Patent ID: 6399727
Filing Date: 2002-06-04
Classification: C08F

Abstract:
A polymerization initiator comprising an alkaline earth metal compound chosen from the groupa) of heteroleptic alkaline earth metal compounds of the formula I Lâ€”Mâ€”Râ€ƒâ€ƒ(I) â€ƒor b) of cationic alkaline earth metal complexes of the formula II [Dâ†’Mâ€”R]+Xâˆ’â€ƒâ€ƒ(II), â€ƒwhere M: is Ca, Sr or Ba, L: is a polymerization-inactive ligand, R: is a carbanion as polymerization-active ligand, D: is a donor ligand, and X: is a non-coordinating anion.