Polyester Microcapsule Shell Design for Fragrance Stability
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Solution Overview
Problem
The perfume and flavor industry faces challenges with the rapid volatility of active compounds, leading to a short olfactive benefit, and there is a need for eco-friendly delivery systems that maintain stability and performance in consumer products.
Innovation Solution
The development of polyester microcapsules formed through a process involving the reaction between a carboxylic acid derivative and a polyol, which creates a core-shell structure for encapsulating hydrophobic materials, providing protection and controlled release of fragrances or flavors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyurea and polyurethane-based microcapsules are used, then long lasting olfactory effect and stability are provided, but eco-friendliness is compromised
Solution Approach 1:
The patent changes the chemical composition parameters of the microcapsule shell by using polyester polymers instead of polyurea/polyurethane, and by controlling the molecular weight and composition of polyols and carboxylic acid derivatives to achieve both stability and eco-friendliness
Solution Approach 2:
The patent creates composite microcapsule structures combining polyester shell materials with hydrophobic active compounds, using composite polymer systems that integrate both protective and environmentally benign properties
2Object-generated harmful factors
If polyester microcapsules are developed for eco-friendly delivery, then environmental compatibility is improved, but stability in challenging consumer product bases may be compromised
Solution Approach 1:
The patent optimizes parameters including polyester molecular weight (5,000-500,000), polyol-to-derivative ratios, and reaction conditions to achieve sufficient stability while maintaining eco-friendly material composition
Solution Approach 2:
The patent applies different polyester compositions and shell thicknesses to different regions or application requirements, allowing tailored stability performance in specific consumer product environments
3Object-affected harmful factors
If conventional encapsulation methods are used, then protection against oxidation and moisture is provided, but controlled kinetics of flavour or fragrance release is limited
Solution Approach 1:
The patent creates dynamic release systems where the polyester shell gradually degrades or opens under specific triggers (pH, temperature, mechanical stress), enabling controlled kinetics of active compound release over time rather than immediate or passive diffusion
Solution Approach 2:
The patent designs microcapsules that release active compounds in periodic or sequential patterns, providing sustained olfactory or flavour effects through controlled intermittent release rather than continuous diffusion
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 polyester microcapsules offer enhanced stability and controlled release of perfumes or flavors, maintaining performance while being eco-friendly, thus addressing the volatility and stability issues in consumer products.
Implementation Method 1
applying conditions sufficient to induce interfacial polymerization and form polyester microcapsules in the form of a slurry
Data Source
AI summary
The present invention relates to a new process for the preparation of polyester microcapsules. Microcapsules are also an object of the invention. Consumer products comprising said microcapsules, in particular perfumed consumer products or flavoured consumer products are also part of the invention.