发明授权
US4355144A Process for producing a propylene-ethylene copolymer having improved
stretchability
失效
制备具有改善的拉伸性的丙烯 - 乙烯共聚物的方法
- 专利标题: Process for producing a propylene-ethylene copolymer having improved stretchability
- 专利标题(中): 制备具有改善的拉伸性的丙烯 - 乙烯共聚物的方法
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申请号: US257431申请日: 1981-04-24
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公开(公告)号: US4355144A公开(公告)日: 1982-10-19
- 发明人: Akinobu Shiga , Kiyoshi Matsuyama , Masahiro Kakugo , Yukio Naito , Seiichiro Ima , Katsuyoshi Yamashita
- 申请人: Akinobu Shiga , Kiyoshi Matsuyama , Masahiro Kakugo , Yukio Naito , Seiichiro Ima , Katsuyoshi Yamashita
- 申请人地址: JPX Osaka
- 专利权人: Sumitomo Chemical Company Limited
- 当前专利权人: Sumitomo Chemical Company Limited
- 当前专利权人地址: JPX Osaka
- 优先权: JPX54-108341 19790824
- 主分类号: C08F4/00
- IPC分类号: C08F4/00 ; C08F2/00 ; C08F4/60 ; C08F4/64 ; C08F10/00 ; C08F10/06 ; C08F210/00 ; C08F210/06 ; C08F210/16
摘要:
In a process for producing polypropylene comprising polymerizing propylene in the presence of hydrogen and a catalyst system comprising (A) titanium trichloride obtained by reducing titanium tetrachloride with an organoaluminum compound and reacting the reduced solid with an ether represented by the formula:R.sup.1 -O-R.sup.2wherein R.sup.1 and R.sup.2 are defined hereinbefore, and a halogen compound selected from the group consisting of (i) halogen or interhalogen compounds of the formula, X.sup.1 X.sup.2.sub.a (wherein X.sup.1, X.sup.2 and a are defined hereinbefore), (ii) titanium halides, and (iii) organic halogen compounds, simultaneously or successively and (B) an organoaluminum compound, the improvement which comprises supplying ethylene together with propylene to the polymerization system such that the ethylene concentration in the vapor phase of the system based on the total amount of propylene, ethylene and hydrogen in the vapor phase of the system is 0.15 to 1.5 mol % to obtain a propylene-ethylene copolymer having an ethylene content of from 0.1 to 1.0 wt % is disclosed. The propylene-ethylene copolymer is improved in stretchability.
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