Supported metallocene catalyst and the preparation process thereof

摘要

A supported metallocene catalyst, comprising (a) a metallocene • ethers • inorganic salt adduct having a general formula, Cp'2MQ2 • Et • nM'Q2/n, (b) an alkylaluminoxane and (c) a silica carrier, where in said adduct formula, Cp' is a ligand having a cyclopentadiene skeleton, M is any one of elements selected from Group IVB in Period Table of Element; Q is halogen; Et is an ether or tetrahydrofuran; M' is selected from alkali metal or alkali earth metal, n is 1 or 2, said supported catalyst has an average particle diameter of 20-40 mu m, wherein the amount of the particles having diameter smaller than 10 mu m is less than 10wt%, having diameter greater than 70 mu m is less than 30 wt%, and having diameter between 20 and 70 mu m is 45 SIMILAR 65 wt%. The supported metallocene catalyst is suitable for polymerization of olefins, which is able to effectively reduce polymer fouling and contaminating phenomena to autoclave in the continuous process of polymerization.