Polyamide Microcapsules for Fragrance Stability in Aggressive Bases
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Solution Overview
Problem
The perfumery industry faces challenges in maintaining the stability of microcapsules containing odoriferous compounds in aggressive consumer product bases, leading to rapid loss of olfactive benefit, while there is a growing demand for eco-friendly delivery systems.
Innovation Solution
The development of polyamide core-shell microcapsules formed by reacting acyl chloride with oligopeptide, which are stable in challenging bases and effectively encapsulate hydrophobic materials like perfumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional microcapsules are used in aggressive consumer product bases, then they provide initial olfactive benefit, but they rapidly lose stability and dissociate physically
Solution Approach 1:
The patent uses a composite polyamide shell formed by reacting acyl chloride with oligopeptide to create a stable microcapsule structure that resists dissociation in aggressive bases while maintaining controlled release of fragrance over time
Solution Approach 2:
The patent modifies the chemical composition and crosslinking density of the polyamide shell through controlled reaction parameters, creating a shell with optimized mechanical strength and chemical resistance that maintains stability without compromising fragrance release duration
2Reliability
If traditional polyamide microcapsules are used to ensure stability, then they resist dissociation, but they compromise eco-friendliness
Solution Approach 1:
The patent applies oligopeptide segments specifically at the shell formation stage where they react with acyl chloride to create stable polyamide bonds, while the core fragrance materials remain unchanged, thus achieving stability without compromising the eco-friendly nature of the fragrance components
Solution Approach 2:
The oligopeptide acts as an intermediary between the acyl chloride and the final polyamide structure, enabling the formation of stable eco-friendly polyamide microcapsules through biodegradable peptide-based intermediates that facilitate green synthesis
3Duration of action of stationary object
If microcapsules are designed for controlled release, then they maintain olfactive performance, but they require complex shell structures that reduce manufacturing simplicity
Solution Approach 1:
The patent pre-forms oligopeptide chains before the polyamide shell formation reaction, allowing these structured intermediates to self-assemble into controlled-release shells during the curing step, thus achieving complex release profiles without adding significant manufacturing steps
Solution Approach 2:
The oligopeptide-acyl chloride reaction system self-organizes into polyamide shell structures with inherent controlled-release properties through the curing process, eliminating the need for additional complex structuring steps or external assistance in shell formation
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 polyamide microcapsules provide stability and controlled release of perfumes, maintaining olfactive performance in consumer products without compromising on eco-friendliness.
Implementation Method 1
a polyamide shell comprising the reaction product between at least one acyl chloride and at least one oligopeptide
Data Source
AI summary
Disclosed herein is a new process for the preperation of polyamide microcapsules. Also disclosed herein are the polyamide microcapsules. Also disclosed herein are perfuming compositions and consumer products including the microcapsules, including in the form of home care or personal care products.