发明申请
- 专利标题: Bimetallic catalyst, method of polymerization and bimodal polyolefins therefrom
- 专利标题(中): 双金属催化剂,聚合方法和双峰聚烯烃
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申请号: US11641254申请日: 2006-12-19
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公开(公告)号: US20070123414A1公开(公告)日: 2007-05-31
- 发明人: Sun-Chueh Kao , Michael Awe
- 申请人: Sun-Chueh Kao , Michael Awe
- 申请人地址: US TX Houston
- 专利权人: UNIVATION TECHNOLOGIES, LLC
- 当前专利权人: UNIVATION TECHNOLOGIES, LLC
- 当前专利权人地址: US TX Houston
- 主分类号: C08F4/02
- IPC分类号: C08F4/02 ; C08F4/44
摘要:
Bimetallic catalysts, and methods of producing a bimetallic catalyst comprising a modified Ziegler-Natta catalyst and a metallocene are provided, in one embodiment the method including combining: (a) a Ziegler-Natta catalyst comprising a Group 4, 5 or 6 metal halide and/or oxide, optionally including a magnesium compound, with (b) a modifier compound (“modifier”), wherein the modifier compound is a Group 13 alkyl compound, to form a modified Ziegler-Natta catalyst. Also provided is a method of olefin polymerization using the bimetallic catalyst of the invention. The modified Ziegler-Natta catalyst is preferably non-activated, that is, it is unreactive towards olefin polymerization alone. In one embodiment, the molar ratio of the Group 13 metal (of the modifier) to the Group 4, 5 or 6 metal halide and/or oxide is less than 10:1 in one embodiment. The bimetallic catalysts of the present invention are useful in producing bimodal polymers, particularly bimodal polyethylene, having a Polydispersity (Mw/Mn) of from 12 to 50. These bimodal polyolefins are useful in such articles as pipes and films.