| abstract |
PROBLEM TO BE SOLVED To provide a polymer of a conjugated diene, which provides a controllable level of cis-, trans- and 1,2-vinyl without the need for a post-reactor blend. The diene polymerization monomer comprises (A) a first transition metal compound selected from Cr, Mo and W compounds, and a second transition metal compound selected from Fe, Co and Ni compounds, and (B) a catalyst modification. Process for the production of homopolymers or copolymers of conjugated dienes by polymerizing with a catalyst system containing a quality agent (eg triphenylphosphine) and optionally (C) one or more catalytic activators (eg MAO) And catalyst. The cis, trans and 1,2-vinyl microstructure of the diene polymer produced can be controlled. [Selection figure] None |