Blends of elastomer composites with unfilled or less highly filled elastomer reduces hysteresis without compromising reinforcement. Hysteresis may also be reduced by adjusting the compounding method.

Provided is a cold weather tire achieving a balanced improvement in fuel economy, abrasion resistance, performance on ice and snow, and high-speed performance (handling stability, grip performance) on snow- and ice-free roads at low temperatures. The cold weather tire includes a cap tread formed of a rubber composition that contains: a rubber component including polybutadiene rubber, styrene butadiene rubber, and natural rubber and/or polyisoprene rubber; and a filler, the rubber composition having a combined amount of the natural rubber, polyisoprene rubber, and polybutadiene rubber of 80% by mass or more, an amount of the polybutadiene rubber of 30% by mass or more, and an amount of the styrene butadiene rubber of 0.3-10% by mass, each based on 100% by mass of the rubber component, the filler including 60% by mass or more of silica based on 100% by mass of the filler, the cap tread having cells and/or voids.

In order to allow a braking property on wet roads and a wear resistance to be compatible, provided is a method for producing a rubber composition passing through a stage including a kneading step in which kneaded are 100 parts by mass of a rubber component (A) containing 60% by mass or more of a styrene-butadiene copolymer rubber, 30 to 80 parts by mass of silica (B), 5 to 14 parts by mass of a silane coupling agent (C), 3 to 14 parts by mass of a thermoplastic resin (D), and thiourea compound (E), and including subsequently a kneading step in which a vulcanizing agent (F) is further added and kneaded.

The invention relates to a phased rubber composition and tire tread thereof intended for heavy duty service such as for example a truck tire. The phased rubber composition is comprised of the product of blending a first rubber phase comprised of cis 1,4-polybutadiene rubber and reinforcing filler comprised of rubber reinforcing carbon black and a second rubber phase comprised of natural cis 1,4-polyisoprene rubber and reinforcing filler comprised of precipitated silica.

A sulfur-crosslinkable rubber mixture and a process for producing the sulfur-crosslinkable rubber mixture, in which the sulfur-crosslinkable rubber mixture contains at least the following constituents: a) 30 to 95 phr of at least one butadiene rubber; and b) 5 to 70 phr of at least one further rubber; and c) 0.1 to 3.0 phr of an oligomer mixture of 2,2,4-trimethyl-1,2-dihydroquinoline, wherein the mixture contains 70% to 100% by weight of dimers and trimers of 2,2,4-trimethyl-1,2-dihydroquinoline.

A masterbatch composition of elastomer and from 20 to 100 parts per hundred parts elastomer of fibrous micropulp wherein the micropulp has fibers with a volume weighted average fiber length of from 20 to 200 micrometers as measured by laser diffraction, a relative specific surface area of from 30 to 600 square meter per gram as measured by nuclear magnetic resonance and the fibers selected from the group consisting of aromatic polyamide, aromatic copolyamide, polyacrylonitrile and polyazole.

Provided is a composition for a foam tire. The composition includes 100 parts by weight of a blend of an olefin block copolymer and a rubber as a polymer matrix, 0.02 to 4 parts by weight of a crosslinking agent, and 1 to 6 parts by weight of a foaming agent. The olefin block copolymer and the rubber are present in amounts of 50 to 80% by weight and 20 to 50% by weight, respectively, based on the total weight of the polymer matrix.

The invention relates to a phased rubber composition and tire tread thereof intended for heavy duty service such as for example a truck tire. The phased rubber composition is comprised of the product of blending a first rubber phase comprised of cis 1,4-polybutadiene rubber and reinforcing filler comprised of rubber reinforcing carbon black and a second rubber phase comprised of natural cis 1,4-polyisoprene rubber and reinforcing filler comprised of precipitated silica.

Provided are a process for efficiently producing a rubber wet master batch in which a dispersibility of carbon black in the rubber is improved, in which a reinforcing property and an abrasion resistance of the rubber can be enhanced by using carbon black having a high surface activity, in which a yield of the carbon black in the wet master batch obtained is not reduced and in which a handling property of the carbon black is good as compared with master batches prepared by using a granulated and dried substance of carbon black prepared by a conventional wet method and non-granulated carbon black, a carbon black-containing rubber wet master batch obtained by the above process and a rubber composition and a tire prepared by using the master batch. It is a process for producing a rubber wet master batch comprising a step for mixing a slurry (A) in which a filler containing carbon black is dispersed with a rubber liquid (B) in which a rubber component is dispersed or dissolved, wherein the slurry (A) is prepared by using a filler containing a carbon black granulated substance which is granulated by a wet method and which stays in a non-drying state.

A rubber composition is provided and includes a first elastomer, a second elastomer, carbon black, a plasticizer, a blowing agent, and a filler. The first elastomer is provided in a range of 15.97-34.71 wt %, while the second elastomer is provided in a range of of 8.37-16.22 wt %. Carbon black is provided in the range of 13.29-23.00 wt %. The plasticizer is provided in a range of 13.71-20.02 wt %, and the blowing agent is provided in a range of 3.22-5.11 wt %. The filler is provided to complete the composition.