Development of Group IV Molecular Catalysts for High Temperature Ethylene-伪-Olefin Copolymerization Reactions

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• 作者：Jerzy Klosin ; Philip P. Fontaine ; Ruth Figueroa
• 刊名：Accounts of Chemical Research
• 出版年：2015
• 出版时间：July 21, 2015
• 年：2015
• 卷：48
• 期：7
• 页码：2004-2016
• 全文大小：768K
• ISSN：1520-4898

文摘

This Account describes our research related to the development of molecular catalysts for solution phase olefin polymerization. Specifically, a series of constrained geometry and nonmetallocene (imino-amido-type) complexes were developed for high temperature olefin polymerization reactions. We have discovered many highly active catalysts that are capable of operating at temperatures above 120 掳C and producing copolymers with a useful range of molecular weights (from medium to ultrahigh depending on precatalyst identity and polymerization conditions) and 伪-olefin incorporation capability. Constrained geometry catalysts (CGCs) exhibit very high activities and are capable of producing a variety of copolymers including ethylene-propylene and ethylene-1-octene copolymers at high reactor temperatures. Importantly, CGCs have much higher reactivity toward 伪-olefins than classical Ziegler鈥揘atta catalysts, thus allowing for the production of copolymers with any desired level of comonomer. In search of catalysts with improved performance, we discovered 3-amino-substituted indenyl-based CGCs that exhibit the highest activity and produce copolymers with the highest molecular weight within this family of catalysts. Phenanthrenyl-based CGCs were found to be outstanding catalysts for the effective production of high styrene content ethylene-styrene copolymers under industrially relevant conditions.