摘要:
Bis(di-, tri- or tetra-substituted-cyclopentadienyl)zirconium dihalides represented by the following general formula [I] are provided, ##STR1## (wherein R.sup.1 denotes a substituent group on the cyclopentadienyl ring which is an alkyl radical of 1 to 5 carbon atoms; R.sub.2.sup.1 --C.sub.5 H.sub.3 stands for a di-substituted cyclopentadienyl radical; and X is a halogen atom).This compound, when combined with an aluminoxane repesented by the following general formula [VII], gives a high-activity catalyst for the synthesis of polyolefins, ##STR2## (wherein m is an integer of 4 to 20; and R.sup.2 denotes a hydrocarbyl radical).
摘要:
A carrier for olefin polymerization catalysts (or catalyst components) which is in spherical form and has a narrow particle size distribution is produced by reacting an anhydrous magnesium dihalide with an alcohol or a phenol in an inert organic solvent to obtain a complex compound; suspending this complex compound with vigorous stirring in the presence of a nonionic surfactant in an inert organic solvent at the melting point of the complex compound or higher; and adding an organoaluminum compound or a silicon halide to the suspension to react them to thereby form spherical solids.