Air Leak Prevention in Tire Design

Sealant composition for self-sealing pneumatic tires that balances sealing performance and flow suppression. The composition has a specific range of toluene insoluble matter content, between 30-60%, to achieve both sealing effectiveness and flow prevention. The insoluble matter content is measured by immersing the sealant in toluene for a week and measuring the mass of the remaining insoluble material. The composition uses a combination of halogenated and non-halogenated butyl rubbers, with a crosslinking agent and organic peroxide, to crosslink the rubber and prevent excessive flow.

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Sealant composition for self-sealing pneumatic tires that balances sealing performance, flow control, and durability. The composition has a measured specific gravity d1 between 0.7 and 0.9, and a calculated specific gravity d2 of 1.0 or less. The compositions are prepared using an underwater displacement method, and contain at least two types of butyl rubber. The measured and calculated specific gravities are used to optimize sealing performance, flow control, and durability of the sealant layer. The specific gravity ratio balances sealing effectiveness with preventing excessive flow while driving. Using two types of butyl rubber with different vulcanization rates creates variations in hardness in the cured sealant that improves sealing performance.

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Graphene is added to rubber compounds, particularly to the inner liner of tires, to improve air retention properties. This reduces permeability and helps maintain tire pressure. The graphene additive provides impermeability beyond what is achieved with traditional halobutyl rubber liners.

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Sealant composition for tires that improves sealing performance, workability, and contamination resistance compared to existing sealants. The composition contains specific amounts of tackifier and plasticizer in the rubber component. The tackifier improves sealing by filling voids and preventing air leakage when a foreign object penetrates the tire. The plasticizer reduces adhesion over time to prevent sticking to the inner liner. The total compounding amount of tackifier and plasticizer is 60 parts by mass or less per 100 parts of rubber. This reduces initial adhesion and viscosity while maintaining sealing effectiveness.

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Sealant composition for pneumatic tires that provides excellent sealing, rigidity, and reduced rolling resistance compared to conventional sealants. The sealant contains a specific ratio of hydrocarbon resin, liquid plasticizer, and cellulose nanofiber when mixed with the tire rubber. The hydrocarbon resin provides sealing ability, the plasticizer improves flexibility, and the cellulose nanofiber improves adhesion. The sealant composition can be applied to the inner surface of tires to block punctures and seal leaks. Crosslinking agents can be added to further fix the sealant to the tire.

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Pneumatic tires with self-sealing properties to prevent or repair punctures. The tires have a sealant layer and an air barrier layer applied to the cured tire after manufacturing. The sealant layer includes a self-curing butyl rubber composition that can repair punctures. The air barrier layer includes a blend of thermoplastic and elastomeric polymers to reduce air permeation. The layers adhere directly to the tire carcass without an inner liner.

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Building a tire without a separate inner liner, to save costs and weight. Instead of using a separate inner liner rubber, an air barrier material is sprayed on the inner surface of the cured tire after manufacturing. The tire is inflated to shape, then secured and rotated while a spray nozzle applies the air barrier. The spraying can be done using various machines in the tire production process like inflation machines, conveyor sections, or tire trimmers. The sprayed-on air barrier material replaces the inner liner to prevent air loss from the tire.

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Rubber composition for sealants in self-sealing tires that provides good initial sealing performance and resistance to aging deterioration. The composition has a low complex elastic modulus (below 5.00kPa) and contains less than 0.3 parts by mass of oxidizing agent relative to 100 parts of butyl rubber. The low oxidizing agent content prevents accelerated rubber deterioration and sealing failure after aging. The composition can seal punctures in tires and is used in self-sealing tire applications where a sealant is applied to the inner surface to block punctures.

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Pneumatic tire with improved self-sealing performance that maintains sealing ability at high and low temperatures. The tire has an inner liner to maintain air pressure, a sealant layer on the inner surface, and a sound-absorbing material adjacent to the sealant. The sealant layer has two thicknesses - a wider first layer against the liner and a narrower second layer on top. This prevents the sound-absorbing material from degrading the self-sealing ability.

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A self-sealing tire construction and manufacturing method that allows for easy and cost-effective production of puncture-sealing tires with noise reduction. The tire has a foam layer containing a pre-sealant material that breaks down and seals punctures when the tire is vulcanized. The foam layer also reduces road noise. The foam is made by taking advantage of off-gassing during vulcanization that foams the elastomer around the pre-sealant.

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A method of building a tire without an inner liner. The method involves spraying an air barrier material onto the inner surface of the tire after curing. The spraying can be done using automated equipment like an extending nozzle from below the tire. This eliminates the need for a separate inner liner layer and saves cost and weight compared to traditional tires.

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Inflation valve for tubeless tires with stems that have anti-rotation features to improve airflow, allow easy disassembly, and prevent clogging. The valve stem has protrusions that engage slots in the valve body to restrict rotation. This allows the stem to move axially while preventing it from twisting. The valve body has a larger diameter valve seat than the body ID to increase airflow. The valve stem also has components that can be disassembled for cleaning or maintenance.

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Using graphene sheets as an additive in rubber compounds to improve air retention in tires and other rubber products like hoses, seals, gloves, bottles, etc. The graphene reduces the permeability of the rubber, preventing gas or liquid medium from escaping. This helps maintain pressure and prevents the loss of refrigerant gases. By reducing gas permeation in tires, rolling resistance can be reduced. The reduced graphene oxide (rGO) additive provides an ultra-high barrier property to the rubber matrix, making it impermeable.

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Process and system to manufacture high self-sealing tires using an automated, precision process that provides a layer of high molecular organic material on the tire's inner liner. The process includes cleaning the tire, spraying heated self-sealing material on the inner liner, and forced cooling. The cleaning involves soaking, scrubbing, rinsing, rotating, and air drying. The spraying uses an accelerated rotating tire and heated material. The forced cooling uses directed air to rapidly cool the sprayed material.

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Innerliner of a tire that has reduced air permeability by incorporating graphene into the rubber compound. The graphene additive is used in the rubber composition of the inner liner layer of a tire to reduce air permeation which improves tire inflation pressure retention.

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A system for monitoring tire pressure that can accurately detect slow leaks without additional sensors or parameters. The system uses pressure sensors on two tires of an axle and an aggregator that compares the pressure difference between the tires. A noise filter and leak detection module analyzes the aggregated pressure data to determine if a leak is occurring. This allows precise detection of slow leaks that cause a pressure difference between tires.

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A self-inflating tire sealant that prevents slow air leaks and seal punctures without corrosion, damage, or toxicity issues. The sealant contains modified polyurethane resin, polyvinyl alcohol fibers, polyphenylacrylic resin, nano-crystalline cellulose, nano-activated carbon, vinyl acetate, silicic acid gel, antifreeze, antioxidant, surfactant, SBS, isophorone, and solvent. The modified polyurethane resin provides flexibility, weather resistance, heat resistance, and low viscosity. The nanomaterials enhance performance. The sealant can be prepared by a specific method involving controlled heating and stirring.

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Sealant composition for pneumatic tires that balances sealing performance and prevention of sealant flow during tire rotation. The composition contains an organic peroxide and a crosslinking agent, blended with a rubber component containing a chlorinated butyl rubber. The peroxide and crosslinking agent promote sealing by reacting with the rubber. The chlorinated butyl rubber improves reactivity. The blending ratios are from 1-40 parts per 100 parts rubber. This balanced composition ensures sealing while suppressing sealant flow during tire rotation.

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Sealant material composition for self-sealing tires that balances sealing properties, fluidity during running, and storage stability at low temperatures. The composition has specific viscosity ranges at 0, 40, and 80 degrees Celsius: v0 (0°C) < 15 kPa·s, 1 kPa·s < v40 (40°C) < 14 kPa·s, and 0.5 kPa·s < v80 (80°C) < 12 kPa·s. This allows good sealing at low temps, fluidity during running, and storage stability.

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Sealant composition for tires with improved sealing properties and flowability. The composition contains a rubber component, a tackifier with a high softening point (50°C or more), and a plasticizer with a low kinematic viscosity (2500 mm²/s or less) at 40°C. The mass ratio of tackifier to plasticizer is 0.35 or more. This optimized tackifier and plasticizer blend allows the sealant to easily flow into puncture holes while preventing excessive viscosity changes due to temperature or centrifugal force.

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Sealant composition for tires that improves sealing performance, flowability, and storage stability compared to prior art sealant compositions. The composition contains specific amounts of tackifier and plasticizer relative to the rubber component. The amounts are optimized to balance sealing, flow, and storage properties. The sealant has less than 30 parts by mass of tackifier and at least 20 parts by mass of plasticizer per 100 parts of rubber. This configuration allows the sealant to easily flow into tire punctures for sealing, without excessive stickiness or viscosity issues.

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Air sealing effect in a pneumatic tire that can be exerted in a sufficient manner. The air sealing effect is achieved by using a self-healing sealant material arranged on the inner surface of the tire, and in the tire meridional cross section, the tire inner surface is a tread inner surface extending in the tire axial direction and the above.

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Rubber compound for self-sealing tires that provides improved durability and sealing performance compared to existing self-sealing tire compounds. The compound contains specific ratios of first rubber (natural or polyisoprene), second rubber (low Tg solution polymerized styrene-butadiene), fillers, protective agents, active agents, oils, and tackifying resins. This composition balance improves raw rubber strength, adhesion, elasticity, aging resistance, and sealing properties. The compound can be used in self-sealing tire inner liners to delay gas loss and maintain tire pressure after punctures.

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Micro-crosslinked self-healing tire sealant that can repair punctures in tires without needing to stop driving. The sealant contains specific blends of matrix materials, sulfhydryl compounds, softeners, and vulcanizing agents that when mixed and applied internally to tires, can flow into puncture sites and seal them due to the micro-crosslinked structure. The sealant has a high viscosity and strong adhesion to prevent extrusion, and the low molecular weight polyisobutylene components provide crosslinking and tackiness. The micro-crosslinked structure allows the sealant to flow into punctures but not deform the tire.

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Sealant composition for tires that provides good sealing performance while preventing excessive flow of the sealant during tire rotation. The composition contains an organic peroxide, a crosslinking agent, and a specific amount of a non-halogenated butyl rubber. The peroxide catalyzes crosslinking, while the crosslinking agent further enhances crosslinking. The butyl rubber improves sealing properties. The specific blend ratios balance sealing performance, flow control, and oxidation resistance.

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Puncture sealing tire with improved uniformity by using a degradable sealant composition containing polyisobutylene rubber, a peroxide, and a filler. The composition degrades during vulcanization to a tacky sealant that stops air loss from punctures. The low viscosity sealant forms in situ between layers in the tire building process without expansion or bubbling. The peroxide degrades the polyisobutylene at low levels to reduce off-gassing during vulcanization. The filler can be polypropylene or clay.

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Rubber composition for sealant materials in puncture-resistant tires that provides improved sealing and breaking properties compared to conventional sealant materials. The composition contains a resin curing agent like phenol resin, a liquid polymer like polybutene with viscosity 500-6000 cSt, and a low amount of organic peroxide. This allows controlled crosslinking without non-uniform structure. The composition is applied to the inner surface of tires to seal punctures. The tire rotation during application ensures even coating.

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Sealant rubber compositions for self-sealing tires that have improved sealing performance after aging, fracture properties, and reduced changes in fracture properties over time compared to conventional sealants. The compositions contain specific amounts of butyl rubber, zinc oxide, and liquid polymer, with very low levels of traditional accelerators and sulfur. The reduced accelerators and sulfur prevent crosslinking issues like brittle sulfur bridges. The compositions can be applied using a method that precisely adjusts the distance between the tire inner surface and sealant nozzle to ensure consistent coverage.

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Sealant material composition for self-sealing tires that balances sealing performance, flow suppression, and tire durability. The composition has specific viscoelastic properties and additive ratios. It contains chlorobutyl rubber, sulfur as the crosslinker, organic peroxide as the crosslinking aid, and a plasticizer. The rubber has a shear modulus of 5-30 kPa at 20°C, 1-10 kPa at 80°C, and max tan delta 1.0 or less in 20-100°C range. This balance of properties prevents sealant migration, maintains sealing effectiveness, and reduces tire damage from sealant transfer.

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Adhesive sealant material for self-sealing tires that provides good sealing performance in low temperatures, suppresses flow during running, maintains adhesion to the tire, and has consistent properties over time. The sealant has a low initial viscosity at -20°C after vulcanization (V1) of 20 kPa·s or less, and a small viscosity difference (ΔV) between -20°C and 30°C (after storage) of 5 kPa·s or less. The low initial viscosity ensures sealing in cold temps, while the small viscosity difference prevents deterioration. The sealant contains chlorinated, brominated, and non-halogenated butyl rubbers, sulfur as the crosslinker, and a plasticizer. The combination of rubbers with different vulcanization rates improves balance

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Sealant material composition for self-sealing pneumatic tires that balances sealing performance and suppresses sealant flow during tire rotation. The composition contains chlorinated butyl rubber, other halogenated butyl rubber (like brominated butyl rubber), and non-halogenated butyl rubber in combination. This mix of butyl rubbers with different vulcanization rates provides variations in hardness and softness in the cured sealant layer. The cross-linking agent and organic peroxide are blended instead of using just one for appropriate cross-linking that ensures sealing while preventing excessive flow.

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Self-sealing tire sealant that is suitable for tires with higher internal pressures, like 3.5 bar and above. The sealant has optimized viscosity, flow behavior, elasticity, and adhesion properties for sealing punctures in high-pressure tires. It contains specific components like polyolefins, rubbers, crosslinking agents, and fillers in specific ranges. The polyolefin content is 10-30% by weight, the rubber is 35-60%, the crosslinking agent is 1.0-3.0%, and the crosslinking initiator is 1.8-5.0%. The sealant also includes calcined aliphatic resin, binder, and magnetic particles.

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Self-sealing tire with improved sealing properties and resistance to foreign matter adhesion. The tire has a sealant layer on the inner surface and a coating layer on top of it. The coating layer contains a curable composition with a compound having reactive groups and a moisture-curable latent curing agent. The reactive groups react with the sealant layer when moist, forming a bond between the layers. This prevents foreign objects from penetrating the tire and maintains sealing even when the sealant is punctured. The moisture-curable latent curing agent cures when exposed to moisture, providing additional sealing and adhesion properties.

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Sealant material composition for self-sealing tires that provides improved sealing performance in cold temperatures without excessive flow during normal operation. The composition has a complex elastic modulus of 10 kPa or less at 100°C and 1500 kPa or less at 30°C. This composition with lower modulus at lower temperatures improves sealing in cold conditions without excessive flow during normal operation. Using a combination of chlorinated butyl rubber, brominated butyl rubber, and non-halogenated butyl rubber provides a balanced mixture of hard and soft regions in the cured sealant for optimal sealing properties.

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Sealant material composition for self-sealing tires that balances sealing properties with preventing excessive flow during running. The composition has a specific tensile stress at 20% elongation at both 23°C and 80°C. The ratio of these tensile stresses is preferably 2.0 or less, allowing sealing improvement without excessive flow suppression. Using multiple types of butyl rubbers further balances properties by distributing hard and soft regions in the cured sealant.

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Sealant composition for self-sealing tires that balances sealing properties in low temperatures, suppresses sealant flow during running and storage, and has good sealing performance in a wide temperature range. The composition has specific viscosities at 0°C, 40°C, and 80°C within certain ranges: 2-15 kPa·s at 0°C, 1-14 kPa·s at 40°C, and 0.5-12 kPa·s at 80°C. This balanced viscosity profile allows sealing in low temps, flow control during running & storage, and prevents loss of sealing ability at high temps.

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A self-sealing tire composition that fills punctures when a nail penetrates a tire, preventing air loss and further damage. The composition is applied to the inner wall of the tire. When a nail punctures the tire, the composition flows into the gap between the nail and the tire tread. It adheres to the nail and fills the puncture. This seals the tire without leaking air. When the nail is removed, the composition stays attached to the nail and seals the puncture hole. It has good low-temperature sealing ability and retention, avoiding issues like coating buildup inside the tire.

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Sealant composition for self-sealing tires that balances sealing performance and flow prevention. The composition has high adhesion to both tire rubber (0.20 N/mm or more) and metal (0.05 N/mm to 0.15 N/mm) when cured. This allows it to stick well to foreign objects like nails and seal through holes, while also adhering to the tire inner surface to prevent excessive flow during driving.

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Sealant composition for self-sealing tires that provides good sealing performance even in low temperatures. The composition has a specific property of low tensile yield strength or fracture at -20°C. This is achieved by using a combination of chlorinated butyl rubber, brominated butyl rubber, and non-halogenated butyl rubber in the sealant. This mixture of butyl rubbers with different vulcanization rates creates a composite sealant with a softer, more pliable inner portion for better sealing and a harder outer portion for suppression. This balance of properties prevents sealing degradation in low temperatures.

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Self-sealing tire inner liner composition that balances sealing property and prevention of sealant flow during tire rotation. The composition contains a chlorinated butyl rubber along with another butyl rubber like brominated or non-halogenated butyl rubber. The combination of rubbers with different vulcanization rates results in a cured liner with varying hardness. This prevents excessive sealant flow while still allowing it to seal punctures by having a softer section that seals and a harder section that suppresses flow.

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Sealant material composition for self-sealing tires that balances sealing effectiveness and prevention of sealant flow during tire rotation. The composition contains specific amounts of crosslinking agent, organic peroxide, and crosslinking aid when mixed with a butyl rubber. The amounts are 0.1-40 parts by mass of crosslinking agent, 1-40 parts by mass of organic peroxide, and >0 to <1 part by mass of crosslinking aid relative to 100 parts by mass of butyl rubber.

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Sealant composition for tires that provides good sealing performance while preventing excessive sealant flow. The composition contains a crosslinking agent, organic peroxide, liquid polymer, and carbon black. The amounts of crosslinking agent and peroxide are balanced to achieve crosslinking without over-curing. The liquid polymer improves sealant fluidity. Carbon black enhances compliance. The sealant is used in tire inner liners to prevent air loss.

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Sealant material composition for self-sealing tires that balances sealing performance and prevent flow during rotation. The composition contains a rubber component with chlorinated butyl rubber, organic peroxide, and a cross-linking agent. The amounts are 100 parts rubber, 1-40 parts peroxide, and 0.1-40 parts cross-linking agent. This blend provides good sealing properties while also suppressing excessive flow of the sealant during tire rotation.

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Sealant composition for self-sealing tires that balances sealing performance and prevents excessive sealant flow during tire rotation. The composition contains a rubber component with at least 10% non-halogenated butyl rubber. It also includes an organic peroxide and a cross-linking agent in a ratio of 1-40 parts per 100 parts rubber. This composition improves sealing ability while suppressing excessive sealant migration during tire rotation compared to conventional compositions.

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Sealant composition for tires that provides both self-sealing and noise reduction properties. The composition contains a butyl rubber, polybutene, and a foaming agent. The foaming agent allows the sealant to expand and fill gaps when a tire is punctured, preventing air leakage. The polybutene provides noise reduction by absorbing vibrations and dampening sound. The composition is applied internally to tires to seal punctures and reduce noise compared to traditional sealants.

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Tire with built-in puncture sealant formed during cure by chain cessation of a butyl ionomer-based rubber precursor catalyzed by peroxide. The sealant is assembled inside the tire before curing and degrades into a low molecular weight, easily flowing sealant during vulcanization. This avoids the need for annular sealant application after curing and provides better bonding and puncture protection compared to post-cure sealant. The precursor layer is sandwiched between the tire carcass and innerliner.

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Pneumatic vehicle tire with a self-sealing sealant in the inner cavity that adheres well to the inner surface of the tire but still maintains good flowability for reliable sealing. The inner surface of the tire has regions with reduced adhesion, like near the bead, to prevent the sealant from sticking too tightly. This allows the sealant to flow freely when punctured to seal the tire. A sound absorber like a foam ring can be placed on the sealant without affecting flow since it adheres to the reduced adhesion areas. The sealant also has tackiness to adhere to the inner surface. Removing the adhesion reducer from the inner surface is avoided since it can affect sealing performance.

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A vehicle tire with improved puncture sealing capability by adding a closed cell foam ring on the inner surface of the tire. The ring is adhesively bonded to the sealant already on the inner surface. The foam ring provides additional sealing in case the sealant flow properties are degraded by foreign objects. The ring prevents air leakage through larger punctures. It covers the sealant in areas where flow is not affected, while allowing flow in other areas. This ensures reliable sealing even if the sealant is compromised. The ring thickness is less than 50mm, and covered by a thin film.

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Self-sealing tire compounds that provide improved adhesion and cohesion properties compared to conventional tire sealing compounds. The compounds have a specific crosslinked butyl rubber with a Mooney viscosity of at least 30 and a gel content of at least 5 wt%. The high viscosity and gel content of the crosslinked butyl rubber provide better sealing and resistance to penetrating objects in tires compared to conventional butyl rubbers.

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Pneumatic tire with a cured sealant layer that provides long-term sealing against punctures without bubbling or migration issues. The sealant is mixed into the tire during curing instead of being applied post-cure. The sealant composition contains an elastomer, filler, diluent, quinone curing agent, oxidizing co-curing agent, and a specific activator. The oxidizing co-curing agent allows the sealant to cure during tire manufacturing without generating gas or bubbles. This avoids issues like aesthetics, migration, and loss of integrity compared to liquid sealants.

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