Patent ID: 6469110
Filing Date: 2002-10-22
Classification: B01J,C08F,C08L,Y10S

Abstract:
A process for preparing a propylene polymer selected from the group consisting of homopolymers of propylene, copolymers of propylene and alloys of propylene homopolymers and copolymers having different molar mass and comonomer distribution, which comprises the steps of:polymerizing propylene optionally with comonomers in the presence of a catalyst at an elevated temperature of at least 60Â° C. and at an elevated pressure in at least one slurry reactor and at least one gas phase reactor, at least 10% of the polymer product being produced in the gas phase reactor(s), recovering from the slurry reactor a polymerization product containing unreacted monomers, separating volatile components from the product in a separation unit, recovering the polymerization product from the separation unit and conducting it to a first gas phase reactor, and recovering at least a part of the volatile components from the separation unit and conducting them to a first gas phase reactor essentially without recycling unreacted monomers to the slurry reactor.