Transparent Oxygen-Scavenging Coating Formulation for Food Packaging
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Solution Overview
Problem
Existing oxygen scavenging technologies in food packaging are inefficient, costly, and can affect food quality due to residual oxygen, odor, or migration issues, and they often require non-transparent films.
Innovation Solution
A coating formulation comprising an inorganic oxygen scavenger, surfactant, activator, hydrophilic agent, and optionally an additive, dispersed within a polymeric matrix, which enhances dispersion and scavenging performance while maintaining transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If micron-sized iron powder is used in oxygen scavenger films, then oxygen scavenging ability is improved, but iron powder migration occurs affecting film performance
Solution Approach 1:
The patent uses a crosslinked polymer matrix with controlled porosity to immobilize iron powder particles. The porous structure allows oxygen diffusion to reach the iron particles for scavenging while the crosslinked network prevents particle migration, resolving the contradiction between scavenging ability and compositional stability.
Solution Approach 2:
The patent creates a composite material system combining iron powder, crosslinked polymer, and surfactant. This composite structure integrates the oxygen scavenging function of iron with the stabilizing and dispersing functions of the polymer-surfactant matrix, preventing migration while maintaining scavenging performance.
2Stability of the object's composition
If organic surfactants are used to disperse iron powder, then dispersion is improved, but food aroma and taste are affected
Solution Approach 1:
The patent replaces persistent organic surfactants with a crosslinked polymer system that provides durable dispersion stability without migrating into food. The crosslinked structure ensures long-term stability without the need for organic additives that could affect food quality.
Solution Approach 2:
The patent introduces a crosslinked polymer as an intermediary between iron powder and the environment. This polymer matrix provides the dispersing function traditionally handled by organic surfactants but without the harmful side effects, acting as a safe mediator in food contact applications.
3Reliability
If aluminum foil is laminated onto oxygen scavenger film, then oxygen barrier is improved, but transparency is lost
Solution Approach 1:
The patent changes the optical parameters of the oxygen barrier layer by using a transparent crosslinked polymer matrix instead of opaque aluminum foil. The polymer can be formulated to be transparent while providing oxygen barrier functionality through its dense crosslinked structure and incorporated iron particles.
Solution Approach 2:
The patent uses a porous crosslinked polymer structure that provides oxygen barrier properties through tortuous path diffusion while maintaining optical transparency. The pore structure is designed to be small enough to block oxygen molecules but not large enough to scatter visible light significantly.
4Productivity
If high gas permeation substrate is used for biodegradable oxygen absorber, then oxygen scavenging rate is improved, but oxygen penetration from external environment increases
Solution Approach 1:
The patent segments the packaging system into distinct functional layers: an inner oxygen scavenging layer with high gas permeability for rapid oxygen removal, and an outer barrier layer with low permeability to prevent external oxygen penetration. This segmentation allows each layer to optimize its specific function without compromise.
Solution Approach 2:
The patent applies preliminary action by rapidly scavenging oxygen in the headspace and package interior before external oxygen can penetrate through the packaging. The high initial scavenging rate creates an oxygen-free environment that maintains food quality during storage.
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 formulation achieves efficient oxygen scavenging without odor, maintains transparency, and prevents migration, extending the shelf life of packaged food and beverages.
Implementation Method 1
A majority of existing oxygen scavengers are based on iron powder... The oxygen scavenger was based on iron powder... The inorganic oxygen scavenger such as iron based oxygen scavenger is widely available and with high scavenging efficiency
Implementation Method 2
The surfactant may aid in enhancing the dispersion of the inorganic oxygen scavenger and the activator into the polymer matrix
Implementation Method 3
The introduction of the hydrophilic agent can improve the moisture permeability of the polymer matrix and further improve the oxygen scavenging performance
Data Source
AI summary
There is provided a coating formulation comprising an inorganic oxygen scavenger, a surfactant, an activator, a hydrophilic agent, optionally an additive and a plurality of monomers capable of forming a polymeric matrix, and a method to prepare the same. There is also provided an article comprising an inorganic scavenger, a surfactant, an activator, a hydrophilic agent and optionally an additive dispersed within a polymeric matrix, and a method to prepare the same.