Aqueous Barrier Coating Composition Stability
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Solution Overview
Problem
Existing gas barrier coatings for flexible packaging applications face incompatibility issues between polyamine adhesion promoters and clay minerals, leading to agglomeration and loss of barrier effect, and often rely on toxic volatile organic solvents for stability.
Innovation Solution
An aqueous composition comprising clay, a vinyl alcohol-based polymer, polyethylene imine, and a polyether siloxane copolymer, which provides storage stability without organic solvents, enhancing workability and machinability while maintaining barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If polyethylene imine is used as adhesion promoter, then adherence to plastic substrate is enhanced, but clay particles agglomerate and precipitate
Solution Approach 1:
The patent introduces a compatibilizer (polymer with both hydrophobic and hydrophilic segments) that acts as an intermediary between the hydrophobic clay particles and the hydrophilic polyethylene imine adhesion promoter. The compatibilizer's hydrophobic segments associate with clay surfaces while its hydrophilic segments remain compatible with the aqueous PEI solution, preventing agglomeration while maintaining adhesion promotion functionality.
2Stability of the object's composition
If isopropyl alcohol is added as co-solvent, then storage stability is achieved, but toxicity increases
Solution Approach 1:
The patent changes the chemical composition parameters of the formulation by replacing toxic organic co-solvents with water-compatible polymers and surfactants. Specifically, it uses polymers with controlled hydrophilicity-hydrophobicity balance and non-ionic surfactants to achieve colloidal stability through steric stabilization and electrostatic repulsion, eliminating the need for volatile organic solvents like isopropyl alcohol.
3Stability of the object's composition
If high amount of organic solvent is used, then composition stability is achieved, but workability and machinability deteriorate
Solution Approach 1:
The patent modifies the formulation parameters by using water as the primary solvent with carefully selected polymer concentrations and molecular weights. The polymer composition is optimized to provide adequate viscosity and stability without excessive organic content, ensuring proper spray characteristics, drying rates, and film formation properties for coating applications.
Data Source
AI summary
The invention relates to an aqueous composition for barrier coating, in particular an aqueous composition for barrier coating comprising a clay, a vinyl alcohol based polymer, a polyethylene imine and a polyether siloxane copolymer, which is stable under storage conditions after being mixed homogeneously.