Coating Composition Stabilizing Solvent System
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Solution Overview
Problem
Existing coating compositions for substrates, such as food and beverage containers, often result in unstable formulations characterized by viscosity increases over time and phase separation, leading to undesirable blistering in the cured coating.
Innovation Solution
The development of coating compositions that include a stabilizing solvent composition comprising a combination of first and second alcohols, a basic water composition, and a crosslinker, which together provide stability and enable the formation of a continuous, non-blistered cured coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional coating compositions are used, then coating application is achieved, but viscosity increases over time and phase separation occurs leading to instability
Solution Approach 1:
The patent introduces a stabilizing solvent composition comprising a specific ratio of low molecular weight alcohol (10-30 wt%) to high molecular weight alcohol (70-90 wt%) as an intermediary substance. This solvent system mediates between the aqueous dispersion and other coating components, preventing phase separation and viscosity increase over time, thereby resolving the instability issue while maintaining coating reliability
Solution Approach 2:
The patent changes the physical-chemical parameters of the solvent system by selecting alcohols with specific carbon chain lengths (C1-C6) and specific molecular weight ranges. The low molecular weight alcohol (1-6 carbon atoms) and high molecular weight alcohol (7-20 carbon atoms) create an optimal solvent environment that maintains composition stability without causing phase separation or viscosity degradation
2Strength
If coating composition is applied and cured, then coating formation is achieved, but blistering occurs in the cured coating
Solution Approach 1:
The stabilizing solvent composition acts as a mediator during the curing process, ensuring uniform distribution of components and preventing trapped solvents or volatiles that would cause blistering. The specific alcohol ratio facilitates proper evaporation and curing dynamics, resulting in continuous, defect-free coatings
Solution Approach 2:
By controlling the molecular weight parameters of the alcohol components (low MW: 1-6 carbons, high MW: 7-20 carbons), the patent optimizes the curing behavior. This parameter control ensures proper solvent evaporation rates and crosslinking dynamics, preventing blister formation while achieving strong, continuous coating formation
3Device complexity
If simple solvent systems are used, then formulation simplicity is maintained, but stability and coating quality are compromised
Solution Approach 1:
The patent creates a composite solvent system combining two distinct alcohol types (low and high molecular weight) in specific ratios. This composite approach provides stability and coating quality benefits that neither component could achieve alone, while maintaining relatively simple formulation and application procedures
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 proposed coating compositions achieve stability and form continuous, non-blistered cured coatings with improved adhesion and impact resistance, making them suitable for various coating applications, including food and beverage containers.
Implementation Method 1
a crosslinker... which together provide stability and enable the formation of a continuous, non-blistered cured coating
Data Source
AI summary
Embodiments of the present disclosure are directed towards coating compositions comprising from 50 to 85 percent of an aqueous dispersion based on a total weight of the coating composition; a stabilizing solvent composition comprising a first alcohol and a second alcohol, wherein each alkyl chain of the first alcohol and the second alcohol is one to three carbon atoms, with the proviso that neither the first alcohol nor the second alcohol is propylene glycol; a basic water composition; and a crosslinker.