Polysaccharide Barrier Coating for Paperboard Oxygen Resistance
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Solution Overview
Problem
Existing packaging materials, such as polymer films and aluminum layers, used to enhance barrier properties in fiber-based substrates like paper or paperboard, are costly, non-biodegradable, and difficult to recycle, leading to increased carbon dioxide emissions.
Innovation Solution
Aqueous barrier coating compositions comprising 50-99.9% by weight of anionic low molecular weight polysaccharides (DP 2-12) and 0.1-10% by weight of a polycationic polymer, which form efficient barrier films with high total solids content and low viscosity, enabling conventional coating methods and improved biodegradability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer layers (PE, PP, PET, EVOH) are used to create oxygen and liquid barriers, then barrier properties are improved, but production cost increases and biodegradability decreases
Solution Approach 1:
The patent changes the molecular weight parameter of polysaccharides to low molecular weight (DP 2-12), which fundamentally alters the viscosity characteristics and enables high solids content formulations. This parameter change allows achieving barrier properties without requiring thick polymer layers, thus reducing material cost and improving biodegradability
Solution Approach 2:
The patent creates a composite coating system combining anionic low molecular weight polysaccharides with polycationic polymers. This composite approach synergistically achieves excellent oxygen and grease barrier properties while using biodegradable materials, avoiding the need for costly and non-biodegradable synthetic polymer layers
2Reliability
If aluminum layers are used to improve oxygen and light barrier, then barrier properties are improved, but carbon dioxide load increases
Solution Approach 1:
The patent replaces permanent aluminum barrier layers with biodegradable polysaccharide-based coatings that provide comparable oxygen barrier properties. These organic coatings can be decomposed naturally, avoiding the persistent carbon footprint associated with aluminum production and disposal
3Reliability
If hemicellulose compositions are used to form barrier films, then oxygen and grease barrier properties are improved, but manufacturing efficiency decreases due to high viscosity
Solution Approach 1:
The patent fundamentally changes the molecular weight parameter of polysaccharides from high to low (DP 2-12), which dramatically reduces viscosity while maintaining or improving barrier properties. This enables high solids content formulations that can be applied efficiently using conventional coating methods, resolving the manufacturing efficiency problem
4Reliability
If multiple polymer layers are used to reduce oxygen transmission, then oxygen barrier is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple barrier functions (oxygen barrier, grease resistance, water repellency) into a single coating layer composed of polysaccharides and polycationic polymers. This eliminates the need for multiple separate polymer layers, simplifying the coating structure while maintaining comprehensive barrier protection
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 coating composition provides excellent oxygen and grease barrier properties while allowing for high total solids content and low viscosity, facilitating efficient application and reducing production costs and environmental impact.
Implementation Method 1
aqueous barrier coating compositions comprising 50-99.9% by weight of one or more anionic low molecular weight polysaccharide(s) having a degree of polymerization (DP) in the range of 2-12; 0.1-10% by weight of a polycationic polymer
Data Source
AI summary
The present invention relates to an aqueous barrier coating composition comprising: 50-99.9% by weight of one or more anionic low molecular weight polysaccharide(s) having a degree of polymerization (DP) in the range of 2-12; 0.1-10% by weight of a polycationic polymer; based on the total dry weight of the aqueous barrier coating composition.