Polypropylene Packaging Material with Spindle-Shaped Elastomer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Polypropylene-based packaging materials struggle to simultaneously achieve drop impact resistance, blocking resistance, slipperiness, and flavor barrier properties, especially at low temperatures, while maintaining appearance characteristics.
Innovation Solution
A polypropylene-based packaging material with a phase dispersion structure featuring a spindle-shaped polypropylene-based elastomer domain in a polypropylene matrix, combined with an ethylene-propylene block copolymer and homopolypropylene, which adjusts viscosity for improved moldability and surface roughness, is used. This material is integrated into a layered body with specific molecular weight ranges and compositions to enhance drop impact resistance, slipperiness, and flavor barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a propylene block copolymer is used to improve drop impact resistance, then impact resistance is improved, but blocking resistance deteriorates
Solution Approach 1:
The patent uses a composite material system consisting of propylene block copolymer blended with ethylene/α-olefin copolymer. This composite structure allows the propylene block copolymer to provide impact resistance while the ethylene/α-olefin copolymer component suppresses the negative effects on blocking resistance, achieving both properties simultaneously
Solution Approach 2:
The patent optimizes the composition ratio parameters of the propylene block copolymer and ethylene/α-olefin copolymer, and controls the molecular weight and composition parameters of the copolymer to achieve the desired balance between impact resistance and blocking resistance
2Strength
If a propylene block copolymer is used to improve drop impact resistance, then impact resistance is improved, but slipperiness deteriorates
Solution Approach 1:
The patent employs a composite material system combining propylene block copolymer with ethylene/α-olefin copolymer. This composite structure enables the material to exhibit both high impact resistance from the propylene block copolymer and good slipperiness from the ethylene/α-olefin copolymer component
3Weight of moving object
If film thickness is reduced for weight reduction, then weight is reduced, but drop impact resistance deteriorates
Solution Approach 1:
The patent optimizes the molecular weight parameters and composition ratios of the polypropylene resin and ethylene/α-olefin copolymer to achieve enhanced impact resistance at reduced thickness. By controlling the melting point and compositional parameters, the material maintains structural integrity even when films are made thinner
Solution Approach 2:
The composite material system allows for thinner film design while maintaining impact resistance. The synergistic combination of propylene block copolymer and ethylene/α-olefin copolymer provides the necessary mechanical properties at reduced material thickness
Data Source
AI summary
The disclosure relates to a polypropylene-based packaging material containing an ethylene-propylene block copolymer having a phase dispersion structure in which a resin containing polypropylene as a main component is a matrix and a spindle-shaped polypropylene-based elastomer is a domain, and can provide a packaging material having all of drop impact resistance at a low temperature condition, blocking resistance, slipperiness, and flavor barrier properties.