| 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):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ RO 2-n MgX n €ƒ€ƒ€ƒ€ƒ€ƒ(1)
wherein R is a C 1 -C 20 alkyl, a C 7 -C 26 aralkyl, a C 1 -C 20 alkoxy or a C 7 -C 26 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):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ R 1 €Š n 1 M m 1 X 1 €Š (3m 1 -n 1 ) €ƒ€ƒ€ƒ€ƒ€ƒ(2)
wherein M is B or Al, each same or different R 1 is a C 1 -C 10 alkyl, each same or different X 1 is a halogen, m 1 is 1 or 2, n 1 is 1 or 2 when m €Š 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):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ R 2 €Š n 2 (R 3 O) 2-n 2 Mg€ƒ€ƒ€ƒ€ƒ€ƒ(3)
wherein each same or different R 2 is a C 1 -C 20 alkyl, each same or different R 3 is a C 1 -C 20 alkyl, n 2 is between 0.01 and 1.99, and
a titanium halide compound having the formula (4):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ (R 4 O) n 3 TiX 2 €Š 4-n 3 €ƒ€ƒ€ƒ€ƒ€ƒ(4)
wherein each same or different R 4 is a C 1 -C 20 alkyl, each same or different X 2 is a halogen, n 3 is 0 or an integer 1-3, and Ti is quadrivalent titanium. |
