ETHENE POLYMERIZATION WITH MODIFIED-POLYPROPENE-SUPPORTED HIGHLY STABLE ZIEGLER CATALYST

A modified-polypropene-supported Ziegler catalyst was prepared using p olypropene containing a small amount of poly(7-methyl-1,6-octadiene) a s a starting polymer for bromination, lithiation, and reaction with Ti Cl4. The polymerization of ethene was carried out using the catalyst w ith Al(C2H5)(3) in toluene at 60 degrees C up to 100 h. The polymer yi eld increased linearly with polymerization time, which indicates that the active sites of the modified-polypropene-supported Ziegler catalys t are practically stable without deactivation even for 100 h and are a ble to propagate further polymerization of ethene.