A process for manufacturing a masterbatch comprises the following steps: (a) bringing at least one initial polymer comprising at least one carbon-carbon unsaturation into contact with at least one 1,3-dipolar grafting agent bearing at least one nitrile oxide dipole in the presence of at least one organophosphorus additive selected from the group consisting of phosphoric acid triesters, phosphonates, phosphinates, phosphine oxides and the mixtures of these compounds, and (b) recovering the masterbatch obtained in the preceding step. The masterbatch and compositions containing it and also tires comprising such compositions are also disclosed.

An elastomeric composition is disclosed. The elastomeric composition includes, per 100 parts by weight of rubber (phr): 0 to about 50 phr of a polybutadiene having a cis-1,4 linkage content of at least 95%; about 50 to 100 phr of natural rubber or polyisoprene; a curative agent; an antioxidant; about 10 to about 80 phr carbon black; optionally about 30 to about 70 phr silica; about 1 to about 20 phr hydrocarbon resin; and about 5 to about 30 phr of a polymer selected from the group consisting of ethylene-propylene-diene terpolymer, butyl rubber, poly(isobutylene-co-para-methylstyrene) and poly(isobutylene-co-para-methyl-styrene-co-isoprene) terpolymer. The polymer based on ethylene-propylene-diene terpolymer, butyl rubber, oly(isobutylene-co-para-methylstyrene) and poly(isobutylene-co-para-methylstyrene-co-isoprene) terpolymer may be functionalized.

An elastomeric composition is disclosed. The elastomeric composition includes, per 100 parts by weight of rubber (phr): about 5 to about 40 phr of styrene/butadiene copolymer; about 60 to about 100 phr of natural mbber or polyisoprene; a curative agent; an antioxidant; about 1 to about 20 phr carbon black; about 5 to about 40 phr plasticizing agent; about 40 to about 80 phr silica; about 1 to about 20 phr silane coupling agent and about 5 to about 30 phr of a polymer selected from the group consisting of ethyl-ene-propylene-diene terpolymer, butyl mbber, poly(isobutylene-co-para-methylstyrene) and poly(isobutylene-co-para-methylstyrene-co-isoprene) terpolymer. The polymer based on ethylene-propylene-diene terpolymer, butyl mbber, poly(isobutylene-co-para-methylstyrene) and poly(isobutylene-co-para-methylstyrene-co-isoprene) terpolymer may be functionalized.

Provided is a rubber composition being excellent in cut resistance while maintaining good elongation fatigue resistance. The rubber composition of the present disclosure contains a rubber component containing 70% by mass or more of natural rubber, a filler containing at least silica, and a cyclic polyol compound having a hydrocarbyl group of 0.1 parts by mass to 2 parts by mass with respect to 100 parts by mass of the natural rubber in the rubber component.

Provided are a rubber composition which provides a self-healing rubber with improved strength and wet grip performance, and a pneumatic tire including the rubber composition. The present disclosure relates to a rubber composition containing a rubber component having a functional group containing a cationic functional group and/or an anionic functional group, a filler capable of generating a charge paired with the functional group, and sulfur.

A tire having excellent wet grip performance and low rolling resistance is provided. This tire is a tire obtained by using a rubber composition that includes a rubber component containing a rubber having an isoprene structure and an aminoalkoxysilane-modified styrene-butadiene rubber having an amount of bonded styrene of 15% or less; a filler containing a silica having a nitrogen adsorption specific surface area (BET method) of 130 m.sup.2/g or more and less than 330 m.sup.2/g, the amount of the filler being 40 to 125 parts by mass with respect to 100 parts by mass of the rubber component; and a hydrogenated resin having a softening point of higher than 110° C. and having a weight average molecular weight as converted to polystyrene of 200 to 1200 g/mol, the amount of the hydrogenated resin being 5 to 50 parts by mass per 100 parts by mass of the rubber component.

A rubber composition includes: a rubber component; a filler in an amount of 40 to 125 parts by mass per 100 parts by mass of the rubber component; and a hydrogenated resin in an amount of 5 to 50 parts by mass per 100 parts by mass of the rubber component, the resin having a softening point of higher than 110° C. and a weight average molecular weight, as determined in terms of polystyrene, of 200 to 1200 g/mol. The rubber composition can be used to produce a tire having an excellent wet grip performance and a low rolling resistance, and a vulcanized rubber having excellent handling properties.

A vulcanizable rubber composition comprises an interpenetrating or ionic network (IPN)-promoting resin. The resin comprises side chain functional groups along the resin backbone, which, in the presence of an additive material, form the connections that make up the IPN. In one embodiment, such material is ZnO. A method for forming the rubber composition comprises, in a productive step, mixing the product of the non-productive step, the zinc oxide, and a resin derived from maleic anhydride. The zinc oxide and the resin are simultaneously added to the composition during the productive mixing stage. The rubber composition can be cured and incorporated in a tire component, such as, a tread.

Provided are a rubber composition having excellent overall performance in terms of fuel economy and bleed resistance as well as good LCA performance (e.g., reduction of CO.sub.2 emissions), and a tire including the composition. A rubber composition containing a plant oil satisfying the conditions (1)-(4): (1) it is liquid at 23° C.; (2) it has a GPC weight-average molecular weight of more than 800; (3) when it is 3-fold diluted with THF, it satisfies the following relationship with respect to the absorbances at 450 nm and 600 nm measured with a spectrophotometer: Absorbance at 450 nm−Absorbance at 600 nm 0.05; and (4) it satisfies the following relationship with respect to the weights before and after passing 100 g of the plant oil at 23-30° C. through 20 mesh plain weave wire cloth: (Weight after passing through plain weave wire cloth)/(Weight before passing through plain weave wire cloth)×100≥99.0.

A rubber composition for a tire, which does not require the addition of a compound when synthesizing rubber component and the modification of a rubber component, and a winter tire using the rubber composition are provided. The rubber composition for a tire contains fine particles of rotaxane having a straight chain molecule, acyclic molecule clathrating the straight chain molecule and blocking groups arranged at both terminals of the straight chain molecule such that the cyclic molecule does not desorb from the straight chain molecule, covered with silica; a rubber component comprising styrene-butadiene rubber; and at least one of carbon black and silica, wherein the total content of the fine particles, the carbon black and the silica (excluding silica covering rotaxane) is 70 to 150 parts by mass per 100 parts by mass of the rubber component.