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)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C502S103000, C502S152000, C526S126000, C526S132000, C526S134000, C526S160000, C526S335000, C526S348000, C526S943000, C556S007000, C556S008000, C556S011000, C556S012000

Reexamination Certificate

active

08071700

ABSTRACT:
A borohydride metallocene complex of a lanthanide, its process of preparation, a catalytic system incorporating a borohydride metallocene complex and a process for the copolymerization of olefins employing this catalytic system. Such a complex corresponds to one or other of the following formulae A and B:where, in the formula A, two ligands Cp1and Cp2, each composed of a cyclopentadienyl group, are connected to the lanthanide Ln, such as Nd, and where, in the formula B, a ligand molecule, composed of two cyclopentadienyl 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, where p is an integer equal to or greater than 1 and where y is an integer which is equal to or greater than 0.

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