Salenol Catalyst Systems for Olefin Polymerization
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Solution Overview
Problem
There is a need for new and improved catalyst systems that can produce polyolefins with specific properties such as high melting point and molecular weight, increase conversion, and alter comonomer distribution without deteriorating polymer properties during olefin polymerization.
Innovation Solution
The development of catalyst compounds comprising Group 3, 4, 5, and 6 transition metals coordinated with a tetradentate salenol ligand system, which are used in olefin polymerization processes to produce polyolefins with enhanced properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional olefin polymerization catalysts are used, then polymer production is achieved, but the polymer properties such as melting point and molecular weight are limited
Solution Approach 1:
The patent applies parameter changes by systematically varying the ligand structure (different substituents R1-R10), metal center (Group 3-6 transition metals), and coordination geometry to optimize polymer melting point and molecular weight. The general formula I framework allows exploration of multiple parameter combinations to achieve desired polymer properties while maintaining catalyst functionality.
Solution Approach 2:
The catalyst system employs composite material principles by combining transition metal centers with organic salenol ligands featuring specific substituent patterns. This composite approach creates catalysts with tailored electronic and steric properties, enabling control over polymer microstructure and properties while maintaining catalyst stability and activity.
2Productivity
If conventional catalysts are used, then polymerization proceeds, but conversion and comonomer incorporation are insufficient
Solution Approach 1:
The patent applies local quality by introducing specific substituents at different positions (R1-R10) of the salenol ligand framework. These localized structural modifications create specific steric and electronic environments at the metal center, enabling selective comonomer incorporation and improved comonomer distribution while enhancing overall polymerization conversion.
Solution Approach 2:
The catalyst system employs dynamics by utilizing ligand design that allows flexible coordination geometries and dynamic substrate binding. The salenol ligand structure with variable substituents enables adaptive coordination environments that facilitate both high conversion and controlled comonomer incorporation through dynamic adjustment of the active site during polymerization.
3Manufacturing precision
If existing catalyst systems are used, then polymer production is achieved, but specific property requirements such as high molecular weight cannot be met
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing salenol ligands with predetermined substituent patterns before metal coordination. This preliminary ligand preparation allows optimization of steric and electronic properties independently, enabling control over polymer molecular weight while simplifying the overall catalyst manufacturing process through modular assembly.
Solution Approach 2:
The catalyst system employs segmentation by dividing the catalyst design into independent modular components: the salenol ligand framework, the metal center, and the substituents (R1-R10). This segmentation allows independent optimization of each component for desired molecular weight control, simplifying manufacturing by enabling separate synthesis and assembly of catalyst components.
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 catalyst systems effectively produce polyolefins with improved melting points, molecular weights, and comonomer distributions, enhancing the commercial usefulness of the polymers and meeting specific property requirements.
Implementation Method 1
a tetradentate salenol ligand system coordinated with the metal
Implementation Method 2
catalyst compounds and catalyst systems comprising such, methods of preparing such, uses thereof and products obtained thereby
Data Source
AI summary
Catalysts comprising salenol ligands are disclosed herein. Also, catalyst systems comprising the catalyst and an activator; methods to prepare the ligands, catalysts and catalyst systems; processes to polymerize olefins using the catalysts and/or catalyst systems; and the olefin polymers prepared according to the processes.