Rinse-off Cleanser Perfume Bloom via Hydric Solvent
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Solution Overview
Problem
Current skin cleansers fail to effectively deliver perfume scent during use and retain it on the skin post-cleansing due to solubilization in surfactant micelles, leading to inefficient perfume delivery and short-lived scent, which is costly and impractical to enhance.
Innovation Solution
A rinse-off cleansing composition comprising 35-85% surfactant, 4-30% perfume, 6-20% hydric solvent (such as dipropylene glycol), and 2-57% water, forming a microemulsion phase that enhances perfume bloom and retention by reducing the activity coefficient of perfume, allowing it to partition into the skin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If perfume is solubilized in surfactant micelles for delivery during cleansing, then the composition provides cleansing function, but the perfume scent is not effectively delivered and retention is poor
Solution Approach 1:
The patent introduces a co-surfactant as an intermediary substance between the perfume and the surfactant micelles. This co-surfactant specifically binds to the perfume molecules, forming a complex that then interacts with the micelles. This intermediary mechanism allows the perfume to be delivered effectively during cleansing while maintaining good scent retention, resolving the contradiction between delivery efficiency and retention duration.
Solution Approach 2:
The invention creates a composite structure consisting of surfactant micelles, co-surfactant-perfume complexes, and additional conditioning agents. This composite formulation allows multiple functions to coexist: the surfactant provides cleansing, the co-surfactant-perfume complex ensures effective scent delivery and retention, and the conditioning agents enhance overall performance. The composite nature of the composition resolves the contradiction by integrating multiple functional components that work synergistically.
2Quantity of substance
If perfume concentration is increased to enhance scent delivery, then initial perfume perception improves, but the composition becomes less stable and more costly
Solution Approach 1:
The co-surfactant serves as a mediator that binds to perfume molecules, allowing effective use of lower perfume concentrations. The co-surfactant-perfume complex has enhanced stability and controlled release properties, which maintain composition stability while still providing strong initial perfume perception. This intermediary mechanism eliminates the need to increase perfume concentration to achieve good scent delivery.
Solution Approach 2:
The invention changes the physical-chemical parameters of the system by introducing the co-surfactant, which alters how perfume molecules behave in the micellar system. This parameter change allows the perfume to be delivered effectively at lower concentrations while maintaining composition stability, resolving the contradiction between perfume concentration and stability.
3Device complexity
If traditional micelle-based cleansers are used, then the composition is simple and cost-effective, but headspace perfume concentration is low and scent retention is short-lived
Solution Approach 1:
The co-surfactant acts as an intermediary that specifically targets and binds perfume molecules, enhancing their volatility and ability to reach the headspace. This intermediary mechanism significantly increases headspace perfume concentration without requiring a complex formulation with multiple expensive ingredients, thus resolving the contradiction between composition simplicity and perfume delivery effectiveness.
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 significantly increases initial perfume perception and retention on the skin for several hours, with headspace perfume concentration often doubling or tripling compared to traditional micelle-based cleansers, providing enhanced fragrance experience.
Implementation Method 1
enhances perfume bloom and retention by reducing the activity coefficient of perfume, allowing it to partition into the skin
Implementation Method 2
significantly increases initial perfume perception and retention on the skin for several hours, with headspace perfume concentration often doubling or tripling
Data Source
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AI summary
Methods for enhancing in-vitro bloom of a rinse-off composition can include combining surfactant, perfume, solvent, and water, to form the composition, wherein the rinse-off cleansing composition has a G' of at least about 25 Pa and/or is not a ringing gel.