Polymerization of propylene with bridged and unbridged indenyl derivatives of zirconium
Polimery 1997, No 10, 599
The kinetics of propene polymerization in the liquid monomer medium and the properties of the resulting zso-PP were studiedin relation to the in teran nularbridge nature, (CH2)2lnd2ZrCl2 (I), Me2SiInd2ZrCl2 (II), Me2ClInd2ZrCl2 (III), and asymmetric Me(c-C3H5)ClInd2ZrCl2 (IV), in MAO-activated 1,1-bridgedbisindenyl zirconocene dichlorides. Data are also given for the non-bridged (2-Ph-C9Hg)2ZrCl2 (V) system used under similar conditions.The systems based on zirconocene III are most active and that based on II is most stable. The replacement of one methyl group in the (СН3) С < bridge by acyclopropyl group (compounds III an d IV) results in the depressed initial activity and in the greater deactivation of the system during the process of polymerization. The stereo block polymer was formed with the catalyst system based on metallocene V, used under similar experimental conditions.