PET Container Gas Barrier Additives for CO2 Retention
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Solution Overview
Problem
Polyethylene terephthalate (PET) containers have limited carbon dioxide and oxygen barrier properties, restricting their use in smaller sizes and for oxygen-sensitive products, as they lead to a shorter shelf life of carbonated beverages due to high permeability, which existing solutions either make too expensive or degrade mechanical properties.
Innovation Solution
Incorporating a gas barrier enhancing additive with specific chemical structures into PET compositions to create stretch blow molded containers with improved barrier properties without compromising mechanical properties or clarity, using a combination of PET and additives that undergo transesterification reactions to enhance gas barrier performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If PET is used for smaller containers, then container size is reduced, but carbon dioxide barrier performance deteriorates leading to higher loss rate
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition of PET through incorporation of barrier-enhancing compounds (1,3,5-triazine derivatives and phosphorus compounds). This changes the molecular structure parameters of the polymer to reduce gas permeability, allowing smaller containers to maintain adequate CO2 barrier performance despite increased surface area to volume ratio
Solution Approach 2:
The patent creates composite materials by combining PET with specific additive compounds (1,3,5-triazine derivatives and phosphorus compounds). This composite approach enhances the barrier properties of the base PET material, enabling smaller container sizes while maintaining acceptable carbon dioxide retention through the synergistic effect of the composite composition
2Loss of substance
If barrier technologies are applied to enhance gas barrier, then carbon dioxide barrier performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs cost-effective additive compounds (1,3,5-triazine derivatives and phosphorus compounds) that can be incorporated into PET during standard manufacturing processes. These relatively inexpensive chemical additives provide barrier enhancement without requiring expensive alternative packaging materials or complex multi-layer structures, making the solution economically viable for disposable beverage containers
Solution Approach 2:
The patent modifies the chemical parameters of PET through additive incorporation during conventional manufacturing processes. This approach allows barrier enhancement to be achieved through compositional changes rather than requiring expensive process modifications or alternative manufacturing technologies, maintaining ease of manufacture while improving barrier performance
3Loss of substance
If barrier additives are incorporated into PET, then gas barrier properties are enhanced, but mechanical properties and clarity may deteriorate
Solution Approach 1:
The patent carefully controls the concentration parameters of barrier-enhancing additives (1,3,5-triazine derivatives and phosphorus compounds) incorporated into PET. By optimizing the dosage levels, the patent achieves improved gas barrier properties while maintaining adequate mechanical strength and optical clarity, balancing multiple performance requirements through precise parameter control
Solution Approach 2:
The patent creates a composite material system where PET is combined with specific barrier additives (1,3,5-triazine derivatives and phosphorus compounds) in optimized ratios. This composite formulation achieves synergistic effects that enhance gas barrier properties while preserving the mechanical integrity and optical properties of the base PET material, resolving the contradiction between barrier enhancement and property maintenance
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 significantly enhances the gas barrier properties of PET containers, extending the shelf life of carbonated beverages and allowing for the packaging of oxygen-sensitive products while maintaining acceptable physical properties and clarity.
Implementation Method 1
using a combination of PET and additives that undergo transesterification reactions to enhance gas barrier performance
Implementation Method 2
The relatively high permeability of PET to carbon dioxide limits the use of smaller PET containers for packaging carbonated soft drinks
Data Source
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AI summary
A container comprising a polyester composition with enhanced carbon dioxide and oxygen barrier properties is provided. The polyester composition comprises a polyester and a gas barrier enhancing additive. In a particular embodiment, the gas barrier enhancing additive comprises a compound having the chemical formula: X-(X1 )s-COO-(X2)t- X3-(X4)u-OOC-(X5)v-X6 or X-(X1)s-OOC-(X2)t -X3-(X4)u-COO-(X5)v-X6