Borohydride metallocene complex of a lanthanide, catalytic...

Details Borohydride metallocene complex of a lanthanide, catalytic... Borohydride metallocene complex of a lanthanide, catalytic...

2006-10-31

2011-12-06

Lu, Caixia (Department: 1765)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heavy metal containing

C556S008000, C556S011000, C556S012000, C526S126000, C526S132000, C526S134000, C526S160000, C526S164000, C526S335000, C526S348000, C526S943000, C502S103000, C502S152000

Reexamination Certificate

active

08071800

ABSTRACT:
A borohydride metallocene complex of a lanthanide, its process of preparation, a catalytic system incorporating it, a process for the copolymerization of olefins employing this catalytic system and an ethylene/butadiene copolymer obtained by this process, the butadiene units of which comprise 1,2-cyclohexane or 1,2- and 1,4-cyclohexane links. This complex corresponds to one or other of the following formulaeAandB:where, in the formulaA, two ligand molecules Cp1and Cp2, each composed of a fluorenyl group, are connected to the lanthanide Ln, such as Nd, and where, in the formulaB, a ligand molecule, composed of two fluorenyl groups Cp1and Cp2which are connected to one another via a bridge P of formula MR1R2, where M is an element from group IVa, such as Si, and where R1and R2, which are identical or different, represent an alkyl group comprising from 1 to 20 carbon atoms, is connected to the lanthanide Ln, where L represents an alkali metal, such as Li, where N represents a molecule of a complexing solvent, such as THF, where x is an integral or non-integral number greater than 0 and where p is an integer equal to or greater than 1.

REFERENCES:
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