| 摘要 |
A catalyst having high activity independent of the hydrogen concentration and low gel productivity in the polymerization of ethylene has been prepared. The preparation comprises the steps of reacting: a support comprising a magnesium halide compound having the formula (1): RO2-nMgXn (1) wherein R is a C1-C20 alkyl, a C7-C26 aralkyl, a C1-C20 alkoxy or a C7-C26 aralkoxy, each same or different X is a halogen, and n is an integer 1 or 2, an alkyl metal halide compound having the formula (2): R<1>n<1>Mm<1>X<1>(3m<1>-n<1>) (2) wherein M is B or Al, each same or different R<1 >is a C1-C10 alkyl, each same or different X<1 >is a halogen, m<1 >is 1 or 2, n<1 >is 1 or 2 when m<1 >is 1 and n<1 >is an integer from 1 to 5 when m<1 >is 2, a magnesium composition containing magnesium bonded to a hydrocarbyl and magnesium bonded to a hydrocarbyl oxide, said magnesium composition having the empirical formula (3): R<2>n<2>(R<3>O)2-n<2>Mg (3) wherein each same or different R<2 >is a C1-C20 alkyl, each same or different R<3 >is a C1-C20 alkyl, n<2 >is between 0.01 and 1.99, and a titanium halide compound having the formula (4): (R<4>O)n<3>TiX<2>4-n<3> (4) wherein each same or different R<4 >is a C1-C20 alkyl, each same or different X<2 >is a halogen, n<3 >is 0 or an integer 1-3, and Ti is quadrivalent titanium.
|
