A hydrogenated conjugated diene-based polymer of the present invention has a branch number (Bn) measured by viscosity detector-equipped GPC-light scattering measurement of 2.5 or more, and a hydrogenation rate of a structural unit derived from a conjugated diene compound of 30% or more and less than 99%.

The present invention aims to provide tire rubber composition with significantly improved overall performance in terms of wet grip performance and fuel economy, and pneumatic tires including the rubber compositions. The tire rubber compositions of the present invention have a tan δ versus temperature curve whose peak tan δ and half width satisfy the following relationship (1): Peak tan δ/Half width ≥ 0.025 (1).

There is disclosed a modified conjugated diene polymer including a structural unit derived from a compound represented by formula (1), and a structural unit derived from a conjugated diene.

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When n is 0, at least two of R.sup.11, R.sup.12, R.sup.13, R.sup.16, R.sup.17 and R.sup.18 are substituted amino groups, and at least one is a hydroxy group or hydrocarbyloxy group.

The present invention is to provide: a rubber composition which has excellent wet grip performance and wear resistance while maintaining the elongation thereof at a high level; and a pneumatic tire and a conveyer belt produced using the rubber composition. The present invention provides: a rubber composition containing a polymer containing from 10 to 90 mass % of a modified diene rubber having a carboxy group and an epoxy compound having a plurality of epoxy groups in each molecule, the content of the epoxy compound being from 0.1 to 5 parts by mass per 100 parts by mass of the polymer; and a pneumatic tire and a conveyor belt produced using the rubber composition.

A method for preparing a functionalized polymer, the method comprising the steps of: (i) polymerizing monomer to form a reactive polymer, and (ii) reacting the reactive polymer with an imine compound containing a heterocyclic group and a hydrocarbyloxy-substituted or silyloxy-substituted aryl group.

A method for preparing a functionalized polymer, the method comprising the steps of: (i) polymerizing monomer to form a reactive polymer, and (ii) reacting the reactive polymer with an imine compound containing a heterocyclic group and a hydrocarbyloxy-substituted or silyloxy-substituted aryl group.

A peroxide formulation includes at least one peroxide and at least one compound having a secondary amine group selected from amino acids, such as arginine, folic acid, and polyethyleneamines. The peroxide formulation is capable of curing an aqueous elastomer such as a latex in the full or partial presence of oxygen. Methods of using the peroxide formulation include dip-molding latex elastomer compositions.

A peroxide formulation includes at least one peroxide and at least one compound having a secondary amine group selected from amino acids, such as arginine, folic acid, and polyethyleneamines. The peroxide formulation is capable of curing an aqueous elastomer such as a latex in the full or partial presence of oxygen. Methods of using the peroxide formulation include dip-molding latex elastomer compositions.

The present invention relates to a rubber composition having excellent tensile properties and viscoelasticity properties and including a conjugated diene-based polymer. The rubber composition may include a modified conjugated diene-based polymer which is selected considering target tensile properties and viscoelasticity properties, by predicting in advance the correlation between the modification ratio of the modified conjugated diene-based polymer and the dynamic viscoelasticity loss coefficient at 60° C. of the rubber composition through Mathematical Formula 1 and Mathematical Formula 2. Therefore, excellent compounding properties may be shown.

Disclosed are a method of preparing a modified conjugated diene-based polymer, a modified conjugated diene-based polymer prepared thereby, a rubber composition including the modified conjugated diene-based polymer, and a tire including the rubber composition. The method of preparing the modified conjugated diene-based polymer includes (a) polymerizing a vinyl aromatic monomer and a conjugated diene monomer through continuous solution polymerization using a multifunctional anionic polymerization initiator in the presence of a hydrocarbon solvent, thus forming an active polymer having a reactive end; and (b) coupling or linking the reactive end of the active polymer with an alkylamino alkoxy silane compound.