Process for the production of propylene copolymers

C - Chemistry – Metallurgy – 08 – F

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C08F 297/08 (2006.01) C08F 2/00 (2006.01) C08F 210/06 (2006.01)

Patent

CA 2600362

The properties and the amounts of polymers produced in the second stage of a polymerization process in the presence of propylene and ethylene or other alpha olefin are controlled by the addition of an external electron donor to the second stage polymerization. The dosage of external donor to the second stage polymerization is based on a percentage of the dosage of external donor to a first stage polymerization of propylene in the process. The external donor added to the second stage is either the same as or different from the external donor added to the first stage.

Les propriétés et les quantités de polymères produits dans le second étage d'un processus de polymérisation en présence de propylène et d'éthylène ou d'une autre alpha-oléfine, sont régulés par apport d'un donneur d'électrons externe au cours de la polymérisation du second étage. Le dosage du donneur externe introduit dans la polymérisation du second étage est basé sur un pourcentage du dosage du donneur externe introduit dans la polymérisation de propylène du premier étage dans le processus. Le donneur externe ajouté au second étage est soit un donneur identique soit un donneur différent du donneur externe ajouté dans le premier étage.

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