Metallocene Catalyst for High Hydrogen Reactivity Olefin Polymerization
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Solution Overview
Problem
There is a need for new polymerization processes that exhibit high reactivity towards hydrogen and the capacity to produce higher molecular weight olefin-based polymers under optimum polymerization conditions, which are not adequately met by existing methods.
Innovation Solution
A process involving the polymerization of olefins in the presence of a catalyst system comprising a metal-ligand complex of specific Formula (I), which includes a metal-ligand complex with titanium, zirconium, or hafnium, along with a cocatalyst, to produce olefin-based polymers with desired properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional catalyst systems are used for olefin polymerization, then the polymerization process is well-established and easy to operate, but the reactivity toward hydrogen is insufficient and molecular weight is limited
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by using a metallocene procatalyst with specific ligand structures (Formula I) combined with cocatalysts and activators. This parameter change in catalyst composition enables higher hydrogen reactivity and molecular weight capacity while maintaining polymerization stability
Solution Approach 2:
The patent creates a composite catalyst system comprising multiple components: metallocene procatalyst, cocatalyst, and activator. This composite structure synergistically improves both hydrogen reactivity and molecular weight capacity while maintaining process reliability
2Ease of operation
If existing polymerization processes are used, then the process conditions are well-defined and easy to control, but the capacity to produce higher molecular weight polymers is insufficient
Solution Approach 1:
The patent modifies the catalyst system parameters (using metallocene with specific ligands and activators) to enable production of higher molecular weight polymers while maintaining controllable polymerization conditions through optimized catalyst composition
3Device complexity
If traditional catalyst systems are employed, then the process is simple and cost-effective, but the reactivity toward hydrogen is not high enough
Solution Approach 1:
The patent develops a composite catalyst system with metallocene procatalyst, cocatalyst, and activator that achieves high hydrogen reactivity. While the system is more complex than traditional catalysts, the complexity is justified by the significant improvement in hydrogen reactivity and polymer molecular weight
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
This process enables the production of olefin-based polymers with enhanced properties, such as zero shear viscosity and melt index, suitable for various applications, by optimizing polymerization conditions and reactivity.
Implementation Method 1
polymerizing at least one olefin in the presence of at least one catalyst system comprising the reaction product of: at least one cocatalyst; and a procatalyst comprising a metal-ligand complex of Formula (I)
Data Source
AI summary
The invention provides a process to form an olefin-based polymer, said process comprising polymerizing at least one olefin in the presence of at least one catalyst system comprising the reaction product of the following:A) at least one cocatalyst; andB) a procatalyst comprising a metal-ligand complex of Formula (I), as described herein: