Patent ID: 7767774

Claim:
A modified conjugated diene polymer comprising a homopolymer of a conjugated diene compound or a copolymer of a conjugated diene compound and an aromatic vinyl compound and characterized by the following formula (I): wherein R 1 and R 2 are independently an alkyl or aryl group having a carbon number of 1-20, a substituted silyl group or a hydrogen atom; R 3 is an alkylene or arylene group having a carbon number of 1-12 provided that it may include a hetero atom provided that it does not have an active proton; Y 1 is a substituted silyl group or a hydrogen atom; a part of R 1 , R 2 , R 3 and Y 1 may be bonded to each other to form a cyclic structure; Poly is a homopolymer part of a conjugated diene compound or a copolymer portion of a conjugated diene compound and an aromatic vinyl compound; Z 1 is an alkali metal, an alkaline earth metal salt or an alkaline earth metal alkyl group, or a residue produced by reacting with a carbanion reactive compound, or a hydrogen atom provided that when Z 1 is an alkali metal, an alkali earth metal salt or an alkaline earth metal alkyl group, none of R 1 , R 2 and Y 1 is the hydrogen atom.