Multimodal Ethylene Polymer Blend for Shrink Resistance
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Solution Overview
Problem
Incumbent ethylene polymers used in oriented articles like artificial turf exhibit high shrinkage, leading to performance issues such as curling and twisting due to thermally induced elastic-memory effects, which are exacerbated by blending with metallocene-catalyzed elastomeric polymers, necessitating a solution for improved dimensional stability and tenacity.
Innovation Solution
A multimodal ethylene polymer composition comprising a homogeneous linear ethylene polymer, a heterogeneous branched ethylene polymer, and a high-density ethylene polymer, blended in specific ratios and processed to achieve reduced shrinkage and enhanced tenacity and residual elongation, with a density below 0.925 g/cm³ and specific melt index ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If metallocene-catalyzed elastomeric polymers are blended with ethylene polymers to improve flexibility and softness, then the article becomes more compliant and comfortable, but thermal shrinkage increases and dimensional stability deteriorates
Solution Approach 1:
The patent changes the molecular weight distribution parameters by using multimodal blends with specific weight percentages (Component A: 40-70 parts, Component B: 30-60 parts, Component C: 10-30 parts) to achieve optimal balance between flexibility and dimensional stability
Solution Approach 2:
The patent creates a composite polymer system combining three different ethylene polymer components with complementary properties: Component A (homogeneous linear) provides flexibility, Component B (heterogeneous branched) provides softness, and Component C (high density) provides dimensional stability, achieving synergistic effects
2Stability of the object's composition
If high-density ethylene polymers are used to reduce shrinkage and improve dimensional stability, then the article maintains its shape better, but tenacity and residual elongation decrease
Solution Approach 1:
The patent optimizes the density parameter by controlling the blend composition to achieve an overall density between 0.900-0.945 g/cm³, which balances dimensional stability and mechanical properties
Solution Approach 2:
The patent combines high-density Component C (providing dimensional stability) with lower-density Components A and B (providing tenacity and elongation), creating a composite that achieves both properties through synergistic interaction
3Strength
If ethylene polymers are processed to achieve high orientation and crystallinity for improved strength, then the article becomes stronger and more durable, but shrinkage resistance deteriorates due to elastic-memory effects
Solution Approach 1:
The patent changes the thermal and mechanical parameters by controlling processing temperature, stretching ratio, and annealing conditions to achieve optimal orientation without excessive elastic-memory effects
Solution Approach 2:
The multimodal blend composition provides a balanced structure where Component A contributes to flexibility, Component B to softness, and Component C to dimensional stability, enabling the material to maintain strength while resisting shrinkage
Data Source
AI summary
The invention provides an oriented article, for example, a yarn, tape or filaments made from a three component polymer blend.