mXDA-IPA Polyamide Blend for Gas Barrier Packaging
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Solution Overview
Problem
There is a need for polymeric materials with high gas barrier properties and oxygen scavenging capabilities to extend the shelf life of packaged foods and beverages, as existing packaging materials do not effectively prevent gas permeation and oxidation.
Innovation Solution
A slow crystallizing polyamide composition is developed, comprising a first polyamide with crystallizable homopolymer, copolymer, or nanocomposite, and a second polyamide with a m-xylylene diamine moiety, isophthalic acid, and a polyamide monomeric precursor, optionally including a clay and an oxidizable polydiene with a metal salt catalyst, to create a high barrier layer with oxygen scavenging capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a barrier plastic layer with low permeation to oxygen and CO2 is used, then gas barrier properties are improved, but the material thickness must be increased to achieve sufficient barrier performance
Solution Approach 1:
The patent changes the chemical composition parameters of the polyamide by incorporating specific monomers (m-xylylene diamine, isophthalic acid, and aromatic diamine) to achieve optimal gas barrier properties. This allows achieving low permeation rates without increasing thickness, as the molecular structure itself provides enhanced barrier performance.
Solution Approach 2:
The patent creates a composite polyamide system combining multiple functional components: crystallizable polyamide homopolymer/copolymer for structural integrity, m-xylylene diamine/isophthalic acid copolymer for barrier properties, and aromatic diamine monomer for oxygen scavenging capability. This composite approach achieves multiple functions simultaneously in a single material layer.
2Duration of action of stationary object
If oxygen scavenging capability is added to packaging materials, then shelf life is extended, but material complexity increases due to additional components and processing requirements
Solution Approach 1:
The patent merges the oxygen scavenging function directly into the polyamide matrix by incorporating aromatic diamine monomer units that can react with oxygen. This integration eliminates the need for separate oxygen scavenging layers or additives, achieving shelf life extension while minimizing material complexity.
Solution Approach 2:
The polyamide composition performs multiple functions simultaneously: provides structural integrity through crystallizable polyamide, delivers gas barrier properties through m-xylylene diamine/isophthalic acid copolymer, and enables oxygen scavenging through aromatic diamine monomer. This multi-functionality reduces the need for separate specialized components.
3Ease of manufacture
If slow crystallization is utilized to improve adhesion and clarity, then processing performance is improved, but production speed may be reduced due to extended crystallization time
Solution Approach 1:
The patent adjusts crystallization parameters by controlling cooling rates during processing. The slow crystallization characteristic of the specific polyamide blend allows for optimized processing conditions that enhance adhesion and clarity while maintaining efficient production speeds through controlled manufacturing parameters.
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 composition exhibits excellent gas barrier properties, reducing oxygen and CO2 permeation, and extends the shelf life of packaged products by effectively scavenging oxygen and maintaining product freshness.
Implementation Method 1
a barrier plastic layer which has low permeation to oxygen and/or carbon dioxide
Implementation Method 2
ascorbic acid derivatives as well as sulfites, bisulfites, and phenolics, can be oxidized by molecular oxygen, and can thus serve as an oxygen scavenging material
Data Source
AI summary
High gas barrier, delamination-resistant polyamide compositions suitable for extended shelf-life packaging applications are provided. Also provided are polyamide compositions exhibiting high oxygen scavenging capability. The polyamide compositions comprise mXDA-IPA containing copolymers which provide excellent properties to the complete polyamide compositions. Also provided are direct blends of the polyamide compositions with other polymers. The polyamide products are particularly suited for producing barrier packaging articles such as monolayer or multi-layer films, sheets, thermoformed containers and molded bottles. Such articles are useful in a variety of oxygen-sensitive food, beverage, pharmaceutical, and health care product packaging applications.