This disclosure is to provide a method for preparing a terminal-modified conjugated diene polymer which achieves an extremely high compounding amount of cis-1,4 without complicated preparing conditions, a terminal-modified conjugated diene polymer obtained via the method, a rubber composition containing the terminal-modified conjugated diene polymer, and a tire using the rubber composition. This disclosure is A method for preparing a terminal-modified conjugated diene polymer comprising: polymerizing a conjugated diene compound by using a polymerization catalyst composition and modifying a polymer obtained via the polymerization by using a modifier, wherein the polymerization catalyst composition contains a rare earth element compound, and a coordination compound having a cyclopentadiene skeleton selected from substituted or unsubstituted cyclopentadienes, substituted or unsubstituted indenes, and substituted or unsubstituted fluorenes, and wherein the polymerization and modification is performed in a one-pot way.

A rubber composition for a tire containing a cyclopentene ring-opening polymer and a solution polymerized styrene-butadiene rubber. The rubber composition is a cross-linked rubber with excellent wet grip and low heat buildup properties.

The invention relates to the use of a nanoparticle composition as a heat transfer fluid in battery or other electrical equipment systems. The electrical equipment can be in particular electric batteries, electric motors, electric vehicle transmissions, electric transformers, electric capacitors, fluid-filled transmission lines, fluid-filled power cables, computers and power electronics such as electric power converters.

The present invention provides a pneumatic tire having well-improved rubber tensile strength and abrasion resistance while maintaining or improving good fuel economy. The present invention relates to a pneumatic tire formed from a rubber composition, the rubber composition containing: a hydrogenated copolymer obtained by copolymerization of an aromatic vinyl compound and a conjugated diene compound, the hydrogenated copolymer having a degree of hydrogenation of the conjugated diene units of 75 mol % or more; carbon black; and silica, the rubber composition containing, per 100% by mass of the rubber component, 75% by mass or more of the hydrogenated copolymer, the rubber composition containing, relative to 100 parts by mass of the rubber component, 3 parts by mass or more of the carbon black and 1 to 200 parts by mass of the silica.

The present invention provides a pneumatic tire having well-improved rubber tensile strength and abrasion resistance while maintaining or improving good fuel economy. The present invention relates to a pneumatic tire formed from a rubber composition, the rubber composition containing: a hydrogenated copolymer obtained by copolymerization of an aromatic vinyl compound and a conjugated diene compound, the hydrogenated copolymer having a degree of hydrogenation of the conjugated diene units of 75 mol % or more; carbon black; and silica, the rubber composition containing, per 100% by mass of the rubber component, 75% by mass or more of the hydrogenated copolymer, the rubber composition containing, relative to 100 parts by mass of the rubber component, 3 parts by mass or more of the carbon black and 1 to 200 parts by mass of the silica.

To provide a process for producing an acrylic rubber/fluorinated rubber composition, capable of forming a layer excellent in the interlayer-adhesion with a layer formed by crosslinking a fluorinated rubber. A process for producing an acrylic rubber/fluorinated rubber composition having particles of a crosslinked acrylic rubber (B) dispersed in a continuous phase of a fluorinated rubber (A), which comprises kneading a fluorinated rubber (A), a crosslinking agent for an acrylic rubber and a crosslinking coagent for an acrylic rubber to obtain a fluorinated rubber composition containing the crosslinking agent for an acrylic rubber and the crosslinking coagent for an acrylic rubber, and kneading under heating the obtained fluorinated rubber composition and an acrylic rubber (B) in a mass ratio of fluorinated rubber (A)/acrylic rubber (B)=5/95 to 50/50 to crosslink the acrylic rubber (B), and dispersing particles of the crosslinked acrylic rubber (B) in a continuous phase of the fluorinated rubber (A).

To provide a process for producing an acrylic rubber/fluorinated rubber composition, capable of forming a layer excellent in the interlayer-adhesion with a layer formed by crosslinking a fluorinated rubber. A process for producing an acrylic rubber/fluorinated rubber composition having particles of a crosslinked acrylic rubber (B) dispersed in a continuous phase of a fluorinated rubber (A), which comprises kneading a fluorinated rubber (A), a crosslinking agent for an acrylic rubber and a crosslinking coagent for an acrylic rubber to obtain a fluorinated rubber composition containing the crosslinking agent for an acrylic rubber and the crosslinking coagent for an acrylic rubber, and kneading under heating the obtained fluorinated rubber composition and an acrylic rubber (B) in a mass ratio of fluorinated rubber (A)/acrylic rubber (B)=5/95 to 50/50 to crosslink the acrylic rubber (B), and dispersing particles of the crosslinked acrylic rubber (B) in a continuous phase of the fluorinated rubber (A).

Polymers may be functionalzed with terminal groups, where the terminal groups have, at the chain end, an ether-containing carbinol group of the formula (I)
O-A-OH]  (I)
where A is a divalent organic moiety which can comprise not only C and H but also heteroatoms, such as O, N, S, Si.

Polymers may be functionalzed with terminal groups, where the terminal groups have, at the chain end, an ether-containing carbinol group of the formula (I)
O-A-OH]  (I)
where A is a divalent organic moiety which can comprise not only C and H but also heteroatoms, such as O, N, S, Si.

[Problem to be Solved] Provided is a method for producing a non-petrochemical-derived conjugated diene polymer using an alcohol derived from a non-petrochemical raw material.

[Means to Solve the Problem] In the present invention, the method is characterized in that a non-petrochemical-derived conjugated diene polymer is produced using an alcohol derived from a non-petrochemical raw material having an iron content of 0.0001 mg/L to 2 mg/L.