A method for preparing a coupled polymer, the method comprising the steps of (i) polymerizing monomers to form a reactive polymer, and (ii) reacting the reactive polymer with a glycidic ester.

A method for preparing a coupled polymer, the method comprising the steps of (i) polymerizing monomers to form a reactive polymer, and (ii) reacting the reactive polymer with a glycidic ester.

The present invention relates to a modification initiator and a modified conjugated diene-based polymer including the same, and more particularly, the present invention provides a modification initiator including a compound represented by Formula 1, a modified conjugated diene-based polymer including the same, and a method of preparing a modified conjugated diene-based polymer.

The present invention relates to a modification initiator and a modified conjugated diene-based polymer including the same, and more particularly, the present invention provides a modification initiator including a compound represented by Formula 1, a modified conjugated diene-based polymer including the same, and a method of preparing a modified conjugated diene-based polymer.

A method for preparing a functionalized polymer, the method comprising the steps of preparing a reactive polymer and reacting the reactive polymer with a heterocyclic nitrile compound.

A method for preparing a functionalized polymer, the method comprising the steps of preparing a reactive polymer and reacting the reactive polymer with a heterocyclic nitrile compound.

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. ##STR00001##
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 relates to a rubber modifier, a conjugated diene-based polymer including a functional group derived from the modifier, and a method for preparing a modified and conjugated diene-based polymer using the modifier. The modifier is used as the modifier of a conjugated diene-based polymer and combined with a conjugated diene-based polymer chain to easily introduce a functional group having affinity with a filler. Accordingly, a modified and conjugated diene-based polymer prepared using a compound of the rubber modifier may have excellent affinity with a filler, and as a result, molded articles (for example, tires) manufactured from a rubber composition including the polymer may have excellent tensile strength, abrasion resistance, and wet traction.

The present invention relates to a rubber modifier, a conjugated diene-based polymer including a functional group derived from the modifier, and a method for preparing a modified and conjugated diene-based polymer using the modifier. The modifier is used as the modifier of a conjugated diene-based polymer and combined with a conjugated diene-based polymer chain to easily introduce a functional group having affinity with a filler. Accordingly, a modified and conjugated diene-based polymer prepared using a compound of the rubber modifier may have excellent affinity with a filler, and as a result, molded articles (for example, tires) manufactured from a rubber composition including the polymer may have excellent tensile strength, abrasion resistance, and wet traction.

The present invention is to provide a diene polymer that exhibits excellent low rolling resistance when used in a tire, a method for producing the diene polymer, and a rubber composition containing the diene polymer. The diene polymer of an embodiment of the present invention is produced by polymerizing a monomer containing at least a diene monomer by using an initiator prepared from an organolithium compound, an alkyl aluminum, and a metal alcoholate, and then terminating the polymerization by using an electrophile selected from the group consisting of titanium halides, tin halides, cyclic silazanes, alkoxysilanes, epoxides, amines, ketones, and compounds represented by Formula (N) below.

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