Titanium Biphenylphenol Catalysts for Molecular Weight Control
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Solution Overview
Problem
Existing polymerization catalysts produce high molecular weight polymers, incorporate excessive comonomer, and suffer from high catalyst productivity, leading to reactor operability issues.
Innovation Solution
Development of titanium biphenylphenol polymerization precatalysts that, when activated, produce lower molecular weight polymers with reduced comonomer incorporation and lower catalyst productivity, improving reactor operability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional polymerization catalysts are used, then high molecular weight polymers are produced, but reactor operability deteriorates due to excessive comonomer incorporation and high catalyst productivity
Solution Approach 1:
The patent modifies the chemical structure of the catalyst ligand by introducing specific substituent groups (R1-R16) with varying electronic and steric properties. These parameter changes in the catalyst structure directly influence the polymerization behavior, achieving lower molecular weight polymers with controlled comonomer incorporation while maintaining reactor operability
Solution Approach 2:
The catalyst system employs a composite structure combining titanium center with a complex biphenylphenol ligand system featuring carbazole groups and various substituent combinations. This composite catalyst design enables simultaneous control over multiple polymerization parameters, resolving the contradiction between molecular weight control and reactor operability
2Productivity
If conventional catalysts are used, then high catalyst productivity is achieved, but reactor fouling increases
Solution Approach 1:
By systematically varying the substituent parameters (R groups) on the catalyst ligand, the patent optimizes the balance between catalyst productivity and polymer properties. The specific electronic and steric parameters of the substituents control the rate of polymerization and the extent of comonomer incorporation, thereby reducing reactor fouling while maintaining acceptable productivity levels
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 titanium biphenylphenol catalysts achieve lower molecular weight polymers, less comonomer incorporation, and enhanced reactor operability compared to conventional catalysts, facilitating easier processing and reducing fouling risks.
Implementation Method 1
contacting, under activating conditions, a titanium biphenylphenol polymerization precatalyst of Formula I with an activator so as to activate the titanium biphenylphenol polymerization precatalyst of Formula I, thereby making the titanium biphenylphenol polymerization catalyst
Implementation Method 2
polymerizing an olefin monomer in a single gas-phase polymerization reactor in presence of the titanium biphenylphenol polymerization catalyst to make a polyethylene composition
Data Source
AI summary
Embodiments of the present disclosure directed towards titanium biphenylphenol polymerization precatalysts of Formula (I).