Patent ID: 7442743
Filing Date: 2008-10-28
Classification: C08F,Y10T

Abstract:
1. A process for the production of a propylene polymer in a multistage polymerisation process comprising the polymerisation of propylene in the presence of a catalyst in a first reaction zone comprising at least one slurry reactor to give a first polymerisation product, transferring said first product to a second reaction zone comprising at least one gas phase reactor and continuing polymerisation of propylene in the gas phase in the presence of said first polymerisation product characterised in that the temperature in both the slurry and the gas phase reactor is at least 75° C. and the product of at least one reactor has an ethylene content in the range of 0.05 to 0.5 wt % and the polypropylene polymer has a xylene solubles content of 3.0 wt. % or less and a maximum in its temperature rising elution fractionation (TREF)-function at 120° C. or less.