Bis-phosphaguanidine Ligands for Olefin Polymerization
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Solution Overview
Problem
There is a need for improved olefin polymerization catalysts to meet the industrial demand for olefin-based polymers, as existing catalyst systems do not fully satisfy the requirements for producing polymers with desired physical properties.
Innovation Solution
The development of bis- and polyphosphaguanidine compounds and their metal-ligand complexes, which serve as procatalysts in olefin polymerization, offering alternative synthetic schemes by incorporating specific ligand frameworks and transition metals like titanium, zirconium, or hafnium to enhance polymerization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing catalyst systems are used for olefin polymerization, then the polymerization process can be carried out, but the desired physical properties of the polymers cannot be achieved
Solution Approach 1:
The patent modifies the chemical structure of the ligand framework by incorporating phosphaguanidine moieties with specific R groups (R1-R9) that can be varied to optimize catalyst performance. This structural parameter change enables precise control over polymer physical properties while maintaining reliable catalytic activity.
Solution Approach 2:
The invention creates composite catalyst systems by combining phosphaguanidine ligands with Group IV metal centers (Ti, Zr, Hf). This composite approach integrates the electronic properties of the phosphaguanidine framework with the catalytic activity of the metal, achieving both desired polymer properties and reliable catalysis.
2Manufacturing precision
If new procatalysts with phosphaguanidine ligands are developed, then polymer properties are improved, but the device complexity increases
Solution Approach 1:
The phosphaguanidine ligand framework is segmented into distinct functional regions: the P=N-C-N core structure and the peripheral R groups (R1-R9). This segmentation allows independent optimization of each region - the core provides catalytic functionality while the R groups tune polymer properties, simplifying the design process despite the overall molecular complexity.
3Manufacturing precision
If new procatalysts with phosphaguanidine ligands are developed, then polymer properties are improved, but the ease of manufacture decreases
Solution Approach 1:
The phosphaguanidine ligand framework is pre-synthesized with the desired R group substitutions before metal coordination. This preliminary action allows optimization of the ligand structure independently, simplifying the subsequent catalyst preparation and enabling precise control over polymer polydispersity without complicating the overall manufacturing process.
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
These procatalysts facilitate the production of high molecular weight polyolefins with narrow polydispersity and low octene incorporation, addressing the limitations of existing catalyst systems by improving polymer properties and process efficiency.
Implementation Method 1
phosphaguanidine metal-ligand complexes or procatalysts
Implementation Method 2
procatalysts in polyolefin polymerization
Data Source
AI summary
Embodiments are directed to bis- and poly-phosphaguanidine compounds, and the metal-ligand complexes formed therefrom, wherein the metal complexes can be used as procatalysts in polyolefin polymerization. Formulas (I) (II) and (III).