| abstract |
The present invention relates to a homogeneous process for the production of propylene copolymers, such as propylene ethylene copolymers, using transition metal complexes of dianionic tridentate ligands, characterized by a central neutral heterocyclic Lewis base and two phenate donors, three of which are The dentate ligands coordinate to the metal center to form two eight-membered rings. Preferably, the bis(phenate) complex is represented by formula (I), wherein M, L, X, m, n, E, E', Q, R 1 , R 2 , R 3 , R 4 , R 1 ' , R 2' , R 3' , R 4' , A 1 , A 1' , group (i) and group (ii) are as defined herein, wherein A 1 QA 1' is connected to A via a 3-atom bridge 2 and A 2' part of a Lewis base containing a heterocyclic ring of 4-40 non-hydrogen atoms, wherein Q is the central atom of a 3-atom bridge. |