Process for the copolymerization of ethylene

Details Process for the copolymerization of ethylene Process for the copolymerization of ethylene

2003-09-10

2009-08-04

Wu, David (Department: 1796)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S170000, C526S943000, C526S941000, C526S127000, C526S348000, C526S348200, C526S348500, C526S348600, C526S339000, C526S340300

Reexamination Certificate

active

07569647

ABSTRACT:
A process for producing a copolymer of ethylene containing from 0.1 to 99% by mol of one or more derived units of alpha-olefins of formula CH2═CHA, wherein A is a C2-C20alkyl radical, comprising contacting, under polymerization conditions, ethylene and one or more alpha-olefins in the presence of a catalyst system obtainable by contacting: a) a metallocene compound of formula (I): wherein M is zirconium, titanium or hafnium; X, same or different, is a hydrogen atom, a halogen atom, or an hydrocarbon group; R1, is a hydrocarbon group; R2R3, R4, R5 and R6, are hydrogen atoms or hydrocarbon groups; Q is a radical of formula (II), being bonded to the indenyl at the position marked by the symbol *; (II) wherein: T1, T2, T3, T4and T5, are carbon atoms (C) or nitrogen atoms (N); m1, m2, m3, m4and m5are 0 or 1; R7, R8, R9, R10and R11are hydrogen atoms or hydrocarbon groups; and b) an alumoxane or a compound capable of forming an alkyl metallocene cation.

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