申请人:ExxonMobil Chemical Patents Inc.
公开号:US20200255555A1
公开(公告)日:2020-08-13
The present disclosure relates to Lewis base catalysts. Catalysts, catalyst systems, and processes of the present disclosure can provide high temperature ethylene polymerization, propylene polymerization, or copolymerization as the Lewis base catalysts can be stable at high polymerization temperatures and have good activity at the high polymerization temperatures. The stable catalysts with good activity can provide formation of polymers having high melting points, high isotacticity, and controllable molecular weights, and the ability to make an increased amount of polymer in a given reactor, as compared to conventional catalysts. Hence, the present disclosure demonstrates highly active catalysts capable of operating at high reactor temperatures while producing polymers with controlled molecular weights and or robust isotacticity.
本公开涉及路易斯碱催化剂。本公开的催化剂、催化剂体系和工艺可以提供高温乙烯聚合、丙烯聚合或共聚合,因为路易斯碱催化剂在高聚合温度下能够稳定,并且在高聚合温度下具有良好的活性。具有良好活性的稳定催化剂可以提供具有高熔点、高异构度和可控分子量的聚合物形成,并且相比传统催化剂,能够在给定反应器中生产更多量的聚合物。因此,本公开展示了能够在高反应器温度下运行的高活性催化剂,同时生产具有可控分子量和/或强偏晶性的聚合物。