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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Silane coupling agent composition for improving dispersion of inorganic fillers like silica in rubber compositions, particularly for tires. The composition contains two specific silane compounds with cyclic hydrocarbon groups, a protein denaturant like urea, and optionally a silanization reaction accelerator like guanidine. This promotes silanization between the silane compounds and filler surfaces, improving filler dispersion and rubber properties.

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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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Rubber composition that improves the heat aging resistance of a resultant vulcanized rubber. The composition includes a vulcanized rubber of the rubber composition, a filler, a vulcanizing agent, a vulcanization accelerator, an antiaging agent, a softener such as wax or oil, a processing aid, and a rubber component.

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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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Method for preparing an aerogel material using nano attapulgite and phenolic aldehyde for improving abrasion resistance and flame retardancy in rubber compounds used in vehicle tires. The aerogel is prepared by crosslinking nano attapulgite and phenolic aldehyde obtained by ring-opening polymerization of a monomer. The aerogel is added to rubber compounds for making tires with enhanced abrasion resistance and flame retardancy compared to conventional rubber compositions.

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Heavy vehicle tire treads with improved wear performance and rolling resistance compared to traditional silica-free tire treads. The treads contain a rubber composition with silica filler, a silane coupling agent, sulfur, and accelerators. The ratios of these components are optimized to maintain modulus properties similar to silica-free treads. The treads have a minimum 8 MPa modulus at 300% elongation. The treads provide better wear performance and rolling resistance compared to traditional heavy vehicle tire treads without silica.

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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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