Polyolefin Filament Composition Tenacity Processing Balance
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Solution Overview
Problem
Current polyolefin compositions for filaments and fibers lack optimal balance of density, melt flow index, and flexural modulus, which affects their performance in textile and geotextile applications, particularly in ropes and nets, where high tenacity and resistance are required.
Innovation Solution
A polyolefin composition comprising 85-99% ethylene polymer with specific density and melt flow index ranges, combined with 1-15% butene-1 polymer, optimized for density, melt flow, and flexural modulus, to produce filaments with enhanced tenacity and elongation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyolefin composition uses higher density ethylene polymer to improve strength, then tenacity increases, but melt flow index decreases making processing difficult
Solution Approach 1:
The patent applies parameter changes by precisely controlling the density (952-965 kg/m³) and melt flow index (10-35 g/10 min) of the ethylene polymer component to achieve an optimal balance between tenacity and processability. This specific parameter range allows the material to maintain sufficient strength while remaining easy to process during filament formation.
Solution Approach 2:
The patent uses composite materials by combining ethylene polymer (85-99% by weight) with butene-1 polymer (1-15% by weight) to create a polyolefin composition that achieves superior tenacity while maintaining good processability. The composite structure allows the ethylene component to provide strength and the butene component to enhance flexibility and processing characteristics.
2Ease of manufacture
If polyolefin composition uses lower density ethylene polymer to improve processability, then melt flow index increases, but tenacity decreases
Solution Approach 1:
The patent resolves this contradiction by establishing a specific parameter range for ethylene polymer density (952-965 kg/m³) and melt flow index (10-35 g/10 min) that simultaneously achieves both good processability and high tenacity. This optimized parameter range prevents the material from being either too difficult to process or lacking in strength.
Solution Approach 2:
The patent employs composite materials with ethylene polymer (85-99% by weight) and butene-1 polymer (1-15% by weight) where the ethylene component provides the necessary strength and the butene component contributes to flexibility and processability, achieving a balanced performance that neither component could achieve alone.
3Stability of the object's composition
If polyolefin composition increases butene-1 content to improve flexibility, then elongation at break increases, but flexural modulus decreases
Solution Approach 1:
The patent applies parameter changes by controlling the butene-1 polymer content within a specific range (1-15% by weight) to achieve the desired balance between elongation at break and flexural modulus. This controlled composition allows the material to exhibit both flexibility and structural strength without excessive softening.
Solution Approach 2:
The patent uses composite materials combining ethylene polymer (85-99% by weight) and butene-1 polymer (1-15% by weight) where the ethylene component maintains high flexural modulus and structural integrity while the butene component provides elongation and flexibility, achieving a harmonious balance between these opposing requirements.
Data Source
AI summary
A polyethylene composition made from or containing:A) from 85% to 99% by weight of an ethylene polymer composition made from or containing:AI) from 80 to 95% by weight of an ethylene polymer component, having a density DI from 952 to 965 kg/m3 and a MIF of from 10 to 35 g/10 min.; andAII) from 5 to 20% by weight of an ethylene polymer component, having a density DII from 940 to 950 kg/m3 and a MIF value lower than the MIF value of AI);wherein the amounts of AI) and AII) are referred to the total weight of AI)+AII); andB) from 1% to 15% by weight of a butene-1 polymer component.