Bimetallic Activator Complex for Olefin Polymerization
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Solution Overview
Problem
Conventional olefin polymerization catalyst systems face challenges in achieving high temperature efficiency, consistent polymer composition, and minimizing residual activator ions that affect the electrical properties of the final polymer products.
Innovation Solution
A catalyst system incorporating a Group IV metal-ligand complex and a bimetallic activator ionic complex with a specific anion and countercation structure, which activates the procatalyst efficiently and degrades intentionally to reduce residual ions in the polymer, enhancing solubility and electrical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If weakly-coordinating or non-coordinating anions are used as activators, then catalytic efficiency is increased, but electrical resistance of the polymer decreases due to residual activator anions
Solution Approach 1:
The patent changes the chemical parameters of the anion by introducing electron-withdrawing groups (such as -CF3, -F, -Cl) at specific positions in the anion structure. This modifies the anion's coordinating ability and diffusion characteristics, allowing it to maintain catalytic efficiency while reducing residual ion diffusion that causes electrical loss in the final polymer product.
2Productivity
If the activator remains intact in the final polymer, then catalytic function is maintained, but electrical properties of the polymer deteriorate
Solution Approach 1:
The patent introduces specific structural modifications at local positions of the anion (such as adding electron-withdrawing groups at ortho positions of phenyl rings) to create different functional zones: one region maintains catalytic activity while another region controls diffusion and electrical properties. This local differentiation allows simultaneous optimization of both polymerization performance and electrical characteristics.
3Productivity
If conventional activators are used, then polymerization proceeds efficiently, but consistent polymer composition at high temperature is difficult to achieve
Solution Approach 1:
The patent creates a composite activator system combining a specific cation (such as ammonium, sulfonium, or phosphonium) with a specially designed anion containing electron-withdrawing groups. This composite structure provides synergistic effects where the cation maintains polymerization activity while the modified anion stabilizes the catalytic complex at elevated temperatures, enabling consistent polymer composition even at high reaction temperatures.
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 system enables high temperature operation, consistent polymer production, and improved electrical properties by minimizing ion diffusion and residual activator ions, leading to reduced electrical loss and increased insulation efficiency.
Implementation Method 1
Brønsted acid salts that are fully ionized are capable of transferring a proton to form a cationic derivative of such Group IV metal complexes
Implementation Method 2
the size of the ion and the charge of the ion, the interaction of the ion with the surrounding medium, and the dissociation energy of the ion with available counterions will affect the ion's ability to diffuse through a surrounding medium, such as a solvent, a gel, or a polymer material
Data Source
AI summary
Processes of polymerizing olefins. The process includes polymerizing contacting ethylene and a (C3-C40)alpha-olefin comonomer in the presence of a catalyst system comprising a procatalyst and a bimetallic activator complex. The bimetallic activator complex includes an anion and a countercation. The anion having a structure according to formula (I).