Resin Composition
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Solution Overview
Problem
Food packaging containers using resin compositions with modified starch and polyvinyl alcohol face issues with high adhesion to metal rolls during production, insufficient oxygen barrier properties, and low impact strength under low humidity, leading to breakage and spoilage.
Innovation Solution
A resin composition comprising 50-98% modified starch, 2-50% polyvinyl alcohol, 0.1-10% polyoxyalkylene, and optionally 0-5% polyol plasticizer, which reduces adhesion to metal rolls and enhances oxygen barrier and impact strength while maintaining resistance to folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydrous composition with high oxygen barrier property is used, then oxygen barrier property is improved, but adhesion to metal roll increases causing sticking and breakage
Solution Approach 1:
The invention changes the chemical composition parameters of the resin by incorporating polyoxyalkylene (0.1-10 parts by mass) and polyol plasticizer (0-5 parts by mass) into the modified starch-polyvinyl alcohol system. This compositional modification reduces the polarity and hydrogen bonding capacity of the resin, thereby decreasing adhesion to metal rolls while preserving the oxygen barrier properties through the maintained starch-polyvinyl alcohol matrix structure.
2Reliability
If resin composition is optimized for oxygen barrier property, then oxygen barrier property is improved, but resistance to folding deteriorates
Solution Approach 1:
The invention creates a composite resin system combining modified starch, polyvinyl alcohol, polyoxyalkylene, and polyol plasticizer. The modified starch and polyvinyl alcohol provide oxygen barrier properties, while the polyoxyalkylene and polyol plasticizer contribute flexibility and toughness. This composite structure achieves synergistic effects where the material simultaneously exhibits high oxygen barrier property and improved resistance to folding through the combined properties of its components.
3Reliability
If film is optimized for oxygen barrier property, then oxygen barrier property is improved, but impact strength under low humidity deteriorates
Solution Approach 1:
The invention modifies the resin composition parameters by adding polyol plasticizer (0-5 parts by mass) which increases the free volume and chain mobility of the polymer matrix. This compositional change maintains the oxygen barrier properties through the starch-polyvinyl alcohol framework while improving impact strength under low humidity conditions by reducing brittleness and enhancing energy absorption capacity through the plasticizer's molecular-level effects.
Data Source
AI summary
Provided is a resin composition capable of forming a coated product that exhibits low adhesion to a metal roll during production and is superior in oxygen barrier property and capable of forming a film or sheet superior in oxygen barrier property, impact strength under low humidity and color tone. The resin composition of the present invention contains 50 to 98 parts by mass of a modified starch (A), 2 to 50 parts by mass of a polyvinyl alcohol (B), 0.1 to 10 parts by mass of a polyoxyalkylene (C), and optionally 0 to 5 parts of a polyol plasticizer (D), wherein the total content of the (A), (B), (C) and (D) is 100 parts by mass.