4-Methyl-1-Pentene Polymers with Uniform Molecular Weight
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Solution Overview
Problem
Conventional olefin-based polymers using Ziegler type catalysts have non-uniform molecular weight distributions, leading to deteriorated mechanical properties, while those using metallocene catalysts suffer from reduced thermal resistance due to heterogeneous bonding, necessitating the development of polymers with high thermal resistance and balanced properties.
Innovation Solution
The development of 4-methyl-1-pentene-based polymers with specific properties, including diad isotacticity of 70% or greater, weight average to number average molecular weight ratio of 1.0 to 3.5, and intrinsic viscosity of 0.5 dl/g or greater, prepared using metallocene catalysts, which also include copolymers and elastomers with tailored compositions for improved thermal and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If Ziegler type catalysts are used to prepare olefin-based polymers, then the polymers exhibit good mechanical properties and processability, but the molecular weight distribution becomes non-uniform, leading to deteriorated mechanical properties
Solution Approach 1:
The patent changes the catalyst type from Ziegler type to metallocene type, which fundamentally alters the polymerization mechanism to achieve uniform molecular weight distribution. This parameter change in catalyst chemistry enables precise control over polymer constitution while maintaining mechanical properties
Solution Approach 2:
The patent replaces the conventional Ziegler type catalyst system with a metallocene catalyst system, substituting one chemical mechanism for another that provides better control over molecular weight distribution and polymer uniformity
2Manufacturing precision
If metallocene catalysts are used to prepare olefin-based polymers, then the molecular weight distribution becomes uniform, but the thermal resistance deteriorates due to heterogeneous bonding
Solution Approach 1:
The patent applies local quality by introducing specific comonomers (4-methyl-1-pentene, ethylene, propylene) at controlled ratios to create localized homogeneous regions within the polymer structure. This compositional control eliminates heterogeneous bonding while preserving uniform molecular weight distribution, thereby maintaining both manufacturing precision and thermal resistance
Solution Approach 2:
The patent creates composite polymer structures by copolymerizing multiple olefins in specific ratios, forming a homogeneous composite material that combines the benefits of uniform molecular weight distribution with improved thermal resistance through controlled compositional homogeneity
3Stability of the object's composition
If conventional metallocene catalysts are used, then uniform polymer constitution is achieved, but heterogeneous bonding occurs, adversely affecting polymer properties
Solution Approach 1:
The patent changes the metallocene catalyst structure by introducing specific ligand combinations and metal centers (zirconium, hafnium, titanium) to modify the polymerization mechanism. This parameter change in catalyst chemistry eliminates heterogeneous bonding while maintaining uniform polymer constitution, thereby improving reliability
Solution Approach 2:
The patent uses specific metallocene catalysts as intermediaries that mediate the polymerization process to produce homogeneous copolymers. These catalyst intermediaries control monomer incorporation to prevent heterogeneous bonding, ensuring both constitutional uniformity and reliable polymer properties
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 resulting polymers exhibit excellent thermal resistance, mechanical properties, and processability, making them suitable for various applications such as injection molded articles, films, and non-woven fabrics with enhanced thermal and mechanical performance.
Implementation Method 1
olefin-based polymers are in general prepared using catalysts comprising transition metal compounds and organic aluminum compounds, that is, so-called Ziegler type catalysts
Data Source
AI summary
A novel olefin-based polymer has excellent thermal resistance, as well as excellent balance among various properties. The olefin-based polymer is an olefin-based polymer comprising 50 to 100% by weight of a constituent unit derived from 4-methyl-1-pentene, and 0 to 50% by weight of a constituent unit derived from at least one olefin selected from olefins having 2 to 20 carbon atoms except 4-methyl-1-pentene, and having the following properties: i) the diad isotacticity is 70% or greater, ii) the ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) as measured by gel permeation chromatography (GPC) is in the range of 1.0 to 3.5, and iii) the intrinsic viscosity [η] is 0.5 (dl/g) or greater.