Metallocene Catalyst for Low Molecular Weight Polyolefins
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Solution Overview
Problem
Current metallocene catalysts for olefin polymerization lack superior polymerization activity and copolymerization performance, especially when used in commercial applications, despite efforts to synthesize derivatives with nitrogen substituents and various bridges instead of silicon bridges.
Innovation Solution
A novel metallocene compound with a tetrahydroindene structure, represented by Formula 1, is developed, which is used in a catalyst composition alongside specific cocatalyst compounds to enhance polymerization activity, allowing for the production of olefin-based polymers with low molecular weight and wide molecular weight distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional metallocene catalysts are used for olefin polymerization, then basic polymerization function is achieved, but polymerization activity and copolymerization performance are insufficient
Solution Approach 1:
The patent applies local quality by introducing specific substituent groups (R1-R6) at particular positions on the cyclopentadienyl rings of the metallocene catalyst. These localized chemical modifications at specific sites create optimal electronic and steric environments for both high polymerization activity and superior copolymerization performance, resolving the contradiction between basic function and enhanced performance.
Solution Approach 2:
The patent creates a composite catalyst system by combining the metallocene compound with specific ligand structures containing nitrogen substituents and silicon bridges. This composite structure integrates multiple functional elements (metal center, cyclopentadienyl rings, bridging groups, and substituents) that work synergistically to achieve both high productivity and reliable copolymerization performance.
2Adaptability or versatility
If derivatives with nitrogen substituents and various bridges are synthesized instead of silicon bridges, then structural diversity is increased, but polymerization activity and copolymerization performance deteriorate
Solution Approach 1:
The patent applies parameter changes by systematically varying specific parameters (R1-R6 substituents, bridge types) while maintaining critical structural parameters (metallocene core, cyclopentadienyl framework). This selective parameter optimization achieves structural diversity necessary for adaptability while preserving the polymerization activity and copolymerization performance required for productivity.
3Ease of manufacture
If existing metallocene catalysts are applied to commercial plants, then industrial application is achieved, but superior polymerization activity and copolymerization performance are not obtained
Solution Approach 1:
The patent applies segmentation by dividing the catalyst design into modular components (metal center, ligand framework, bridging groups, and substituents) that can be independently optimized and then assembled. This modular approach enables systematic improvement of polymerization activity and copolymerization performance while maintaining industrial manufacturability through standardized synthesis procedures.
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 novel metallocene compound exhibits high catalytic activity, enabling the production of olefin-based polymers with low molecular weight and wide molecular weight distribution, particularly in polyolefin copolymers, surpassing the performance of existing catalysts.
Implementation Method 1
Metallocene catalysts for olefin polymerization have been developed over a long period of time. The novel metallocene compound exhibits high catalytic activity, enabling the production of olefin-based polymers
Data Source
AI summary
This invention relates to a novel metallocene compound, a catalyst composition including the same and a method of preparing olefin-based polymers using the same. The use of the novel metallocene compound as a catalyst for preparing olefin-based polymers enables synthesis of an olefin-based polymer having a low molcular weight and a wide molcular weight distribution.