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    • 16. 发明授权
    • Process for the preparation of polyethylene or polypropylene
    • 制备聚乙烯或聚丙烯的方法
    • US06177527B1
    • 2001-01-23
    • US09149579
    • 1998-09-08
    • Purna Chand SishtaXinmin YangFrederick John Karol
    • Purna Chand SishtaXinmin YangFrederick John Karol
    • C08F452
    • C08F10/00C08F4/65908C08F4/65912C08F110/02C08F110/06C08F4/65927C08F2500/03C08F2500/15
    • A process for the preparation of (i) polyethylene or (ii) polypropylene, which is essentially isotactic or a mixture of atactic and isotactic polypropylenes comprising contacting ethylene or propylene per se, or in admixture with one or more alpha-olefins, under polymerization conditions, with a catalyst system comprising: (a) a precatalyst comprising a mixture of racemic and meso stereoisomers of a metallocene catalyst containing two cycloalkadienyl ligands joined by a bridging linkage, said ligands complexed to a metal atom; and (b) (1) to obtain polyethylene catalyzed by the rac epimer only, a cocatalyst selected from the group consisting of tris(perfluorophenyl)borane and isobutyl alumoxane;  (2) to obtain polyethylene catalyzed by both the rac and the meso epimers, a cocatalyst selected from the group consisting of dimethylanilinium tetrakis(perfluorophenyl)borate and triphenylmethyl tetrakis(perfluorophenyl)borate;  (3) to obtain polypropylene, which is essentially isotactic, a cocatalyst selected from the group consisting of tris(perfluorophenyl)borane and isobutyl alumoxane;  (4) to obtain polypropylene, which is a mixture of atactic and isotactic polypropylenes in a weight ratio of atactic to isotactic polypropylenes of about 0.01:1 to about 1:1, a cocatalyst selected from the group consisting of dimethylanilinium tetrakis(perfluorophenyl)borate and triphenylmethyl tetrakis(perfluorophenyl)borate.
    • 一种制备(i)聚乙烯或(ii)聚丙烯的方法,其基本上是全同立构的,或无规立构和全同立构聚丙烯的混合物,包括在聚合条件下使乙烯或丙烯本身接触或与一种或多种α-烯烃混合 催化剂体系包括:(a)预催化剂,其包含茂金属催化剂的外消旋和内立体异构体的混合物,所述茂金属催化剂含有通过桥连键连接的两个环二烯基配体,所述配体与金属原子络合; 和(b)(1)获得由外消旋差向异构体催化的聚乙烯,选自三(全氟苯基)硼烷和异丁基铝氧烷的助催化剂; (2)获得由外消旋和中等差向异构体催化的聚乙烯,选自四(全氟苯基)硼酸二甲基苯铵和四(全氟苯基)硼酸三苯基甲酯的助催化剂; (3)得到选自三(全氟苯基)硼烷和异丁基铝氧烷的助催化剂基本上是全同立构的聚丙烯; (4)得到无规立构聚丙烯与全同立构聚丙烯的重量比为约0.01:1至约1:1的无规立构聚丙烯的混合物的聚丙烯,选自四(全氟苯基)硼酸二甲基苯铵 和四(全氟苯基)硼酸三苯基甲酯。