| 摘要 |
A process for the polymerization of ethylene using as the catalyst a novel solid catalytic complex comprising Mg, Si, and either Ti or V. An organoaluminum co-catalyst is also employed. The novel catalytic complex is prepared by a process which comprises: (a) reacting a silanol having the formula <IMAGE> where R, R' and R'' can be the same or different and are selected from the group consisting of aliphatic hydrocarbons having from 2 to 12 carbon atoms or phenyl or substituted phenyl where such substituents have from one to three alkyl groups, and alkyl group having from one to four carbon atoms and where R'' can additionally be selected from -OH, with a magnesium dialkyl where each alkyl group can have from one to 12 carbon atoms to form a first reaction product; (b) reacting said first reaction product with trichlorosilane to form a second reaction product; and (c) reacting said second reaction product with a metal compound having the formula: MeX4 where Me can be titanium or vanadium and wherein X is chlorine, bromine, or -OH1 where R1 is a hydrocarbon radical having from 1 to 10 carbon atoms and wherein at least two of the X substituents are selected from chlorine and bromine to form the desired catalytic complex, and wherein said catalytic complex the molar ratio of Me to Si is from about 0.33:1 to 11:1 and wherein the molar ratio of Me to Mg is from 0.33:1 to 11:1.
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