Olefin Polymerization Catalyst Systems for Molecular Weight Control
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Solution Overview
Problem
Current olefin polymerization catalyst systems fail to efficiently produce high molecular weight polyolefins with narrow polydispersities and low octene concentrations, which are crucial for specific applications.
Innovation Solution
A metal-ligand complex catalyst system, specifically a procatalyst component with a Formula (I) structure, is used for olefin polymerization, comprising titanium, zirconium, or hafnium, with specific ligand configurations that facilitate the production of high molecular weight polyolefins with narrow polydispersities and low octene incorporation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional olefin polymerization catalyst systems are used, then polymerization can proceed, but the molecular weight and polydispersity of the resulting polyolefins cannot be effectively controlled
Solution Approach 1:
The patent employs precise modification of catalyst parameters including the metal center (titanium, zirconium, or hafnium), ligand types (amido, alkoxide, carboxylate), and their specific combinations to achieve controlled molecular weight and polydispersity. The general formula (I) with specific parameter ranges allows systematic optimization of polymer properties while maintaining reasonable structural complexity.
Solution Approach 2:
The catalyst system combines multiple components in a composite structure: a metal center coordinated with specific ligands (amido, alkoxide, carboxylate) in defined stoichiometric ratios. This composite approach enables simultaneous control over polymerization activity, molecular weight, and polydispersity by optimizing the interactions between different catalytic components.
2Reliability
If conventional catalyst systems are used, then polymerization can occur, but octene incorporation cannot be sufficiently reduced
Solution Approach 1:
The patent applies local quality by designing specific ligand environments around the metal center that create selective binding sites. The combination of amido, alkoxide, and carboxylate ligands in specific configurations creates localized electronic and steric properties that favor ethylene polymerization while discriminating against octene incorporation, achieving high selectivity without excessive overall system complexity.
3Ease of manufacture
If catalyst systems are simplified, then ease of manufacture improves, but the ability to produce high molecular weight polyolefins with narrow polydispersities deteriorates
Solution Approach 1:
The catalyst system is segmented into distinct functional components: the metal center (titanium, zirconium, or hafnium) and separately defined ligands (amido, alkoxide, carboxylate). This segmentation allows each component to be optimized and synthesized independently using well-established methods, then combined in controlled ratios to achieve the desired molecular weight and polydispersity control in the final polymer product.
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 catalyst system effectively produces polyolefins with improved molecular weight and polydispersity profiles, enabling the creation of materials with enhanced performance characteristics.
Implementation Method 1
A procatalyst component comprising a metal-ligand complex of Formula (I) where M is titanium, zirconium, or hafnium
Data Source
AI summary
An olefin polymerization catalyst system includes a procatalyst component chosen from metal-ligand complexes of Formula (I): In Formula (I), each X is independently a monodentate or polydentate ligand that is neutral, monoanionic, or dianionic; the metal-ligand complex of Formula (I) is overall neutral; each Y1-Y4 and Y7-Y10 independently is selected from C or N such that six membered diaza (N2) or triaza (N3) rings are formed; wherein each R1 and R10 independently are chosen from (C1-C40) hydrocarbyl, substituted (C1-C40) hydrocarbyl, (C1-C40) heterohydrocarbyl, and substituted (C1-C40) heterohydrocarbyl or is absent; each R2, R3, R4, R7, R8, and R9 is chosen from hydrogen; (C1-C40) hydrocarbyl; substituted (C1-C40) hydrocarbyl; (C1-C40) heterohydrocarbyl; substituted (C1-C40) heterohydrocarbyl; halogen, nitro (NO2) or is absent; each R5 and R6 independently is chosen from (C1-C40) hydrocarbyl, substituted (C1-C40) hydrocarbyl, (C1-C40) heterohydrocarbyl, and substituted (C1-C40) heterohydrocarbyl.