Olefin Polymerization Catalyst Using Non-Linear Alkyl Electron Donor
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Solution Overview
Problem
Existing catalysts for olefin polymerization, particularly those using dialkoxy magnesium carriers, face challenges in achieving wide molecular weight distribution, good stereospecificity, and processability while maintaining high polymerization activity and particle shape.
Innovation Solution
A solid catalyst component comprising a reaction product of a dialkoxy magnesium carrier, a titanium compound, and an internal electron donor, specifically a 2,3-di-non-linear-alkyl-2-cyano succinic acid diester or 2-isopropyl-2-(3-methylbutyl)-1,3-dimethoxy propane, in an inert solvent, which enhances polymer properties when used in olefin polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a dialkoxy magnesium carrier is used to prepare a catalyst component for olefin polymerization, then good particle shape and stereosspecificity are obtained, but the molecular weight distribution is wide and processability is poor
Solution Approach 1:
The patent changes the chemical structure parameter of the internal electron donor from conventional phthalates to 2-isopropyl-2-(3-methylbutyl)-1,3-dimethoxypropane. This structural parameter change fundamentally alters the catalyst's polymerization behavior, enabling simultaneous achievement of good particle shape, narrow molecular weight distribution, and excellent processability by modifying how the electron donor interacts with the titanium center during polymerization
2Productivity
If phthalate internal electron donors are used, then high polymerization activity and good stereosspecificity are achieved, but molecular weight distribution is wide and processability is poor
Solution Approach 1:
The patent changes the chemical structure parameter of the internal electron donor from conventional phthalates to 2-isopropyl-2-(3-methylbutyl)-1,3-dimethoxypropane. This structural parameter change fundamentally alters the catalyst's polymerization behavior, enabling simultaneous achievement of good particle shape, narrow molecular weight distribution, and excellent processability by modifying how the electron donor interacts with the titanium center during polymerization
3Manufacturing precision
If heating rate is controlled within 0.5-20°C/min to obtain solid catalyst component, then high isotacticity and bulk density are achieved, but fine powder content is high
Solution Approach 1:
The patent changes the chemical composition parameter by using 2-isopropyl-2-(3-methylbutyl)-1,3-dimethoxypropane as internal electron donor instead of conventional phthalates. This compositional change modifies the polymerization mechanism to produce polymers with better particle morphology and reduced fine powder content, while maintaining high isotacticity through the electron donor's stereospecific influence on the catalyst
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 wide molecular weight distribution, good stereospecificity, and improved processability of the resulting polymers, with low fine powder content and high polymerization activity, making it suitable for applications requiring high processability.
Implementation Method 1
a solid catalyst component comprising a reaction product of a dialkoxy magnesium carrier, a titanium compound and an internal electron donor in an inert solvent
Data Source
AI summary
Disclosed is a solid catalyst component for olefin polymerization. The catalyst component comprises a dialkoxy magnesium carrier, a titanium compound, and a product from an internal electron donor reacting in an inert solvent. The internal electron donor compound comprises a 2,3-di-non-linear-alkyl-2-cyano succinic acid diester compound as presented in formula I.