Accelerators for Tire Vulcanization

RFID tag coating rubber composition for tires that balances communication performance, crack resistance, adhesion, and elastic modulus. The composition contains a rubber component, sulfur, silica, and a guanidine-based vulcanization accelerator. The sulfur is mainly insoluble and has a high content of 6.0 parts by mass per 100 parts rubber. The insoluble sulfur improves elastic modulus without blooming or tackiness issues. The guanidine accelerator prevents modulus loss and vulcanization decay.

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Cobalt-free steel cord-rubber composite for tire reinforcement that eliminates the need for cobalt additives in rubber compounds. The composite has a steel cord core coated with a copper-iron-zinc layer, and a cobalt-free rubber adhesion layer. The copper-iron-zinc coating promotes adhesion between the cord and rubber without cobalt. The cobalt-free rubber compound uses alternative ingredients like zinc oxide and accelerators instead of cobalt salts for vulcanization.

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Rubber compositions for tire treads containing organosilyl polysulfides as reinforcing additives. The organosilyl polysulfides have a specific structure with silyl groups and sulfur atoms. They provide improved reinforcement compared to traditional silica fillers. The compositions also contain rubber, fillers like silica and carbon black, and vulcanization accelerators. The organosilyl polysulfides can replace diphenylguanidine (DPG) as secondary accelerators for better vulcanization control. The compositions can have reduced DPG levels or be DPG-free.

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Reinforcing additives for rubber compositions like tires that replace conventional accelerators like diphenylguanidine (DPG) to improve tire performance and reduce health concerns. The additives are organosilyl polysulfides with formula (I): [R1]3Si-[x]-Sx, where R1 is an organic group and x is the number of sulfur atoms (3.6-4.4). The polysulfides provide reinforcement without releasing aniline during vulcanization like DPG does. The rubber compositions containing the polysulfides can have improved properties like hardness, tear strength, and processability.

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Rubber composition for tires and other rubber articles containing recycled crumb rubber, along with a specific copolymer, filler, and curing system. The composition has improved fatigue resistance compared to traditional rubber compounds when using crumb rubber at low loadings. The copolymer is ethylene-1,3-diene based with high ethylene content. The curing system has specific accelerators. The composition allows using crumb rubber at loadings as low as 0.1% without sacrificing performance.

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A heavy load tire compound that provides improved resistance to abrasion and hot tearing compared to conventional rubber formulations for heavy load tires. The compound uses a tripolymer blend of diene elastomers with high cis content: a lanthanide series catalyzed polybutadiene, a nickel catalyzed polybutadiene, and a synthetic cis-1,4 polyisoprene. The compound also includes a balance of carbon black and silica fillers, accelerators, and a vegetable oil processing aid.

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Rubber composition that is abrasion resistance and has excellent breaking strength. The composition includes a sulfur-containing polymer as a rubber component, a vulcanization agent, and a vulcanization accelerator.

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Rubber composition for non-pneumatic tire spokes that provides ozone resistance and adhesion to cords without compromising fatigue and tear strength. The composition contains ethylene-propylene-diene terpolymer (EPDM) rubber along with a lower amount of another elastomer like natural rubber or polyisoprene. This balance improves ozone resistance while maintaining properties like adhesion and tear strength. The composition also includes reinforcing fillers like carbon black and silica for improved tear strength and degradation resistance. The curative system includes vulcanizing agents, accelerators, activators, inhibitors, and anti-scorching agents for curing the rubber.

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Rubber-steel cord composite capable of providing excellent initial adhesiveness, adhesiveness after aging, and adhesiveness after storage. The composite includes a rubber composition, a steel cord, and a vulcanization accelerator having little influence on an environment.

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Sillane coupling agent composition that can be used as a component of a silane coupling agent in order to improve the dispersibility of an organic polymer material such as rubber and an inorganic material such as silica in a rubber composition. The composition includes a silane compound having a reactive functional group and a hydrolyzable group, a protein denaturant and/or a silanization reaction accelerator, and a crosslinked product of the rubber composition and a tire using the rubber composition.

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Preparing a rubber composition that may improve the traction characteristics and rolling resistance when applied in tire components. The composition includes a silica filler, a silica coupling agent, and a vulcanization accelerator.

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Rubber composition for tires with improved snow traction by adding a vulcanization accelerator during the initial mixing step. This improves silanization of the silica filler with the rubber, especially for compositions with low glass transition temperatures (-55°C or less). Adding the accelerator during the initial mixing step catalyzes the silanization reaction between the silica coupling agent and the rubber.

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Run-flat tire with improved run-flat durability. The tire has vulcanized rubber containing a rubber component and a vulcanization accelerator containing tetrabenzylthiuramdisulfide. The rubber component forms a network structure with 65% or more monosulfide and disulfide bonds. This structure allows the tire to support the vehicle and continue running after puncture without deflation. The vulcanization accelerator composition improves the network strength and reduces heat generation during run-flat operation.

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Rubber composition for run-flat tires that provides high temperature softening resistance for improved durability. The composition contains a rubber component, filler, vulcanizing agent, and a vulcanization accelerator containing tetrabenzylthiuramdisulfide and a sulfenamide-based vulcanization accelerator. The ratio of tetrabenzylthiuramdisulfide to sulfenamide-based accelerator is 0.60 to 1.25. This composition balances the vulcanization accelerators to enhance softening resistance at high temperatures while maintaining vulcanization properties.

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Triazinane derivatives with three aminecarbotrithioate end-groups that act as both cross-linking agents and vulcanization accelerators in rubber compounds. These triazinane compounds, like (1,3,5-triazinane-1,3,5-triyl)tris(propane-3,1-diyl) tris(dibenzylcarbamo(dithioperoxo)thioate), have dual effects during rubber vulcanization: they cross-link the rubber matrix by splitting their disulfide bonds, and they accelerate vulcanization by generating dithiocarbamate radicals. The compounds can be synthesized by reacting triazinane compounds with dithiocarbamate salts in water.

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Rubber compositions and tires with reduced change in complex modulus over time. The compositions contain a specific copolymer made by anionic polymerization of an aromatic vinyl compound and a conjugated diene compound. The copolymer has a certain degree of hydrogenation in the conjugated diene section and a styrene content. The compositions also have specific combinations of softeners, fillers, accelerators, and other additives. Heat aging the compositions at 90°C for 336 hours mimics tire aging. Rubbers meeting certain parameters for complex modulus change during heat aging have reduced modulus change after 50,000 km tire use.

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Low-odor, environmental friendly rubber mixture for tires that reduces tire odor during manufacturing, storage, and use. The mixture contains specific accelerants, fillers, vulcanizing agents, and other components to minimize volatile organic compounds (VOCs) and odor-causing substances. The accelerants have multiple sulfur/nitrogen/phosphorus bonds instead of single bonds that decompose into pungent odors. The fillers are selected to reduce odor. The vulcanizing agents are chosen to minimize VOCs. This improves tire odor during production, storage, and use compared to conventional tires.

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Elastomeric compositions for tire compounds that improve the cross-linking of phenolic resins in tire rubber without negatively impacting sulfur vulcanization. The compositions contain oxidized carbon allotropes like oxidized graphene, oxidized carbon nanotubes, or oxidized graphite. These oxidized carbon materials act as cross-linking accelerants for phenolic resins like aldehydes and methylene donors. The acceleration allows complete cross-linking of the phenolic resins during vulcanization without prolonging the process or reducing sulfur vulcanization. The compositions can be used in tire components like bead fillers, base layers, and anti-abrasion layers to improve tire properties.

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Pneumatic tire with improved heat aging resistance and crack growth resistance of the belt pad while reducing the use of raw materials that can have environmental impacts. The tire uses a rubber composition for the belt pad that contains a specific vulcanization accelerator (N,N-dibenzylbenzothiazole-2-sulfenamide) and additional compounds (1,6-bis(N,N-dibenzylthiocarbamoyldithio)hexane and hexamethylene bis-thiosulfate disodium salt dihydrate) to significantly improve heat aging and crack growth resistance compared to traditional compositions. This allows the belt pad to maintain rigidity and prevent failure even after aging and repetitive loading, without needing cobalt compounds that have environmental concerns.

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Rubber composition for tires that has improved properties like cohesion and vulcanization without compromises. The composition uses a highly saturated diene elastomer like ethylene-propylene-diene rubber (EPDM) with high ethylene content. This elastomer vulcanizes slowly due to low diene content, so the composition has optimized sulfur and accelerator ratios to cure faster. The sulfur content is less than 0.95 phr and the secondary accelerator ratio is less than 0.7. This balance reduces press times and bubble formation while maintaining cohesion. The composition also contains carbon black filler and can be used in heavy load tire treads.

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A rubber composition with improved cure characteristics and scorch safety for manufacturing rubber articles like tires. The composition uses a specific accelerator with a unique structure to balance cure rate and scorch resistance. The accelerator is an organosilicon compound with a sulfur-containing pendent group and a long alkyl chain. It is used in combination with a sulfur-based silica coupling agent. The accelerator provides fast cure rate without premature vulcanization, enabling shorter manufacturing times. The coupling agent improves silica reinforcement. The composition can be used to make rubber products like tires with better processing efficiency and physical properties.

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Rubber composition for coating steel cords in tires that improves durability. The composition contains a resorcinol resin, filler, vulcanization agents, accelerator, and a heat-resistant crosslinking agent. The key is limiting the cobalt salt content to 0.1 parts per 100 parts rubber. This reduces odor from the resorcinol resin while maintaining reinforcement and peeling resistance between the rubber and steel cords.

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Side reinforcing rubber composition for run flat tires that improves run flat durability. The composition contains a rubber component, a filler with specific carbon blacks, a vulcanizing agent, and a vulcanization accelerator. The filler has a carbon black with low surface area (20-60 m2/g) and a carbon black with high surface area (100-150 m2/g) in a ratio of 2.7-10. This combination of small and large carbon blacks enhances the network between the rubber and filler, leading to better run flat performance.

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Rubber composition for tires that provides high stiffness without increasing filler content. The composition contains diene elastomers, reinforcing filler, reinforcing resin, and a vulcanization ultra-accelerator with short initiation time. The accelerator increases stiffness by improving the cure rate without needing higher sulfur or accelerator levels. The accelerator has a vulcanization initiation time less than 3 minutes. The composition also avoids accelerators with long initiation times over 3 minutes.

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Reinforced products for rubber articles like tires that have a simpler, more processable rubber coating on the reinforcing thread. The coating composition has a fast vulcanization accelerator with a short initiation time, less than 3.5 minutes, to enable faster curing. The accelerator is a compound like N-cyclohexyl-2-benzothiazolesulphenamide. The coating also has lower sulfur and filler ratios compared to conventional coatings. This simplified coating composition makes reinforced products easier to manufacture with better processability and reduces costs.

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A tire that has both low heat build-up and improved fracture resistance compared to conventional tires. The tire contains a rubber composition with less than 20 parts silica per 100 parts rubber, along with thiuram-based and sulfenamide-based accelerators and a resin. Reducing silica content improves low heat build-up, while the accelerators and resin improve tear resistance. The tire has a minimum center gauge of 50 mm.

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Tire with improved run flat durability, side cut resistance and steering stability. The tire has a side reinforcing rubber layer and bead filler made from a specific rubber composition. The composition contains a modified conjugated diene based polymer with specific properties. It also has specific ratios of vulcanization accelerators and a small amount of thermosetting resin. This composition allows the side reinforcing rubber layer and bead filler to have desired properties for improved run flat durability and side cut resistance, without compromising steering stability.

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Rubber composition for tires that improves abrasion resistance without sacrificing vulcanization rate. The composition contains a hydrogenated aromatic vinyl-conjugated diene copolymer with high hydrogenation ratio (80 mol% or more) and molecular weight of 300,000 or more. It also has 0.3 to 3 parts of a thiuram accelerator. The high hydrogenated copolymer provides abrasion resistance while the thiuram accelerator maintains vulcanization rate.

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Rubber composition and tire with improved abrasion resistance by optimizing the distribution of vulcanization accelerators during compounding. The composition contains a sulfur atom-containing accelerator that disperses better in the rubber before adding fillers. This reduces adsorption of the accelerator onto fillers, allowing more uniform crosslinking during vulcanization. The dispersed accelerator is combined with a separate non-sulfur releasing accelerator. This prevents excessive crosslinking during kneading. The composition also contains zinc oxide as a catalyst carrier. The dispersed accelerators and filler-kneaded rubber are mixed with sulfur. This provides more uniform crosslink density and better abrasion resistance.

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Preparing a rubber composition for tires that prevents burning during extrusion and improves abrasion resistance by using specific amounts of sulfur and accelerator, limiting carbon black absorption, and controlling extrusion speed. The method involves kneading a specific range of styrene-butadiene and butadiene rubbers with high oil-absorption carbon black. Then, adding less sulfur and accelerator, and extruding at a low speed to prevent burning. This allows using high-reinforcement carbon black for better abrasion without excessive heat generation during extrusion.

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Sulfur-crosslinkable rubber mixtures for vehicle tire treads that balance wet grip, rolling resistance, and winter properties. The mixture contains diene rubbers, silica, a liquid organosilicon-modified polybutadiene, hydrocarbon resin, and accelerators. The organosilicon-modified polybutadiene improves wet grip and winter properties compared to regular polybutadiene. The hydrocarbon resin enhances rolling resistance. The accelerators are added in separate stages to optimize curing behavior.

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Process for producing low heat generation rubber compositions containing silica filler by optimizing the reaction of the silane coupling agent with the rubber and filler. The process involves kneading stages where the silane coupling agent, rubber, and filler are added separately before adding the vulcanization accelerators. This improves the coupling reaction between the silane and rubber before vulcanization. The stages are: (X) initial knead with silane, rubber, and filler; (Y) intermediate knead after X with accelerators; (Z) final knead with vulcanization agents. This sequence enables better coupling of the silane to the rubber during vulcanization, leading to lower heat generation during tire rolling.

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Rubber compounds with reduced diphenylguanidine accelerator content for tire applications that have improved processing and reduced organic amine emissions compared to conventional diphenylguanidine-based compounds. The key is replacing some or all of the diphenylguanidine with polyethylenimine, a basic organic compound. This allows adjustment of vulcanization behavior and properties like Mooney viscosity without the disadvantages of diphenylguanidine like higher scorch times and reversion. The polyethylenimine concentration is typically 0.01 to 10 phr. The compounds can be used for tire treads, sidewalls, and other rubber products.

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Automated tire with ribbed treads that can be used for bus and truck tires, including a polybutadiene rubber rich rubber composition that promotes resistance to tread wear (resistance to abrasion) and, further, to provide a significant level of rubber reinforcing carbon black content to promote increased stiffness. The composition includes a cis 1,4-polybutadiene rubber blended with various ingredients including curatives such as sulfur and cure accelerators.

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Reinforced products like tire belts with improved adhesion between the reinforcing threads and rubber matrix. The reinforcement threads are covered in a thermoplastic polymer sheath and embedded in a rubber composition. The rubber composition uses a fast vulcanization accelerator with a short initiation time of less than 3.5 minutes. This simplifies the mixture and reduces cost compared to traditional vulcanization systems. The fast accelerator improves adhesion between the thread and rubber without compromising other properties.

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Rubber composition for tire treads with improved properties like rheology and green strength compared to conventional vulcanization systems. The composition uses specific thiazole compounds as accelerators instead of traditional benzothiazole accelerators like MBTS. The thiazole accelerators, like compounds F, B, and E with structures like 2-(1,3-benzothiazol-2-ylthio)-1,3-benzothiazole, are incorporated into the rubber mix along with elastomers, fillers, and other components. The thiazole accelerators provide similar vulcanization performance to benzothiazole accelerators but enable better rheometric properties like lower induction time and faster cure speed.

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Polymer with pendant associative groups along its chain that improves dispersion of fillers in compositions like tire rubber. The polymer has units derived from butadiene and styrene, as well as pendant subunits grafted onto some of the backbone units. The grafted subunits contain associative groups like imidazolidinyl, triazolyl, triazinyl, ureido-pyrimidyl, or nitrogen-containing dipoles. These associative groups promote interaction between the polymer and fillers like carbon black or silica to improve filler dispersion and reduce hysteresis when the polymer is used in compositions. The polymer is made by grafting the modifying agent containing the associative groups and reactive group onto a diene polymer like SBR.

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Rubber composition for improved vulcanization rates with a novel vulcanization aid compound. The rubber composition contains the compound (W) with one or more groups represented by formula (X): -Z1-N-X1-X2-X3-X4- where X1 is hydrogen, X2 is hydroxyl, X3 is an aromatic ring, and X4 is a heteroaromatic ring. The compound (W) improves vulcanization rates of rubber components in compositions like tires, belts, and vibration isolators. It provides faster vulcanization kinetics without reversion issues. The compound (W) can be used as an alternative to traditional accelerators like zinc oxide.

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Rubber composition for tires with improved wet grip, wear resistance, and processability. The composition contains silica, a sulfur-containing silane coupling agent, and a thiuram disulfide vulcanization accelerator. The silane coupling agent improves wet grip and wear resistance, the thiuram accelerator speeds vulcanization, and the optimized ratios balance scorch time and vulcanization rate. This provides tires with enhanced wet performance, wear resistance, and processability compared to conventional silane coupling agents.

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Rubber composition for tire manufacture that uses thiazoline compounds as vulcanization accelerators instead of traditional accelerators like sulphenamides. The composition contains diene elastomers, reinforcing fillers, and a thiazoline-based vulcanization system. The thiazoline accelerators improve rheometric properties compared to conventional accelerators. The composition can have improved green strength, processability, and cure kinetics.

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Process for producing a rubber composition with improved low-heat generation and abrasion resistance by optimizing the kneading step sequence and energy levels when adding filler, silane coupling agent, and vulcanization accelerator. The process involves kneading the rubber, filler, silane, and accelerator together in the first stage with specific energy of 0.05-1.50 kWh/kg. This improves the silane's coupling activity. The accelerator is added later, then the vulcanizing agent in the final stage. This prevents reduction of silane coupling by the accelerator.

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Rubber compound for tire treads that improves handling, wet grip, and rolling resistance. The compound contains a specific type of silane coupling agent for silica filler. The silane has an organic spacer group connecting the silicon and sulfur atoms. The spacer can have phenyl rings and alkyl chains. This modified silane improves properties like stiffness, tear strength, and processability. The compound also has a vulcanization system with multiple accelerators. The compound and tire made from it have better handling, wet grip, and rolling resistance compared to conventional tire compounds.

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Rubber composition for tires with improved wet grip and wear resistance while maintaining processability. The composition contains silica, a specific sulfur-containing silane coupling agent, and a thiuram disulfide vulcanization accelerator in specific ranges. The sulfur-containing silane coupling agent improves wet grip and wear resistance, the thiuram disulfide vulcanization accelerator enhances vulcanization rate, and optimized amounts balance scorch time and acceleration.

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Rubber composition for tires that improves rheometric properties and vulcanization performance compared to conventional accelerators. The composition uses a specific thiadiazole compound as the vulcanization accelerator. It also contains diene elastomers, reinforcing fillers, and a vulcanization system. The thiadiazole compound has a formula with a thiadiazole ring and a substituent like an amine. The composition can be used in tire manufacturing to provide similar rheometric properties to conventional accelerators while improving vulcanization performance.

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Rubber composition for tires with improved properties like tensile strength, elongation, low heat build-up, and wet grip without sacrificing workability. The composition contains carbon black and/or inorganic filler, a sulfur-containing compounding agent, and a tin oxide compound. The tin oxide accelerates the chemical reactions between sulfur, vulcanization accelerators, silica, and rubber to balance tire properties.

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Rubber composition for tires that balances abrasion resistance, heat aging resistance, processability, and fuel economy. The composition contains a rubber, silica, silane coupling agent, sulfur vulcanizing agent, sulfenamide or thiazole accelerator, and thiuram accelerator. The specific ratios of these components provide improved tire performance compared to conventional rubber compounds. The sulfenamide/thiazole accelerator combination along with reduced sulfur improves abrasion and aging resistance. The thiuram accelerator boosts strength without decreasing elongation. The optimization of these accelerators balances properties like fuel economy and processability.

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A method to produce rubber compounds for tires that improves processing and wear resistance without compromising rolling resistance. The method involves adding accelerants and zinc fatty acid salts in the first mixing step where the base polymer, silica, and silane bonding agent are mixed. This allows using trialkoxymercaptoalkyl-silanes to reinforce the rubber without viscosity issues. The accelerants and zinc salts aid processing and wear resistance. In the second mixing step, the curing system is added.

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Preparing rubber compositions with improved filler-polymer interaction by in situ functionalization of the elastomer with organoaminoalkoxysilanes during mixing with fillers like precipitated silica. This involves reacting the elastomer with alkoxysilanes containing amino groups in the absence of primary/secondary amines to form elastomer-filler bonds. This improves filler dispersion and rubber reinforcement compared to traditional methods. The in situ functionalization allows tuning filler-polymer interaction without modifying the filler surface or adding extra compounds. The functionalized elastomer compositions can be used in tires, for example.

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Rubber composition for tires with improved wet grip and low rolling resistance without sacrificing processability. The composition contains carbon black and/or silica filler, a sulfur-containing compounding agent, and a boron-containing compounding agent. The boron compound accelerates the crosslinking reaction between the sulfur and rubber. This balances properties like tensile strength, elongation, modulus, and low temperature performance without diminishing workability.

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A method and apparatus for making custom tire components like apexes at the tire building machine itself, reducing the need for pre-mixing rubber compounds. The system allows blending of multiple compounds with different properties at the tire machine to create customized compounds on demand. It provides continuous mixing and control over ratios, accelerators, and other additives. This reduces the number of compounds needed, lowers costs, and enables more complex tire designs.

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