Solid Catalyst Component for Olefin Polymerization Stiffness
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Solution Overview
Problem
Highly stereoregular olefin polymers produced by existing methods are insufficient in stiffness, particularly for injection-molded articles, which require superior stiffness.
Innovation Solution
A solid catalyst component for olefin polymerization comprising titanium, magnesium, halogen, and hydrocarbyloxy groups, produced through a process involving the steps of preparing a suspension, heating, filtering, and washing, and then contacting with organoaluminum compounds and external electron donors to enhance stereoregularity and stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a polymerization catalyst is used to produce highly stereoregular olefin polymer, then stereoregularity is improved, but stiffness of injection-molded article is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the catalyst by incorporating specific ratios of titanium compounds (TiCl4, Ti(OiPr)4), organometallic compounds (AlR3, AlR2Cl), and electron donors (internal and external). This parameter optimization enables simultaneous achievement of high stereoregularity (CXS ≤ 0.5%) and superior stiffness in injection-molded articles through controlled polymerization.
Solution Approach 2:
The patent employs a composite catalyst system combining multiple components: titanium compounds as catalyst core, organometallic compounds (aluminum-based) as co-catalysts, internal electron donors (e.g., phthalic acid esters), and external electron donors (e.g., silane compounds). This composite approach creates synergistic effects that enhance both stereoregularity and mechanical stiffness properties.
2Ease of manufacture
If existing polymerization catalyst process is used, then olefin polymer is produced, but stiffness requirement for injection-molded articles is not met
Solution Approach 1:
The patent optimizes process parameters including temperature (0-100°C), pressure (1-10 MPa), and catalyst composition ratios to produce polymers with enhanced stiffness. The specific parameter settings enable the polymer to meet both manufacturability and mechanical performance requirements for injection-molded articles.
Solution Approach 2:
The patent performs preliminary activation of the catalyst system before polymerization by incorporating internal and external electron donors in specific sequences. This preliminary action ensures the catalyst is fully activated and configured to produce polymer with optimal stiffness properties from the outset.
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 results in olefin polymers that can be molded into articles with superior stiffness, achieving higher stereoregularity and improved mechanical properties.
Implementation Method 1
a solid catalyst component for olefin polymerization, comprising titanium atoms, magnesium atoms, halogen atoms and hydrocarbyloxy groups
Implementation Method 2
contacting the solid catalyst component, an organoaluminum compound and an external electron donor
Implementation Method 3
filtering the suspension, thereby obtaining a filtrate; measuring a concentration of titanium atoms contained in the filtrate
Data Source
AI summary
A solid catalyst component for olefin polymerization, comprising titanium atoms, magnesium atoms, halogen atoms and hydrocarbyloxy groups, wherein the following filtrate contains titanium atoms in a concentration of 0.08 mg-Ti/ml-filtrate or lower, measured according to a method comprising the steps of (1) preparing a suspension of the solid catalyst component for olefin polymerization in heptane having a concentration of 0.1 g-solid catalyst component/ml-suspension, (2) heating the suspension at 70° C. for 30 minutes under stirring, (3) filtering the suspension, thereby obtaining a filtrate, and (4) measuring a concentration of titanium atoms contained in the filtrate; and a production process of the solid catalyst component.