Patent ID: 7829642
Filing Date: 2010-11-09
Classification: C08F

Abstract:
1. A method of producing an isoprene-based polymer that is an isotactic-rich 3,4 polyisoprene, comprising polymerizing an isoprene-based compound represented by Formula (X) using a polymerization catalyst comprising a complex represented by Formula (A) and a catalyst activator: wherein each of R R 3 represents an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an aralkyl group, an aliphatic, aromatic, or cyclic amino group, a phosphino group, a boryl group, an alkylthio or arylthio group, or an alkoxy arloxy group, M represents a rare earth element selected from the group consisisting of scandium (Sc), yttrium (Y), and lanthanum (La) to lutetium (Lu) with promethium (Pm) excluded; each of Q L represents a neutral Lewis base; and w represents an integer of 0 to 3; wherein R