Solid Titanium Catalyst for Broad Olefin Polymer Distribution
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Solution Overview
Problem
Existing catalysts for olefin polymerization fail to produce polymers with broad molecular weight distribution and high melt tension, which are essential for high-speed stretching and molding processes, while also being cost-effective and simple to produce.
Innovation Solution
A solid titanium catalyst component containing a specific polycarboxylic acid ester compound with an alicyclic structure is used, along with an organometallic compound and an electron donor, to produce olefin polymers with broad molecular weight distribution and high stereoregularity, suitable for high-speed stretchability and moldability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a catalyst with narrow molecular weight distribution is used, then stereoregularity is improved, but melt tension decreases
Solution Approach 1:
The patent changes the chemical structure parameters of the electron donor from conventional phthalic acid esters to cyclic carboxylic acid ester compounds with specific molecular weight ranges (500-2000 g/mol) and structural features (cyclic skeleton with ester groups). This parameter change broadens the molecular weight distribution of the polymer while maintaining high stereoregularity, thereby resolving the contradiction between stereoregularity and melt tension.
Solution Approach 2:
The patent creates a composite catalyst system combining titanium compound, magnesium compound, and cyclic carboxylic acid ester electron donor in specific ratios. This composite structure enables simultaneous achievement of narrow and broad molecular weight distribution components, producing polymers with both high stereoregularity and high melt tension through the synergistic effect of different catalyst components.
2Force
If multi-stage polymerization is used to broaden molecular weight distribution, then melt tension is improved, but process complexity increases
Solution Approach 1:
The patent extracts the molecular weight distribution control function from the multi-stage polymerization process and integrates it into a single-stage catalyst system. By incorporating cyclic carboxylic acid ester electron donors with specific structural features into the catalyst, the process achieves broad molecular weight distribution and high melt tension in one stage, eliminating the need for complex multi-stage processes.
Solution Approach 2:
The patent changes the catalyst composition parameters by introducing cyclic carboxylic acid ester electron donors with specific molecular weights (500-2000 g/mol) and structural characteristics. This parameter modification enables single-stage polymerization to produce polymers with broad molecular weight distribution, thereby simplifying the process while maintaining high melt tension.
3Productivity
If conventional electron donors are used, then catalyst activity is maintained, but molecular weight distribution remains narrow
Solution Approach 1:
The patent changes the molecular weight parameter of the electron donor to the specific range of 500-2000 g/mol and introduces cyclic structural features with ester groups. This parameter change broadens the molecular weight distribution of the resulting polymer while maintaining high catalyst activity, resolving the contradiction between productivity and molecular weight distribution.
Solution Approach 2:
The patent develops a composite catalyst system where cyclic carboxylic acid ester electron donors work synergistically with titanium and magnesium compounds. This composite structure maintains high catalyst activity while producing polymers with broad molecular weight distribution, overcoming the limitation of conventional electron donors that produce narrow distributions.
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 solution results in olefin polymers with improved rigidity, moldability, and high melt tension, enabling efficient high-speed processing and reducing production costs by simplifying the polymerization process.
Implementation Method 1
a catalyst for olefin polymerization containing the solid titanium catalyst component and an organometallic compound catalyst component (II)
Data Source
Figure 1
AI summary
The present invention relates to a solid titanium catalyst component containing magnesium, titanium, halogen and a specific ester compound; a catalyst for olefin polymerization containing the solid titanium catalyst component, an organometallic compound catalyst component and an electron donor where necessary; and a polymerization method of an olefin using the catalyst for olefin polymerization. According to the present invention, an olefin polymer having a high Mw/Mn value which is an index of the molecular weight distribution is obtained, even by a single-stage polymerization. Especially an olefin polymer having a high Mz/Mw which is a high content of high molecular weight components is obtained.