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    • 3. 发明申请
    • Process for the production of polyethylene resin
    • 聚乙烯树脂生产工艺
    • US20090182100A1
    • 2009-07-16
    • US12008740
    • 2008-01-14
    • Gerhard K. GuentherSteven D. GrayTim J. Coffy
    • Gerhard K. GuentherSteven D. GrayTim J. Coffy
    • C08F2/01
    • C08F210/16C08F110/02C08F2/001C08F2/00C08F2500/02C08F210/14C08F2500/01
    • Process for the polymerization of ethylene to produce a polymer of enhanced long chain branching. Ethylene and hydrogen are introduced into a first reaction zone to produce an ethylene polymer having a first molecular weight distribution. The polymer from the first reaction zone is applied to a second reaction zone along with ethylene and a C3-C8 alpha-olefin monomer. The second reaction zone is operated to produce a copolymer having a second molecular weight distribution different from the first molecular weight distribution. A polymer fluff of bimodal molecular weight distribution is recovered from the second reaction zone and heated to melt the fluff and then extruded. Concomitantly with the heating and or extrusion, the polymer fluff is treated in order to enhance the long chain branching and reduce the melt index MI5 of the polymer product.
    • 乙烯聚合制备增强长链支化聚合物的方法。 将乙烯和氢气引入第一反应区以产生具有第一分子量分布的乙烯聚合物。 来自第一反应区的聚合物与乙烯和C 3 -C 8α-烯烃单体一起施加到第二反应区。 操作第二反应区以产生具有不同于第一分子量分布的第二分子量分布的共聚物。 从第二反应区回收双峰分子量分布的聚合物绒毛,并加热熔化绒毛然后挤出。 伴随着加热和/或挤出,处理聚合物绒毛以增强长链支化并降低聚合物产物的熔体指数MI5。