Rinse-off Cleansing Perfume Microemulsion Phase Segmentation
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Solution Overview
Problem
Current skin cleansers fail to effectively deliver perfume scent during use and retain residual scent on the skin due to perfume solubilization in surfactant micelles, leading to inefficient perfume delivery and short-lasting fragrance.
Innovation Solution
The development of a rinse-off cleansing composition that forms a perfume microemulsion phase during use, with a sufficient amount of hydric solvent and surfactant, allowing perfume to exist in the central core region and not proximal to surfactant hydrocarbons, thereby increasing perfume activity coefficients and enhancing bloom and retention on the skin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If perfume is solubilized in surfactant micelles, then the composition can maintain stability, but perfume activity coefficients decrease leading to reduced bloom and short-lasting fragrance
Solution Approach 1:
The invention segments the perfume distribution by creating a distinct microemulsion phase separate from the surfactant micelle phase. This segmentation allows perfume to concentrate in the microemulsion core region rather than being dispersed throughout the surfactant micelles, thereby maintaining composition stability while significantly enhancing perfume activity coefficients and bloom characteristics
Solution Approach 2:
The invention introduces a microemulsion phase as an intermediary structure that mediates between the surfactant system and perfume molecules. This intermediary phase provides a dedicated environment for perfume solubilization with high activity coefficients, resolving the conflict between composition stability and perfume delivery efficiency
2Reliability
If perfume concentration is increased to enhance scent delivery, then initial perfume perception improves, but composition stability deteriorates due to micelle saturation
Solution Approach 1:
By segmenting the perfume accommodation into a dedicated microemulsion phase, the system can accommodate high perfume concentrations without saturating the surfactant micelles. This segmentation maintains composition stability even at elevated perfume levels while enhancing initial perfume perception and scent delivery
Solution Approach 2:
The invention changes the physical-chemical parameters of the system by forming a microemulsion phase with distinct properties from surfactant micelles. This parameter change enables high perfume loading with maintained stability, as the microemulsion phase provides a different solubilization environment that does not saturate at the same concentrations as micelles
3Reliability
If perfume is applied after cleansing, then residual scent on skin is achieved, but the expensive perfume ingredient is wasted due to lack of delivery during cleansing
Solution Approach 1:
The invention performs preliminary perfume delivery during the cleansing process itself, rather than requiring post-cleansing application. The microemulsion phase ensures perfume is effectively delivered to the skin during rinsing, achieving both initial perception and residual scent while preventing waste of the expensive perfume ingredient
Solution Approach 2:
The invention creates continuity of useful perfume action from cleansing through to post-cleansing. The perfume delivered during the rinse-off phase provides continuous scent coverage, eliminating the gap between cleansing and subsequent perfume application, thereby maximizing the utility of each perfume molecule
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 composition achieves significantly enhanced initial perfume perception and prolonged scent retention on the skin, with perfume bloom and relative bloom often doubled or tripled, and scent longevity extended for several hours after cleansing.
Implementation Method 1
The development of a rinse-off cleansing composition that forms a perfume microemulsion phase during use
Data Source
AI summary
Rinse-off cleansing compositions can include surfactant, perfume, solvent, and water, wherein the rinse-off cleansing composition has a G′ of at least about 25 Pa and/or is not a ringing gel.