Process for the preparation of polyolefins

Details Process for the preparation of polyolefins Process for the preparation of polyolefins

2006-07-04

2006-07-04

Nazario-Gonzalez, Porfirio (Department: 1621)

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

Organic compounds

Heavy metal containing

C556S022000, C556S038000, C556S043000, C556S053000, C556S058000, C526S127000, C526S160000, C526S943000, C502S103000, C502S117000

Reissue Patent

active

RE039156

ABSTRACT:
A process for the preparation of an olefin polymer by polymerization or copolymerization of an olefin of the formula Ra—CH═CH—Rb, in which Raand Rbare identical or different and are a hydrogen atom or a hydrocarbon radical having 1 to 14 carbon atoms or Raand Rb, together with the atoms connecting them, can form a ring, at a temperature of from −60° to 200° C., at a pressure of from 0.5 to 100 bar, in solution, in suspension or in the gas phase, in the presence of a catalyst formed from a metallocene in the meso-form or a meso:rac mixture, with meso:rac>1:99, as transition-metal compound and a cocatalyst, wherein the metallocene is a compound of the formula I,in which M1is Zr or Hf, R1and R2are identical or different and are methyl or chlorine, R3and R6are identical or different and are methyl, isopropyl, phenyl, ethyl or trifluoromethyl, R4and R5are hydrogen or as defined for R3and R6, or R4forms an aliphatic or aromatic ring with R6, or adjacent radicals R4form a ring of this type, and R7is aradical, and m plus n is zero or 1.

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