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    • 56. 发明申请
    • Bimetallic Catalyst, Method of Polymerization and Bimodal Polyolefins Therefrom
    • 双金属催化剂,聚合方法和双峰聚烯烃
    • US20120271015A1
    • 2012-10-25
    • US13495744
    • 2012-06-13
    • Sun-Chueh KaoMichael D. Awe
    • Sun-Chueh KaoMichael D. Awe
    • C08F4/76C08F210/02
    • C08F10/00C08F4/65908C08F4/65916C08F4/65925C08F110/02C08F4/65904C08F4/6555C08F2500/05C08F2500/07
    • Bimetallic catalysts, methods of producing bimetallic catalysts comprising a modified Ziegler-Natta catalyst and a metallocene, and methods of olefin polymerization using such catalysts are provided. The method of producing the bimetallic catalyst may include combining (a) a Ziegler-Natta catalyst comprising a Group 4, 5 or 6 metal halide and/or oxide, optionally including a magnesium compound, with (b) a modifier compound (“modifier”), wherein the modifier compound is a Group 13 alkyl compound, to form a modified Ziegler-Natta catalyst. The modified Ziegler-Natta catalyst is preferably non-activated, that is, it is unreactive towards olefin polymerization alone. The molar ratio of the Group 13 metal (of the modifier) to the Group 4, 5 or 6 metal halide and/or oxide may be less than 10:1. The bimetallic catalysts are useful in producing bimodal polymers, particularly bimodal polyethylene, having a Polydispersity (Mw/Mn) of from 12 to 50, which may be used in pipes and films.
    • 提供双金属催化剂,制备包含改性齐格勒 - 纳塔催化剂和茂金属的双金属催化剂的方法,以及使用这种催化剂的烯烃聚合方法。 制备双金属催化剂的方法可以包括将(a)包含任选包含镁化合物的第4,5或6族金属卤化物和/或氧化物的齐格勒 - 纳塔催化剂与(b)改性剂化合物(改性剂)组合, 其中所述改性剂化合物是13族烷基化合物,以形成改性的齐格勒 - 纳塔催化剂。 改性的齐格勒 - 纳塔催化剂优选是非活化的,即单独对烯烃聚合是不反应的。 第13族金属(改性剂)与第4,5或6族金属卤化物和/或氧化物的摩尔比可以小于10:1。 双金属催化剂可用于生产双峰聚合物,特别是双峰聚乙烯,其具有12至50的多分散性(Mw / Mn),其可用于管道和膜中。