Tire Life Extension Methods

A new compound, N-(1,3-dimethylbutyl)-9H-carbazol-3-amine, that can be used as an aging stabilizer in vehicle tires and technical rubber articles. The compound provides improved protection against oxidation and ozone degradation compared to traditional aging stabilizers like aromatic amines. It has lower hazard potential compared to aromatic amines while still providing solubility in the rubber matrix. The compound can be synthesized by starting with 3-aminocarbazole and reacting it with 1,3-dimethylbutyl chloride.

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Statistical copolymers containing vinylbenzocyclobutane (VBCB) monomer units for improved crosslinking in rubber compositions like tire treads. The copolymers have a statistical distribution of conjugated diene and VBCB monomers along the chain. This improves crosslinking density and distribution when cured compared to copolymers without statistical distribution. The copolymers are made by anionic polymerization with an initiator and randomizing component. The VBCB monomer forms crosslinks with both itself and the polymer backbone. The statistical distribution disperses VBCB units throughout the chain versus clustering or alternating.

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A passenger vehicle tire with reduced chunking and improved aerodynamics. The tire has hybrid transverse cuts in the lateral portions that prevent chunking by avoiding penetration of the interface between the tread and inner layer. The narrow inner portion has width 0.2-0.6mm, the wider outer portion has width 0.7-5mm, both radially outside the interface. This prevents penetration that moves the inner layer outward, causing chunking when the tire wears. The cuts have bottoms all outside the interface. The wider outer portion reduces chunking by radially inward movement during molding. The cuts also have smooth bottom transitions to reduce aerodynamic drag compared to abrupt indentations.

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Embedding split ring resonators in vehicle components like tires, bodywork, and landing pads to monitor deformation, wear, and environmental conditions. The resonators, made of 3D carbon growth, can be tuned to resonate at specific frequencies based on material properties. By pinging the resonators with RF signals and analyzing the return signals, changes in frequency indicate deformation, wear, or environmental effects. This allows non-destructive sensing of tire ply degradation, tire wear, and landing pad conditions.

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Polypropylene composition with improved thermo-oxidative aging resistance for carbon black colored materials. The composition has specific carbon black properties to balance oxidation resistance and antioxidant consumption. It contains carbon black with a surface oxygen content of 1.74-3.45% by weight, along with the standard components of polypropylene and antioxidants. The optimized carbon black reduces free radical generation and antioxidant consumption compared to unmodified carbon black.

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Rubber composition with improved crack resistance after thermal degradation for applications like tires and seismic isolation. It uses a unique double network structure formed by crosslinking syndiotactic 1,2-polybutadiene (sPB) in the rubber matrix. The sPB crystals and dissolved sPB/rubber segments form a network that provides energy dissipation and flexibility for crack resistance. Crosslinking is done at temperatures above sPB melting point to partially dissolve sPB and fix it in the rubber.

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Determining tire degradation state using color change of an indicator attached to the tire. The method involves extracting color components from an image of the indicator, looking up the color change in a database associated with degradation factors, and using a degradation model to determine tire state based on the color change. This provides an objective and precise measurement of tire degradation that can be used to propose appropriate retreading options.

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Rubber composition for new energy vehicle tires that provides improved wear resistance, lower rolling resistance, and better grip on icy and snowy roads compared to conventional tire rubber compositions. The composition contains specific amounts of trans-polyoctene, carbon black, white carbon black, and a carbon black coupling agent called amino polysulfide. The trans-polyoctene and coupling agent enhance carbon black dispersion and interaction with the rubber matrix, which improves wear resistance. The composition also reduces rolling resistance due to the trans-polyoctene and has better grip on slippery surfaces due to the white carbon black.

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A rubber composition for tires that reduces heat generation and prevents tearing when dismounting wheels. The composition contains carbon black with low specific surface area, a low sulfur vulcanization system, and a specific multifunctional crosslinking agent. The low surface area carbon black reduces heat compared to high surface area carbon black. The low sulfur vulcanization prevents aging tears. The multifunctional crosslinking agent provides stable bonds with good heat resistance and aging properties. This allows reducing heat generation by 40% compared to conventional compositions while preventing tire tearing during wheel removal.

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Rubber composition for tire treads containing low-cis polybutadiene rubber and tires manufactured using the same. The composition replaces high cis butadiene rubber in tire treads with low cis butadiene rubber to improve fuel efficiency, wear resistance, and processability compared to high cis rubber. The low cis butadiene rubber has specific molecular weight, molecular weight distribution, and cis content ranges. Adding silane coupling agents further enhances silica dispersion in the compound.

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Tread rubber composition for all-steel radial tires that provides improved cutting resistance and low rolling resistance compared to conventional rubber compounds. The composition contains modified composite rubber, dispersible white carbon black, carbon black, reinforcing agent, zinc oxide, accelerator, sulfur, antioxidant, anti-scorch agent, peptizer, microcrystalline wax, xanthan gum, and quaternized fatty amide glycine. The specific ratios of these components provide enhanced cutting resistance, wear resistance, and low rolling resistance.

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Engineering tire tread rubber composition for improved heat dissipation, durability, and cutting resistance in heavy-duty tires. The composition contains specific additives like low heat generating agents, heat dissipation fillers, and anti-cutting agents, along with conventional rubber components like styrene-butadiene rubber, natural rubber, carbon black, silica, and sulfur. The additives optimize the tread performance in harsh environments where heat buildup is a concern. The low heat generating agents reduce internal heat generation. The heat dissipation fillers improve thermal conductivity. The anti-cutting agents prevent chipping. This composition allows thicker, deeper treads with better heat dissipation and resistance to cutting and chipping without sacrificing tire life.

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Tire tread design with sipes that maintain performance as the tire wears. The tread has sipes with three different depths, forming three levels in the tread blocks. The shallowest sipes are at the top level and the deepest sipes are at the bottom level. This allows the sipes to maintain their biting edges and void volume as the tread wears down, improving wet and snow traction over the life of the tire. The staggered depth levels also prevent damage or tearing when the mold is removed from the tread during manufacturing.

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Pneumatic tire with a steel-reinforced carcass that improves durability and running performance. The tire has a unique carcass design that eliminates the need for additional reinforcement members to maintain the carcass turn-up. The carcass extends from the bead up and around the apex that absorbs impacts. The key is that one end of the carcass is closer to the bead than the other end is to the apex. This maintains the turn-up height without additional components, reducing weight and rolling resistance while still preventing the carcass from loosening.

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Heavy-duty tire design and manufacturing to improve bead durability without increasing rolling resistance. The tire has a unique carcass contour and molding process. The carcass contour has an outwardly bulging curved portion connected to an inwardly recessed inversely curved portion. This shape is represented by two tangent arcs. The ratio of distances from the tire equator and bead base to the arcs' inflection point falls within specific ranges. The molding process uses a clip width slightly larger than the rim width to apply pressure evenly during vulcanization.

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Tire construction for a motorcycle tire that provides improved turning performance and durability compared to conventional motorcycle tires. The tire has a tread reinforcing layer with specific belt and band ply orientations and widths. The inner belt ply has cords angled greater than 5 degrees to the tire circumferential direction. The outer belt ply has cords angled greater than 5 degrees but with a wider width than the inner belt ply. The band ply has cords angled less than or equal to 5 degrees. This combination of belt and band ply angles and widths optimizes cornering force distribution and reduces tire wear for improved turning performance and durability.

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Carcass rubber composition for tires that reduces rolling resistance without using styrene-butadiene rubber. The composition uses modified low cis-polybutadiene rubber along with natural rubber. This improves carbon black dispersion, reduces heat generation, and maintains physical properties and adhesion compared to traditional compositions containing styrene-butadiene rubber. The mixing method involves combining the components in specific proportions.

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Pneumatic tire design that reduces rolling resistance and improves fuel efficiency without sacrificing durability. The tire has a bead-reinforcing layer outside the carcass that reinforces the bead portion. The tire also has specific geometric and material properties like loss tangent, complex elastic modulus, groove ratios, and sidewall characteristics.

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Producing a motor vehicle tire with improved bonding between textile cords and surrounding rubber to enhance tire durability. The method involves dipping the cords in a bath containing polyisocyanates to activate the bonding, instead of using resorcinol-formaldehyde dips. The cords are then coated with a rubber compound containing specific rubber types and carbon blacks. This avoids toxic and environmentally harmful resorcinol-formaldehyde dips while still providing adequate bonding.

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A pneumatic tire that exhibits excellent grip performance and durability during high-speed running, and also improved fuel efficiency. The tire achieves this by having tread regions with different thermal conductivities. These regions are made of rubber compositions with high and low thermal conductivity. The high thermal conductivity composition dissipates heat generated during high-speed running, preventing overheating and maintaining grip. The low thermal conductivity composition retains heat and provides durability.

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