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    • 61. 发明授权
    • Multistage process for the polymerization of ethylene
    • 乙烯聚合的多阶段方法
    • US08557931B2
    • 2013-10-15
    • US13201202
    • 2010-02-15
    • Diego BritaGianni Collina
    • Diego BritaGianni Collina
    • C08F2/00C08F4/00C08F210/00C08F110/02
    • C08F210/16C08F4/6543C08F2/001C08F2/38C08F2/14C08F210/08C08F2500/12C08F2500/17C08F2500/24C08F210/14
    • The present invention relates to a slurry process for preparing an ethylene polymer having a melt flow ratio F/P, according to ASTM 1238, of higher than 25, carried out in two or more stages of polymerization at temperatures in the range from 60 to 120° C., in which at least two of the said two or more polymerization stages are carried out under different concentration of a molecular weight regulator, said process being carried out in the presence of a catalyst system comprising the product obtained by contacting (A) a solid catalyst component comprising Ti, Mg, halogen, and having a porosity (PF), measured by the mercury method and due to pores with radius equal to, or lower than, 1 μm of at least 0.3 cm3/g and a surface area determined by BET method, of lower than 100 m2/g, and (B) of an organoaluminum compound.
    • 本发明涉及一种用于制备乙烯聚合物的浆料方法,所述乙烯聚合物的熔体流动比F / P(根据ASTM 1238)高于25,在60至120℃的温度范围内进行两个或多个聚合阶段 其中所述两个或更多个聚合阶段中的至少两个在不同浓度的分子量调节剂下进行,所述方法在催化剂体系存在下进行,所述催化剂体系包含通过使(A) 包含Ti,Mg,卤素的固体催化剂组分,并且具有通过汞法测量的孔隙率(PF),并且由于具有至少0.3cm 3 / g的半径等于或小于1μm的孔和表面积 通过BET法测定,低于100m 2 / g,和(B)有机铝化合物。