Patent ID: 7799880
Filing Date: 2010-09-21
Classification: C08F,C08L,Y10S

Abstract:
1. A multistep process comprising the following steps: step a) polymerizing propylene and optionally at least one monomer selected from ethylene or alpha olefins of formula CH step b) contacting, under polymerization conditions, propylene or ethylene with at least one alpha olefin of formula CH wherein the amount of the polymer obtained in step a) ranges from 5% by weight to 39% by weight of the polymer obtained in the whole process, and the amount of polymer obtained in step b) ranges from 61% by weight to 95% by weight of the polymer obtained in the whole process; wherein in the compound of formula (I), M is an atom of a transition metal selected from those belonging to group 4 of the Periodic Table of the Elements; X, equal to or different from each other, is a hydrogen atom, a halogen atom, an R, OR, OR′O, OSO L is a divalent bridging group selected from C R R R W is an aromatic 5 or 6 membered ring that can contain heteroatoms belonging to groups 15-16 of the Periodic Table of the Elements, the valence of each atom of said ring is substituted with hydrogen atom or it can optionally be substituted with R R