Antiperspirant Emulsion Stick Refractive Index Matching
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Solution Overview
Problem
Antiperspirant emulsion sticks face challenges in achieving consistent refractive index matching between aqueous and oil phases, leading to clarity issues and sensory property compromises due to the variability of raw materials and the use of volatile silicone oils.
Innovation Solution
Incorporating a combination of high and low refractive index non-volatile emollient oils with a liquid fatty alcohol, allowing for predictable refractive index adjustments in the oil phase to match the aqueous phase, while minimizing or eliminating volatile silicone oil, thereby maintaining clarity and sensory feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If volatile silicone oil is used to provide good sensory feel and clean, dry feel, then sensory properties are improved, but refractive index matching becomes difficult and clarity is compromised due to evaporation during production
Solution Approach 1:
The patent replaces volatile silicone oil with non-volatile alternative oils that have different refractive index parameters. By selecting oils with specific refractive indices (matching the aqueous phase), the formulation achieves both clarity through RI matching and sensory properties without the evaporation issue that plagues volatile silicone oils during production
Solution Approach 2:
The patent eliminates volatile silicone oil (a short-lived component that evaporates) and replaces it with stable non-volatile oils that maintain their properties throughout production and storage, thereby solving the refractive index matching problem while preserving sensory benefits
2Ease of manufacture
If liquid fatty alcohol is used to solubilize amido gelator, then solubility is improved, but sensory properties deteriorate due to heavy, oily feel
Solution Approach 1:
The patent uses liquid fatty alcohol specifically for its solubilization function in the manufacturing process, then replaces it with non-volatile oils that provide the desired sensory properties in the final product. This localized application of different materials for different functions resolves the contradiction between solubility and sensory quality
Solution Approach 2:
The patent employs liquid fatty alcohol as an intermediary solubilizing agent during production, which is then superseded by non-volatile oils in the final formulation. The intermediary enables manufacturing feasibility while the final materials deliver sensory excellence
3Manufacturing precision
If refractive index of oil phase is adjusted to match aqueous phase, then clarity is improved, but formulation complexity increases due to trial and error adjustments
Solution Approach 1:
The patent selects non-volatile oils with predetermined refractive indices that are known to match aqueous phases. This preliminary selection of materials with appropriate optical properties eliminates the need for trial-and-error adjustments during formulation, streamlining the development process while ensuring clarity
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 solution enables the production of antiperspirant emulsion sticks with improved clarity and sensory properties by ensuring refractive index matching and reducing volatile oil content, resulting in a more stable and desirable product.
Implementation Method 1
a continuous oil phase comprising one or more gelling agents capable of structuring such phase
Implementation Method 2
Solidifying the emulsion with a structurant that has a very fine and homogeneous microstructure provides a stick in which light scattering is minimized
Data Source
AI summary
The invention relates to a water-in-oil antiperspirant composition comprising: A) an aqueous phase containing dissolved antiperspirant active; B) an oil phase comprising: i) an amido gelator; ii) a fatty alcohol that is liquid at 25° C.; iii) a primary non-volatile emollient oil having a refractive index of from 1.47 to 1.56; iv) a secondary non-volatile emollient oil having a refractive index of from 1.38 to 1.451 and C) and emulsifier; and further to a method of production of said antiperspirant composition.