Method for preparing a catalyst suitable for polymerizing an olefin
Патенты
| Язык: |
Английский |
| Тип: |
Патент на изобретение |
| Номер (11) |
US 6268306 B1 |
| Номер заявки (21): |
09/524,515 |
| Дата подачи заявки (22): |
13 мар. 2000 г. |
| Дата начала отсчета срока действия патента (24): |
|
| Дата публикации патента (44,45,46): |
31 июл. 2001 г. |
| Дата публикации заявки (43): |
|
A polymerization catalyst obtained by contacting metallic magnesium with an aromatic halide, RX, under conditions effective to obtain a first reaction product and solid residual products is disclosed. The first reaction product is then separated from the solid residual products. A silane compound containing an alkoxy or aryloxy group is added to the first reaction product between -20 DEG C. to 20 DEG C. to obtain a precipitate which is purified to obtain a second reaction product. Subsequently, the second reaction product is contacted with a halogenized titanium compound, such as, titanium tetrachloride, to obtain a further reaction product. The polymerization catalyst is obtained by purifying the further reaction product. In the aromatic halide, R represents an aromatic group containing from 6 to 20 carbon atoms and X represents a halide. An electron dopor such as dibutyl phthalate may also be present during the titanium addition.