| 摘要 |
Ethylene or a mixture of ethylene with an alpha -olefin having at least 3 carbon atoms is polymerized under a pressure of at least 200 kg/cm<2> at a temperature of at least 125 DEG C in the presence of a catalyst formed from (A) a solid catalyst component and (B) an organic aluminum compound of the formula: R<4>nAIX<2>3-n wherein R<4> is C1-6 alkyl, X<2> is halogen and n is from 1.5 to 3. The solid catalyst component is prepared by (1) reacting an aluminum halide with a silicon compound of the formula: R<1>mSi(OR<2>)4-m wherein R<1> is C1-8 alkyl or phenyl, R<2> is C1-8 alkyl and m is 0, 1, 2 or 3, (2) reacting the obtained product with a Grignard compound of the formula: R<3>MgX<1> wherein R<3> is C1-8 alkyl and X<1> is halogen, to form a carrier, and then, (3) contacting the carrier with a titanium tetrahalide. |
