利索-全球专利检索

  1. 登录
  2. 注册
发明公开
CN108383935A 通过供给用选择的液体试剂饱和的负载催化剂得到的提高的聚合物熔体流动比率 审中-实审

通过供给用选择的液体试剂饱和的负载催化剂得到的提高的聚合物熔体流动比率
摘要：
本发明公开了一种生产乙烯-α-烯烃共聚物的方法。所述方法可包括将催化剂体系供应给气相聚合反应器，所述催化剂体系包括负载的茂金属，例如二茂铪，其具有用选择的液体试剂饱和的孔。然后可以将乙烯和α-烯烃在气相聚合反应器中与负载的茂金属接触以生产乙烯-α-烯烃共聚物。所述共聚物可具有小于0.93g/cm3的密度，小于2dg/min的熔融指数(I2)，和至少28的熔体流动比率(I21/I2)。为了有利地导致对催化剂性能和/或聚合物性能的期望的影响，可选择液体试剂以便当催化剂首次引入反应器中时，在初始加热阶段期间有利地操控催化剂温度曲线和/或催化剂-单体的相互作用。
摘要（英）：

A process for the production of ethylene alpha-olefin copolymers is disclosed. The process may include feeding a catalyst system comprising a supported metallocene, such as a hafnocene, having pores saturated with a selected liquid agent, to a gas phase polymerization reactor. Ethylene and an alpha-olefin may then be contacted with the supported metallocene in the gas phase polymerization reactor to produce an ethylene alpha-olefin copolymer. The copolymer may have a density of less than 0.93 g/cm3, a melt index (I2) of less than 2 dg/min, and a melt flow ratio (I21/I2) of at least 28. To advantageously result in desired effects on catalyst properties and/or polymer properties, the liquid agent may be selected to advantageously manipulate catalyst temperature profiles and/or catalyst-monomer interaction during an initial heating period when the catalyst is first introduced to the reactor.

0/0