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Polymerization of propylene by mixed Ziegler–Natta and metallocene catalysts

✍ Scribed by Anatoli Lisovskii; Michael Shuster; Michael Gishvoliner; Gershon Lidor; Moris S. Eisen

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
126 KB
Volume
12
Category
Article
ISSN
0268-2605

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✦ Synopsis

The polymerization of propylene using a mixture of racemic metallocenes and Ziegler-Natta catalysts was investigated. The polypropylene was obtained as a mixture of a fine powder and beads, with the powder being absorbed partially on the beads. The relative amount of the powder can be controlled by the concentration of the metallocene. The compatibility between the components of the mixed catalytic systems and the effect of the components on the rate of polymerization and on the properties of the new polymers were studied. The metallocene system dramatically affects the melt viscosity, isotacticity and molecular weight of the polymers. The two catalytic systems are able to act jointly, producing different polymers, for which separate melting and crystallization temperatures are obtained.

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