The present invention relates to a rubber composition which makes it possible to achieve both of a riding comfort during normal running and durability during run flat running in a run flat tire. The rubber composition is a rubber composition containing a rubber component, a filler, a vulcanizing agent, and a vulcanization accelerator, wherein the rubber component contains 50% by mass or more of a modified conjugated diene-based rubber; the filler contains a carbon black; and the vulcanization accelerator contains a thiuram-based vulcanization accelerator, the carbon black being contained in an amount of 40 to 60 parts by mass, and the thiuram-based vulcanization accelerator being contained in an amount of 2.6 to 5.5 parts by mass based on 100 parts by mass of the rubber component.

Microbeads are described, comprising silica fibres with needle-shaped morphology of nanometric size, characterised by reduced dustiness and good dispersibility in elastomeric materials, a process for the preparation thereof and the use thereof in the production of vehicle tyres.

The invention relates to a tyre (100) for vehicle wheels comprising at least one structural element comprising a vulcanized elastomeric material obtained by vulcanizing a vulcanizable elastomeric composition comprising at least one vulcanizable diene elastomeric polymer and at least one composite reinforcing filler, a process for producing a tyre (100) comprising the composite reinforcing filler, a masterbatch comprising the composite reinforcing filler and a process for producing the same, as well as a process for producing the composite reinforcing filler.

The present invention relates to a tyre for vehicle wheels comprising at least one structural element comprising a crosslinked elastomeric material obtained by crosslinking a crosslinkable elastomeric composition comprising a predispersion of natural rubber and lignin obtained by co-precipitation from latex, where said lignin has a concentration of phenolic groups higher than 2 mmol per gram of lignin, and where said predispersion comprises an amount of said lignin such as to provide, in said crosslinkable elastomeric composition, a concentration of lignin equal to or lower than about 25 phr.

Metallated aminosilane compounds for use as functional initiators in anionic polymerizations and processes for producing an aminosilane-functionalized polymer using the metallated aminosilane compounds to initiate anionic polymerization of at least one type of anionically polymerizable monomer. Preferred use of the metallated aminosilane compounds results in rubber compositions for use in tires comprising an aminosilane functionalized polymer.

The present disclosure relates to a four-proofing safety tire including a conductive tread rubber layer, a supporting rubber layer, a tire explosion-proof rubber layer and a memory chip, wherein the conductive tread rubber layer can be formed by embedding, in the tread, a belt of narrow conductive rubber penetrated all the way to the inner cap ply or can be formed by adding carbon nanotubes or graphene conductive metamaterial to the tread formulation; the supporting rubber layer is a layer of rubber affixed on the inner wall of the sidewall when the tire is molded, which has a cross section with the shape of half slice of a willow leaf; the tire explosion-proof rubber layer is an explosion-proof layer added on the outer side of the inner liner provided on the inside of the ground-engaging tread of the tire; the memory chip is a special chip structure implanted in the sidewall portion of the tire without affecting the performance of the tire. The anti-static effect of the conductive tread formulation for the tread is excellent; the chip implantation technology can make it possible to trace the product information at any time; a layer of highly stable and highly viscous fluid coating inside the tire prevents air leakage; the support rubber is provided on the inner wall of the sidewall, which effectively reduces the damage to the tire caused by puncture to improve the air-captive property of the tire.

A compound of a lateral insert of a run-flat pneumatic tyre comprising a cross-linkable unsaturated chain polymer base that is capable of assuming all of the chemical-physical and mechanical characteristics of an elastomer after cross-linking, a filler, a plasticizing agent and a curing system. The plasticizing agent consists of an aliphatic chain and has a melting temperature of between 50 C. and 100 C.

The present invention is directed to a functionalized elastomer comprising the reaction product of a living anionic elastomeric polymer and a polymerization terminator of formula I

##STR00001##

wherein R.sup.1 is C1 to C4 linear alkyl, or C1 to C4 branched alkanediyl; X.sup.1, X.sup.2, X.sup.3 are independently O, S, or a group of formula (II) or (III)

##STR00002##

where R.sup.2 is C1 to C18 linear or branched alkyl; and Z is R.sup.3CHCHR.sup.4, where R.sup.3 is a covalent bond or C1 to C18 linear or branched alkanediyl, and R.sup.4 is a hydrogen or C1 to C18 linear or branched alkyl.

An object of the present disclosure is to provide a tire production method which effectively inhibits the migration of sulfur to a vulcanizing bladder in a process of vulcanizing an unvulcanized tire provided at an inner surface thereof with a member having a high concentration of sulfur. Specifically, a tire production method includes a vulcanization process of vulcanizing an unvulcanized tire which is provided, in at least a portion of the innermost surface thereof, with a high sulfur concentration rubber member made of a rubber composition containing sulfur by 1.0 parts by mass with respect to 100 parts by mass of a rubber component, wherein the vulcanization process employs a vulcanizing bladder made of a rubber composition for a bladder, which rubber composition contains fluororubber by 50 mass % to 100 mass %.

The vulcanized rubber of the present invention is a vulcanized rubber, which is formed from a rubber composition containing a rubber component containing a dienic rubber, and a vulcanizing agent, and has a tensile modulus of elasticity at 25% elongation at 100 C. of 1.2 MPa or more, with a ratio of an Sx bond (where x is 3 or more) to all sulfide bonds being 30% or less. The vulcanized rubber, the tire and the run-flat tire of the invention are excellent in durability life.