发明名称 |
PREPARATION OF POLYOLEFINS HAVING HIGH MOLECULAR WEIGHTS IN THE PRESENCE OF AN ORGANIC TRANSITION METAL COMPOUND IN A GAS-PHASE FLUIDIZED-BED REACTOR |
摘要 |
<p>Process for preparing polyolefins having high molecular weights in the presence of a catalyst comprising an organic transition metal compound in a gas-phase fluidized-bed reactor, where the polyolefins prepared have a melt flow rate at 2.16 kg and 190° C. in accordance with ISO 1133 of less than 4 g/10 min. According to the present invention, a start-up phase during which a polyolefin having an increased melt flow rate of above 4 g/10 min is produced for a transitional period is provided. In this way, trouble-free start-up of the reactor is ensured even in the case of polymer products having a high molecular weight and a melt flow rate below 4 g/10 min and even when using catalysts based on organic transition metal compounds, in particular metallocene catalysts.</p> |
申请公布号 |
EP1608690(B1) |
申请公布日期 |
2007.06.13 |
申请号 |
EP20040725023 |
申请日期 |
2004.04.01 |
申请人 |
BASELL POLYOLEFINE GMBH |
发明人 |
KOEPPL, ALEXANDER;KARER, RAINER;NIEKEN, ULRICH |
分类号 |
C08F210/16;C08F2/00;C08F2/38 |
主分类号 |
C08F210/16 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|