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2. 发明授权

US6133385A Catalyst systems for improved stereoselectivity and broader molecular weight distribution in polymerization of olefins 失效
标题翻译：用于烯烃聚合中改进的立体选择性和较宽分子量分布的催化剂体系
公开(公告)号：US6133385A
公开(公告)日：2000-10-17
申请号：US223916
申请日：1994-04-06
申请人： Edwar S. Shamshoum , David John Rauscher , Douglas Alan Burmaster
发明人： Edwar S. Shamshoum , David John Rauscher , Douglas Alan Burmaster
IPC分类号： C08F4/646 , C08F4/649 , C08F4/658 , C08F10/00 , C08F4/64
CPC分类号： C08F10/00 , Y02P20/52
摘要： The present invention provides a catalyst system and a process for the polymerization of olefin that exhibits improved selectivity and broader molecular weight distribution in the polymer product. The catalyst system includes a conventional supported Ziegler-Natta catalyst in combination with a mixture of at least two electron donors, both having the general formula SiR.sub.m (OR').sub.4-m where R is selected from the group consisting of an alkyl group, a cycloalkyl group, an aryl group and a vinyl group; R' is an alkyl group; and m is 0-3, wherein when R is an alkyl group, R may be identical with R'; when m is 0, 1 or 2, the R' groups may be identical or different; and when m is 1, 2 or 3, the R groups may be identical or different. Preferably, one electron donor is described by the formula: ##STR1## wherein R.sub.1 and R.sub.4 are both an alkyl or cycloalkyl group containing a secondary or tertiary carbon atom attached to the silicon atom, R.sub.1 and R.sub.4 being the same;; R.sub.2 and R.sub.3 are alkyl or aryl groups, R.sub.2 and R.sub.3 being the same or different;and the other electron is described by the formula: ##STR2## wherein R'.sub.1 is an alkyl or cycloalkyl group containing at least one primary, secondary or tertiary carbon atom attached to the silicon atom, R'.sub.2 and R'.sub.3 are an alkyl or aryl group, R'.sub.2 and R'.sub.3 being the same or different; and R'.sub.4 is an alkyl group with a primary carbon attached to the silicon atom, R'.sub.1 and R'.sub.4 being the same or different. This catalyst system produces polypropylene having xylene solubles of 1-7 to 5.1 wt % and a molecular weight distribution of about 10.
摘要翻译：本发明提供一种催化剂体系和烯烃聚合方法，其在聚合物产物中表现出改善的选择性和较宽的分子量分布。催化剂体系包括与至少两个电子给体的混合物组合的常规负载齐格勒 - 纳塔催化剂，两者都具有通式SiRm（OR'）4-m，其中R选自烷基，环烷基，芳基和乙烯基; R'是烷基; 并且m为0-3，其中当R为烷基时，R可以与R'相同; 当m为0,1或2时，R'可以相同或不同; 当m为1,2或3时，R基团可以相同或不同。优选地，一个电子给体由下式描述：其中R1和R4都是含有与硅原子连接的仲或叔碳原子的烷基或环烷基，R1和R4相同; R2和R3是烷基或芳基，R2和R3相同或不同; 而另一个电子由下式描述：其中R'1是含有至少一个连接到硅原子上的伯，仲或叔碳原子的烷基或环烷基，R'2和R'3是烷基或芳基 R'2和R'3相同或不同; 并且R'4是具有连接到硅原子上的伯碳的烷基，R'1和R'4相同或不同。该催化剂体系产生具有1-7至5.1wt％的二甲苯可溶物和约10的分子量分布的聚丙烯。

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