Process for the polymerization of 1-butene

Details Process for the polymerization of 1-butene Process for the polymerization of 1-butene

2008-10-22

2011-10-04

Lee, Rip A. (Department: 1762)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S170000, C526S348600, C526S941000, C526S943000, C526S126000, C526S127000

Reexamination Certificate

active

08030421

ABSTRACT:
A process for polymerizing 1-butene comprising the step of contacting under polymerization conditions 1-butene and optionally from 0 to 20% by mol of an alpha olefin with a catalyst system obtainable by contacting a bridged metallocene compound of formula (I)wherein R1and R2are an hydrocarbon radical A is a carbon atom, a germanium atom or a silicon atom; m is 1, 2; M is a metal of group 4 of the Periodic Table of the Elements; X, is hydrogen, a halogen atom, or a group R, OR, OSO2CF3, OCOR, SR, NR2or PR2, wherein the substituents R are hydrocarbon radical; L is a moiety of formula (IIa) or (IIb)whereinT is an oxygen (O) or sulphur (S) atom or a CH2group; and R3and R4are hydrogen atoms or hydrocarbon radicals; one or more alumoxanes or compounds able to form an alkylmetallocene cation; and optionally an organo aluminum compound.

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