Patent ID: 9346907
Filing Date: 2016-05-24
CPC Classification: C08F,Y10S

Claim Text:
1. A method for producing a copolymer characterized by comprising a step of polymerizing a conjugated diene compound and an olefin in the presence of a polymerization catalyst composition comprising at least one complex selected from the group consisting of a metallocene complex represented by the following general formula (II): wherein M in the general formula (II) is a lanthanoid element, scandium or yttrium, and Cp and a half-metallocene cation complex represented by the following general formula (III): wherein M in the general formula (III) is a lanthanoid element, scandium or yttrium, and Cp wherein the cis-1,4 bond content of the conjugated diene compound portion in the copolymer is not less than 85%, wherein when the conjugated diene compound is polymerized with the olefin, a concentration of the conjugated diene compound (mol/l) and a concentration of the olefin (mol/l) at the starting of the polymerization satisfy a relation of the following equation: concentration of olefin/concentration of conjugated diene compound ≧1.3, and wherein a content of the olefin in the copolymer is a range of 10-50 mol %.