Coated Microcapsules with Metallic Shell for Controlled Release
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Solution Overview
Problem
Existing microcapsules face limitations such as permeability issues in products with high surfactant, solvent, or water content, limited active encapsulation breadth, instability during product incorporation, and inadequate deposition on treatment sites, necessitating improved microcapsules with enhanced stability and controlled release.
Innovation Solution
Development of coated microcapsules with a polymeric shell and a metallic coating comprising particles of one metal adsorbed on the shell and a film of another metal, providing improved stability and controlled release characteristics, specifically designed to retain over 50% of the liquid core material during the Ethanol Stability Test.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microcapsules are made highly stable to prevent premature release, then they do not release the active in use, but if they are made less stable to enable release, then they cannot withstand the processes required to incorporate them and make consumer products
Solution Approach 1:
The shell is segmented into multiple functional layers: an inner polymeric shell providing mechanical strength and encapsulation, and an outer metal coating layer (comprising metal particles and metal film) providing controlled permeability. This segmentation allows each layer to specialize - the polymeric core withstands processing while the metal outer layer controls release behavior.
Solution Approach 2:
The microcapsule employs a composite shell structure combining polymeric material with metal coating (metal particles embedded in metal film). This composite structure integrates the mechanical robustness of polymers with the selective permeability and stability of metals, achieving both processability and controlled release.
2Reliability
If microcapsules are made permeable to allow active release, then they release the active prematurely in products with high surfactant, solvent, and water content, but if they are made impermeable to prevent premature release, then they cannot effectively deliver the active
Solution Approach 1:
The shell exhibits local quality differences through its layered structure: the inner polymeric region provides mechanical integrity while the outer metal coating region provides selective permeability. The metal particles and film create localized pathways that allow controlled diffusion of active ingredients while blocking harmful interactions with surfactants and solvents.
Solution Approach 2:
The metal coating acts as an intermediary barrier between the liquid core material and the external product environment. This intermediate layer mediates the interaction by allowing selective passage of active ingredients while preventing premature release and blocking harmful substances from reaching the core.
3Adaptability or versatility
If microcapsules are designed for broad active encapsulation, then they cannot be formulated in certain product classes due to strict formulation limits, but if they are designed for specific actives, then they have limited encapsulation breadth
Solution Approach 1:
The dual-layer shell structure serves multiple functions simultaneously: mechanical protection, selective permeability, and chemical stability. This multi-functional design makes the microcapsules universally applicable across different product types (personal care, household cleaners, industrial applications) while maintaining formulation compatibility through the stable metal outer layer that resists interactions with various chemicals.
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 coated microcapsules demonstrate enhanced stability and controlled release, effectively addressing permeability and deposition issues, ensuring the liquid core material is retained and released as needed, improving the performance of consumer products.
Implementation Method 1
the metallic coating comprises particles of a first metal adsorbed on said polymeric shell
Implementation Method 2
a film of a second metal formed thereon
Data Source
Figure 1a~2a
Figure 2b~2c
Figure 3a~3b
AI summary
Consumer products including compositions that include coated microcapsules, said coated microcapsules including a polymeric shell and a liquid core material encapsulated therein; and a metallic coating surrounding said microcapsules and methods related thereto.