Catalyst Composition for Polyolefin Copolymerization
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Solution Overview
Problem
Current catalysts for ethylene and alpha-olefin copolymerization, such as those derived from Constrained-Geometry Catalysts, fail to achieve improved polymerization performance and require complex synthesis methods, limiting their practical application in commercial settings.
Innovation Solution
A catalyst composition comprising a cis and trans isomer of a transition metal compound with a specific structure, supported on a phenylene bridge and cyclopentadienyl ligand, which forms a stable and rigid pentagonal structure, allowing for efficient copolymerization even at high temperatures and producing polyolefins with narrow molecular weight distribution and low density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional CGC derivatives with phosphorous, ethylene, propylene, or methylidene bridges are used, then polymerization activity is maintained, but copolymerization performance and activity improvement are not achieved
Solution Approach 1:
The patent changes the bridge structure parameter from conventional phosphorous, ethylene, propylene, or methylidene bridges to a specific indenyl ligand structure with a particular arrangement of substituents. This structural parameter change results in both improved polymerization activity and superior copolymerization performance, resolving the contradiction between maintaining activity and improving copolymerization capability.
2Manufacturing precision
If complex synthesis methods are used for CGC derivatives, then catalyst structure precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs a segmented synthesis approach where the indenyl ligand is first synthesized as a separate intermediate with specific substituents, then combined with the metal center in a final assembly step. This segmentation of the synthesis process into discrete, manageable stages achieves high structural precision while avoiding the complexity of single-step complex syntheses, making the method more suitable for practical application.
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 enables the production of polyolefins with high molecular weight, narrow molecular weight distribution, and excellent copolymerization properties, including low-density polyethylene, while simplifying the catalyst preparation process and enhancing polymerization performance.
Implementation Method 1
A catalyst composition comprising a cis isomer and a trans isomer of the following formula (I) is provided, wherein the catalyst composition enables the production of polyolefins with high molecular weight, narrow molecular weight distribution, and excellent copolymerization properties
Data Source
AI summary
The present specification relates to a catalytic composition and a method for preparing a polymer including the same.