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1. 发明公开

EP2746299A1 Multistage process for the polymerization of ethylene 审中-公开
标题翻译： Mehrstufiges Verfahren zur Polymerisierung von Ethylen
公开(公告)号：EP2746299A1
公开(公告)日：2014-06-25
申请号：EP12198087.4
申请日：2012-12-19
申请人： Basell Poliolefine Italia S.r.l.
发明人： Maus, Andreas , Meier, Gerhardus , Collina, Gianni , Brita, Diego
IPC分类号： C08F10/02 , C08F2/00 , C08F2/14
CPC分类号： C08F110/02 , C08F2/14 , C08F10/02 , C08F2/001 , C08F2500/07 , C08F2500/12 , C08F2500/14
摘要： The present invention relates to a slurry process for preparing an ethylene polymer having a melt flow ratio F/P, which is the ratio among the melt index value measured according to ASTM 1238 condition "F" and the melt index value measured according to ASTM 1238 condition "P" of equal to or lower than 27, 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 amounts of molecular weight regulator, said process being carried out in the presence of (A) a solid catalyst component comprising Ti, Mg, halogen, having a porosity (P F ), measured by the mercury method and due to pores with radius equal to, or lower than, 1µm, of at least 0.3 cm 3 /g and a surface area determined by BET method, of lower than 100 m 2 /g, and being further characterized by the fact that more than 50% of the titanium atoms are in a valence state lower than 4 and (B) of an organoaluminum compound.
摘要翻译：本发明涉及一种用于制备熔体流动比F / P的乙烯聚合物的浆料方法，其是根据ASTM 1238条件“F”测量的熔体指数值与根据ASTM 1238测量的熔体指数值之间的比率条件“P”等于或低于27，在60至120℃的温度下在两个或更多个聚合阶段进行，其中至少两个所述两个或更多个聚合阶段在不同量的分子量调节剂，所述方法在（A）包含Ti，Mg，卤素的固体催化剂组分的存在下进行，所述固体催化剂组分具有通过汞法测量的孔隙率（PF），并且由于半径等于，或低于1μm，至少0.3cm 3 / g，BET法测定的表面积低于100m 2 / g，进一步的特征在于，超过50％的钛原子为在低于4和（B）a的价态下有机铝化合物。

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