Polyamide Microcapsules for Surfactant Stability
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Solution Overview
Problem
The perfumery industry faces challenges in maintaining the olfactory benefits of odoriferous compounds due to their volatility, particularly 'top-notes,' and requires delivery systems that ensure stability in aggressive surfactant-containing bases without degrading, while also seeking eco-friendly solutions that maintain performance.
Innovation Solution
The development of polyamide-based core-shell microcapsules is achieved by reacting functionalized carbohydrates with amino-compounds, forming a stable shell around a hydrophobic core, such as perfumes, to create a durable and eco-friendly delivery system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyurea and polyurethane-based microcapsules are used, then stability and olfactive performance are improved, but eco-friendliness deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the microcapsule shell by using polyamide formed from amino-compounds and acyl chlorides, replacing traditional polyurea/polyurethane materials. This parameter change maintains the required stability and olfactive performance while improving eco-friendliness by eliminating harmful substances.
Solution Approach 2:
The invention employs a composite shell structure made from the reaction product of amino-compounds and acyl chlorides, creating a polyamide-based material that combines the beneficial properties of both components: the stability and adhesion from the amino-compound and the structural integrity from the acyl chloride, achieving both performance and environmental sustainability.
2Reliability
If conventional delivery systems are used, then olfactive performance is maintained, but stability in aggressive surfactant-containing bases deteriorates
Solution Approach 1:
The invention modifies the chemical parameters of the microcapsule shell by introducing polyamide structure with specific functional groups that provide resistance to surfactant degradation, while maintaining the encapsulation efficiency and controlled release properties necessary for olfactive performance.
Solution Approach 2:
The invention applies different functional characteristics to different parts of the microcapsule system: the shell is designed with surfactant-resistant polyamide structure to withstand aggressive bases, while the core maintains the perfume composition for olfactive performance, achieving local optimization of properties.
3Object-affected harmful factors
If polyamide-based microcapsules are prepared using the new process, then eco-friendliness and stability are improved, but manufacturing complexity increases
Solution Approach 1:
The invention combines multiple steps into an integrated process: the amino-compound and acyl chloride are introduced into the emulsion system and react in situ to form the polyamide shell during microcapsule formation, merging the shell formation and polymerization steps into a single operation, thereby reducing overall manufacturing complexity despite the advanced chemistry involved.
Solution Approach 2:
The invention uses the emulsion system as an intermediary medium that facilitates the reaction between amino-compounds and acyl chlorides, allowing the polyamide shell to form in a controlled aqueous environment rather than requiring separate organic synthesis steps, thereby simplifying the manufacturing process while maintaining eco-friendliness.
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
This process results in microcapsules that provide long-lasting olfactory performance and stability in challenging bases, meeting both stability and eco-friendliness criteria, effectively addressing the industry's needs for controlled release and environmental sustainability.
Implementation Method 1
reacting a functionalized carbohydrate with at least one amino-compound
Implementation Method 2
Dispersing the oil phase obtained in step a) into a water phase to form an oil-in water emulsion
Data Source
AI summary
Disclosed herein is a process for the preparation of polyamide-based microcapsules. Also disclosed herein are polyamide-based microcapsules. Also disclosed herein are perfuming compositions and consumer products including the microcapsules, in particular perfumed consumer products in the form of home care or personal care products.