Fluorided Silica Supported Salan Catalysts for Olefin Polymerization
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Solution Overview
Problem
There is a need for new and improved supported catalyst systems for olefin polymerization to achieve specific polymer properties with enhanced catalyst operability, as existing systems fall short in producing polymers with desired properties.
Innovation Solution
The development of supported catalyst systems comprising a reaction product of fluorided silica, a transition metal catalyst compound, and an activator, where the catalyst compound is represented by a specific formula with coordinated ligands that maintain stability during polymerization, and the process involves contacting olefins with this catalyst system at controlled temperatures and pressures to produce polyolefins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional supported catalyst systems are used, then basic polymerization function is achieved, but catalyst activity and operability are insufficient for producing polymers with desired properties
Solution Approach 1:
The patent changes the chemical parameters of the support surface by introducing fluorinated silane groups, transforming the surface chemistry from conventional oxide surfaces to fluorinated surfaces. This parameter change enhances both catalyst activity and operability by creating optimal interaction between the support and catalyst species.
Solution Approach 2:
The patent creates a composite catalyst system combining fluorided silica support with transition metal catalyst compounds. The composite structure integrates the benefits of the fluorinated support (enhanced stability and activity) with the catalytic function of the metal complex, achieving superior performance compared to conventional single-material systems.
2Productivity
If catalyst activity is increased to improve polymerization efficiency, then productivity increases, but achieving specific polymer properties becomes more difficult
Solution Approach 1:
The patent applies local quality by creating specific fluorinated sites on the silica support surface that provide localized optimal environments for catalyst operation. The fluorinated silane groups create specific interaction zones that enhance catalyst activity while maintaining control over polymerization outcomes, allowing both high productivity and precise property control.
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
This approach enables the production of polyolefins with improved properties by enhancing catalyst activity and operability, leading to increased polymerization efficiency and specific property attainment.
Implementation Method 1
Supported catalyst systems comprising a reaction product of fluorided silica, a transition metal catalyst compound, and an activator
Data Source
AI summary
A catalyst system including the reaction product of a fluorided support, an activator, and at least a first transition metal catalyst compound; methods of making such catalyst systems, polymerization processes using such catalyst systems, and polymers made therefrom.