Patent ID: 7728086
Filing Date: 2010-06-01
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, in a gas phase, 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 90% by weight of the polymer obtained in the whole process, and the amount of polymer obtained in step b) ranges from 10% 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