Cleansing Composition Segmentation for Benefit Agent Deposition
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Solution Overview
Problem
Rinse-off cleansing compositions struggle to effectively deposit surfactant-soluble benefit agents, such as sunscreens and fragrances, due to their solubility in surfactants, leading to poor availability and increased waste of cleansing materials.
Innovation Solution
A cleansing composition with a balanced formulation of 10-30% soap, 20-45% water-soluble organic solvent, 20-40% water, and 3.5-15% electrolyte, along with a benefit agent having a logP value of 0.4-12, which enhances the deposition and availability of surfactant-soluble benefit agents by optimizing the soap and non-soap surfactant ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If surfactant is added to oil-based cleansing compositions to provide detergency properties, then cleansing capability is improved, but deposition of surfactant-soluble benefit agent deteriorates due to solubilization and rinsing away
Solution Approach 1:
The invention divides the surfactant system into two distinct phases: a surfactant-containing continuous phase for cleansing, and a separate oil phase containing the benefit agent. This segmentation prevents the benefit agent from being solubilized by the surfactant while maintaining detergency properties in the continuous phase.
Solution Approach 2:
The invention introduces an oil phase as an intermediary carrier for the surfactant-soluble benefit agent. This oil phase acts as a mediator that protects the benefit agent from direct contact with surfactant molecules, preventing premature solubilization and rinsing away, while still allowing controlled release during use.
2Productivity
If benefit agent is incorporated into rinse-off cleansing compositions, then cleansing function is provided, but availability and deposition of benefit agent deteriorates due to preferential rinsing away
Solution Approach 1:
The invention segments the composition into a surfactant-containing continuous phase and a separate oil phase containing the benefit agent. This segmentation ensures that the benefit agent remains in the oil phase during rinsing, preventing preferential removal while maintaining cleansing function in the continuous phase.
Solution Approach 2:
The invention changes the physical state and solubility parameters of the benefit agent by incorporating it into an oil phase rather than the aqueous continuous phase. This parameter change (from water/surfactant-soluble to oil-soluble) prevents rinsing away while maintaining availability during the cleansing process.
3Reliability
If oil-based compositions are formulated as leave-on products with no or little surfactant, then deposition and retention of benefit agent is improved, but suitability for cleansing purposes deteriorates
Solution Approach 1:
The invention creates a segmented system where cleansing function and benefit agent delivery are separated into different phases. The continuous phase contains surfactant for cleansing, while the dispersed oil phase contains the benefit agent, allowing both functions to coexist without interfering with each other.
Solution Approach 2:
The invention formulates a composite cleansing composition that combines surfactant-containing aqueous phase with oil phase containing benefit agent. This composite structure integrates the cleansing properties of surfactants with the deposition properties of oil-based systems, achieving both functions in a single rinse-off product.
Data Source
AI summary
The present invention provides a cleansing composition comprising 10 to 30 wt% soap, 20 to 45 wt% water soluble organic solvent, 20 to 40 wt% water, 3 to 20 wt% electrolyte other than soap and a benefit agent.