Crosslinked Polysiloxane Emulsifiers for High Silicone Oil Stability
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Solution Overview
Problem
Conventional water-in-oil emulsifiers, such as ABIL ®< EM 90, are not stable in formulations with high fractions of silicone oil (> 15% by weight), particularly at elevated temperatures, requiring additional coemulsifiers or formulations with lower silicone oil content to maintain stability, and struggle with crystalline constituents.
Innovation Solution
Crosslinked organopolysiloxanes linked by alkyl polyether building blocks are used to create emulsifier systems that provide stable water-in-oil emulsions even with high silicone oil content, offering higher viscosity and long-term stability, and effectively prevent crystallization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional water-in-oil emulsifiers (e.g., ABIL ® EM 90) are used in formulations with high silicone oil content (>15% by weight), then the formulation can accommodate high silicone oil fractions, but the emulsion stability deteriorates, especially at elevated temperatures
Solution Approach 1:
The invention changes the chemical parameters of the emulsifier by introducing crosslinked organopolysiloxanes with specific polyether building blocks (EO, PO, XO units) and controlling the molar ratios of these units. This parameter modification enables the emulsifier to maintain stability in high silicone oil content formulations (>15%) even at elevated temperatures, resolving the contradiction between high silicone oil content and emulsion stability
Solution Approach 2:
The invention creates a composite emulsifier system combining crosslinked organopolysiloxane backbone with polyether building blocks containing ethylene oxide (EO), propylene oxide (PO), and/or 1,3-propanediol oxide (XO) units. This composite structure provides both the silicone oil compatibility and the thermal stability needed to maintain emulsion integrity in high silicone oil formulations
2Quantity of substance
If conventional emulsifiers are used to prepare water-in-oil emulsions, then the emulsifier concentration can be kept low, but the long-term stability of the emulsion deteriorates
Solution Approach 1:
The invention modifies the molecular parameters of the emulsifier by creating crosslinked organopolysiloxanes with controlled polyether chain lengths and compositions (EO:PO:XO ratios). These parameter changes enable the emulsifier to provide long-term stability (several months) even at low concentrations (<1% by weight), resolving the contradiction between low emulsifier concentration and long-term stability duration
3Stability of the object's composition
If emulsifier systems are designed for high stability, then the emulsion stability improves, but the device complexity increases due to requiring multiple coemulsifiers
Solution Approach 1:
The invention creates a universal emulsifier (crosslinked organopolysiloxane with polyether building blocks) that performs multiple functions simultaneously: it stabilizes water-in-oil emulsions, maintains stability at elevated temperatures, works with high silicone oil content, and prevents crystallization. This single multi-functional emulsifier replaces complex systems requiring multiple coemulsifiers, resolving the contradiction between emulsion stability and system complexity
4Stability of the object's composition
If the viscosity of the emulsifier is increased to improve emulsion formation, then the emulsion stability improves, but the ease of operation during preparation deteriorates
Solution Approach 1:
The invention optimizes the viscosity parameter of the crosslinked organopolysiloxane emulsifier by controlling the degree of crosslinking and polyether chain length. The emulsifier maintains a viscosity range that provides sufficient stability while remaining easy to handle and incorporate into formulations, resolving the contradiction between emulsion stability and ease of operation during preparation
Data Source
AI summary
The invention relates to crosslinked organopolysiloxanes which are linked by a polyether building block via the Si atoms, to emulsifier systems which have these crosslinked organopolysiloxanes, and also to cosmetic, dermatological or pharmaceutical formulations comprising a crosslinked organopolysiloxane or an emulsifier system comprising these.