Core-Shell Microcapsule Hydrated Polymer Interface
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Solution Overview
Problem
Existing encapsulated compositions for consumer products face challenges in achieving high deposition and adherence on substrates, particularly fabrics, while maintaining sustainability and biodegradability, and ensuring controlled release of benefit agents.
Innovation Solution
The development of a core-shell microcapsule composition with a hydrated polymer phase and a polymeric stabilizer at the interface, where the polymeric stabilizer is highly cross-linked to prevent benefit agent leakage and the hydrated polymer phase enhances deposition and microbial degradation, using materials like aminosilanes and isocyanates for shell formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pectin-based polymeric stabilizer and hydroxyethylcellulose are used to create bio-sourced microcapsules, then sustainability and biodegradability are improved, but deposition and adherence on fabrics deteriorates
Solution Approach 1:
The patent uses a composite shell structure combining a polymeric stabilizer (for imperviousness and sustainability) with a hydrated polymer phase (for deposition and adherence). This composite approach allows both sustainability and improved fabric adherence to be achieved simultaneously, resolving the contradiction between using bio-sourced materials and achieving good deposition.
2Reliability
If the polymeric stabilizer is highly cross-linked to prevent benefit agent leakage, then encapsulation reliability is improved, but shell permeability deteriorates
Solution Approach 1:
The patent modifies the cross-linking degree of the polymeric stabilizer to optimize the balance between encapsulation stability and controlled release. By adjusting cross-linking parameters, the shell becomes sufficiently impervious to prevent leakage while maintaining the ability to release benefit agents under specific conditions, resolving the contradiction between stability and controlled permeability.
3Reliability
If natural materials are used to enhance biodegradability, then environmental sustainability is improved, but deposition performance deteriorates
Solution Approach 1:
The patent applies different material properties to different parts of the microcapsule structure. The polymeric stabilizer provides sustainability and biodegradability, while the hydrated polymer phase specifically enhances deposition performance. This local differentiation of material qualities allows both biodegradability and good deposition to coexist.
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 significantly improves the deposition and adherence of microcapsules on substrates, maintains high biodegradability, and ensures controlled release of benefit agents, with reduced leakage and enhanced sustainability.
Implementation Method 1
the polymeric stabilizer is highly cross-linked to decrease significantly the diffusion of the encapsulated benefit agent through the shell
Implementation Method 2
the hydrated polymer phase provides the desired deposition and adherence to the substrate
Implementation Method 3
the polymeric stabilizer provides an impervious encapsulating material, whereas the hydrated polymer phase provides the desired deposition and adherence
Data Source
AI summary
Described is an encapsulated composition comprising at least one core-shell microcapsule. The at least one core-shell microcapsule comprises a core comprising at least one benefit agent and a shell surrounding the core. The shell comprises a hydrated polymer phase and a polymeric stabilizer at an interface between the shell and the core. Disclosed are also a method for preparing such an encapsulated composition and a use of such a composition to enhance the performance of a benefit agent in a consumer product.