Metallocene Catalyst Allyltrimethylsilane Ligand Copolymerization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for a metallocene catalyst for olefin polymerization that offers high activity and enhanced copolymerizability, capable of producing resins with high molecular weight and excellent physical properties.
Innovation Solution
A transition metal compound with a unique structure, represented by Formula A, is introduced, comprising titanium, zirconium, or hafnium coordinated with specific ligands and cocatalyst compounds, supported on carriers like silica or alumina, to form a catalyst with improved polymerization characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional metallocene catalysts are used, then polymerization activity is maintained, but copolymerizability and molecular weight are limited
Solution Approach 1:
The patent applies local quality by introducing specific substituents (allyltrimethylsilane) at particular positions on the cyclopentadienyl ligand. This localized modification creates specific steric and electronic environments at the active site, enhancing copolymerizability while maintaining uniform molecular weight distribution through controlled monomer insertion
2Quantity of substance
If Ziegler-Natta catalysts are used, then high molecular weight polymers can be produced, but active sites are non-uniform leading to broad molecular weight distribution
Solution Approach 1:
The patent changes the chemical parameters of the metallocene catalyst by introducing electron-donating allyltrimethylsilane substituents on the cyclopentadienyl ligand. This parameter change enhances the catalyst's ability to produce high molecular weight polymers while maintaining the single-site characteristic that ensures uniform molecular weight distribution
3Manufacturing precision
If metallocene catalysts with narrow molecular weight distribution are used, then uniform polymer properties are achieved, but copolymerization activity is insufficient
Solution Approach 1:
The patent creates a composite catalyst system combining the metallocene complex with specific ligands (allyltrimethylsilane-substituted cyclopentadienyl) and cocatalysts. This composite structure synergistically enhances copolymerization activity while preserving the narrow molecular weight distribution characteristic of metallocene catalysts
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 achieves controlled polymer physical properties and maintains activity, enabling the production of high molecular weight resins with enhanced copolymerizability and uniform molecular weight distribution.
Implementation Method 1
A transition metal compound for a catalyst for olefin polymerization and a catalyst for olefin polymerization comprising the same
Data Source
AI summary
The present invention relates to a transition metal compound for a catalyst for olefin polymerization and to a catalyst for olefin polymerization comprising the same. Specifically, the present invention relates to a transition metal compound for an olefin polymerization catalyst in which an allyltrimethylsilane substituent is introduced into the cyclopentadienyl group and to a catalyst for olefin polymerization comprising the same.