| 摘要 |
A magnesium halide composition is obtained by contacting a magnesium halide with a non-metallic halide such as thionyl chloride and a compound R<1>OH such as phenol, optionally with a Lewis Base compound such as an ester, for example by grinding all these materials together. Alternatively, the non-metallic halide and the compound R<1>OH may be prereacted, for example to give benzene sulphonic acid chloride, and the reaction product contacted with the magnesium halide. The magnesium halide composition obtained may then be treated with a titanium tetrachloride-containing material, preferably undiluted titanium tetrachloride. The treatment with titanium tetrachloride may be repeated. The solid product of treatment with titanium tetrachloride can be washed at least once. The product obtained by treatment with titanium tetrachloride may be combined with an organic metal compound such as aluminium triethyl and preferably a Lewis Base such as ethyl benzoate or an organic silicon compound to give olefin polymerisation catalyst. When used to polymerise propylene, the polymer product obtained is highly stereoregular and the level of residual catalyst is low. |
