发明授权
- 专利标题： Multi-stage process for the polymerization of olefins
- 专利标题（中）： 用于烯烃聚合的多阶段方法
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申请号： US09265036申请日： 1999-03-09
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公开(公告)号： US06262195B1公开(公告)日： 2001-07-17
- 发明人: Tiziano Dall'Occo , Giovanni Baruzzi , Colin J. Schaverien
- 申请人： Tiziano Dall'Occo , Giovanni Baruzzi , Colin J. Schaverien
- 优先权： EP98200729 19980309
- 主分类号： C08F442
- IPC分类号： C08F442
摘要：
A multi-stage process for preparing ethylene (co)polymers having broad molecular weight distributions is disclosed, said process comprising: (A) a first polymerization stage in which, in the presence of a Ti or V catalyst, a first ethylene polymer is prepared; (B) a treatment stage in which the catalyst used in the first stage is deactivated and in which a bridged bis-2-indenyl zirconocene is supported on the ethylene polymer produced in stage (A), optionally in the presence of a suitable cocatalyst; and (C) a second polymerization stage in which ethylene is polymerized in the presence of the product obtained from stage (B). Furthermore, polyethylene obtainable by the above process is disclosed, having intrinsic viscosity ranging from 0.5 to 6 dl/g, Mw/Mn>8 and cold xylene solubility