Patent ID: 8202944

Claim:
A modified polymer obtained by reacting, with an active metal bonded to a polymer obtained by coordination polymerization, a modifier represented by a general formula (I): where X 1 to X 5 independently represent a hydrogen atom or a monovalent functional group containing at least one member selected from the group consisting of a halogen atom, a carbonyl group, a thiocarbonyl group, an isocyanate group, a thioisocyanate group, an epoxy group, a thioepoxy group, a halogenated silyl group, a hydrocarbyloxysilyl group, and a sulfonyloxy group and containing neither active proton nor onium salt, X 1 to X 5 may be the same or different from each other and at least one of them is other than a hydrogen atom, R 1 to R 5 independently represent a single bond or a divalent hydrocarbon group having 1 to 18 carbon atoms, and a plurality of aziridine rings may be optionally bonded through any of X 1 to X 5 and R 1 to R 5 ; wherein the modified polymer has a peak molecular weight of 50,000 to 500,000, wherein the divalent hydrocarbon group having 1 to 18 carbon atoms of R 1 is selected from the group consisting of alkylene groups having 1 to 18 carbon atoms, alkenylene groups having 2 to 18 carbon atoms and aralkylene groups having 7 to 18 carbon atoms, and wherein the conditions of X 1 =a hydrogen atom and R 1 =a single bond are not simultaneously met.