Polyolefin Elastomer Composition for Absorbent Article Hysteresis
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Solution Overview
Problem
Conventional elastic film materials for absorbent articles, such as those made from styrenic block copolymers and polyurethanes, while providing favorable hysteresis performance, often increase manufacturing costs and complexity, leaving room for improvement without significant cost additions.
Innovation Solution
A semi-crystalline metallocene polyolefin elastomer composition with a crystalline melting point of at least 75°C, blended with suitable polyolefin elastomers like Vistamaxx and Versify, which incorporates additives for stability and tailored properties, such as antioxidants and nucleating agents, to enhance hysteresis and mechanical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional elastic film materials (styrenic block copolymers and polyurethanes) are used, then favorable hysteresis performance is achieved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent changes the material parameters by using polyolefin elastomers with specific crystalline melting points (at least 75°C) and controlled comonomer content (5-20 mol%) to achieve favorable hysteresis performance through material composition optimization rather than complex manufacturing processes
Solution Approach 2:
The patent employs composite material strategies by blending polyolefin elastomers with specific polymers (polyethylene, polypropylene, or other polyolefins) in controlled ratios to achieve the desired hysteresis performance while maintaining manufacturing simplicity
2Reliability
If conventional elastic film materials (styrenic block copolymers and polyurethanes) are used, then favorable hysteresis performance is achieved, but manufacturing cost increases
Solution Approach 1:
The patent adopts polyolefin elastomers which are generally more cost-effective materials compared to styrenic block copolymers and polyurethanes, achieving favorable hysteresis performance through material selection rather than expensive conventional elastomers
Solution Approach 2:
The patent optimizes material parameters including crystalline melting point (at least 75°C), comonomer content (5-20 mol%), and blend ratios to achieve cost-effective production of elastomer compositions with desired hysteresis performance
3Reliability
If polyolefin elastomers with crystalline melting point of at least 75°C are used, then improved hysteresis properties and robustness to tensile stress are achieved, but material complexity increases
Solution Approach 1:
The patent carefully controls material parameters including crystalline melting point (at least 75°C), comonomer content (5-20 mol%), and blend ratios to achieve improved hysteresis properties while maintaining relatively simple material composition through precise parameter optimization
Solution Approach 2:
The patent uses composite material approaches by blending polyolefin elastomers with specific polymers in controlled ratios, achieving robustness to tensile stress and improved hysteresis through straightforward binary or ternary blends rather than complex multi-component systems
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 elastomer composition achieves improved hysteresis properties and robustness to tensile stress at a relatively low cost, providing a suitable fit and endurance for absorbent articles, with a crystalline melting point that supports stability at high temperature storage conditions.
Implementation Method 1
Hysteresis behavior, i.e. the load to unload performance in tensile testing, is a good measure of how well the product performs
Implementation Method 2
a semi-crystalline metallocene polyolefin elastomer composition with a crystalline melting point of at least 75°C
Data Source
AI summary
Disclosed is an elastomer composition comprising polyolefin elastomer material which exhibits improved hysteresis properties, said elastomer composition having the following properties:(1) an average integrated enthalpy sum of no greater than 17 J/g according to the Thermal Analysis Method defined herein;(2) an average integrated enthalpy ratio of from 0.6 to 300 according to the Thermal Analysis Method defined herein;(3) an unload stress at 75% strain of above 0.8 MPa according to the Hysteresis Test defined herein; and(4) a load stress/unload stress ratio at 75% strain of 1 to 2.6 according to the Hysteresis Test defined herein.