| abstract |
A process compri sing polymerizing propylene and an olefin comonomer selected from C 2 or C 4 - C 8 with a Ziegler Natta catalyst system and hydrogen in a single gas-phase reactor, to form a propylene polymer, at a temperature range of from 78 to 92°C with a H 2 /C 3 molar ratio of 0.005 to 0.25, the catalyst system comprising: a solid catalyst component comprising a transition metal compound, a Group 2 metal compound, an internal electron donor comprising a substituted phenylene aromatic di ester; an activity limiting agent; an organo-aluminum compound; and an external electron donor composition comprising at least one silane, wherein if the olefin comonomer is ethylene it is present in the propylene polymer in an amount from 1.0-7.0 wt% based on the total weight of the propylene polymer, and if the olefin comonomer is C 4 -C 8 , it is present in an amount from 1,0-15,0 mol% based on the total amount of the propylene polymer. |