Patent ID: 7459511
Filing Date: 2008-12-02
Classification: C08F,Y10S

Abstract:
1. A process for polymerizing 1-butene carrier out in liquid monomer, wherein the liquid monomer comprises liquid 1-butene, the process comprising the step of contacting, under polymerization conditions, 1-butene and optionally from 0 to 20% by mol of ethylene, propylene and/or an alpha olefins of formula CH 2 ═CHZ wherein Z is a C 3 -C 10 alkyl group, with a catalyst system obtained by contacting: a) a racemic or racemic-like bridged metallocene compound of formula (I) A, same or different, is a carbon atom, a germanium atom or a silicon atom; with the proviso that when m is 1, A is not a carbon atom; X, same or different, is a hydrogen atom, a halogen atom, or a R, OR, OSO L, same or different, is a moiety of formula (IIa) b) an alumoxane or a compound of formula D c) optionally an organo aluminum compound, wherein the process produces a polymer comprising more isotactic triads (mm) than syndiotactic triads (rr) and having an intrinsic viscosity higher than 1.0 dL/g.