发明授权
- 专利标题: Method for controlling the melting points and molecular weights of syndiotactic polyolefins using metallocene catalyst systems
- 专利标题(中): 使用茂金属催化剂体系控制间同立构聚烯烃的熔点和分子量的方法
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申请号: US903058申请日: 1992-06-22
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公开(公告)号: US5710222A公开(公告)日: 1998-01-20
- 发明人: John A. Ewen , B. R. Reddy , Michael J. Elder
- 申请人: John A. Ewen , B. R. Reddy , Michael J. Elder
- 申请人地址: TX Dallas
- 专利权人: Fina Technology, Inc.
- 当前专利权人: Fina Technology, Inc.
- 当前专利权人地址: TX Dallas
- 主分类号: C08F4/642
- IPC分类号: C08F4/642 ; C07F17/00 ; C08F4/60 ; C08F4/612 ; C08F4/619 ; C08F4/6192 ; C08F4/622 ; C08F4/6392 ; C08F4/64 ; C08F4/659 ; C08F4/6592 ; C08F8/00 ; C08F10/00 ; C08F110/06
摘要:
This invention is for a method for varying the melting points and molecular weights of syndiotactic polyolefins by using metallocene catalysts with substituents on the aryl rings of a fluorene ligand in certain positions. Electron donating substituents, for example, dialkylamino, halogen, and alkoxy groups, when present on fluorene at C1, C2, C3 or C2 and C7 render the catalyst less active and decrease the polymer molecular weight. Electron donating substituents, such as alkyl, dialkylamino, halogen or alkoxy, at C4 not only increased the catalyst efficiency but also dramatically increased the polymer molecular weight. Bulky hydrocarbyl substituents, such as alkyl, cyaloalkyl and aryl groups, at C2 and C7 increase the melting point. Bulky substituents such as hydrocarbyl groups like alkyl, cycloalkyl, aryl, alkoxy and dialkylamino groups etc., at C4/C5 decrease the melting point. When multiple substituents are present on fluorene, their effects are additive.
公开/授权文献
- US5939465A Photopolymerizable composition 公开/授权日:1999-08-17