Halogenated organometallic complexes and their use in the polymerization of unsaturated monomers
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United States of America Patent
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May 27, 1997
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Aug 1, 1994
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Aug 6, 1993
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Abstract
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)(AlX.sub.3 R).sub.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.
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