Core-Shell Coating Composition for Barrier and Grease Resistance
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Solution Overview
Problem
Current polymeric coating compositions lack improved barrier properties such as water uptake, water vapor transmission, and oxygen transmission rates while maintaining oil and grease resistance.
Innovation Solution
A coating composition comprising a dispersion with a core of base polymer, a shell of polar polymeric stabilizing agent, and hydrophobic particulate fillers embedded in the shell, formed through melt-blending and kneading with water, applied to a substrate to enhance barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric coating compositions are used to provide barrier properties, then water vapor transmission and oxygen transmission rates are reduced, but oil and grease resistance properties deteriorate
Solution Approach 1:
The coating composition employs a core-shell structure where the core contains polymeric material for barrier properties and the shell contains hydrophobic particulate fillers for oil and grease resistance. This local differentiation of material properties at different spatial locations (core vs. shell) allows simultaneous achievement of water vapor barrier and oil/grease repellency without compromise
Solution Approach 2:
The invention creates a composite coating system combining polymeric material with hydrophobic particulate fillers in a core-shell architecture. This composite structure integrates the barrier properties of the polymer with the hydrophobic surface characteristics of the particulate fillers, resolving the contradiction between water vapor transmission reduction and oil/grease resistance maintenance
2Strength
If polymeric coating compositions are applied to substrates, then structural integrity and strength are improved, but water uptake properties worsen
Solution Approach 1:
The core-shell structure places hydrophobic particulate fillers specifically in the shell layer that contacts the environment, creating a local hydrophobic barrier that prevents water uptake while the core polymer provides structural integrity. This spatial separation of functions resolves the contradiction between strength enhancement and water resistance
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 composition achieves improved barrier properties, including reduced water vapor transmission and oxygen transmission rates, while maintaining oil and grease resistance, making it suitable for applications like food packaging.
Implementation Method 1
said shell comprising a polar polymeric stabilizing agent
Implementation Method 2
one or more hydrophobic particulate fillers embedded at least partially in said shell
Implementation Method 3
reduced water vapor transmission
Implementation Method 4
reduced oxygen transmission rates
Implementation Method 5
maintaining oil and grease resistance
Data Source
AI summary
A coating composition which comprises a dispersion comprising: (a) a core comprising a base polymer; (b) a shell at least partially surrounding said core, wherein said shell comprising a polar polymeric stabilizing agent; and (c) one or more hydrophobic particulate fillers embedded at least partially in said shell is provided.