W/O Emulsion Composition With Starch for Phase Stability
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Solution Overview
Problem
Conventional water-in-oil emulsions face issues of instability, particularly when incorporating microparticulate raw materials, leading to oil separation and phase separation, and are often characterized by an oily residue and limited stability, which complicates the incorporation of polar lipophilic substances like UV filters.
Innovation Solution
The use of Cetyl diglyceryl tris-(trimethylsiloxy)silylethyldimethicone as an emulsifier in combination with particulate and/or non-water-swellable starches, such as tapioca starch, stabilizes the emulsion, allowing for the incorporation of microparticulate additives and maintaining sensory appeal while being PEG-free.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional water-in-oil emulsifiers (PEG/PPG-containing) are used, then good emulsification is achieved, but the formulation becomes PEG-dependent with limited emulsifier selection
Solution Approach 1:
The patent changes the chemical parameters of the emulsifier by selecting a specific silicone-based emulsifier (cetyl diglyceryl tris(trimethylsiloxy)silyl ethyl dimethicone) that is PEG-free, thereby expanding the range of acceptable emulsifiers while maintaining emulsion stability through its unique molecular structure and properties
2Ease of operation
If microparticulate powder raw materials are incorporated into W/O emulsions, then sensory properties are enhanced, but physical stability deteriorates due to oil separation and phase separation
Solution Approach 1:
The patent uses a specific silicone-based emulsifier as an intermediary substance that mediates between the microparticulate powder raw materials and the oil phase, allowing the powders to be incorporated without causing instability while maintaining enhanced sensory properties
Solution Approach 2:
The patent creates a composite emulsion system that combines the silicone-based emulsifier with microparticulate powder raw materials in the oil phase, forming a stable composite structure that prevents separation while maintaining sensory benefits
3Reliability
If high concentrations of silicone emulsifiers are used, then emulsion stability is improved, but the formulation complexity and cost increase
Solution Approach 1:
The patent optimizes the concentration parameter of the silicone-based emulsifier to achieve effective stabilization at moderate levels, avoiding the need for high concentrations while maintaining stability through the emulsifier's efficient molecular structure
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 emulsions exhibit improved stability, better sensory properties, enhanced skin care effects, and suitability as vehicles for cosmetic and dermatological active ingredients, with better absorption and biocompatibility, while enabling the production of stable, low-viscosity formulations.
Implementation Method 1
The present invention relates to a cosmetic preparation in the form of water-in-oil emulsions based on cetyl diglyceryl tris-(trimethylsiloxy)silylethyldimethicone as an emulsifier
Implementation Method 2
Cetyl diglyceryl tris-(trimethylsiloxy)silylethyldimethicone as an emulsifier
Implementation Method 3
They should nourish the skin, particularly by providing long-lasting hydration. This is generally achieved through moisturizers that bind water in the stratum corneum
Implementation Method 4
Additionally, added lipids keep the upper skin layers supple and reduce transepidermal water loss
Data Source
AI summary
Discloses are cosmetic or dermatological water-in-oil emulsions which contain A) cetyl diglyceryl tris(trimethylsiloxy)silyl ethyl dimethicones as emulsifier, B) an oil phase, C) an aqueous phase, and are characterized by a moiety of one or more particulate and/or non-water-swellable starches and/or starch derivatives.