Fluorine-Free Pulp Coating Composition for Grease and Water Resistance
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Solution Overview
Problem
The foodservice packaging industry seeks alternative wet end chemistries that do not use fluorinated compounds to achieve grease and water resistance in pulp molded articles, as fluorinated compounds raise health concerns and are being phased out due to bioaccumulation concerns.
Innovation Solution
A pulp molded article comprising at least 95% natural fiber, 0.15% alkyl ketene dimer (AKD), 0.1% to 1% petroleum wax based aqueous emulsion, and less than 1% vinyl acetate-vinyl alcohol polymer, which provides grease resistance without fluorinated compounds, and is suitable for food contact and compostable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorinated compounds are used to provide grease and water resistance, then the functional resistance is achieved, but health concerns and environmental risks arise due to bioaccumulation
Solution Approach 1:
The patent changes the chemical composition parameters by replacing fluorinated compounds with alternative substances including alkyl ketene dimer (AKD) at 0.15-1.1%, petroleum wax-based aqueous emulsion at 0.1-1%, and vinyl acetate-vinyl alcohol polymer at less than 1%. This parameter substitution maintains grease and water resistance while eliminating harmful fluorinated compounds from the composition
Solution Approach 2:
The patent employs food-safe coating formulations and biodegradable materials that are designed for single-use food packaging applications. These materials provide the necessary protective function during use and then decompose safely, avoiding long-term environmental accumulation issues associated with fluorinated compounds
2Reliability
If fluorinated compounds are used to ensure grease resistance, then the functional performance is maintained, but the compounds are bio accumulative and pool in compost
Solution Approach 1:
The patent modifies the chemical composition by substituting fluorinated compounds with biodegradable alternatives. The specific parameter changes include using AKD (0.15-1.1%), petroleum wax emulsion (0.1-1%), and vinyl acetate-vinyl alcohol polymer (<1%), which maintain grease resistance while being compatible with composting processes and not accumulating in soil
Solution Approach 2:
The patent converts the previously harmful fluorinated compounds into beneficial biodegradable materials that can safely decompose in composting environments. The alternative chemicals provide the same functional grease resistance while transforming from harmful persistent substances into beneficial compost-compatible materials that do not accumulate in the environment
3Object-affected harmful factors
If alternative chemistries are used to replace fluorinated compounds, then environmental safety is improved, but achieving similar grease and water resistant properties becomes challenging
Solution Approach 1:
The patent employs a composite material system combining multiple substances: natural fiber (at least 95%), alkyl ketene dimer (0.15-1.1%), petroleum wax-based aqueous emulsion (0.1-1%), and vinyl acetate-vinyl alcohol polymer (less than 1%). This composite approach leverages the complementary properties of each component to achieve both environmental safety and effective grease and water resistance
Solution Approach 2:
The patent merges multiple functional components into a unified coating formulation. The combination of AKD for water resistance, petroleum wax emulsion for grease resistance, and vinyl acetate-vinyl alcohol polymer for adhesion and food safety creates a synergistic system that achieves the required protective properties while maintaining environmental compatibility
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 achieves effective grease and water resistance for food packaging without using fluorinated compounds, ensuring safety for human consumption and reducing environmental risks by eliminating fluorinated compounds in compost operations.
Implementation Method 1
A pulp molded article comprising at least 95% natural fiber, 0.15% alkyl ketene dimer (AKD), 0.1% to 1% petroleum wax based aqueous emulsion
Implementation Method 2
petroleum wax based aqueous emulsion
Data Source
AI summary
A food-safe composition and resulting article with grease and water resistance properties comprised of a petroleum wax based aqueous emulsion, a food-safe coating formulation, and an alkyl ketene dimer (AKD), wherein the composition exhibits grease and water resistant properties without a fluorinated compound present in the composition. A method of making the composition and a method of using the composition to form pulp molded articles such as food-safe containers and other pulp-based food packaging and utensils are provided.