Metallocene compound, catalyst composition, olefin polymerization method, and ethylene-cycloolefin copolymer and preparation method therefor
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Solution Overview
Problem
Existing metallocene catalysts have insufficiencies in catalyst activity, copolymerization performance, and polymer molecular weight, limiting their operational efficiency and economic viability.
Innovation Solution
A novel metallocene compound with a specific structure, combined with a cocatalyst component, is used in olefin polymerization methods to enhance catalytic activity, copolymerization performance, and molecular weight, allowing for the synthesis of ethylene-cycloolefin copolymers with improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing metallocene catalysts are used, then olefin polymerization can be performed, but the catalyst activity is insufficient
Solution Approach 1:
The patent modifies the metallocene catalyst structure by changing the ligand parameters - specifically using a cyclopentadienyl ligand with a bridging group containing heteroatoms (O, N, or S) at specific positions. This parameter change in the catalyst structure leads to improved catalyst activity while maintaining stable performance, resolving the contradiction between productivity and reliability.
2Adaptability or versatility
If existing metallocene catalysts are used, then polymerization can proceed, but the copolymerization performance is poor
Solution Approach 1:
The patent creates a composite catalyst structure by combining a metallocene core with a specific ligand system featuring a cyclopentadienyl group attached to a bridging structure containing heteroatoms. This composite structure enhances copolymerization performance by providing both the necessary catalytic activity and the structural features needed for effective comonomer incorporation, while the systematic design keeps the overall structure manageable.
3Weight of moving object
If existing metallocene catalysts are used, then polymer production is possible, but the polymer molecular weight is low
Solution Approach 1:
The patent introduces a bridging group with heteroatoms at specific positions in the ligand structure, creating local regions of enhanced electron density and steric control. This local quality enhancement in the catalyst structure promotes higher molecular weight polymer formation by controlling the polymerization kinetics, while the overall catalyst design maintains good production efficiency.
4Productivity
If metallocene catalyst structure is modified to improve performance, then catalytic activity and copolymerization performance improve, but synthesis cost increases
Solution Approach 1:
The patent segments the ligand structure into distinct functional components: a cyclopentadienyl group, a bridging structure, and heteroatom-containing substituents. This segmentation allows for modular synthesis where each component can be prepared separately and then assembled, reducing overall synthesis cost while maintaining the improved catalytic activity and performance characteristics.
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 and catalyst composition achieve high catalytic activity, good copolymerization performance, and high molecular weight polymers, facilitating new applications in various fields with a cost-effective synthesis process.
Implementation Method 1
The metallocene compound for olefin polymerization has been a research hotspot in organometallic chemistry, catalytic chemistry, polymer chemistry and materials science in recent decades
Data Source
AI summary
A metallocene compound, a catalyst composition using the metallocene compound, an olefin polymerization method using the catalyst composition, and an ethylene-cycloolefin copolymer and a preparation method therefor. The metallocene compound has a structure as represented by formula (1), in which formula M is a tetravalent transition metal atom; X1 and X2 are each independently a halogen atom, an alkyl having 1 to 10 carbon atoms, an aryl having 6 to 12 carbon atoms or an N,N-dialkyl amino having 2 to 8 carbon atoms. The catalyst composition has the advantages of high catalytic activity, good copolymerization performance and a high molecular weight of an obtained polymer.