Resin Composition Impact Resistance via Intermediary Polymer
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Solution Overview
Problem
Saponified ethylene-vinyl ester copolymers exhibit poor impact resistance due to poor affinity with multilayer structure polymer particles, leading to cracking issues despite their excellent solvent resistance and gas barrier properties.
Innovation Solution
A resin composition comprising a saponified ethylene-vinyl ester copolymer, a rubber-like graft polymer, and a polyalkylene ether unit-containing polymer is developed, enhancing dispersibility and interface areas to improve impact resistance, with specific weight ratios and additives like glycidyl-group-containing (meth)acrylate polymer further optimizing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If saponified ethylene-vinyl ester copolymer is used as packaging material, then gas barrier property and solvent resistance are improved, but impact resistance deteriorates due to cracking
Solution Approach 1:
The invention uses a composite resin composition comprising saponified ethylene-vinyl ester copolymer (A), rubber-like graft polymer (B), and polyalkylene ether unit-containing polymer (C). This composite structure combines the gas barrier properties of EVOH with the impact resistance of rubber particles and polyalkylene ether polymer, resolving the contradiction between reliability and strength.
2Strength
If multilayer structure polymer particles are blended in saponified ethylene-vinyl ester copolymer, then impact resistance is improved, but affinity between components is poor leading to limited effectiveness
Solution Approach 1:
The polyalkylene ether unit-containing polymer (C) acts as an intermediary component that enhances compatibility and affinity between the saponified ethylene-vinyl ester copolymer (A) and rubber-like graft polymer (B). This mediator improves the dispersion and interfacial adhesion, making the composite structure more effective.
Solution Approach 2:
The invention optimizes the compositional parameters by controlling the weight ratios of components (A), (B), and (C) within specific ranges. This parameter optimization ensures proper affinity and dispersion while achieving the desired impact resistance.
3Strength
If rubber-like graft polymer is added to improve impact resistance, then dispersibility needs to be improved, but poor dispersibility limits impact absorbing efficiency
Solution Approach 1:
The polyalkylene ether unit-containing polymer (C) serves as a dispersing agent and intermediary that enhances the dispersibility of rubber-like graft polymer (B) in the saponified ethylene-vinyl ester copolymer (A) matrix. This improved dispersibility increases the interfacial area and impact absorbing efficiency.
Data Source
AI summary
The present invention provides a resin composition which comprises: (A) a saponifed ethylene-vinyl ester copolymer; (B) a rubber-like graft polymer; and (C) a polyalkylene ether unit-containing polymer. The inventive resin composition, which employs the saponfied ethylene-vinyl ester copolymer, is excellent in impact resistance.