Olefin Polymerization Catalyst Components for Higher Isotacticity
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Solution Overview
Problem
Existing Ziegler-Natta catalyst systems for olefin polymerization lack sufficient stereospecificity and crystallinity, particularly when phthalates are not used as electron donors, necessitating improved catalyst components for higher isotacticity and crystallinity.
Innovation Solution
A solid catalyst component comprising magnesium halide, titanium compound with a Ti-halogen bond, and an electron donor of formula (I) with specific R1, R2, R3, and R4 groups, including various hydrocarbon and halogen combinations, is used to enhance polymerization performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional Ziegler-Natta catalyst systems without phthalates are used, then the catalyst system is simpler and does not require phthalate electron donors, but the stereospecificity and crystallinity of the polymer are insufficient
Solution Approach 1:
The patent changes the chemical parameters of the electron donor from traditional phthalates to compounds of formula (I) with specific structural parameters (R1-R4 groups, X being Si or C). This parameter change in the electron donor structure enables higher stereosspecificity without requiring the complex phthalate system, resolving the contradiction between manufacturing precision and device complexity
Solution Approach 2:
The patent creates a composite catalyst system combining magnesium halide, titanium compound, and the novel electron donor of formula (I). This composite material approach achieves enhanced stereosspecificity and crystallinity through the synergistic interaction of components, avoiding the need for phthalates while improving polymer quality
2Manufacturing precision
If traditional Ziegler-Natta catalyst systems without phthalates are used, then the catalyst preparation is simpler, but the crystallinity of the polymer is insufficient
Solution Approach 1:
The patent modifies the electron donor parameters by using compounds of formula (I) with specific R1-R4 hydrocarbon groups and halogen substitutions. This parameter change in the electron donor structure promotes higher crystallinity in the polymer product while maintaining relatively simple catalyst preparation procedures, thus resolving the contradiction between manufacturing precision and ease of manufacture
3Manufacturing precision
If higher isotacticity is achieved through improved catalyst components, then the polymer quality is enhanced, but the catalyst component structure becomes more complex
Solution Approach 1:
The patent achieves higher isotacticity by optimizing the parameters of the electron donor (formula (I)), specifically the R1-R4 groups and the X atom selection. This targeted parameter optimization in the electron donor allows high isotacticity to be achieved without unnecessarily complicating the overall catalyst component structure, resolving the contradiction between manufacturing precision and device complexity
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 new catalyst component achieves higher isotacticity and crystallinity in olefin polymerization, addressing the limitations of traditional systems by improving stereospecificity and polymer properties.
Implementation Method 1
at least an electron donor of formula (I) wherein R1 and R2 are, independently, C1-C8 alkyl groups, X is Si or C, R3 and R4 groups, independently, are selected from the group consisting of hydrogen, C1-C20 hydrocarbon groups and halogens
Data Source
AI summary
A solid catalyst component for the polymerization of olefins made from or containing a magnesium halide, a titanium compound having at least a Ti-halogen bond, and at least an electron donor compound selected from 1,3-diethers.