摘要:
The present invention relates to a new catalyst based on allyl complexes of the rare earths, of general formula [(C3R15)rM1(X)2−r(D)n]+[M2(X)p(C6H5−qR2q)4−p]− (I), to the preparation of this new catalyst, and to its use for the polymerization of unsaturated compounds, particularly of conjugated dienes, in solution and in the gas phase.
摘要:
A process for polymerizing a gaseous conjugated diene by bringing it in contact with a catalyst consisting of a rare earth allyl compound, an organic aluminum compound, an inorganic support and optionally, the same or a different conjugated diene. The resulting polymers possess elevated proportions of cis-1,4 units.