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    • 96. 发明授权
    • Process for preparing an in situ polyethylene blend
    • 制备原位聚乙烯共混物的方法
    • US5589539A
    • 1996-12-31
    • US343849
    • 1994-11-23
    • Burkhard E. WagnerArakalgud V. Ramamurthy
    • Burkhard E. WagnerArakalgud V. Ramamurthy
    • C08F2/00C08F2/34C08F4/60C08F4/658C08F10/00C08F10/02C08F210/16C08L23/04C08L23/08C08L23/16C08F297/08
    • C08F210/16C08L23/04C08L2205/02C08L23/0815C08L2308/00
    • A process for the production of an in situ particulate polyethylene blend comprising contacting a magnesium/titanium based catalyst system including a particulate precursor with one or more alpha-olefins in each of two or more reactors connected in series, in the gas phase, under polymerization conditions, with the provisos that:(a) the particulate precursor has a particle size distribution span of no greater than about 1.5 as introduced into the first reactor in the series;(b) ethylene is introduced into each reactor;(c) optionally, an alpha-olefin having at least 3 carbon atoms is introduced into at least one reactor;(d) the mixture of ethylene polymer matrix and active catalyst formed in the first reactor in the series is transferred to the subsequent reactors in the series; and(e) the polymerization conditions in each reactor are such that a high molecular weight polymer is formed in at least one reactor and a low molecular weight polymer is formed in at least one other reactor wherein the ratio of molecular weights of the high molecular weight polymer to low molecular weight polymer in the final product is at least about 8:1.
    • 一种生产原位颗粒聚乙烯混合物的方法,其包括在聚合过程中使包含颗粒前体的镁/钛基催化剂体系与在气相中串联连接的两个或更多个反应器的每一个中的一个或多个α-烯烃 条件,条件是:(a)颗粒前体的粒度分布跨度不大于约1.5,引入到该系列的第一反应器中; (b)将乙烯引入每个反应器中; (c)任选地,将具有至少3个碳原子的α-烯烃引入至少一个反应器中; (d)将串联的第一反应器中形成的乙烯聚合物基质和活性催化剂的混合物转移到该系列的后续反应器中; 和(e)每个反应器中的聚合条件使得在至少一个反应器中形成高分子量聚合物,并且在至少一个其他反应器中形成低分子量聚合物,其中高分子量的分子量 聚合物与最终产物中的低分子量聚合物的摩尔比为至少约8:1。