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Abstract

Disclosed are a conjugated diene-based polymer from which a polymer composition excellent in fuel cost-saving properties and a tensile strength at break can be obtained. There is provided a conjugated diene-based polymer having a monomer unit based on a conjugated diene, a monomer unit based on a compound represented by the following formula (1), and a monomer unit based on a compound represented by the following formula (2), in which at least one end of the polymer is modified with the following compound (G).

description='In-line Formulae' end='lead'V¹-S¹  (1)description='In-line Formulae' end='tail'

wherein V¹ represents a hydrocarbyl group having a polymerizable carbon-carbon double bond, and S¹ represents a substituted silyl group.)

description='In-line Formulae' end='lead'V²-A²  (2)description='In-line Formulae' end='tail'

wherein V² represents a hydrocarbyl group having a polymerizable carbon-carbon double bond, and A² represents a substituted amino group, or a nitrogen-containing heterocyclic group.

Compound (G): at least one kind of compound selected from the compound group consisting of a compound having an amino group optionally having a substituent and a carbonyl group, and a compound having an amino group optionally having a substituent and a thiocarbonyl group.

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