Post Metallocene Catalyst Ligand Design for Olefin Polymerization
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Solution Overview
Problem
Conventional metallocene catalysts face limitations in high-temperature olefin polymerization and copolymerization of sterically hindered monomers, such as 1-octene, with suboptimal molecular weight and distribution, necessitating the development of next-generation post metallocene catalysts with enhanced activity and control.
Innovation Solution
A novel post metallocene catalyst system utilizing a hydroquinoline-based ligand with an aldehyde-substituted phenyl ring, forming a multi-chelate compound with a Group IV metal, which is combined with specific cocatalysts to create a highly active catalyst composition for olefin polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional metallocene catalysts are used for high-temperature olefin polymerization, then polymerization can proceed, but the catalyst shows limited activity and produces suboptimal molecular weight and distribution
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by introducing a post-metallocene catalyst structure with specific ligands (hydroquinoline-based with aldehyde-substituted phenyl rings) and metal centers (Group IV metals like Ti, Zr, Hf). This structural parameter change enables the catalyst to achieve both high activity and improved molecular weight control at elevated temperatures, resolving the contradiction between productivity and manufacturing precision.
Solution Approach 2:
The patent creates a composite catalyst system combining Group IV metal compounds with specifically designed organic ligands featuring hydroquinoline and phenyl aldehyde moieties. This composite structure synergistically enhances both catalytic activity and molecular weight distribution control, allowing simultaneous improvement of productivity and manufacturing precision that conventional metallocene catalysts cannot achieve.
2Adaptability or versatility
If conventional metallocene catalysts are used for copolymerization of sterically hindered monomers, then polymerization occurs, but the degree of copolymerization is insufficient
Solution Approach 1:
The patent modifies the catalyst's steric and electronic parameters through the post-metallocene ligand structure, creating a more flexible coordination environment that accommodates sterically hindered monomers like 1-octene. This parameter change enables superior copolymerization capability and precise control over monomer incorporation, resolving the contradiction between adaptability and manufacturing precision.
Solution Approach 2:
The patent introduces local structural features in the ligand design, specifically the hydroquinoline core with aldehyde-substituted phenyl rings at particular positions, creating localized electronic and steric properties that enhance copolymerization capability while maintaining control over monomer incorporation, thus resolving the contradiction between versatility and precision.
3Productivity
If higher polymerization temperature is used to increase activity, then productivity improves, but molecular weight decreases
Solution Approach 1:
The patent changes the thermal and kinetic parameters of the catalyst system through the post-metallocene structure, which maintains active sites that are less sensitive to temperature-induced deactivation. This allows the catalyst to sustain high activity at elevated temperatures while preserving molecular weight, resolving the contradiction between productivity and quantity of substance.
Solution Approach 2:
The patent employs a catalyst structure with inherently stable metal-ligand bonds that resist thermal decomposition, creating a more durable catalytic species that maintains activity and molecular weight control at high temperatures, effectively decoupling the trade-off between temperature-driven productivity and molecular weight preservation.
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 novel catalyst composition achieves high activity and molecular weight in olefin polymerization, particularly for ethylene/1-octene copolymers, with broadened molecular weight distribution and improved processability, surpassing conventional metallocene catalysts in terms of activity and molecular weight control.
Implementation Method 1
a multi-chelate ligand compound for various post-metallocene catalyst derived therefrom
Implementation Method 2
metallic compound having a Group IV metal as a central metal prepared by using the aforementioned ligand
Implementation Method 3
a catalyst composition comprising the aforementioned metallic compound, a production method thereof, and a process for preparing olefin polymers by using the same
Data Source
AI summary
The present invention relates to a novel post metallocene-type ligand compound, to a metal compound containing the ligand compound, to a catalytic composition containing the metal compound, and to a method for preparing same, as well as to a method for preparing olefin polymers using the catalytic composition. The present invention provides a catalyst for preparing special polyolefin-based polymers having excellent activity.