Oil-in-Water Emulsion Composition for Matte, Easy-Spreading Sunscreen
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Solution Overview
Problem
Existing cosmetic and dermocosmetic formulations, particularly oil-in-water emulsions, face challenges in providing improved sensory and aesthetic properties such as ease of application, matte appearance, and reduced lipid residue, while meeting environmental sustainability and regulatory requirements, often relying on silicone derivatives that are not environmentally friendly.
Innovation Solution
Development of an oil-in-water emulsion using a mixture of linear and branched alkanes and cycloalkanes, marketed as Emogreen ™< L15 and Emosmart ™< L19, to enhance spreading properties and aesthetic characteristics without using silicone derivatives, ensuring biodegradability and compliance with environmental regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If surfactant or polymeric emulsifying agents are used to maintain the stability of oil-in-water emulsion, then the emulsion stability is improved, but the sensory properties deteriorate by giving the emulsion a heavy feel during application
Solution Approach 1:
The patent changes the chemical composition parameters of the emulsion by replacing traditional surfactants with a specific mixture of linear alkanes (C15-C17), branched alkanes, and cycloalkanes. This parameter change maintains emulsion stability while improving spreading properties and eliminating the heavy feel on skin application.
Solution Approach 2:
The patent uses a composite mixture of different hydrocarbon types (linear alkanes, branched alkanes, and cycloalkanes) as the oily phase. This composite material approach provides both emulsion stability and improved sensory properties, resolving the contradiction between stability and ease of application.
2Stability of the object's composition
If silicone elastomers are used to stabilize water-in-oil emulsion, then the emulsion stability is improved, but the sensory properties deteriorate and solubility of sunscreens is altered causing precipitation
Solution Approach 1:
The patent extracts and removes silicone elastomers from the formulation entirely, replacing them with a hydrocarbon-based oily phase consisting of linear alkanes, branched alkanes, and cycloalkanes. This elimination prevents both the sensory discomfort and the solubility issues with sunscreen filters that occur with silicone elastomers.
Solution Approach 2:
The patent replaces expensive silicone elastomers with more economical hydrocarbon mixtures that achieve the same stabilizing function without the harmful side effects, providing a cost-effective solution that avoids precipitation and sensory issues.
3Reliability
If protective formulations are designed for effectiveness against UV radiation and inflammation, then the protective performance is improved, but the sensory properties deteriorate with greasy sensations and prolonged application time
Solution Approach 1:
The patent changes the rheological parameters of the formulation by using a specific ratio of linear to branched alkanes combined with cycloalkanes, creating a lighter texture that spreads easily while maintaining the protective performance against UV radiation and inflammation.
4Ease of operation
If formulations are designed to provide rich consistency for skin comfort, then the sensory properties are improved, but the application time increases and spreading resistance increases
Solution Approach 1:
The patent optimizes the molecular weight and chain length parameters of the alkane components (C15-C17 linear, C16-C20 branched) to achieve a balance where the emulsion provides rich skin comfort sensation while maintaining low viscosity for quick spreading and reduced application time.
Data Source
AI summary
The invention relates to a method for improving the sensorial and/or aesthetic properties of an oil-in-water type emulsion for topical application (E0), characterised in that it includes an effective quantity of a mixture (M1) of saturated cyclic or acyclic, linear or branched hydrocarbons of which at least 95% by weight have between fifteen and nineteen carbon atoms; the invention also relates to a new sun-cream emulsion and the use of same to protect the skin.