Abstract: Conjugated diene polymer comprising at least a conjugated diene monomer unit, the conjugated diene polymer has a number-average molecular weight (Mn) in terms of polystyrene of 1,000 to 1,000,000, a ratio (Mw/Mn) of a weight-average molecular weight (Mw) to the number-average molecular weight (Mn) of lower than 2.0 and the polymer bears a halogen atom at a terminal of the polymer chain. Method for producing the conjugated diene polymer comprises subjecting a monomer containing at least a conjugated diene to living radical polymerization using a polymerization initiator comprising a halogenocyclopentadienyl triorganophosphine ?2-olefin ruthenium complex represented by formula (6) (and an organic halide.

Abstract: Conjugated diene polymer comprising at least a conjugated diene monomer unit, the conjugated diene polymer has a number-average molecular weight (Mn) in terms of polystyrene of 1,000 to 1,000,000, a ratio (Mw/Mn) of a weight-average molecular weight (Mw) to the number-average molecular weight (Mn) of lower than 2.0 and the polymer bears a halogen atom at a terminal of the polymer chain. Method for producing the conjugated diene polymer comprises subjecting a monomer containing at least a conjugated diene to living radical polymerization using a polymerization initiator comprising a halogenocyclopentadienyl triorganophosphine ?2-olefin ruthenium complex represented by formula (6) (and an organic halide.

Abstract: Conjugated diene polymer comprising at least a conjugated diene monomer unit, the conjugated diene polymer has a number-average molecular weight (Mn) in terms of polystyrene of 1,000 to 1,000,000, a ratio (Mw/Mn) of a weight-average molecular weight (Mw) to the number-average molecular weight (Mn) of lower than 2.0 and the polymer bears a halogen atom at a terminal of the polymer chain. Method for producing the conjugated diene polymer comprises subjecting a monomer containing at least a conjugated diene to living radical polymerization using a polymerization initiator comprising a halogenocyclopentadienyl triorganophosphine ?2-olefin ruthenium complex represented by formula (6) (and an organic halide.

Abstract: Conjugated diene polymer comprising at least a conjugated diene monomer unit, the conjugated diene polymer has a number-average molecular weight (Mn) in terms of polystyrene of 1,000 to 1,000,000, a ratio (Mw/Mn) of a weight-average molecular weight (Mw) to the number-average molecular weight (Mn) of lower than 2.0 and the polymer bears a halogen atom at a terminal of the polymer chain. Method for producing the conjugated diene polymer comprises subjecting a monomer containing at least a conjugated diene to living radical polymerization using a polymerization initiator comprising a halogenocyclopentadienyl triorganophosphine ?2-olefin ruthenium complex represented by formula (6) (and an organic halide.

Abstract: A method for easily and efficiently removing ruthenium complexes, which are generally difficult to remove, from a polymer, as well as a method for purifying a polymer that uses such a removal method are provided. A method for removing a metal, wherein a compound is added that is capable of coordination via a substitution of a ligand of a ruthenium complex, thereby precipitating another ruthenium complex, as well as a method for purifying a polymer that uses such a method.

Abstract: A method for easily and efficiently removing ruthenium complexes, which are generally difficult to remove, from a polymer, as well as a method for purifying a polymer that uses such a removal method are provided. A method for removing a metal, wherein a compound is added that is capable of coordination via a substitution of a ligand of a ruthenium complex, thereby precipitating another ruthenium complex, as well as a method for purifying a polymer that uses such a method.

Abstract: A process for preparing a three-branched or four-branched star compound comprising polymerizing an olefine compound represetned by the formula ##STR1## wherein A is a signle bond or phenylene group, and R.sup.3 is a hydrogen atom or methyl group and R.sup.4 is a monovalent organic group when A is a signle bond, or R.sup.3 is a hydrogen atom and R.sup.4 is an alkyl group when A is a phenylene group, using the adduct of a polyfunctional alkenyl ether represetned by the formula (I)R.sup.2 --O--CH.dbd.CHR.sup.1).sub.n (I)wherein R.sup.1 is a hydrogen atom or methyl group, n is an integer of 3 or 4, and R.sup.2 is a rtivalent organic group when n is 3 or a tetravelent organic group when n is 4 with a cation-donating compound.

Abstract: A process for preparing reactive polymers and polymers prepared by the foregoing process are disclosed. This process comprises polymerizing a monomer comprising at least one isopropenylphenyl glycidyl ether represented by formula (1): ##STR1## wherein all the symbols are defined in the appended claims, or in combination with at least one other unsaturated monomer, by the use of a catalyst selected from halogens and hydrogen iodide. The reactive polymer prepared by the above process is represented by the general formula (2): ##STR2## wherein all the symbols are defined in the appended claims, and has a number average molecular weight of 500 to 50,000.