Fragrance Microcapsule Shell Chemistry for Color-Stable Storage
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Solution Overview
Problem
Existing microcapsules used in consumer products suffer from instability in coloration during storage, while maintaining stability against leakage and olfactive benefits is crucial.
Innovation Solution
A process involving the use of a cationic core-shell microcapsule with a shell formed by reacting trifunctional araliphatic isocyanate with partially alkylated amino-aldehyde pre-condensate, using a cationic stabilizing polymer and controlled emulsification, to enhance stability and imperviousness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aminoplast resins comprising aromatic polyol or resorcinol are used to form microcapsule shells, then imperviousness to fragrance ingredients is improved, but coloration stability deteriorates (pink to brownish coloration during storage)
Solution Approach 1:
The patent changes the chemical parameters of the shell material by replacing aromatic polyol or resorcinol with araliphatic polyol containing at least one primary hydroxyl group. This parameter change maintains the imperviousness to fragrance ingredients while eliminating the pink to brownish coloration that occurs during storage, thus resolving the contradiction between reliability and composition stability.
Solution Approach 2:
The patent uses a cationic stabilizing polymer in combination with the araliphatic polyol-based aminoplast resin to provide short-term stabilization during storage, preventing coloration without compromising the long-term imperviousness to fragrance ingredients. This allows the microcapsules to maintain their functional properties throughout their intended shelf life.
2Stability of the object's composition
If cationic stabilizing polymer is added to enhance stability, then coloration stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the cationic stabilizing polymer with the aminoplast resin shell formation process, integrating two functional components into a single manufacturing workflow. The stabilizing polymer is incorporated during the microcapsule formation step, eliminating the need for separate stabilization treatment and simplifying the overall manufacturing process while maintaining coloration stability.
3Reliability
If shell imperviousness is enhanced to prevent fragrance leakage, then fragrance stability is improved, but olfactive performance may be compromised
Solution Approach 1:
The patent creates local quality differentiation within the shell structure by using araliphatic polyol with primary hydroxyl groups that provide both imperviousness to prevent fragrance leakage and appropriate permeability to maintain olfactive performance. The specific chemical structure allows the shell to be selectively permeable, blocking unwanted leakage while permitting controlled fragrance release for optimal olfactive effect.
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 microcapsules' stability against coloration and fragrance leakage, maintaining effective olfactive performance.
Implementation Method 1
a shell surrounding the core, wherein the shell comprises a resin formed by reaction of at least one trifunctional araliphatic isocyanate with at least one partially alkylated amino-aldehyde pre-condensate
Implementation Method 2
emulsifying the core composition provided in step a) with the aqueous phase provided in step b) in order to obtain an emulsion of core composition droplets
Data Source
AI summary
The present invention relates to a process for obtaining an encapsulated composition, to an encapsulated composition obtainable by this process, to products comprising these encapsulated compositions and to a use of these encapsulated compositions for obtaining a consumer product.