发明授权
US08445599B2 Multi-stage process for producing polyethylene with lowered gel formation
有权
用于生产低凝胶形成的聚乙烯的多阶段方法
- 专利标题： Multi-stage process for producing polyethylene with lowered gel formation
- 专利标题（中）： 用于生产低凝胶形成的聚乙烯的多阶段方法
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申请号： US13129800申请日： 2009-10-16
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公开(公告)号： US08445599B2公开(公告)日： 2013-05-21
- 发明人: Bill Gustafsson , Jari Hatonen , Petri Rekonen , Markku Vahteri , Siw Bodil Fredriksen , Arild Follestad , Karl Isak Skau
- 申请人： Bill Gustafsson , Jari Hatonen , Petri Rekonen , Markku Vahteri , Siw Bodil Fredriksen , Arild Follestad , Karl Isak Skau
- 申请人地址： AT Vienna
- 专利权人： Borealis AG
- 当前专利权人： Borealis AG
- 当前专利权人地址： AT Vienna
- 代理机构： Milbank, Tweed, Hadley & McCloy LLP
- 优先权： EP08020023 20081117
- 国际申请： PCT/EP2009/007444 WO 20091016
- 国际公布： WO2010/054732 WO 20100520
- 主分类号： C08L23/00
- IPC分类号： C08L23/00 ; C08F2/00 ; C08F4/00 ; C08F210/00 ; C08F110/02
摘要：
The present inventions relates to a process for producing polyethylene compositions comprising polymerizing polyethylene resins in a cascaded multi-stage reaction in which the reaction steps are performed in at least two slurry phase reactors (A) and (B) and at least one gas phase reactor (C) which are arranged in series in any order wherein in reactor (A) a low molecular weight ethylene homo- or copolymer fraction having a MFR2 of 100 to 2000 g/10 min, in reactor (B) a low molecular weight ethylene homo- or copolymer fraction having an MFR2 of 100 to 2000 g/10 min, and in reactor (C) a high molecular weight ethylene copolymer fraction are polymerized, and further comprising a compounding step after polymerization, wherein the final polyethylene composition has a MFR21 of 3 to 50 g/10 min, the melt flow rates being determined according to ISO 1133.