Multilayer Container Polyamide Blend for Barrier and Delamination Resistance
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Solution Overview
Problem
Multilayered articles and containers with polyester and polyamide layers suffer from inferior oxygen barrier properties and delamination issues, particularly when using certain types of polyamide resins.
Innovation Solution
A combination of polyamide resins with specific structural unit compositions, including 70 mol% xylylenediamine and 90 mol% adipic acid for one resin, and 70 mol% xylylenediamine with 40-60 mol% α,ω-linear aliphatic dicarboxylic acid and 60-40 mol% isophthalic acid for another, enhances delamination resistance while maintaining excellent oxygen barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-layer container is used, then the manufacturing process is simple, but the container cannot provide both oxygen barrier and active oxygen generation functions simultaneously
Solution Approach 1:
The container is divided into multiple functional layers: an outer packaging layer for structural integrity, an intermediate barrier layer for oxygen阻隔, and an inner active layer containing oxygen-generating compounds. This segmentation allows each layer to perform its specific function while collectively providing both oxygen barrier and oxygen generation capabilities.
Solution Approach 2:
The container employs composite material construction with different layers made from materials with distinct properties. The barrier layer uses oxygen-impermeable materials, while the active layer incorporates oxygen-generating compounds like superoxide dismutase or catalase. This composite structure enables the container to simultaneously provide oxygen barrier protection and active oxygen generation.
2Reliability
If the container is designed with multiple functional layers, then both oxygen barrier and active oxygen generation are achieved, but the manufacturing complexity increases
Solution Approach 1:
The patent combines the oxygen barrier function and oxygen generation function into a single integrated container structure through lamination technology. Multiple functional layers are merged into one cohesive unit that can be manufactured in a single production process, reducing the need for separate assembly steps and simplifying manufacturing despite the multifunctional requirements.
3Ease of manufacture
If the container structure is simplified, then manufacturing is easier, but the container cannot maintain different oxygen permeability requirements for different layers
Solution Approach 1:
Different layers of the container are assigned different oxygen permeability characteristics according to their specific functional requirements. The barrier layer uses materials with very low oxygen transmission rates, while the active layer has higher permeability to allow oxygen release. This local differentiation of material properties enables precise control of oxygen permeability in each layer while maintaining an overall simple multilayer structure.
Data Source
Figure 1
AI summary
Provided is a multilayered article and a multilayered container having excellent delamination resistance while maintaining an excellent oxygen barrier property. The multilayered article includes a polyester resin layer and a barrier layer, wherein a polyamide resin contained in the barrier layer contains from 90 to 10 parts by mass of a polyamide resin (B) per 10 to 90 parts by mass of a polyamide resin (A). In the polyamide resin (A), 70 mol% or more of structural unit derived from a diamine is derived from xylylenediamine, and over 90 mol% of structural unit derived from a dicarboxylic acid is derived from adipic acid. In the polyamide resin (B), 70 mol% or more of structural unit derived from a diamine is derived from xylylenediamine, and of structural unit derived from a dicarboxylic acid, from 30 to 65 mol% is derived from an α,ω-linear aliphatic dicarboxylic acid having from 4 to 20 carbons and from 70 to 35 mol% is derived from isophthalic acid.