Core-Shell Microcapsule Shell with Hyperbranched Polysaccharide
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Solution Overview
Problem
Existing microcapsules used for delivering functional materials on keratinous surfaces, such as skin and hair, suffer from inadequate deposition and rinse resistance, particularly in rinse-off products, leading to inefficiencies and potential loss of benefits due to dilution and washing.
Innovation Solution
Incorporation of hyperbranched polysaccharides, such as amylopectin, dextrins, and glycogen, into the shell of core-shell microcapsules to enhance deposition and rinse resistance, achieved by embedding or attaching these polymers during the microcapsule formation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional microcapsules are used for delivering functional materials on keratinous surfaces, then the microcapsules can be dispersed in aqueous media, but the deposition and rinse resistance on keratinous surfaces are insufficient
Solution Approach 1:
The patent applies composite materials by combining conventional microcapsule shells with hyperbranched polysaccharides. The hyperbranched polysaccharide-modified microcapsule shell comprises both the original shell material (such as polyacrylate, polyurethane, or aminoplast resin) and the hyperbranched polysaccharide component, creating a composite structure that leverages the deposition properties of the polysaccharide while maintaining the encapsulation functionality of the microcapsule.
Solution Approach 2:
The patent modifies the chemical and physical parameters of the microcapsule shell by incorporating hyperbranched polysaccharides with specific molecular weights (10,000 to 1,000,000 g/mol) and branching degrees (10% to 90%). This parameter modification enables the shell to achieve improved adhesion to keratinous surfaces and enhanced rinse resistance while maintaining dispersibility in aqueous media.
2Reliability
If large volumes of rinse water are used, then thorough cleaning is achieved, but the microcapsules are washed off the surface
Solution Approach 1:
The patent applies preliminary action by modifying the microcapsule shell properties before the rinsing process occurs. The hyperbranched polysaccharide is incorporated into the shell during manufacturing, creating pre-conditioned adhesion properties that enable the microcapsules to withstand subsequent rinsing with large volumes of water without being washed off.
Solution Approach 2:
The hyperbranched polysaccharide acts as an intermediary substance between the microcapsule shell and the keratinous surface. It provides a chemical bridge that enhances adhesion, allowing the microcapsules to remain attached to the surface even when exposed to large volumes of rinse water that would otherwise wash them off.
3Reliability
If microcapsules are coated with anionic surfactant and cationic polymer is added, then deposition aid is provided, but electrostatically induced incompatibility issues occur
Solution Approach 1:
The patent extracts and eliminates the problematic cationic polymer deposition aid from the formulation. Instead of using a complex system involving anionic surfactant coating followed by cationic polymer addition, the invention directly incorporates hyperbranched polysaccharides into the microcapsule shell, which provides deposition enhancement without introducing electrostatic incompatibility issues.
Solution Approach 2:
The patent replaces the complex, multi-component deposition system (anionic surfactant plus cationic polymer) with a simpler, single-component approach using hyperbranched polysaccharide-modified microcapsules. This simplification reduces formulation complexity and eliminates the need for careful control of electrostatic interactions between multiple charged components.
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 use of hyperbranched polysaccharides significantly improves the deposition and rinse resistance of microcapsules on keratinous surfaces, ensuring better retention and release of functional materials even under rinsing conditions.
Implementation Method 1
embedding and/or attaching a hyperbranched polysaccharide into and/or onto core-shell microcapsules
Implementation Method 2
improves the deposition and rinse resistance of microcapsules on keratinous surfaces
Data Source
AI summary
Disclosed is a composition comprising at least one core-shell microcapsule in a suspending medium. The microcapsule comprises a core and a shell around said core. The shell comprises a hyperbranched polysaccharide selected from the group consisting of amylopectins, dextrins, hyperbranched starches, glycogen and phytoglycogen and mixtures thereof.