Ceramide W/O Emulsion With Silicone Surfactants for Temperature Stability
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Solution Overview
Problem
Existing W/O emulsion compositions containing ceramides face challenges with storage stability under temperature cycles and provide inadequate skin-feeling when applied.
Innovation Solution
A W/O emulsion composition comprising specific combinations of glycerol monofatty acid ester, higher alcohol, ceramide, sphingosine or its salt, and ionic surfactant, along with nonionic surfactants like crosslinked polyether-modified and polyglycerol-modified silicones, enhances stability and skin-feeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ceramides are mixed in an emulsion system, then the skin softness and water-retaining power are improved, but the storage stability under temperature cycles deteriorates due to crystallization
Solution Approach 1:
The patent uses a specific nonionic surfactant (polyglycerol polyricinoleate) as an intermediary substance to mediate between the ceramide and the oil phase. This surfactant prevents ceramide crystallization by forming a stable microemulsion structure, allowing ceramides to remain dispersed without crystallizing during temperature cycles while maintaining emulsion stability.
Solution Approach 2:
The patent changes the HLB value parameter of the emulsion system by selecting a nonionic surfactant with HLB 3-6 (specifically polyglycerol polyricinoleate). This parameter change optimizes the balance between hydrophilic and lipophilic properties, preventing ceramide crystallization while maintaining stable emulsion structure under temperature variations.
2Ease of operation
If conventional surfactants are used in W/O emulsion, then the emulsion can be formed, but the skin-feeling (smoothness and spreadability) is inadequate
Solution Approach 1:
The patent creates a composite emulsion system combining W/O emulsion structure with microemulsion technology. This composite approach integrates the stability of W/O emulsion with the smooth skin-feeling of microemulsions, achieving both emulsion stability and excellent spreadability and smoothness on skin.
3Stability of the object's composition
If O/W/O emulsion is prepared to disperse ceramide, then the mixing stability is improved, but the device complexity and manufacturing process become more complex
Solution Approach 1:
Instead of using the conventional O/W/O emulsion structure, the patent inverts the approach by using a W/O emulsion with a specific nonionic surfactant that has both emulsifying and solubilizing functions. This inversion simplifies the emulsion structure from three phases to two phases while achieving equivalent or better ceramide dispersion stability.
Data Source
AI summary
A W/O emulsion composition having excellent storage stability under temperature cycle conditions is provided. A W/O emulsion composition including the following components (A), (B), (C), (D) and (E): (A) a glycerol monofatty acid ester having 12 to 26 carbon atoms; (B) a higher alcohol having 10 to 22 carbon atoms; (C) a ceramide; (D) one or more selected from the group consisting of sphingosine, a salt thereof and an ionic surfactant; and (E) a nonionic surfactant including the following (e1) and (e2): (e1) one or more selected from the group consisting of a crosslinked polyether-modified silicone and a crosslinked polyglycerol-modified silicone and (e2) one or more selected from the group consisting of a polyether-modified silicone, a polyglycerol-modified silicone and a polyglycerol fatty acid ester.