Bridged diamidino group-IV metal catalyst and method for preparing same

A metal catalyst and a bridging technology, which are applied in the field of bridged bisamidine group IV metal catalysts and their preparation, can solve the problems of complex synthesis methods, harsh synthesis conditions, easy deactivation and the like, and achieve simple preparation methods and easy-to-obtain raw materials. , the effect of low price
CN101798360AInactive Publication Date: 2010-08-11SHANXI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANXI UNIV
Publication Date
2010-08-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a bridged diamidino group-IV metal catalyst, which relates to an olefin polymerization catalyst, in particular to a compound taking metals of a group IV as central atoms and a seven-element skeleton with an N-C-N-Si-N-C-N characteristic as a ligand. A method for preparing the bridged diamidino group-IV metal catalyst comprises the following steps: in the protection of nitrogen, taking bridging diamine as an initial raw material and converting the bridging diamine into a dilithium salt by utilizing butyl lithium; adding cyanophenyl into the dilithium salt to produce an addition reaction, forming a bridged diamidino ligand after migrating a silicon base twice, and performing a complex reaction on the polydentate ligand and group-IV metal chloride of the group IV to prepare bridged diamidino group-IV metal chloride; and reacting lithium methide with the bridged diamidino group-IV metal chloride to displace helium atoms to produce a methyl substitute. The synthesis method has the advantages of universal applicability, moderate reaction condition, simple and easily-obtained materials, low cost, simple steps and relatively higher productivity. The compound has good catalytic effect on the polyreaction of olefin.
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Description

technical field

[0001] The invention relates to a group IV transition metal catalyst for ethylene polymerization, in particular to a bridging bis-amidino group IV metal catalyst with an N-C-N-Si-N-C-N skeleton, a preparation method and application thereof. Background technique

[0002] At present, industrialized olefin polymerization catalysts include Ziegler-Natta catalysts, Phillips catalysts and metallocene catalysts, etc. These catalysts can control the catalytic activity and polymer properties by adjusting the structure of the ligand. Brintzinger reported that a class of bridged metallocene catalysts not only has high activity, but also can control the stereo configuration of polymers (H. Schnutenhaus, H.H. Brintzinger, Angew. Chem, Int. Ed., 1979, 18, 777.). However, they all have defects such as harsh synthesis conditions and low total catalyst yield. In addition, the storage conditions of the catalyst are also very harsh, easy to deactivate, and the synthesis method ...

Claims

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