Metallocene Catalyst Composition for High-Molecular-Weight COC
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Solution Overview
Problem
Existing metallocene catalysts have insufficient catalytic activity, copolymerization performance, and polymer molecular weight, limiting the production efficiency and cost-effectiveness of cyclic olefin copolymers with desirable properties.
Innovation Solution
A novel metallocene compound and catalyst composition, comprising a metallocene compound with specific transition metal and ligand configurations, combined with alkyl aluminoxane or a combination of organoboron and organoaluminum compounds, are used to enhance catalytic activity and copolymerization performance, resulting in high molecular weight ethylene-cyclic olefin copolymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing metallocene catalysts are used, then copolymerization can be performed, but catalytic activity is insufficient
Solution Approach 1:
The patent modifies specific positions on the metallocene ligand structure (introducing aromatic substituents at defined locations) to locally enhance electronic properties and steric environment around the active metal center, thereby improving both catalytic activity and copolymerization performance simultaneously
Solution Approach 2:
The patent combines metallocene compounds with specific cocatalysts (alkylaluminoxanes or organoboron/organometallic combinations) to create a composite catalytic system where each component contributes specific functions, achieving synergistic enhancement of catalytic activity and polymerization performance
2Quantity of substance
If existing metallocene catalysts are used, then polymerization can proceed, but polymer molecular weight is insufficient
Solution Approach 1:
The patent systematically varies key parameters including metal center identity (Ti, Zr, Hf), ligand substitution patterns, and cocatalyst selection to optimize the balance between polymer molecular weight and production efficiency, achieving both high molecular weight and high productivity in the same catalytic system
3Ease of manufacture
If production cost is reduced, then commercial viability improves, but catalytic performance may be compromised
Solution Approach 1:
The patent employs relatively simple and inexpensive metallocene ligand structures with common aromatic substituents that can be synthesized through straightforward routes, combined with cost-effective cocatalysts, achieving high catalytic activity at lower production cost compared to more complex catalyst systems
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 catalyst system achieves high catalytic activity, good copolymerization performance, and high molecular weight of the obtained ethylene-cyclic olefin copolymers, potentially reducing production costs and expanding their commercial applications.
Implementation Method 1
Metallocene compounds used in olefin polymerization have been a research hotspot... This type of catalyst can catalyze the formation of many new copolymers
Data Source
AI summary
The present invention relates to the field of olefin polymerization, and discloses a metallocene compound, a catalyst composition, and a method for preparing an ethylene-cyclic olefin copolymer. The metallocene compound has a structureas shown in formula (1), and in formula (1) M is a tetravalent transition metal atom; and X1 and X2 are each independently a halogen atom, an alkyl having 1 to 10 carbon atoms, an aromatic group having 6 to 12 carbon atoms or an N,N-dialkylamine group having 2 to 8 carbon atoms. Using the catalyst composition of the present invention in the preparation of an ethylene-cyclic olefin copolymer has the advantages of high catalytic activity, good copolymerization performance, and high molecular weight of an obtained polymer.