Polymerization process
    4.
    发明授权
    Polymerization process 有权
    聚合过程

    公开(公告)号:US06921798B2

    公开(公告)日:2005-07-26

    申请号:US10456283

    申请日:2003-06-06

    摘要: Polymerization processes are disclosed for producing polyethylene having a target density and improved environmental stress resistance. Ethylene and optionally one or more α-olefin comonomers, supported chromium catalyst, and metal alkyl cocatalyst are contacted to produce polyethylene. The density of the polyethylene is determined, and the concentration of cocatalyst is adjusted in response to a deviation between the density of the polyethylene and the target density. The catalyst and cocatalyst can be fed separately into the reactor, or can be co-fed, eliminating the need to pre-contact the catalyst and cocatalyst prior to introducing them into the reactor.

    摘要翻译: 公开了用于生产具有目标密度和改善的耐环境应力的聚乙烯的聚合方法。 乙烯和任选的一种或多种α-烯烃共聚单体,负载的铬催化剂和金属烷基助催化剂接触以制备聚乙烯。 确定聚乙烯的密度,并且响应于聚乙烯的密度和目标密度之间的偏差来调节助催化剂的浓度。 催化剂和助催化剂可以单独进料到反应器中,或者可以共同进料,而不需要在将催化剂和助催化剂引入反应器之前预接触催化剂和助催化剂。