Solid Titanium Catalyst for High Tacticity Olefin Polymers
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Solution Overview
Problem
Existing olefin polymerization catalysts lack high catalytic activity and stereospecificity for polymerizing or copolymerizing C3 or higher α-olefins, resulting in polymers with inadequate tacticity, crystallinity, and transparency, particularly for applications in films.
Innovation Solution
A solid titanium catalyst component containing titanium, magnesium, halogen, and a compound with two or more ether linkages, combined with an organometallic catalyst component, is used to polymerize or copolymerize C3 or higher α-olefins, achieving high catalytic activity and stereospecificity, and producing α-olefin polymers with excellent tacticity, crystallinity, and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional olefin polymerization catalysts are used, then polymerization can proceed, but catalytic activity and stereospecificity are insufficient
Solution Approach 1:
The patent employs a composite catalyst system comprising titanium compound, magnesium halide, and electron donor compound with two or more ether linkages. This composite structure synergistically enhances both catalytic activity and stereosspecificity, resolving the contradiction between productivity and reliability by integrating multiple functional components that work together to achieve superior polymerization performance.
Solution Approach 2:
The patent modifies the chemical structure of the electron donor compound by incorporating two or more ether linkages, which fundamentally changes the electronic and steric parameters of the catalyst system. This structural parameter change optimizes both the activity and stereospecificity of the catalyst, enabling simultaneous improvement in catalytic performance and polymer tacticity.
2Manufacturing precision
If conventional catalysts are used for C3 or higher α-olefin polymerization, then polymer production is achieved, but tacticity and crystallinity are inadequate
Solution Approach 1:
The introduction of electron donor compounds with two or more ether linkages fundamentally alters the stereochemical environment at the active site, enabling precise control over monomer insertion geometry. This parameter change in the catalyst structure directly improves tacticity while maintaining high crystallinity, resolving the contradiction between manufacturing precision and productivity.
Solution Approach 2:
The electron donor compound acts as an intermediary between the titanium compound and the α-olefin monomer, mediating the stereochemical course of polymerization. This intermediary component transmits stereochemical information from the catalyst structure to the growing polymer chain, ensuring high tacticity and crystallinity simultaneously.
3Illumination intensity
If conventional catalysts are used, then polymerization occurs, but transparency of the resulting polymer is insufficient
Solution Approach 1:
The patent modifies the catalyst structure by incorporating electron donor compounds with specific ether linkage configurations, which changes the stereochemical parameters of polymerization. This results in polymers with high isotacticity and regular structure, thereby improving transparency without requiring overly complex catalyst systems.
4Productivity
If conventional catalysts are used, then polymer production is achieved, but additional demineralization steps are required
Solution Approach 1:
The patent extracts and eliminates the need for demineralization steps by designing a catalyst system that produces polymers with inherently low mineral content and high purity. The refined catalyst composition and polymerization conditions directly yield polymers suitable for film applications without requiring additional purification processes, thereby improving productivity and reducing process 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 process produces α-olefin polymers with enhanced tacticity, crystallinity, and transparency, enabling the creation of films with improved releasability and reduced production costs due to higher catalytic activity compared to conventional catalysts, eliminating the need for a demineralization step.
Implementation Method 1
a catalyst containing a solid titanium catalyst component loading an electron donor selected from carboxylates including phthalates as typical examples, an alkylaluminum, and a silicon compound having at least one Si—OR serving as cocatalysts exhibits particularly excellent performances
Implementation Method 2
a copolymer containing 80 to 99.9 mass % of structural units derived from 4-methyl-1-pentene and 0.1 to 20 mass % of structural units derived from at least one C3-11 α-olefin
Data Source
AI summary
The present invention provides a process for producing an α-olefin polymer comprising polymerizing or copolymerizing (a) C3 or higher α-olefin (s) in the presence of an olefin polymerization catalyst comprising solid titanium catalyst component (I) containing titanium, magnesium, halogen, and a compound with a specific structure having two or more ether linkages and organometallic catalyst component (II) with high catalytic activity. In this process, particularly even in (co)polymerizing (a) higher olefin(s), demineralization is unnecessary. A 4-methyl-1-pentene-based polymer obtained by polymerization using the catalyst of the present invention is excellent in tacticity, transparency, heat resistance, and releasability, and the polymer is particularly suitable for a release film.