Patent ID: 6569799
Filing Date: 2003-05-27
Classification: C08F,C08L,Y10S

Abstract:
Catalytic system for polymerization, comprising:an organometallic complex compound, which is represented by one of formula A or B: â€ƒin which Ln represents a metal of a lanthanide, the atomic number of which is between 57 and 71; X represents a halogen selected from the group consisting of chlorine, fluorine, bromine and iodine; wherein in formula A, two ligand molecules CPA, each a substituted cyclopentadienyl group having the formula (C5H4)(SiMe3), in which Me is methyl, are bonded to metal Ln; and in formula B, a ligand comprising two CpB molecules, bonded to one another by a bridge P, is bonded to metal Ln, wherein CpB is a substituted cyclopentadienyl having (C5H4)(SiMe3), in which Me is methyl, or an unsubstituted fluorenyl group having the formula C13H8 and P corresponds to formula MR2, in which M is an element in column IVA of Mendeleev's periodic classification, and R is an alkyl group having 1 to 20 carbon atoms; and a co-catalyst selected from the group consisting of a magnesium alkyl, a lithium alkyl, an aluminium alkyl, a Grignard's reagent, and mixtures thereof.