Bridged Phosphorous Ligand Catalyst for Polyolefin Elastomer Production
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current catalysts for polyolefin elastomer production struggle to achieve high molecular weight and low density while maintaining excellent polymerization performance, particularly at high temperatures and with large steric hindrance alpha-olefins like 1-hexene and 1-octene.
Innovation Solution
A novel transition metal compound and ligand compound are developed, represented by specific formulas, which are used to create a catalyst composition for polymerizing polyolefins, enabling the production of polyolefin elastomers with high molecular weight and low density through copolymerization of ethylene and alpha-olefins, even at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional metallocene catalysts are used, then polymerization can proceed, but activity is low and molecular weight is insufficient at high temperatures
Solution Approach 1:
The patent modifies the catalyst structure by changing the bridge type from silicon to phosphorous, ethylene, propylene, methylidene, or methylene, and adjusts ligand substituents to optimize catalyst performance at elevated temperatures, achieving high activity and molecular weight production
Solution Approach 2:
The invention creates composite catalyst systems combining transition metal compounds with specific ligand compounds featuring bridged structures, integrating multiple functional groups to achieve both high temperature stability and high polymerization activity
2Productivity
If commonly known metallocene catalysts are used, then polymerization occurs, but copolymerization degree of alpha-olefin with large steric hindrance is insufficient
Solution Approach 1:
The patent introduces specific ligand substituents at particular positions on the catalyst structure to create local electronic and steric environments that favor incorporation of alpha-olefins with large side chains, achieving high copolymerization degrees for 1-hexene, 1-octene, and other sterically hindered olefins
3Device complexity
If oxido ligand compounds are synthesized instead of amido ligand CGC, then new catalyst structure is created, but polymerization performance is inferior to CGC
Solution Approach 1:
The patent uses bridged ligand structures (phosphorous bridge, ethylene bridge, propylene bridge, methylidene bridge, methylene bridge) as intermediary components that mediate between the transition metal center and the monomer, providing a pathway that maintains high polymerization performance while enabling new catalyst structures and functionalities
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 composition demonstrates high activity in polymerization reactions, producing polyolefin elastomers with low density and high molecular weight, along with improved alpha-olefin selectivity and reduced melting index, enhancing the efficiency and properties of the polymerization process.
Implementation Method 1
a catalyst composition for polymerizing polyolefin, including the transition metal compound
Data Source
AI summary
The present invention provides a novel ligand compound, a transition metal compound and a catalyst composition including the same.