Amidine Ligand Organometallic Catalyst for Olefin Polymerization
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Solution Overview
Problem
The existing processes for preparing polymers using olefin polymerization catalysts suffer from low catalyst activity and require the use of toxic starting materials, leading to high production costs and inefficient polymerization.
Innovation Solution
The use of an organometallic compound with a specific amidine-containing spectator ligand, which is covalently bonded to the metal via the imine nitrogen atom, enhances catalyst activity and allows for the production of high molecular weight polyolefins without the need for toxic intermediates, thereby reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional organometallic complex of group 4 metal is used as catalyst, then the polymerization process can proceed, but the catalyst activity is relatively low
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by introducing an amidine-containing spectator ligand with specific substituents (Sub1 comprising a group 14 atom and Sub2 comprising a heteroatom of group 15-16). This ligand modification alters the electronic and steric properties of the catalyst, thereby changing its activity parameters and resolving the low catalyst activity problem while maintaining process reliability
Solution Approach 2:
The patent creates a composite catalyst system by combining the organometallic compound with a specifically designed amidine ligand system. The ligand contains multiple functional components (imine nitrogen for bonding, heteroatom substituents for electronic modulation) that work together to enhance catalyst activity, transforming a simple complex into a sophisticated composite catalytic system
2Ease of manufacture
If conventional catalyst systems are used, then polymerization can occur, but toxic starting materials and intermediates are required leading to high production costs
Solution Approach 1:
The patent extracts and eliminates the toxic components from the polymerization process by designing a catalyst system that operates without toxic starting materials or intermediates. The amidine ligand system enables the reaction to proceed through benign pathways, removing harmful substances from the manufacturing process while maintaining cost-effectiveness
Solution Approach 2:
The patent converts the traditional approach that relies on toxic materials into a beneficial process by using the amidine ligand to create a non-toxic catalytic system. The specific ligand structure (with heteroatoms from group 15-16) enables the catalyst to function effectively without requiring harmful substances, thereby converting a harmful process into a safe one
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 new catalyst system achieves significantly higher activity and lower production costs, enabling the production of high molecular weight polyolefins, including ultrahigh molecular weight polyethylene, with improved efficiency and reduced environmental impact.
Implementation Method 1
a process for the preparation of a polymer comprising at least one aliphatic or aromatic hydrocarbyl C2-20 olefin in the presence of an ionic catalyst comprising an organometallic compound, an activator and optionally a scavenger
Data Source
AI summary
The invention relates to a process for the preparation of a polymer comprising at least one aliphatic or aromatic hydrocarbyl C2-20 olefin in the presence of an ionic catalyst, comprising an organometallic compound and an activator, and optionally a scavenger.