Polyester-Polyamide Packaging Body with Oxidation Accelerator
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Solution Overview
Problem
Packaging materials made from polyesters like PET and MXD6 face challenges in balancing gas barrier properties and visibility, as high MXD6 content can lead to cloudiness, while low content results in reduced oxygen absorption performance, and phosphorus content affects the induction period and coloration.
Innovation Solution
A packaging body composed of a polyester resin, a polyamide resin, and an oxidation reaction accelerator, with a phosphorous atom concentration of 5 to 500 ppm, where the polyamide resin content is within a specific range, ensuring an oxygen transmission rate of 0.006 cc/(package · day · 21278 Pa (0.21 atm)) or less and a haze value of 8% or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the content of polyamide resin (MXD6) is increased to improve oxygen absorption performance, then the oxygen transmission rate decreases, but the haze value increases and visibility of contents deteriorates
Solution Approach 1:
The patent optimizes the phosphorus content parameter in MXD6 polyamide resin to a specific range (5-500 ppm) to achieve the desired balance between oxygen absorption performance and visibility. By precisely controlling this chemical parameter, the resin exhibits both low oxygen transmission rate and acceptable haze value, resolving the contradiction between these two properties.
Solution Approach 2:
The patent uses a composite resin composition containing polyester resin and polyamide resin (MXD6) with controlled phosphorus content. This composite material combines the advantages of both resins while mitigating their individual drawbacks, achieving both excellent oxygen barrier properties and acceptable transparency for content visibility.
2Stability of the object's composition
If the phosphorus content in MXD6 is increased to suppress coloration during processing, then the induction period until oxygen absorption performance is exhibited becomes longer
Solution Approach 1:
The patent identifies and optimizes the phosphorus content parameter within a specific range (5-500 ppm) to simultaneously achieve both coloration resistance and acceptable induction period. This precise parameter control allows the material to maintain compositional stability during processing while exhibiting oxygen absorption performance within a reasonable time frame.
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 solution effectively suppresses oxidation deterioration and maintains visibility of contents without relying on phosphorus content, suitable for preserving foods, beverages, and pharmaceutical products.
Implementation Method 1
it may be considered that the aforementioned oxygen absorption performance is exhibited due to a series reaction (oxidation reaction) including generation of a radical to be caused due to abstraction of a hydrogen atom from a methylene chain adjacent to an arylene group of MXD6
Implementation Method 2
the polyesters are not always satisfactory in gas barrier properties against oxygen, a carbon dioxide gas, or the like
Data Source
Figure 1
AI summary
Provided are [1] a packaging body consisting of a resin composition containing a polyester resin (A), a polyamide resin (B), and an oxidation reaction accelerator (C), wherein when a thickness of the packaging body is defined as d (µm), and an average long diameter, an average short diameter, and a volume fraction of dispersed particles of the polyamide resin (B) in the packaging body are defined as L (µm), W (µm), and Vf, respectively, the following expression (1A) is satisfied; an oxygen transmission rate after a lapse of 100 hours after preparing of the packaging body is 0.01 [cc/(package · day · 0.21 atm)] or less; and a haze value is 8% or less, and [2] a method for preserving goods by filling in a packaging body containing a polyester resin (A), a polyamide resin (B), and an oxidation reaction accelerator (C), wherein a content of the polyamide resin (B) in the packaging body is 2.0 to 3.5% by mass, and when an oxygen transmission rate of the packaging body after a lapse of 100 hours after preparing of the packaging body is defined as X [cc/(package · day · 0.21 atm)], a volume of the packaging body is defined as V [L], and a mass of the packaging body is defined as M [g], the following expression (1B) is satisfied. 10<d×L×Vf/2W<120 X/2.5×V2/M−8<0.3