Transition metal compound, catalyst composition comprising same, and method for producing olefin polymer using catalyst composition
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Solution Overview
Problem
Existing catalyst systems for olefin polymerization, such as Ziegler-Natta and metallocene, face issues with solubility, corrosion, and reduced activity at high temperatures, leading to non-uniform polymer composition and difficulty in producing high molecular weight polymers.
Innovation Solution
A transition metal compound with a controlled specific functional group, represented by Formula 1, is introduced to enhance solubility in non-aromatic hydrocarbons, allowing for high catalytic activity and easy injection in solution polymerization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If metallocene catalyst system is used to achieve homogeneous catalysis with single active site, then molecular weight distribution and composition distribution are narrowed, but catalytic activity is rapidly reduced at high temperature of 100°C or more
Solution Approach 1:
The patent modifies the catalyst system by changing the cocatalyst from traditional methylaluminoxane to a boron-based cocatalyst (Formula 11-14), which fundamentally alters the catalytic mechanism. This parameter change enables the catalyst to maintain high activity at temperatures of 100°C or more while preserving the homogeneous catalysis characteristics and uniform polymer composition distribution.
Solution Approach 2:
The patent creates a composite catalyst system combining a specific transition metal compound (Formula 1) with a boron-based cocatalyst (Formula 11-14). This composite catalyst composition achieves synergistic effects, maintaining both the uniformity of polymer composition and high catalytic activity at elevated temperatures, overcoming the limitations of individual components.
2Productivity
If ANSA-type metallocene-based catalyst with Cl functional group is used to improve high-temperature activity, then octene-injection and high-temperature activity are improved, but corrosion problems occur depending on process materials
Solution Approach 1:
The patent replaces the harmful Cl functional group with a boron-based cocatalyst system that eliminates corrosion issues. The boron-based cocatalyst (Formula 11-14) provides the necessary high-temperature activity and octene-injection capability without the corrosive properties of chlorine-containing compounds, converting a harmful characteristic into a beneficial non-corrosive alternative.
3Object-affected harmful factors
If ANSA-type metallocene-based catalyst substituted with dimethyl is used to avoid corrosion, then corrosion problem is avoided, but solubility is poor making it difficult to inject into polymerization process
Solution Approach 1:
The patent introduces a boron-based cocatalyst (Formula 11-14) as an intermediary substance that facilitates the solubility and injectability of the catalyst system. This cocatalyst acts as a mediator between the transition metal compound and the polymerization process, enabling easy injection into the reaction system while maintaining non-corrosive properties.
4Productivity
If Ziegler-Natta catalyst system is used to achieve high activity for ethylene polymerization, then catalytic activity is high, but molecular weight distribution and composition distribution are broad and non-uniform
Solution Approach 1:
The patent replaces the heterogeneous Ziegler-Natta catalyst system with a homogeneous transition metal catalyst system (Formula 1) combined with a boron-based cocatalyst. This substitution transforms the catalytic mechanism from heterogeneous to homogeneous, resulting in uniform polymer composition distribution while maintaining high catalytic activity through the synergistic interaction of the catalyst components.
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 transition metal compound improves solubility and maintains catalytic activity, enabling the production of high molecular weight olefin polymers with uniform composition and high yield, suitable for commercial applications.
Implementation Method 1
a transition metal compound having improved solubility by introducing a controlled specific functional group... capable of preparing polyethylene having a narrow molecular weight distribution and an uniform composition distribution
Implementation Method 2
metallocene catalyst system composed of a metallocene compound of transition metals of Group 4 in the periodic table... and methylaluminoxane, which is a cocatalyst
Implementation Method 3
improved solubility by introducing a controlled specific functional group... significantly improved solubility in a non-aromatic hydrocarbon
Data Source
AI summary
The present invention provides a transition metal compound, a catalyst composition comprising same, and a method for producing an olefin polymer using the catalyst composition. A transition metal compound having a specific functional group at a specific position, according to the present invention, has high solubility and catalytic activity, and thus a method for producing an olefin polymer by using said transition metal compound can produce an olefin polymer having excellent physical properties through a simple process.