A tire sidewall comprising a vulcanized rubber and a high molecular weight wax.

A tire having a toe guard formed of a rubber composition having between 40 phr and 70 phr of natural rubber and between 30 phr and 60 phr of a synthetic rubber component. The synthetic rubber component may be selected from the group consisting of a polybutadiene rubber (BR), a styrene butadiene rubber (SBR), a polyisoprene rubber (IR) and combinations thereof but includes an amount of BR that is between 25 wt % and 100 wt % of the total weight of the synthetic rubber component. The rubber composition further includes a reinforcing filler, a methylene donor and a methylene acceptor reinforcing resin system and a sulfur curing system having a ratio by weight of the sulfur to one or more accelerators that is less than 1.

Provided is a tire which includes a circular tire frame formed from a resin material that contains a linear low-density polyethylene having a crystallization degree of from 110 J/g to 138 J.

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.

Provided are: a rubber additive that enables to provide a rubber composition having excellent low heat generation properties and manufacturing operability; a rubber composition including the rubber additive; and a pneumatic tire including the rubber composition. The rubber additive is characterized by containing a hydrazide compound represented by Formula (I) below, where R represents a hydroxyl group, an alkyl group having 1 to 4 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms and A represents an alkylene group having 1 to 4 carbon atoms or an alkenylene group having 2 to 4 carbon atoms; the rubber composition containing the rubber additive; and the pneumatic tire including the rubber composition:

##STR00001##

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 invention provides a heavy-duty tire rubber composition excellent in wet grip performance and steering stability, and a tire tread, a bead filler, a tire belt and a heavy-duty tire which each partially include the composition. The heavy-duty tire rubber composition includes 100 parts by mass of a solid rubber (A), 0.1 to 50 parts by mass of a modified liquid diene rubber (B) having a functional group derived from a silane compound with a specific structure, and 20 to 200 parts by mass of a filler (C), the modified liquid diene rubber (B) satisfying the following (i) and (ii): (i) the weight average molecular weight (Mw) is not less than 1,000 and not more than 120,000, and (ii) the vinyl content is not less than 30 mol % and less than 70 mol %.

Provided is an additive for imparting low heat build-up to a rubber component, wherein the additive includes a tetrazine compound represented by general formula (1):

##STR00001##

(wherein X.sup.1 and X.sup.2 are the same or different and represent a hydrogen atom or an alkyl, alkylthio, aralkyl, aryl, arylthio, heterocyclic, or amino group; and each of these groups may have one or more substituents), or a salt thereof.

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.