Polyelectrolyte Complex Barrier for Plasticizer Migration
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Solution Overview
Problem
Plasticizer migration in plasticized plastics leads to undesirable reduction in adhesive forces, particularly at higher temperatures, and poses safety concerns in food packaging, necessitating a barrier to prevent plasticizer penetration into adjacent layers and materials.
Innovation Solution
Application of a polyelectrolyte complex barrier formed from anionic and cationic polymers on the surface of plasticizer-containing substrates, which can be achieved through pre-coating with a composition containing the polyelectrolyte complex or by forming it in situ on the substrate using water-in-water emulsion polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a plasticizer-containing substrate is used to provide flexibility and desired physical properties, then the material achieves improved workability and flexibility, but plasticizer migration occurs into adjacent layers and materials causing reduction in adhesive forces and potential safety issues
Solution Approach 1:
The patent applies a barrier layer composed of polyelectrolyte complexes between the plasticizer-containing substrate and adjacent layers. This intermediary layer prevents direct contact and diffusion of plasticizers into other materials, thereby blocking the harmful migration effect while allowing the substrate to maintain its flexibility and workability properties
Solution Approach 2:
The patent uses a thin film barrier layer made of polyelectrolyte complexes that conforms to the substrate surface. This flexible thin film provides effective plasticizer containment without compromising the mechanical properties or flexibility of the underlying plasticizer-containing material
2Ease of operation
If the plasticizer content in the substrate is increased to enhance flexibility, then the desired physical properties are improved, but the migration speed of plasticizer increases rapidly with temperature
Solution Approach 1:
The polyelectrolyte complex barrier layer acts as a temperature-resistant intermediary that blocks plasticizer diffusion pathways. Even at elevated temperatures where migration speed would normally increase, the barrier layer maintains its integrity and prevents plasticizer penetration into adjacent layers
3Reliability
If a barrier layer is applied to prevent plasticizer migration, then adhesive forces are maintained and safety is ensured, but the substrate structure and manufacturing process become more complex
Solution Approach 1:
The patent employs a thin film barrier layer that adds minimal structural complexity while providing effective plasticizer containment. The thin film nature minimizes the additional layers and material volume required, keeping the overall substrate structure relatively simple despite the added functionality
Solution Approach 2:
The barrier layer is formed from polyelectrolyte complexes, which are composite structures formed by electrostatic complexation between oppositely charged polymers. This composite material approach provides effective barrier properties through the synergistic interaction of the polymer components
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 polyelectrolyte complex significantly enhances the resistance of the substrate surface to plasticizer penetration, maintaining adhesive strength and ensuring physiological safety in food packaging, even under elevated temperatures.
Implementation Method 1
their ability to migrate, which occurs through diffusion, vapor pressure and convection processes
Implementation Method 2
polyelectrolyte complexes, which are formed from anionic polymer and cationic polymer
Data Source
AI summary
The invention relates to the use of polyelectrolyte complexes, particularly those which are formed from anionic polymers and cationic polymers, as plasticizer barriers. The invention also relates to plasticizer-containing substrates and the production thereof, wherein the plasticizer-containing substrates are coated with at least one coating that has at least one polyelectrolyte complex.