Amine Bridged Metallocene Catalyst for Copolymer Control
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Solution Overview
Problem
Current metallocene catalysts for producing ethylene-alpha olefin copolymers lack an amine bridged metallocene compound and an effective method for its production, limiting the control over molecular structure and copolymerization efficiency.
Innovation Solution
A method involving the reaction of cyclopentadienyl and fluorenyl groups with amine to crosslink and coordinate with a transition metal, producing an amine bridged metallocene catalyst for use in polymerizing ethylene and alpha olefin, thereby facilitating the production of ethylene-alpha olefin copolymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional metallocene catalysts are used for producing ethylene-alpha olefin copolymers, then the catalyst system is well-established and易于生产, but the control over molecular structure and copolymerization efficiency is limited
Solution Approach 1:
The catalyst is divided into distinct functional segments: the metallocene core provides the active site for polymerization, while the amine bridging ligand provides a separate functional domain for controlling monomer insertion and copolymerization. This segmentation allows independent optimization of each function, achieving better molecular structure control without overwhelming complexity.
Solution Approach 2:
The catalyst combines two different ligand types (metallocene and amine) into a single composite structure. The metallocene portion provides the polymerization activity while the amine bridge provides structural control and influences copolymerization efficiency, creating a catalyst with multiple functions integrated into one molecule.
2Productivity
If amine bridged metallocene catalyst is used, then reactivity and copolymerization efficiency are enhanced, but the catalyst preparation method is more complex
Solution Approach 1:
The amine bridging ligand is pre-synthesized and characterized before being introduced to the metallocene precursor. This preliminary preparation allows for optimization of the bridging structure independently, and the final catalyst formation becomes a simpler coordination step rather than requiring complex in-situ synthesis during polymerization.
3Manufacturing precision
If metallocene catalyst is used instead of Ziegler-Natta catalyst, then the molecular weight distribution is narrow and second monomer distribution is uniform, but the catalyst cost is higher
Solution Approach 1:
The amine bridging ligand introduces new chemical parameters (basicity, steric bulk, coordination strength) that can be tuned to optimize the catalyst's interaction with different monomers. By adjusting these parameters, the catalyst achieves superior control over second monomer distribution uniformity, justifying the higher cost through improved product quality and consistency.
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 amine bridged metallocene catalyst enables easy production of ethylene-alpha olefin copolymers with controlled molecular structure and uniform second monomer distribution, enhancing reactivity and copolymerization efficiency.
Implementation Method 1
reacting two substituted or unsubstituted cyclopentadienyl groups, one substituted or unsubstituted cyclopentadienyl group and one substituted or unsubstituted fluorenyl group, or two substituted or unsubstituted fluorenyml groups with amine to crosslink them with nitrogen, and reacting them with a transition metal to coordinate them
Implementation Method 2
polymerizing ethylene and alpha olefin in the presence of an olefin polymerization catalyst composition including a metallocene catalyst
Data Source
AI summary
The present invention relates to an amine bridged metallocene catalyst, a method for producing the same, and a method for producing an ethylene-alpha olefin copolymer, which comprises polymerizing ethylene and alpha olefin in the presence of an olefin polymerization catalyst composition including a metallocene catalyst. The amine bridged metallocene catalyst may be produced by reacting one or more of substituted or unsubstituted cyclopentadiene and substituted or unsubstituted fluorene with amine to bridge them with nitrogen, and reacting them with a transition metal to coordinate them.