Solid Titanium Catalyst Composition for Stereoregular Propylene
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Solution Overview
Problem
Existing olefin polymerization catalysts struggle to produce propylene polymers with high stereoregularity and broad molecular weight distribution in a highly active manner, limiting their heat resistance and rigidity properties.
Innovation Solution
A solid titanium catalyst component containing a polyvalent ester compound with a specific alicyclic structure, comprising titanium, magnesium, and halogen, is used to enhance polymer stereoregularity and molecular weight distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional olefin polymerization catalysts are used, then polymerization activity is maintained, but stereoregularity and molecular weight distribution are insufficient
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by introducing a specific cyclic multiple-ester-group-containing compound as electron donor. This compound has a unique molecular structure with multiple ester groups in a cyclic arrangement, which fundamentally alters the catalyst's electronic and steric properties, enabling simultaneous achievement of high stereoregularity and broad molecular weight distribution without sacrificing polymerization activity
Solution Approach 2:
The patent creates a composite catalyst system combining titanium compound, magnesium halide, and the novel cyclic multiple-ester-group-containing compound. This composite structure synergistically integrates the functions of each component: titanium provides catalytic activity, magnesium halide supports the structure, and the cyclic ester compound controls stereoregularity and molecular weight distribution, resolving the contradiction between activity and precision
2Manufacturing precision
If catalysts with high stereoregularity are used, then polymer rigidity and heat resistance improve, but molecular weight distribution becomes narrow
Solution Approach 1:
The cyclic multiple-ester-group-containing compound introduces specific steric and electronic parameters that simultaneously control chain growth and termination processes. The multiple ester groups in cyclic arrangement create a unique microenvironment at the active site that promotes both high stereoregularity and broad molecular weight distribution through coordinated control of polymerization kinetics
3Productivity
If polymerization activity is increased, then productivity improves, but stereoregularity and physical properties deteriorate
Solution Approach 1:
The composite catalyst system maintains high polymerization activity through the titanium-magnesium-halide core structure while the cyclic multiple-ester-group-containing compound modulates the electronic environment to preserve stereoregularity. The synergistic interaction between components ensures that increased activity does not compromise precision
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 enables the production of propylene polymers with high stereoregularity and broad molecular weight distribution, improving moldability, rigidity, and heat resistance.
Implementation Method 1
a solid titanium catalyst component, a catalyst for olefin polymerization containing the solid titanium catalyst component, and an olefin polymerization method
Data Source
AI summary
The solid titanium catalyst component (I) of the present invention contains titanium, magnesium, halogen, and a cyclic multiple-ester-group-containing compound (a) represented by the following formula (1).