Olefin Polymerization Catalyst System Broadening Molecular Weight Distribution
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Solution Overview
Problem
Conventional catalysts for olefin polymerization fail to produce olefin polymers with a broad molecular weight distribution while maintaining high stereoregularity, leading to limited moldability and application of the final products.
Innovation Solution
A catalyst system comprising a solid catalyst component made from a magnesium compound, tetravalent titanium halide, and an electron donor, combined with an organoaluminum compound and an oligomer of an organosilicon compound, which allows for the polymerization of olefins to achieve a broad molecular weight distribution and high stereoregularity in a high yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional catalysts for olefin polymerization are used, then high stereoregularity can be maintained, but the molecular weight distribution remains narrow
Solution Approach 1:
The patent uses a composite catalyst system comprising multiple components: a solid catalyst component containing magnesium, titanium, and halogen; an organoaluminum compound; and an organosilicon compound with specific structural features (cyclopentyl, cyclopentenyl, cyclopentadienyl groups or derivatives). This composite catalyst structure enables simultaneous achievement of high stereoregularity and broad molecular weight distribution, resolving the technical contradiction between manufacturing precision and adaptability.
2Adaptability or versatility
If multi-stage polymerization is applied to obtain broad molecular weight distribution, then the polymer properties improve, but the process complexity and cost increase
Solution Approach 1:
The patent segments the catalyst system into distinct functional components (solid catalyst component with specific metal compounds, organoaluminum compound, and organosilicon compound with specific groups) that work synergistically to achieve broad molecular weight distribution in a single polymerization stage, eliminating the need for complex multi-stage processes while maintaining improved polymer properties.
3Productivity
If conventional catalyst components are used, then the catalyst activity is high, but the molecular weight distribution is narrow
Solution Approach 1:
The patent modifies the chemical parameters and structural characteristics of the catalyst components, specifically using organosilicon compounds with cyclopentyl, cyclopentenyl, cyclopentadienyl groups or derivatives, which changes the catalytic behavior to produce broad molecular weight distribution while maintaining high catalyst activity and productivity.
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 system effectively produces olefin polymers with a broad molecular weight distribution and high stereoregularity, improving the moldability and application range of the polymers, while simplifying the polymerization process and reducing the need for complex multi-stage processes.
Implementation Method 1
a catalyst for olefin polymerization comprising: (A) a solid catalyst component prepared by causing (a) a magnesium compound, (b) a tetravalent titanium halide, and (c) an electron donor compound to come in contact with each other
Data Source
AI summary
A catalyst for olefin polymerization comprising (A) a solid catalyst component prepared by causing (a) a magnesium compound, (b) a tetravalent titanium halide compound, and (c) an electron donor compound to come in contact with each other, (B) an organoaluminum compound of the general formula R1pAlQ3-p, and (C) an oligomer of an organosilicon compound of the following chemical formula; R4—(R2R3SiO)m—R5 can produce olefin polymers having higher stereoregularity and a broader molecular weight distribution in a higher yield than conventional catalysts.