Bis-phenyl-phenoxy Polyolefin Catalysts with Alkoxy Ligands
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Solution Overview
Problem
Current olefin polymerization catalyst systems face challenges in achieving high molecular weights and narrow molecular weight distribution while requiring large amounts of solvents for solubilization, leading to inefficiencies and environmental concerns.
Innovation Solution
A metal-ligand complex with specific structural features, including titanium, zirconium, or hafnium as the metal and specific ligands, is developed to enhance solubility and catalytic efficiency, allowing for the production of polymers with improved properties using reduced solvent amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If molecular catalyst systems are used for olefin polymerization, then polymerization activity and molecular weight control are improved, but solubility in apolar solvents deteriorates requiring large amounts of solvent
Solution Approach 1:
The patent introduces alkyl groups at specific positions (R2, R3, R4) on the phenoxy ligand structure to locally modify the catalyst's solubility properties. This local structural modification enhances overall solubility in apolar solvents without compromising the catalytic active site's functionality, thereby reducing the amount of solvent required while maintaining high polymerization activity.
Solution Approach 2:
The patent modifies the chemical structure parameters of the catalyst by introducing specific alkyl substituents (methyl, ethyl, propyl, butyl groups) at defined positions on the ligand framework. These parameter changes in the molecular structure directly improve solubility characteristics, allowing the catalyst to function effectively in apolar solvents with reduced solvent-to-catalyst ratios.
2Quantity of substance
If conventional catalyst systems are used, then solubility is maintained, but molecular weight and molecular weight distribution control deteriorate
Solution Approach 1:
The patent creates a composite ligand structure combining phenoxy groups with alkyl-substituted aromatic rings. This composite molecular architecture integrates the solubility benefits of alkyl groups with the structural rigidity and electronic properties of aromatic systems, achieving both good solubility and precise molecular weight control through the synergistic effect of the composite structure.
3Productivity
If catalyst efficiency is increased for high molecular weight polymers, then polymerization activity improves, but solvent requirements increase
Solution Approach 1:
The patent segments the ligand structure into distinct functional regions: the phenoxy core providing catalytic activity and the alkyl-substituted aromatic groups providing solubility. This segmentation allows the catalyst to maintain high efficiency for producing high molecular weight polymers while the solubilizing groups reduce the energy-intensive solvent processing requirements through improved catalyst-solvent interactions.
Data Source
AI summary
Embodiments are directed to a catalyst system comprising metal ligand complexes and processes for polyolefin polymerization using the metal ligand complex having the following structure : where X is selected from the group consisting of -ORX or NRX 2.