HALOGENATED COMPLEXES OF LANTHANIDES AND THEIR USE IN THE POLYMERIZATION OF UNSATURATED MONOMERS

摘要

Organometallic complexes of lanthanides with a well-defined stoichiometry which can be used in the stereospecific polymerization of unsaturated monomers, can be represented by the general formula: Me(Ar) (AlX3R)3 (1) wherein; Me represents a metal with atomic number 21, 39, or an atomic number of between 57 and 71, Ar represents benzene or a susbstituted benzene with from 1 to 3 alkyl groups containing from 1 to 10 carbon atoms, X is a halogen atom, whereas R is a linear, cyclic or branched alkyl radical containing from 1 to 12 carbon atoms. The preparation of the complexes is described together with their use in the stereospecific copolymerization of unsaturated monomers.