| 摘要 |
PURPOSE: A preparation method of supported catalyst for polymerizing ethylene and copolymerizing ethylene/alpha-olefin is provided to give polymer having particle size adjusted to narrow range, broad molecular weight distribution, and increased apparent density, and produce catalyst having high activity in the slurry and vapor polymerization. CONSTITUTION: The method comprises reacting organic magnesium compound having composition of MgPh2.nMgCl2.mR2O(wherein, Ph="phenyl"; n="0.37-0.7"; m is at least one; R2O="ether"), and mixture of organic chlorine compound and silicone compound at temperature of -20 to 80deg.C, and treating the resulting carrier with vanadium compound alone or in combination with titanium compound. In the reaction, the mole ratio of organic chlorine compound/Mg is at least 0.5, and the mole ratio of silicone compound/Mg is at least 0.001. Thus the obtained catalyst has narrow particle size, broad molecular weight distribution, and increased apparent density.
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