Bimetallic Biphenol Complexes for Olefin Polymerization Control
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Solution Overview
Problem
There is a need for novel metal compounds that exhibit high catalytic performance in olefin polymerization, particularly in terms of catalytic efficiency and comonomer incorporation ability.
Innovation Solution
The development of bisphenol metal complexes, represented by specific structural formulas, which are synthesized through a method involving the reaction of a bisphenol compound with a strong base to form a di-salt, followed by reaction with a metal complex, and can be used as a component of a catalyst system in olefin polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional single metal catalysts are used for olefin polymerization, then the catalytic system is simple, but the catalytic efficiency and comonomer incorporation ability are limited
Solution Approach 1:
The patent combines two metal centers (zirconium and titanium) into a single bimetallic catalyst complex, where Zr and Ti are coordinated to the same bisphenol ligand framework. This merging of multiple metal functions into one catalyst entity enables synergistic effects that improve both catalytic efficiency and comonomer incorporation ability compared to single metal catalysts
Solution Approach 2:
The catalyst employs a composite structure with a有机ligand framework (bisphenol derivative) combined with multiple metal centers (Zr and Ti). This composite material approach creates a heterogeneous catalyst system that leverages the complementary properties of different metals and organic ligands to achieve superior catalytic performance
2Quantity of substance
If double metal catalysts are used to improve comonomer incorporation, then the comonomer content increases, but the molecular weight distribution becomes broader
Solution Approach 1:
The bimetallic catalyst exhibits local quality differentiation where the Zr center and Ti center provide different catalytic functionalities within the same catalyst molecule. The Zr site may favor comonomer incorporation while the Ti site maintains chain growth control, creating localized functional zones that work synergistically to balance comonomer content and molecular weight distribution
3Productivity
If complex bimetallic catalysts are synthesized, then the catalytic performance improves, but the preparation process becomes more complex
Solution Approach 1:
The synthesis methodology employs preliminary action by first preparing the organic bisphenol ligand framework with predetermined coordination sites, then sequentially introducing metal centers. This stepwise preliminary preparation of the ligand structure simplifies the overall synthesis of the complex bimetallic catalyst compared to attempting to assemble multiple metals simultaneously
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The bisphenol metal complexes demonstrate high catalytic efficiency and comonomer incorporation ability, achieving significant polymerization activities and molecular weights, as well as controlled molecular weight distributions in olefin polymerization.
Implementation Method 1
reacting a bisphenol compound with a strong base to form a di-salt
Implementation Method 2
reacting the di-salt with a metal complex to obtain the bisphenol metal complex
Implementation Method 3
the bisphenol metal complexes demonstrate high catalytic efficiency and comonomer incorporation ability, achieving significant polymerization activities and molecular weights
Data Source
AI summary
Disclosed is a biphenol metal complex. The structure thereof is as represented by formula I, wherein R1 and R1′ are each independently selected from hydrogen and a substituted or unsubstituted C1-C20 hydrocarbyl; R3-R7, R3′-R7′ are each independently selected from hydrogen and a substituted or unsubstituted C1-C20 hydrocarbyl, any two adjacent groups of R3-R7 are optionally linked to form a ring, and any two adjacent groups of R3′-R7′ are also optionally linked to form a ring; M and M′ are each independently selected from the Group 4 metals; each X is independently selected from the group consisting of a hydrocarbyl having 1 to 20 carbon atoms, hydride, amido, alkoxide, alkyl sulfide, alkyl phosphide, halide, diene, amine, phosphine, ether, and combinations thereof; m and n are independently an integer of from 1 to 4; and L is a divalent linking group.