Metallocene Complex with Furyl Substituents for Olefin Polymerization
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Solution Overview
Problem
Conventional metallocene catalysts face challenges in achieving high uptake efficiency of ethylene and α-olefin, leading to low molecular weight copolymers and difficulties in producing ethylene/propylene copolymers with desired ethylene content, which affects the impact resistance and moldability of polypropylene-based materials.
Innovation Solution
A metallocene complex with specific substituents at the 5-position of the indenyl ring, such as furyl or thienyl groups, is used to improve the uptake efficiency of ethylene and α-olefin, allowing for the production of high molecular weight rubber components and propylene homopolymers with enhanced melting points and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional Ziegler-Natta type catalyst is used for copolymerization, then impact resistance is improved by adding rubber components, but low molecular weight oligomer components are generated causing smoke, malodor, and anti-blocking property deterioration
Solution Approach 1:
The patent changes the catalyst system from conventional Ziegler-Natta type to metallocene type catalyst, which fundamentally alters the polymerization mechanism and eliminates oligomer formation while maintaining impact resistance through controlled copolymer composition
2Manufacturing precision
If metallocene type catalyst is used to improve polymerization control, then isotactic polypropylene can be obtained, but uptake efficiency of ethylene and α-olefin is low resulting in low molecular weight copolymers
Solution Approach 1:
The patent optimizes specific parameters of the metallocene catalyst including the indenyl ring substituents (furyl or thienyl groups at 5-position), ligand structure, and metal center composition to simultaneously achieve high ethylene/α-olefin uptake efficiency and high molecular weight copolymer production while maintaining polymerization control
3Manufacturing precision
If copolymerization is carried out with greatly different monomer gas composition ratio to achieve desired ethylene content, then ethylene/α-olefin content in copolymer can be controlled, but production efficiency decreases and equipment restrictions occur
Solution Approach 1:
The patent changes the catalyst's monomer reactivity parameters through specific molecular design (indenyl ring with furyl/thienyl substituents), which enables the catalyst to maintain high activity and selectivity with conventional monomer gas composition ratios, eliminating the need for extreme composition adjustments and improving production efficiency
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 use of this metallocene complex significantly improves the production of propylene-based polymers with improved flexibility, impact resistance, and molecular weight, addressing the limitations of conventional catalysts in terms of ethylene content and polymer properties.
Implementation Method 1
a metallocene complex, which has high uptake efficiency of ethylene and can produce copolymerized rubber component of ethylene-propylene having high molecular weight
Data Source
AI summary
A metallocene complex by which high uptake efficiency of ethylene and/or α-olefin can be obtained compared with the conventional metallocene catalyst, and rubber component having high molecular weight can be polymerized, and polymerization method of olefin. Metallocene complex (metallocene complex having furyl or thienyl group in which substituent exists at 5-position of indenyl ring, and substituent may exist at 2-position of indenyl ring, and the like) represented by the general formula [I], the catalyst for olefin polymerization characterized by comprising said metallocene complex, and polymerization method of olefin characterized in that polymerization or copolymerization of olefin is carried out using said polymerization catalyst for olefin, and the like.