Coacervate-Polymer Microcapsules for Surfactant-Stable Perfume Retention
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Solution Overview
Problem
The perfumery industry faces challenges with the rapid loss of olfactive benefit due to volatility of odoriferous compounds and the instability of microcapsules in aggressive surfactant-containing products, leading to leakage and reduced impact.
Innovation Solution
Development of composite microcapsules with a coacervate and polymeric material shell, formed at a specific weight ratio, providing enhanced chemical and mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microcapsules are used to protect odoriferous compounds, then olfactive benefit is improved, but chemical stability deteriorates in aggressive surfactant-containing products
Solution Approach 1:
The patent applies composite materials by combining a coacervate shell (formed from polyelectrolytes) with a polymeric material shell to create a composite microcapsule structure. This composite shell provides both chemical stability in aggressive surfactant-containing products and mechanical stability, resolving the contradiction between protecting odoriferous compounds and maintaining chemical stability.
Solution Approach 2:
The patent utilizes parameter changes by controlling the weight ratio of coacervate material to polymeric material in the composite shell, specifying that the coacervate constitutes 1-50 wt% of the total shell material. This parameter optimization ensures both chemical stability in challenging formulations and effective protection of the encapsulated odoriferous compounds.
2Productivity
If high levels of surfactants are used in cleansers, then cleaning performance is improved, but mechanical stability of microcapsules deteriorates
Solution Approach 1:
The composite shell structure combines coacervate (providing chemical stability) with polymeric material (providing mechanical strength). This composite approach allows the microcapsules to withstand the mechanical stresses imposed by high levels of surfactants in cleansers while maintaining structural integrity and preventing leakage.
Solution Approach 2:
The composite shell structure provides beforehand cushioning by creating a robust protective barrier before the microcapsules are exposed to aggressive surfactant conditions. The combination of coacervate and polymeric material creates a shell that anticipates and resists mechanical degradation, ensuring stability throughout the product lifecycle.
3Productivity
If high levels of surfactants are used, then cleaning effectiveness is improved, but loss of actives deteriorates due to increased diffusion speed
Solution Approach 1:
The composite shell structure with optimized coacervate-to-polymer ratio creates a dual-function barrier: the coacervate component provides chemical stability that prevents degradation, while the polymeric component provides mechanical integrity that reduces diffusion. This composite approach effectively limits the loss of actives even in the presence of high surfactant concentrations.
Solution Approach 2:
By controlling the coacervate content parameter within 1-50 wt% of the total shell material, the patent optimizes the balance between chemical stability and diffusion control. This parameter optimization ensures that actives are protected from excessive diffusion while maintaining cleaning effectiveness.
4Strength
If microcapsules are made more robust for mechanical stability, then structural integrity is improved, but release performance deteriorates
Solution Approach 1:
The composite shell structure applies local quality by having different regions or components serve different functions: the coacervate portion provides chemical stability and protection, while the polymeric material portion provides mechanical strength and controlled release characteristics. This functional differentiation allows simultaneous achievement of structural integrity and reliable release performance.
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 composite microcapsules maintain stability in challenging media, ensuring controlled release and prolonged olfactive performance.
Implementation Method 1
a composite shell comprising a first material and a second material, wherein: the first material and the second material are different, the first material is a coacervate, the second material is a polymeric material
Data Source
AI summary
Described herein is a composite microcapsule slurry including at least one microcapsule having an oil-based core including a hydrophobic material, preferably a perfume, and a composite shell including a first material and a second material. The first material and the second material are different, the first material is a coacervate, the second material is a polymeric material, and the weight ratio in the slurry between the first material and the second material is between 50:50 and 99.9:0.1.