Provided is a rubber composition for tires which contains: a rubber component including an aromatic vinyl-conjugated diene copolymer that contains aromatic vinyl units and conjugated diene units, a high-cis polybutadiene rubber having a cis microstructure content of 95% by mass or higher, and an isoprene-based rubber; carbon black; and a silica having a N.sub.2SA of 40 m.sup.2/g or more, the copolymer containing at least 80% of isolated aromatic vinyl units based on the total aromatic vinyl units, the copolymer having a Tg of more than 10 C. but less than 20 C. as determined by DSC, the rubber component including, based on 100% by mass thereof, 1-45% by mass of the copolymer, 20-64% by mass of the high-cis polybutadiene rubber, and 35-60% by mass of the isoprene-based rubber, the rubber composition containing 5 parts by mass or more of the silica per 100 parts by mass of the rubber component.

A rubber compound for body ply skim comprising: a mix of rubber consisting of (i) Epoxidized Natural Rubber acting as polymer base with a cross-linkable unsaturated chain; (ii) Natural Rubber acting as polymer base with a cross-linkable unsaturated chain; (iii) Polyepihalohydrin rubber, a filler material, anda vulcanization system; The compound comprises: 70 to 90 phr of said Polyepihalohydrin rubber; 5 to 25 phr of said Epoxidized Natural Rubber (E-NR); and 5 to 25 phr of said Natural Rubber (NR); the phr ratio between E-NR and NR ranging from 0.2 to 5.0.

The present invention relates to a liquid butadiene compound with both ends modified, a method for preparing same, and a use thereof. More specifically, the present invention provides a liquid butadiene rubber compound with both ends modified that is synthesized using a chain transfer agent having a triethoxysily functional group and a tetrasulfide functional group, and a 1,3-butadiene monomer, a rubber composition for a tire comprising same, a method for preparing same, and the like. According to the present invention, by introducing a silica-friendly functional group at both ends of the chain, hysteresis or the like caused by the chain ends of an existing liquid butadiene rubber is controlled, and thus, various performances affecting fuel efficiency characteristics can be improved.

The present invention relates to a liquid butadiene compound with both ends modified, a method for preparing same, and a use thereof. More specifically, the present invention provides a liquid butadiene rubber compound with both ends modified that is synthesized using a chain transfer agent having a triethoxysily functional group and a tetrasulfide functional group, and a 1,3-butadiene monomer, a rubber composition for a tire comprising same, a method for preparing same, and the like. According to the present invention, by introducing a silica-friendly functional group at both ends of the chain, hysteresis or the like caused by the chain ends of an existing liquid butadiene rubber is controlled, and thus, various performances affecting fuel efficiency characteristics can be improved.

The present invention relates to the synthesis of polymer polyols in unsaturated polyols as liquid phase, polymer polyols and their use.

The present invention relates to the synthesis of polymer polyols in unsaturated polyols as liquid phase, polymer polyols and their use.

Provided are: a thermoplastic elastomer composition, excellent in both abrasion resistance and mechanical characteristics, obtained by heat-treating a mixture under molten condition thereof, the mixture including: 100 parts of at least one addition-polymerized block copolymer selected from a block copolymer and a hydrogenated product thereof; the block copolymer has a polymer block mainly including a structural unit derived from an aromatic vinyl compound and containing 1% by mass or more of a structural unit derived from a styrene having an alkyl group bonded to a benzene ring and a polymer block mainly including a structural unit derived from a conjugated diene compound, 10 to 300 parts olefin-based resin, 0.01 to 20 parts crosslinking agent; 1 to 50 parts crosslinking adjuvant containing one methacryloyl group, one acryloyl group, and one or more hydroxyl group, and 30 to 250 parts rubber softener; and a molded article including the said thermoplastic elastomer composition.

A pneumatic tire using as a tread part, a rubber composition containing a high silica-content rubber composition having a difference F-S between an amount of filler F and an amount of a softening agent S of 60 to 90 parts by weight and having a durometer hardness measured at 20 C. of 65 to 76.

A pneumatic tire using as a tread part, a rubber composition containing a high silica-content rubber composition having a difference F-S between an amount of filler F and an amount of a softening agent S of 60 to 90 parts by weight and having a durometer hardness measured at 20 C. of 65 to 76.

The present invention relates to a modified polymer having the structure of Formula (I) and Formula (IV):

##STR00001##

wherein A,

##STR00002##

R.sup.1, R.sup.2, R.sup.3, a, and n are as described herein and

##STR00003##

wherein

##STR00004##

R, R, R, x, and k are as described herein and methods for preparation thereof. The present invention also relates to a compound having the structure of Formula (II):

##STR00005##

wherein A, R.sup.1, R.sup.2, R.sup.3, a, and n are as described herein. The present invention also relates to a process for polymerizing unsaturated hydrocarbon monomers.