Polyamide Microcapsules for Volatile Perfume Stability
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Solution Overview
Problem
The perfumery industry faces challenges in maintaining the olfactory benefit of odoriferous compounds due to their volatility, particularly 'top-notes,' and there is a need for eco-friendly delivery systems that ensure stability in consumer product bases while providing effective olfactive performance.
Innovation Solution
The development of polyamide-based core-shell microcapsules is achieved by reacting an acyl chloride with an amino-compound in the presence of a carbohydrate, forming a stable oil-in-water emulsion to encapsulate hydrophobic materials like perfumes, which are then cured to create a durable microcapsule slurry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyurea or polyurethane-based microcapsules are used to provide long-lasting olfactory effect and stability, then olfactive performance and stability are improved, but eco-friendliness deteriorates due to use of non-biodegradable materials
Solution Approach 1:
The invention changes the chemical composition parameters of the microcapsule shell by using polyamide formed from acyl chloride and amino compound instead of polyurea or polyurethane. This parameter change maintains the required stability and olfactive performance while improving eco-friendliness through biodegradability of the polyamide material
Solution Approach 2:
The invention uses a composite shell structure comprising polyamide and carbohydrate materials. This composite approach combines the stability-providing polyamide matrix with eco-friendly carbohydrate components (such as starch or cellulose derivatives), achieving both mechanical stability for olfactive performance and improved biodegradability
2Stability of the object's composition
If conventional microcapsule materials are used to ensure stability in challenging bases with aggressive surfactants, then stability is improved, but environmental impact worsens
Solution Approach 1:
The invention modifies the chemical parameters of the shell material by selecting specific polyamide formulations with appropriate molecular weight, crosslinking density, and hydrophobicity. These parameter adjustments enable the microcapsules to resist aggressive surfactants and maintain stability in challenging bases while using environmentally benign materials
Solution Approach 2:
The carbohydrate component acts as an intermediary between the polyamide matrix and the external challenging environment. It provides additional steric protection and hydrophilic character that enhances stability against surfactant attack while maintaining biodegradability and reducing environmental impact
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 maintain stability and olfactive performance in challenging bases, addressing the volatility issue and meeting eco-friendly requirements.
Implementation Method 1
reacting an acyl chloride with at least one amino-compound in the presence of a carbohydrate
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.