Patent ID: 7157534
Filing Date: 2007-01-02
Classification: C08F,Y10S

Abstract:
1. A process for the preparation of a propylene polymer comprising polymerizing a mixture of: (a) propylene, and (b) a comonomer copolymerizable therewith which has molecular weight greater than propylene, wherein said comonomer is present in an amount of up to 10 mol % of the mixture of (a) and (b), wherein said polymerizing is a heterogeneous single site catalyst catalysed polymerization reaction comprising at least one stage, wherein at least one stage of said polymerization reaction is effected at least in part at a temperature of greater than 70° C. and is effected in propylene as reaction medium, and wherein said propylene polymer has a flow activation energy (Ea) of at least 43 kJ/mol.