Poly(ester urea) Microcapsules for Fragrance Stability
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Solution Overview
Problem
The perfumery industry faces challenges in maintaining the stability and olfactory performance of odoriferous compounds due to their volatility, particularly 'top-notes,' which are rapidly lost, and existing microcapsule delivery systems struggle to maintain stability in aggressive surfactant-containing consumer product bases.
Innovation Solution
The development of poly(ester urea) based core-shell microcapsules is achieved by reacting polyisocyanates with polyaminoesters derived from polyols and amino-acids, forming a stable shell around hydrophobic perfume oils, ensuring long-lasting fragrance release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If polyurea or polyurethane-based microcapsules are used for fragrance delivery, then long-lasting olfactory effect is achieved, but stability in aggressive surfactant-containing consumer product bases deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the shell material from conventional polyurea/polyurethane to poly(ester urea) formed by reacting polyisocyanates with polyaminoesters. This compositional parameter change provides both long-lasting olfactory release and enhanced stability in aggressive surfactant-containing consumer product bases, simultaneously resolving the contradiction between duration and reliability
Solution Approach 2:
The invention uses composite shell material poly(ester urea) that combines characteristics of both polyester and polyurea. This composite material integrates the hydrolytic stability of polyester with the cohesive strength and controlled release properties of polyurea, achieving both long-lasting olfactory effect and stability in challenging consumer product formulations
2Quantity of substance
If conventional microcapsule delivery systems are used, then fragrance encapsulation is achieved, but physical dissociation or degradation occurs in challenging bases
Solution Approach 1:
The invention modifies the shell material composition parameters by using poly(ester urea) instead of conventional materials. This compositional change maintains effective fragrance encapsulation while providing resistance to physical dissociation and degradation in aggressive surfactant-containing consumer product bases, simultaneously improving both encapsulation efficiency and compositional stability
3Reliability
If hydrophobic perfume oils are used for fragrance delivery, then olfactive performance is achieved, but volatility loss particularly of top-notes occurs
Solution Approach 1:
The poly(ester urea) shell forms a flexible protective barrier around the hydrophobic perfume oil core. This shell structure controls the release rate of volatile fragrance components, preventing rapid evaporation of top-notes while maintaining effective olfactive performance throughout extended use
Solution Approach 2:
The microcapsule system provides dynamic fragrance release, adjusting the delivery rate of volatile components based on environmental conditions and usage. The poly(ester urea) shell enables sustained release of top-notes and other fragrance components, maintaining olfactive performance over time while minimizing volatility loss
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 poly(ester urea) microcapsules provide enhanced stability and prolonged olfactory performance in challenging consumer product bases, effectively protecting and releasing perfume oils, thereby addressing the volatility and stability issues of traditional microcapsules.
Implementation Method 1
a shell comprising a reaction product between at least one polyisocyanate having at least two isocyanate groups and a polyaminoester
Implementation Method 2
the polyaminoester is obtained by a reaction between a polyol and an amino-acid
Data Source
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AI summary
The present invention relates to a new process for the preparation of poly(ester urea) microcapsules. Poly(ester urea) microcapsules are also an object of the invention. Perfuming compositions and consumer products comprising said microcapsules, in particular perfumed consumer products in the form of home care or personal care products, are also part of the invention.