Supported Catalyst for Cyclic Olefin Polymerization
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Solution Overview
Problem
Existing catalyst systems for cyclic olefin polymerization are inefficient due to excessive catalyst residue, high costs associated with expensive cocatalysts like MAO, and low polymerization yields, which affect the quality and transparency of the resulting polymers.
Innovation Solution
A catalyst composition for cyclic olefin polymerization is developed, comprising a palladium or cobalt-containing metal precursor compound, an amine compound represented by specific formulas, and a cocatalyst compound, which enables in situ and ex situ catalyst formation, reducing metal catalyst residue and enhancing polymer quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high catalyst to monomer ratio (1:100 to 1:250) is used for polymerization, then the polymerization reaction can proceed, but a large amount of catalyst residue remains in the final polymer causing deterioration and reduced light transmittance
Solution Approach 1:
The invention extracts and removes the harmful catalyst residue from the polymerization system by using a supported catalyst where the active metal species is immobilized on a solid support. This allows the catalyst to be easily separated from the polymer product through filtration, preventing catalyst residue contamination while maintaining high polymerization activity.
Solution Approach 2:
The invention introduces a solid support as an intermediary carrier for the metal catalyst. This support acts as a mediator that holds the active catalyst species while allowing easy separation from the reaction mixture. The supported catalyst structure enables high catalyst activity without the harmful effects of free metal catalyst residues in the final polymer product.
2Reliability
If methylaluminoxane (MAO) or organic aluminum is used as a cocatalyst, then catalyst activation can be achieved, but excessive use of expensive MAO increases cost and the polymer becomes colored with poor transparency
Solution Approach 1:
The invention replaces expensive MAO with a more economical and environmentally benign cocatalyst system based on organic boron compounds. This substitution maintains catalyst activation functionality while avoiding the harmful side effects of MAO, such as polymer discoloration and excessive cost. The supported metal catalyst system works effectively with these alternative cocatalysts to produce high-quality transparent polymers.
3Reliability
If a separate step for converting catalyst precursor to activated catalyst is required, then catalyst activation can be controlled, but the process complexity and time increase
Solution Approach 1:
The invention combines the catalyst precursor preparation and activation steps into a single integrated process. The metal salt is directly supported on the solid carrier in the presence of the cocatalyst, forming the active catalyst species in situ. This merging of steps eliminates the need for separate activation procedures, reducing process complexity and time while maintaining reliable catalyst activation.
Solution Approach 2:
The invention performs preliminary preparation of the supported metal catalyst where the metal salt is pre-supported on the carrier before the polymerization reaction. This preliminary action ensures the catalyst is in the correct form and location for immediate activation during polymerization, eliminating the need for in-process activation steps and simplifying the overall procedure.
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 composition achieves high catalytic activity with low residual metal catalyst, enabling the production of cyclic olefin-based oligomers and polymers with improved optical and heat-resistant properties without the need for additional purification or catalyst synthesis steps, thus providing an economical and environmentally friendly process.
Implementation Method 1
a complex formed by a coordination bond between a palladium or cobalt-containing metal precursor compound and an amine compound
Implementation Method 2
catalyst composition for cyclic olefin polymerization... capable of enabling a cyclic olefin-based oligomer or a cyclic olefin-based polymer to be prepared from a cyclic olefin-based monomer
Data Source
AI summary
The present invention relates to a catalyst composition for cyclic olefin polymerization, and a method for preparing a cyclic olefin-based oligomer or a cyclic olefin-based polymer by using same, and, more specifically, to: a catalyst composition for cyclic olefin polymerization, the composition forming catalytically active species inside and outside the same reaction system during polymerization of cyclic olefin-based monomers, thereby enabling an oligomer or a polymer to be prepared from the cyclic olefin-based monomers; and a method for preparing a cyclic olefin-based oligomer or a cyclic olefin-based polymer by using same.