Oil and Grease-Resistant Paper Coatings Without Fluorinated Materials
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Solution Overview
Problem
Existing paper products struggle to achieve oil and grease resistance without using fluorinated substances, while maintaining compatibility with conventional coating equipment, printability, and repulpability, and avoiding processing issues.
Innovation Solution
A paper product with a substrate coated on one side by a barrier layer comprising a binder system with a latex and natural binder, and a pigment, formulated to have a Pigment Volume Concentration (PVC) below the Critical Pigment Volume Concentration (CPVC), along with a topcoat and optionally a precoat, to form a continuous film without fluorocarbon materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorinated substances are applied to achieve oil and grease resistance, then oil and grease resistance is improved, but human health and environmental safety deteriorate
Solution Approach 1:
The patent removes fluorinated substances from the coating formulation entirely, extracting the harmful component while maintaining the essential oil and grease resistance function through alternative materials (latex and natural binder system), directly resolving the contradiction between performance and safety
Solution Approach 2:
The patent employs conventional, readily available latex and natural binder materials that are biodegradable and environmentally friendly, replacing persistent fluorinated chemicals with shorter-lived, safer alternatives that achieve the same barrier function without long-term environmental harm
2Reliability
If barrier coatings with very high levels of polymers are applied to achieve oil and grease resistance, then oil and grease resistance is improved, but processing and converting issues worsen
Solution Approach 1:
The patent optimizes the polymer concentration parameter within a specific range (40-750 parts per 100 parts pigment) rather than using very high levels, and controls the Pigment Volume Concentration to maintain proper film formation. This parameter optimization allows the coating to achieve adequate barrier properties while remaining processable on conventional equipment without excessive viscosity or application difficulties
3Ease of manufacture
If appreciable levels of filler materials are utilized to mitigate processing issues, then ease of manufacture is improved, but oil and grease resistance performance deteriorates
Solution Approach 1:
The patent carefully controls the Pigment Volume Concentration (PVC) parameter to remain below the Critical Pigment Volume Concentration (CPVC) of the coating system. This ensures that sufficient binder remains to form a continuous film matrix that provides effective oil and grease resistance, while still incorporating enough pigment for coating stability and processing ease
Solution Approach 2:
The patent creates a composite coating system where latex and natural binders work synergistically with pigment materials. The binder system forms a continuous matrix that provides the barrier function, while the pigment provides structural stability and processability, achieving both ease of manufacture and effective performance through proper material composition
4Reliability
If polyethylene extruded coatings are applied as post-processing to impart barrier properties, then oil and grease resistance is improved, but repulpability deteriorates
Solution Approach 1:
The patent employs water-based latex and natural binder materials that are inherently biodegradable and repulpable, replacing non-biodegradable polyethylene extruded coatings. These alternative materials provide the necessary barrier properties during use but can be broken down and recycled with the paper fiber, eliminating the repulpability problem
Solution Approach 2:
The patent formulates the coating with specific binder system compositions and PVC levels that create a film structure providing adequate barrier properties while maintaining compatibility with paper recycling processes, allowing the coating to degrade appropriately during repulping operations
5Ease of manufacture
If conventional paper coating equipment is used to apply barrier coatings, then ease of manufacture is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent adjusts the coating formulation parameters including viscosity, solids content, and pigment-to-binder ratios to be compatible with the operational parameters of conventional paper coating equipment. This allows the coating to be applied uniformly using existing equipment while achieving consistent film quality and performance
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 provides excellent oil and grease resistance, high repulpability, and maintains printability and foldability, while being suitable for conventional coating equipment and minimizing manufacturing waste.
Implementation Method 1
the binder system comprising a latex and a natural binder... providing a continuous three-dimensional film of the binder system
Implementation Method 2
a binder system comprising a latex and a natural binder
Implementation Method 3
exhibit excellent resistance to blocking during manufacture... excellent oil and grease resistance
Data Source
AI summary
Oil and grease resistant paper products include a substrate and, on at least one side of the substrate, a continuous layer of a barrier coating, the barrier coating including a binder system and a pigment. The barrier coating, when applied to the substrate and dried to form a barrier layer, provides a continuous film of the binder system.