Microcapsule Shell Stability Using Amino-Acid Polyisocyanates
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Solution Overview
Problem
The perfumery industry faces challenges in maintaining the stability of microcapsules in challenging consumer product bases, such as those containing aggressive surfactants, which leads to rapid loss of olfactive benefits due to the volatility of odoriferous compounds, particularly 'top-notes', necessitating improved delivery systems for sustained fragrance release.
Innovation Solution
A process for preparing core-shell microcapsules with an oil-based core and a shell comprising polymerized amino-acid derived polyisocyanate having at least two isocyanate functional groups, specifically using lysine diisocyanate or other triisocyanates, to enhance stability and controlled release of perfume oils in consumer products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional microcapsule delivery systems are used, then fragrance release is provided, but stability in challenging bases containing aggressive surfactants deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the shell material by using polymerized amino-acid derived polyisocyanates with specific molecular structures (lysine diisocyanate, arginine triisocyanate, etc.). These parameter changes in the shell material provide enhanced resistance to aggressive surfactants while maintaining fragrance delivery performance
Solution Approach 2:
The invention employs composite material structure with an oil-based core containing perfume and a polymerized polyisocyanate shell. This composite design combines the fragrance delivery function of the oil core with the protective and stabilizing properties of the amino-acid derived polyisocyanate shell, resolving the contradiction between fragrance release and stability in challenging bases
2Quantity of substance
If volatile odoriferous compounds are used for fragrance, then olfactive benefit is provided, but loss of fragrance due to volatility increases
Solution Approach 1:
The invention applies preliminary action by pre-encapsulating volatile fragrance compounds in microcapsules with polymerized polyisocyanate shells before exposure to the challenging base. This preliminary encapsulation protects the volatile compounds from premature loss and enables controlled release, resolving the contradiction between providing olfactive benefit and preventing fragrance loss
Solution Approach 2:
The invention uses flexible shell structures made of polymerized amino-acid derived polyisocyanates that can adapt to the fragrance core while providing protective enclosure. These thin film shells allow controlled fragrance release while preventing excessive volatility loss, addressing the contradiction between olfactive benefit and fragrance retention
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 microcapsules demonstrate improved stability and sustained olfactive performance in challenging bases, effectively counteracting extraction by surfactants and maintaining fragrance release over time.
Implementation Method 1
a shell comprising a polymerized amino-acid derived polyisocyanate having at least two isocyanate functional groups
Implementation Method 2
preparing a dispersing phase comprising a stabilizer, wherein the dispersing phase is not miscible with the oil phase; adding the oil phase into the dispersing phase to form a two-phases dispersion
Data Source
Figure 1
AI summary
The present invention relates to a new process for the preparation of a microcapsule slurry. A microcapsule slurry is also an object of the invention. Perfuming compositions and consumer products comprising said microcapsule slurry, in particular perfumed consumer products in the form of home care or personal care products, are also part of the invention.