利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

2398 条记录 (耗时 0.028 秒)

    CATALYST COMPOSITION FOR POLYMERIZING PROPYLENE AND METHOD FOR PRODUCING POLYPROPYLENE
    2.
    发明公开
    CATALYST COMPOSITION FOR POLYMERIZING PROPYLENE AND METHOD FOR PRODUCING POLYPROPYLENE 审中-公开

    公开(公告)号：EP4455169A1

    公开(公告)日：2024-10-30

    申请号：EP23193732.7

    申请日：2023-08-28

    申请人： Formosa Plastics Corporation

    发明人： Chang, Chao-Shun ,  Chen, Hsing-Chun ,  Hsieh, Kun-Pei ,  CHIU, Chun-Wei

    IPC分类号： C08F110/06 ,  C08F210/06

    摘要： The present disclosure relates to a catalyst composition for polymerizing propylene and a method for producing polypropylene. The catalyst composition for polymerizing the propylene includes a modifying agent. The modifying agent is an ester compound having hydrophilic groups and hydrophobic groups. In the method for producing the polypropylene, a reverse microcellular structure is formed by the modifying agent during a propylene polymerization, in which the hydrophilic groups are inside the reverse microcellular structure, and the hydrophobic groups are outside the reverse microcellular structure, such that polar substances in a raw material are retained inside the reverse microcellular structure. Thus, poisoning of the catalyst is reduced. Besides, the modifying agent can maintain a valence state of titanium in an active site of the catalyst at positive trivalent, such that the propylene polymerization between the titanium and the monomer is facilitated, thereby enhancing an activity of the catalyst.

    CATALYST TRANSITION PROCESS
    10.
    发明公开
    CATALYST TRANSITION PROCESS 审中-公开

    公开(公告)号：EP4389783A1

    公开(公告)日：2024-06-26

    申请号：EP22215204.3

    申请日：2022-12-20

    申请人： Borealis AG

    发明人： LESKINEN, Pauli ,  WANG, Jingbo ,  GAHLEITNER, Markus ,  BERNREITNER, Klaus

    IPC分类号： C08F110/06

    CPC分类号： C08F110/06 ,  C08F4/65912 ,  C08F4/65916 ,  C08F2410/0520130101

    摘要： A process for transitioning between two different catalysts during the production of polypropylene homo- or copolymers in a continuous multistage polymerisation reaction , the process comprising the steps of:
    a) polymerising propylene and optionally comonomers in a multi stage polymerisation reactor system comprising a prepolymerization reactor, a subsequent slurry reactor and thereafter a gas phase reactor in the presence of a first catalyst;
    b) discontinuing the feed of the first catalyst to the prepolymerization reactor;
    c) subsequently introducing, propylene, optionally comonomers, and a second catalyst into the prepolymerization reactor, and further introducing an aluminium alkyl into the polymerization reactor simultaneously with the introduction of the second catalyst;
    d) polymerising propylene and optionally comonomers in the multistage polymerisation reactor system in the presence of the second catalyst;

    wherein the first catalyst is a Ziegler-Natta catalyst and the second catalyst is a single site catalyst; and
    wherein the amount of aluminium alkyl fed in step c) is 0.5 to 10.0 g per ton of total propylene fed into the prepolymerisation reactor and the slurry reactor in steps c) and d).