive mixtures or via adhesive solutions of unvulcanized rubber with polyisocyanates.

The rubber-metal adhesion can be positively influenced by the addition of so-called reinforcing resins in the gumming mixture. As reinforcing resins z. As lignin, phenol-formaldehyde resins with hardeners and polymer resins. To improve rubber-to-metal adhesion, it has long been known to use cobalt salts and / or a resorcin-formaldehyde-silica system or a resorcin-formaldehyde system as additives for the gum mixtures. Of the resorcinol resins, the precondensates can also be used. Gummierungsmischungen with cobalt salts and a resorcinol-formaldehyde-silicic acid system are z. B. off KGK rubber rubber plastics No. 5/99, p. 322-328, from GAK 8/1995, p. 536 and the EP-A-1 260 384 known.

The diene rubbers present in rubber mixtures or bodymixes may be all diene rubbers known to the person skilled in the art. Examples of diene rubbers commonly used in rubber compositions are natural polyisoprene (NR), synthetic polyisoprene (IR), butadiene rubber (BR) and styrene-butadiene rubber (SBR).

In known gum mixtures or bodymixings, carbon black and / or silica are used as fillers in the following carbon black to silica ratios: 100: 0 to 80:20 and 20:80 to 0: 100.

Sulfur crosslinkable gum mixtures according to the preamble of claim 1, for example, from DE 10 2011 053 450 A1 , of the DE 10 2011 053 451 A1 and the DE 696 02 212 T2 known. In these documents, different silicas are proposed for the gum mixtures.

For the connection of the silicic acid to the rubber matrix becomes in the DE 10 2011 053 450 A1 and the DE 10 2011 053 451 A1 in the embodiments as Silankupplungsagens the bifunctional organosilane 3,3'-bis (triethoxysilylpropyl) tetrasulfide (TESPT) used on carbon black in the form of X 50-S ^® Evonik Industries.

It is an object of the present invention to provide sulfur-crosslinkable rubber compositions containing an adhesive system for elastomer products, in particular for pneumatic vehicle tires, which lead to improved durability in the elastomer products.

The object is achieved according to the invention in that at least one silane coupling agent is a polysulfide having a silylated core of the general empirical formula I) [Y ¹ R ¹ S _X -] _m [G ¹ (R ² SiX ¹ X ² X ³ ) _a ] _n [G ² ] _o [R ³ Y ² ] _p , I) is
in which:
each occurrence of G ^{1 is} independently selected from a polyvalent hydrocarbon group containing up to 30 carbon atoms and a polysulfide group and having the general formula: [(CH ₂ ) _b -] _c R ⁴ [- (CH ₂ ) _d S _x -] _e ; each occurrence of G ^{2 is} independently selected from a polyvalent hydrocarbon group containing up to 30 carbon atoms and a polysulfide group and having the general formula: [(CH ₂ ) _b -] _c R ⁵ [- (CH ₂ ) _d S _x -] _e ; each occurrence of R ¹ and R ^{3 is} independently a divalent branched or unbranched alkyl, alkenyl or alkynyl group of up to 5 carbon atoms in which one hydrogen atom is substituted with a Y ¹ or Y ² group;
each occurrence of Y ¹ and Y ^{2 is} independently a silyl group having the formula -SiX ¹ X ² X ³ ;
each occurrence of R ^{2 is} an unbranched hydrocarbon represented by - (CH ₂ ) _f -, wherein f is a number from 0 to 3;
each occurrence of R ^{4 is} independently a polyvalent cyclic alkyl or aryl group of 3 to 10 carbon atoms, and in which a + c + e - 1 hydrogens have been replaced;
each occurrence of R ^{5 is} independently a polyvalent branched or unbranched alkyl, alkenyl, alkynyl, aryl or aralkyl group having 3 to 10 carbon atoms in which c + e - 1 hydrogens have been replaced;
each occurrence of X ^{1 is} independently selected from the hydrolyzable group consisting of -OH and -OR ⁶ , wherein R ^{6 is} a monovalent branched or unbranched alkyl or alkenyl group having up to 5 carbon atoms, and -OSi containing groups selected from the group consisting of Condensation of silanols result;
each occurrence of X ² and X ^{3 is} independently selected from the group consisting of R ⁶ wherein R ^{6 is} a monovalent branched or unbranched alkyl or alkenyl group of up to 5 carbon atoms;
each occurrence of the indices a, b, c, d, e, f, m, n, o, p and x is independently given, where a is 1 to 2; c and e are 1; b is 1 to 3; d is 1 to 3; m and p are 1; n is 1 to 10; o is 0 to 1; and x is 1 to 8.

It has surprisingly been found that by using the specific silane coupling agent having the general formula I) selected from the large group of silane coupling agents, the durability of elastomeric products can be significantly improved. It has been found that the rubber mixtures with the silylated core polysulfide of the general formula I) as a silane coupling agent are distinguished by improved crack resistance without having to accept losses in other properties such as mixture viscosity, vulcanization behavior and adhesion. Thus, the elastomer products better withstand dynamic mechanical loads and the life is improved. If the rubber mixtures according to the invention are used for example as Gürtelgummierungsmischungen in pneumatic vehicle tires, this experienced by a significant increase in life.

The polysulfides with silylated core of the general formula I) serve as silane coupling agents. They serve in silicic acid mixtures to improve the processability and the connection of the polar filler to the rubber. 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).

The polysulfides with silylated core of the general empirical formula I) are z. B. in the US 20080161477 A1 and the EP 2 114 961 B1 described as so-called "silated core polysulfides" (SCP). They are silane coupling agents with oligo-sulfur bridges which possess a cyclohexyl spacer group (cyclohexyl spacer). They are intended to improve the abrasion behavior of rubber compounds.

In addition to the aforementioned silane coupling agents, the gum mixture may contain further silane coupling agents known to those skilled in the art, such as bifunctional organosilanes and blocked or unblocked mercaptosilanes.

wobei x = 1 bis 8 ist.According to a preferred embodiment of the invention, the rubber mixture contains as silane coupling agent at least one silane having the following structural formula

where x = 1 to 8.

enthält.It is particularly preferred if the rubber mixture as silane coupling agent at least (2-triethoxysilylethyl) bis (7-triethoxysilyl-3,4,5,6-tetrathianonyl) cyclohexane (or 1,1 '- [[4- [2 - (triethoxysilyl) ethyl] -1,2-cyclohexanediyl] di-2,1-ethanediyl] bis [4- [3- (triethoxysilyl) propyl] tetrasulfide), having the following structural formula

contains.

With this silane coupling agent, particularly good results with regard to crack resistance could be achieved.

• – 70 bis 100 phr (Gewichtsteile, bezogen auf 100 Gewichtsteile der gesamten Kautschuke in der Mischung) synthetisches und/oder natürliches Polyisopren,
• – bis zu 30 phr zumindest eines Polybutadiens,
• – 20 bis 100 phr zumindest einer Kieselsäure,
• – 2 bis 10 phr zumindest eines Silankupplungsagenzes und
• – ein Haftsystem.

The sulfur-crosslinkable rubber mixture preferably contains

• From 70 to 100 phr (parts by weight, relative to 100 parts by weight of the total rubbers in the mixture) of synthetic and / or natural polyisoprene,
• - up to 30 phr of at least one polybutadiene,
• From 20 to 100 phr of at least one silica,
• 2 to 10 phr of at least one silane coupling agent and
• - a detention system.

The term phr (parts per hundred parts of rubber by weight) used in this document is the quantity used in the rubber industry for mixture formulations. The dosage of the parts by weight of the individual substances is always based on 100 parts by weight of the total mass of all the rubbers present in the mixture.

With such a mixture particularly good results could be achieved in terms of durability, at the same time there were good adhesion and good processability.

Preferably, the rubber composition contains from 70 to 100 phr of natural rubber (NR), which is biochemically synthesized in plants polyisoprene having a cis-1,4 content of more than 99%.

As a further rubber, the preferred rubber mixture contains up to 30 phr, preferably 15 to 25 phr, of at least one polybutadiene (BR). For particularly good adhesion properties and good processing behavior, the polybutadiene is one having a cis content of greater than 95% by weight or a functionalized Li polybutadiene, e.g. B. BR1250 H from the company Nippon Zeon or such functionalized polybutadienes, as described in the EP 2 289 990 A1 are described.

In addition to the rubber types mentioned, the rubber mixture can also other rubbers such. As styrene-butadiene rubber.

The preferred rubber mixture contains 20 to 100 phr, preferably 40 to 80 phr, of at least one silica. Accordingly, it is also possible for several silicic acids to be present side by side in the mixture. The silicas may be the silicas known to those skilled in the art which are 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 70 to 235 m ² / g and most preferably from 70 to 205 m ² / g, and a CTAB surface (according to ASTM D 3765 ) from 30 to 400 m ² / g, preferably from 30 to 255 m ² / g, particularly preferably from 65 to 230 m ² / g and very particularly preferably from 65 to 200 m ² / g. Such silicas lead z. B. in rubber blends for inner tire components to particularly good physical properties of the vulcanizates. In addition, there may be advantages in the mixing processing by reducing the mixing time with constant product properties, which lead to improved productivity. As silicas can thus z. B. both those of the type Ultrasil ^® VN3 (trade name) from Evonik and silicas with a relatively low BET surface area (such as Zeosil ^® 1115 or Zeosil ^® 1085 from Solvay) and highly dispersible silicas, so-called HD silicas (z. B. zeosil ^® 1165 MP from Solvay).

Furthermore, the preferred gum mixture contains from 2 to 10 phr of at least one silane coupling agent, wherein at least one silane coupling agent is a silylated core polysulfide of the general empirical formula I) [Y ¹ R ¹ S _X -] _m [G ¹ (R ² SiX ¹ X ² X ³ ) _a ] _n [G ² ] _o [R ³ Y ² ] _p , I) is.

The rubber mixture according to the invention contains an adhesive system. Depending on whether the mixture is to be used for textile or metallic reinforcements, either an adhesive system for rubber-textile adhesion or an adhesion system for rubber-metal adhesion is used.

Preferably, the adhesive system is a steel cord adhesion system based on organic cobalt salts and reinforcing resins and greater than 2.5 phr sulfur. If such mixtures come into contact with metallic reinforcing agents, the improvement in adhesion and cracking behavior is particularly beneficial, since the metallic reinforcements are increasingly exposed to corrosion in the event of loss of adhesion and crack formation, which severely impairs the life of the elastomer products, in particular pneumatic vehicle tires.

The organic cobalt salts are usually used in amounts of 0.2 to 2 phr. As cobalt salts z. For example, cobalt stearate, borate, borate alkanoates, naphthenate, rhodinate, octoate, adipate, etc. can be used. As reinforcing resins can resorcinol-formaldehyde resins, for example resorcinol-hexamethoxymethylmelamine resins (HMMM) or hexamethylenetetramine resorcinol resins (HEXA), or modified phenolic resins, for example, Alnovol ^® grades, are used. Of the resorcinol resins, the precondensates can also be used.

According to an advantageous embodiment of the invention, the rubber mixture contains less than 15 phr process auxiliaries, which are understood to mean oils and other viscosity-reducing substances. These process auxiliaries may be, for example, plasticizer oils or plasticizer resins. It has been found that the amount of process auxiliaries added to the mixture for better mixing, extrusion and calendering can be greatly reduced compared to conventional mixtures and the mixtures according to the invention nevertheless have a good processing behavior with moderate viscosity and the vulcanizates have good dynamic properties. have mechanical properties.

The rubber mixture of the invention may contain up to 15 phr of at least one carbon black. However, it can also be completely free of soot. Suitable carbon black types are those which are customary for gum mixtures, for example N 326 carbon black.

In addition to carbon black and silicas, the rubber mixture may also contain further fillers, such as aluminosilicates, chalk, starch, magnesium oxide, titanium dioxide 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.

As further additives, the rubber mixture may contain other customary additives in customary parts by weight, such as vulcanization accelerators, vulcanization retarders, zinc oxide and anti-aging agents.

The preparation of the rubber mixture according to the invention is carried out in a conventional manner, wherein initially a base mixture which contains all components except the vulcanization system (sulfur and vulcanization-influencing substances) is prepared in one or more mixing stages and then by adding the vulcanization Ready mix is produced. Subsequently, the mixture is processed further.

The rubber composition can be used in a wide variety of elastomeric products where crack resistance and heat build-up have an impact on product life.

The rubber mixture is preferably used as a so-called bodymix in pneumatic vehicle tires, that is to say as a rubber mixture for reinforcements and / or as a mixture for further inner tire components. Bodymixes are rubber compounds for tires that are not treads. Accordingly, bodymix mixtures for z. B. the following, often strength carrier containing tire components: belt, belt bandage, carcass, bead reinforcement, bead strip, belt edge and tread base plates. In such components are high thermal and mechanical loads, which must withstand the rubber mixtures. According to the invention, one or more components within a tire can be provided with the mixture according to the invention.

A particularly high extension of the service life of pneumatic vehicle tires can be achieved by providing the usually metallic belt layers with the rubber mixture according to the invention. A tire having a belt with the mixture according to the invention as a belt rubberization and which is constructed and vulcanized by conventional methods, is characterized by a very good belt durability.

Alternatively or in parallel, the carcass may be provided with the rubber composition. Preferably, this is the steel cord carcass of a commercial vehicle tire.

Also, the bead reinforcement and / or the belt edge and / or the tread base plate and / or the bead strips may consist of the sulfur-crosslinked rubber mixture. The life of a tire can be improved.

The invention will now be explained in more detail with reference to a comparison and an embodiment, which are summarized in Table 1.

For all mixing examples contained in the table, the quantities given are parts by weight based on 100 parts by weight of total rubber (phr). The comparison mixture is marked with V, the gum mixture according to the invention with E. Blend V (1) is a belt gum blend with a conventional silane coupling agent, 3,3'-bis (triethoxysilylpropyl) tetrasulfide (TESPT) on carbon black in the form of X 50- ^S® , which also acts as a sulfur donor. The mixture E (2) contains as silane coupling agent (2-triethoxysilylethyl) bis- (7-triethoxysilyl-3,4,5,6-tetrathianonyl) cyclohexane.

• • Shore-A-Härte bei Raumtemperatur und 70 °C gemäß DIN 53 505
• • Rückprallelastizität bei Raumtemperatur und 70 °C gemäß DIN 53 512 ,
• • Verlustfaktor tan δ_max bei 55 °C als Maximalwert über den Dehnungssweep aus dynamisch-mechanischer Messung gemäß DIN 53 513
• • Spannungswert (Modul) bei 50, 100, 200 und 300 % Dehnung bei Raumtemperatur gemäß DIN 53 504
• • Zugfestigkeit bei Raumtemperatur gemäß DIN 53 504
• • Reißdehnung bei Raumtemperatur gemäß DIN 53 504
• • Bruchenergiedichtebei Raumtemperatur bestimmt im Zugversuch gemäß DIN 53 504 , wobei die Bruchenergiedichte die bis zum Bruch erforderliche Arbeit, bezogen auf das Volumen der Probe, ist
• • Monsanto Ermüdungstest (Fatigue to Failure Tester) gemäß ASTM D4482 bei 101 % Dehnung und Raumtemperatur einer frischen Probe sowie einer Probe nach 14-tägiger Alterung bei 70 °C in Luft

Tabelle 1 Bestandteile Einheit V(1) E(2) Naturkautschuk phr 80 80 Polybutadiena phr 20 20 Kieselsäure phr 60 60 Ruß N339 phr - 5,15 Silankupplungsagens A^b phr 10,30 - Silankupplungsagens B^c phr - 5,15 Prozesshilfsmittel phr 12 12 Alterungsschutzmittel phr 3,75 3,75 organisches Cobaltsalz phr 0,36 0,36 Harz aus Resorcin und Formaldehydspender phr 6,35 6,35 Zinkoxid phr 8 8 Beschleuniger phr 1,5 1,5 Schwefel phr 4,3 4,3 Eigenschaften Shore A-Härte bei RT Shore A 83 84 Shore A-Härte bei 70 °C Shore A 80 80 Rückprallelastizität bei RT % 38 39 Rückprallelastizität bei 70 °C % 51 51 tan δ_max bei 55 °C - 0,164 0,161 Spannungswert 50 % MPa 2,6 2,5 Spannungswert 300 % MPa 14,6 14,4 Zugfestigkeit bei RT MPa 20,3 20,7 Reißdehnung bei RT % 449 458 Bruchenergiedichte J/cm³ 43 44 Monsanto Ermüdung vor Alterung kZyclen 1007 1096 Monsanto Ermüdung nach Alterung kZyclen 136 195 ^ahigh-cis Polybutadien
^bSilankupplungsagens 3,3‘-Bis(triethoxysilylpropyl)tetrasulfid (TESPT) auf Ruß im Gewichtsverhältnis 1:1, X 50-S^®, Evonik Industries, Deutschland
^cSilankupplungsagens (2-Triethoxysilylethyl)-bis-(7-triethoxysilyl-3,4,5,6-tetrathianonyl)cyclohexan Mixture preparation was carried out under customary conditions in several stages in a laboratory tangential mixer. Test specimens were prepared from all mixtures by vulcanization under pressure at 160 ° C. for 20 minutes, and the material properties typical of these rubber specimens were determined by the test methods indicated below.

• • Shore A hardness at room temperature and 70 ° C according to DIN 53 505
• • Rebound resilience at room temperature and 70 ° C according to DIN 53 512 .
• • Dissipation factor tan δ _max at 55 ° C as the maximum value over the strain sweep from dynamic-mechanical measurement according to DIN 53 513
• • Voltage value (modulus) at 50, 100, 200 and 300% elongation at room temperature according to DIN 53 504
• • tensile strength at room temperature according to DIN 53 504
• • Elongation at room temperature according to DIN 53 504
• • Breaking energy density at room temperature determined in the tensile test according to DIN 53 504 wherein the fracture energy density is the work required to break, based on the volume of the sample
• • Monsanto Fatigue to Failure Tester according to ASTM D4482 at 101% strain and room temperature of a fresh sample and a sample after aging for 14 days at 70 ° C in air

Table 1 ingredients unit V (1) E (2) natural rubber phr 80 80 Polybutadiena phr 20 20 silica phr 60 60 Carbon black N339 phr - 5.15 A silane coupling agent ^b phr 10.30 - Silane coupling agent B ^c phr - 5.15 processing aids phr 12 12 Anti-aging agents phr 3.75 3.75 organic cobalt salt phr 0.36 0.36 Resin from resorcinol and formaldehyde donor phr 6.35 6.35 zinc oxide phr 8th 8th accelerator phr 1.5 1.5 sulfur phr 4.3 4.3 properties Shore A hardness at RT Shore A 83 84 Shore A hardness at 70 ° C Shore A 80 80 Rebound resilience at RT % 38 39 Rebound resilience at 70 ° C % 51 51 tan δ _max at 55 ° C - 0.164 0.161 Voltage value 50% MPa 2.6 2.5 Voltage value 300% MPa 14.6 14.4 Tensile strength at RT MPa 20.3 20.7 Elongation at RT % 449 458 Fracture energy density J / cm ³ 43 44 Monsanto fatigue from aging kZyclen 1007 1096 Monsanto fatigue after aging kZyclen 136 195 ^a high-cis polybutadiene
^b Silane coupling agent 3,3'-bis (triethoxysilylpropyl) tetrasulfide (TESPT) on carbon black in the weight ratio 1: 1, X 50- ^S® , Evonik Industries, Germany
^c silane coupling agent (2-triethoxysilylethyl) bis- (7-triethoxysilyl-3,4,5,6-tetrathianonyl) cyclohexane

It can be seen from Table 1 that the rubber composition according to the invention has improved crack resistance in the Monsanto fatigue test before and after aging, so that improved durability is obtained for mechanically loaded elastomer products with this rubber mixture. The rubber composition shown in Table 1 can be used, for example, as a belt rubber or belt edge strip for pneumatic vehicle tires and leads to improved durability in the tire. It is also noteworthy that the other mixing properties, such as hardness, tensile strength and rebound resilience, in the comparison mixture and the mixture according to the invention are at a very similar level, so that these properties with improvement of the crack resistance by the use of the special Silankupplungsagenzes accepted in the mixture no losses Need to become.

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

• EP 1260384A [0005]
• DE 102011053450 A1 [0008, 0009]
• DE 102011053451 A1 [0008, 0009]
• DE 69602212 T2 [0008]
• US 20080161477 A1 [0014]
• EP 2114961 B1 [0014]
• EP 2289990 A1 [0023]

Cited non-patent literature

• KGK rubber rubber plastics no. 5/99, p. 322-328, from GAK 8/1995, p. 536 [0005]
• DIN ISO 9277 [0025]
• DIN 66132 [0025]
• ASTM D 3765 [0025]
• DIN 53 505 [0043]
• DIN 53512 [0043]
• DIN 53 513 [0043]
• DIN 53 504 [0043]
• DIN 53 504 [0043]
• DIN 53 504 [0043]
• DIN 53 504 [0043]
• ASTM D4482 [0043]

Claims (12)

Sulfur-crosslinkable rubber mixture for elastomer products, in particular for pneumatic vehicle tires, containing at least one diene system, at least one silicic acid and at least one silane coupling agent, characterized in that at least one silane coupling agent comprises a silylated core polysulfide of the general empirical formula I) [Y ¹ R ¹ S _X -] _m [G ¹ (R ² SiX ¹ X ² X ³ ) _a ] _n [G ² ] _o [R ³ Y ² ] _p , I) wherein: each occurrence of G ^{1 is} independently selected from a polyvalent hydrocarbon group containing up to 30 carbon atoms and a polysulfide group and having the general formula: [(CH ₂ ) _b -] _c R ⁴ [- (CH ₂ ) _d S _x -] _e ; each occurrence of G ^{2 is} independently selected from a polyvalent hydrocarbon group containing up to 30 carbon atoms and a polysulfide group and having the general formula: [(CH ₂ ) _b -] _c R ⁵ [- (CH ₂ ) _d S _x -] _e ; each occurrence of R ¹ and R ^{3 is} independently a divalent branched or unbranched alkyl, alkenyl or alkynyl group of up to 5 carbon atoms in which one hydrogen atom is substituted with a Y ¹ or Y ² group; each occurrence of Y ¹ and Y ^{2 is} independently a silyl group having the formula -SiX ¹ X ² X ³ ; each occurrence of R ^{2 is} an unbranched hydrocarbon represented by - (CH ₂ ) _f -, wherein f is a number from 0 to 3; each occurrence of R ^{4 is} independently a polyvalent cyclic alkyl or aryl group of 3 to 10 carbon atoms, and in which a + c + e - 1 hydrogens have been replaced; each occurrence of R ^{5 is} independently a polyvalent branched or unbranched alkyl, alkenyl, alkynyl, aryl or aralkyl group having 3 to 10 carbon atoms in which c + e - 1 hydrogens have been replaced; each occurrence of X ^{1 is} independently selected from the hydrolyzable group consisting of -OH and -OR ⁶ , wherein R ^{6 is} a monovalent branched or unbranched alkyl or alkenyl group having up to 5 carbon atoms, and -OSi containing groups selected from the group consisting of Condensation of silanols result; each occurrence of X ² and X ^{3 is} independently selected from the group consisting of R ⁶ wherein R ^{6 is} a monovalent branched or unbranched alkyl or alkenyl group of up to 5 carbon atoms; each occurrence of the indices a, b, c, d, e, f, m, n, o, p and x is independently given, where a is 1 to 2; c and e are 1; b is 1 to 3; d is 1 to 3; m and p are 1; n is 1 to 10; o is 0 to 1; and x is 1 to 8. Sulfur-crosslinkable rubber mixture according to claim 1, characterized in that it contains at least one silane with the following structural formula as silane coupling agent

contains, where x = 1 to 8. A sulfur-crosslinkable rubber mixture according to claim 2, characterized in that it contains at least (2-triethoxysilylethyl) bis- (7-triethoxysilyl-3,4,5,6-tetrathianonyl) cyclohexane as silane coupling agent. Sulfur-crosslinkable rubber mixture according to at least one of claims 1 to 3, characterized in that it comprises - 70 to 100 phr (parts by weight, based on 100 parts by weight of the total rubbers in the mixture) of synthetic and / or natural polyisoprene, - up to 30 phr of at least one polybutadiene . From 20 to 100 phr of at least one silica, from 2 to 10 phr of at least one silane coupling agent and an adhesive system. Sulfur-crosslinkable rubber mixture according to claim 4, characterized in that it contains 40 to 80 phr of silica. Sulfur-crosslinkable rubber mixture according to at least one of the preceding claims, characterized in that the adhesive system is a Stahlcordhaftsystem based on organic cobalt salts and reinforcing resins and more than 2.5 phr sulfur. Sulfur-crosslinkable rubber mixture according to at least one of the preceding claims, characterized in that it contains less than 15 phr process aid. Pneumatic vehicle tire having a sulfur-crosslinked rubber composition according to at least one of claims 1 to 7 as a rubber mixture for strength carrier and / or as a mixture for other inner tire components (Bodymischungen). Pneumatic vehicle tire according to claim 8, characterized in that it comprises a belt rubber lining of the sulfur-crosslinked rubber mixture, the belt preferably containing metallic reinforcing members. Pneumatic vehicle tire, in particular commercial vehicle tire, according to claim 8 or 9, characterized in that it comprises a carcass gumming of the sulfur-crosslinked rubber mixture. Pneumatic vehicle tire, in particular commercial vehicle tire, according to at least one of claims 8 to 10, characterized in that it comprises a bead reinforcement of the sulfur-crosslinked rubber mixture. Pneumatic vehicle tire, in particular commercial vehicle tire, according to at least one of claims 8 to 11, characterized in that it comprises a belt edge and / or a tread base plate and / or a bead strip of the sulfur-crosslinked rubber mixture.