An ethylenically unsaturated polymer includes at a terminus the radical of an allylic compound that includes a functional group free of active hydrogen atoms that is bonded to the allylic C atom through a S, P, Si or Sn atom and a vinyl aromatic compound. The polymer can be used as a component of a variety of elastomeric compounds used in the production of vulcanizates.

Provided is a rubber composition that achieves both wet performance and low loss property while delivering excellent dry handling performance. A rubber composition comprises: a rubber component; and a styrene-alkylene block copolymer, wherein a total styrene content of the styrene-alkylene block copolymer is 30 mass % or more with respect to a total mass of the styrene-alkylene block copolymer, and the rubber component contains a styrene butadiene rubber having a styrene content of 30 mass % or more.

The present disclosure relates to a rubber composition for tire tread and a tire manufactured by using the rubber composition for the tire tread, and more specifically to, a rubber composition for tire tread, the rubber composition comprising: 100 parts by weight of a raw rubber; 50 to 200 parts by weight of a reinforcing filler; 5 to 100 parts by weight of a hydrocarbon-based resin; and 5 to 50 parts by weight of a hydrogenated styrene-butadiene rubber, and a tire manufactured by using the rubber composition for the tire tread.

The present invention relates to a cross-linkable rubber composition, a cross-linked rubber composition obtained by cross-linking such a rubber composition, a method of preparing a tyre and a tyre. In a cross-linkable rubber composition the cross-linkable rubber composition comprises, per hundred parts by weight of rubber (phr): ≤50 phr of a first rubber, the first rubber being a solution polymerized styrene-butadiene rubber (SSBR) comprising an alkoxysilane group and a primary amino group; ≥20 phr of a second rubber; and a coupling agent, a filler, and a resin, wherein the rubber composition comprises >15 phr of a third rubber; and ≥10 phr of a fourth rubber; and wherein the composition comprises ≥1 phr to ≤20 phr of at least two coupling agents wherein one of the coupling agents is or comprises a mercapto based silane and wherein the ratio of the mercapto based silane to the second coupling agent is in a range of ≥2:1 to ≤10:1.

Provided is a pneumatic tire having excellent abrasion resistance and excellent handling stability on an extremely cold road while having a reduced weight. The present disclosure relates to a pneumatic tire, including a tread having a hardness at −20° C. of 90 or less, a hardness at 30° C. of 60 or more, and a maximum thickness of 8.5 mm or less, and a carcass including one carcass ply.

The conjugated diene-based polymer has a Mooney viscosity measured at 100° C. of 40 or more and 170 or less, has Mooney stress relaxation measured at 100° C. of 0.35 or less, and has a branch number (Bn) measured by viscosity detector-equipped GPC-light scattering measurement of 8 or more.

A pneumatic tire having a toroidal tire framework member having bead portions, sidewall portions and an under tread portion, and a ground contacting tread component disposed radially outside the under tread portion. The tire framework member and the ground contacting tread component are made of a resin material, and a tensile elastic modulus of the ground contacting tread component is smaller than that of the tire framework member. The tread thickness between the radially inner surface of the under tread portion and the radially outer surface of the ground contacting tread component is such that the tread thickness X2 at a tread edge is more than 1.2 times and less than 5.0 times the tread thickness X1 at the tire equator.

Disclosed herein are tires having a tread with improved wet performance and improved stiffness made from a rubber composition of specified ingredients including an elastomer component, a terpene phenol resin having a specified hydroxyl value, a filler component including reinforcing silica filler and carbon black, optionally a liquid plasticizer, and a cure package. Also disclosed are methods for improving the wet performance and stiffness of a tire tread by using a terpene phenol resin having a specified hydroxyl value in a rubber composition comprising an elastomer component, a filler component including reinforcing silica filler and carbon black, optionally a liquid plasticizer, and a cure package.

The invention relates to a plasticizer system for use in a tread rubber composition. The plasticizer system is partially derived from or devoid of petroleum-based oils and resins. The pneumatic tire has a tread of a rubber composition comprising, based on 100 parts by weight of elastomer (phr): from about 10 to about 60 phr of a solution polymerized styrene-butadiene rubber (SSBR) extended with an oil not derived from petroleum; and a plasticizer system comprised of (1) from about 4 to about 8 phr of a plasticizing oil not derived from petroleum, and (2) from about 10 to about 20 phr of a hydrocarbon plasticizing resin selected from styrene/α-methyl styrene resin and polyterpene plasticizing resin.

A heavy truck tire is provided that includes a casing with a central axis, and a rubber tread that has a first layer and a second layer. The first layer is located farther from the central axis in a radial direction than the second layer. The first layer has a lower max tan(δ) than a max tan(δ) of the second layer. The max tan(δ) of the first layer is from 0.06-0.15, and the max tan(δ) of the second layer is from 0.12-0.27. The tire also has a sculptural feature that reduces irregular wear.