Oil-in-Water Microemulsion for High Transparency and Cleansing

The patent combines polyglycerol fatty acid esters with specific auxiliary emulsifying agents (2-hydroxy fatty acids with 10-22 carbon atoms or betaine acids) to create a composite surfactant system. This composite approach enhances the emulsifying capacity and stability while maintaining the safety benefits of polyglycerol fatty acid esters, resolving the contradiction between safety and emulsifying performance.

The patent specifies precise parameter ranges for the auxiliary emulsifying agents (2-hydroxy fatty acids with 10-22 carbon atoms or betaine acids) to optimize the microemulsion formulation. By controlling the type and amount of auxiliary agents, the system achieves high emulsifying capacity and stability while maintaining safety, addressing the limitations of using polyglycerol fatty acid esters alone.

The patent inverts the conventional water-in-oil microemulsion structure to create an oil-in-water type microemulsion. This inversion allows the system to maintain high water content while improving affinity to water-based makeup stains through the synergistic effect of low interfacial tension and added oil, resolving the contradiction between water content and stain affinity.

The patent optimizes the oil-to-water ratio and surfactant composition in the oil-in-water microemulsion to achieve both high water content and effective cleansing of water-based makeup stains. By carefully controlling the parameters of oil phase, water phase, and surfactant system, the formulation maintains versatility against different types of makeup stains while incorporating significant amounts of water.

The patent inverts the microemulsion structure from water-in-oil to oil-in-water type, which fundamentally changes the viscosity characteristics. The oil-in-water structure with specific surfactant combinations achieves low viscosity that enables use with cotton and pump foamers while maintaining high cleansing effects through the synergistic action of surfactants and oil phase.

The patent controls the viscosity parameter by optimizing the surfactant concentration, oil phase composition, and water-to-oil ratio in the oil-in-water microemulsion. This parameter optimization ensures the product has sufficiently low viscosity for cotton application and pump foamer compatibility while preserving effective cleansing performance.

The patent creates a composite system combining oil phase, water phase, and specifically selected surfactants (polyglycerol fatty acid esters with auxiliary emulsifying agents) to achieve synergistic effects. This composite formulation maintains transparency through low interfacial tension while simultaneously enhancing cleansing power against both water-based and oil-based makeup stains.

The patent optimizes the interfacial tension parameter by selecting and combining specific surfactants with appropriate HLB values. This parameter control ensures transparency is maintained while the optimized surfactant system, working synergistically with the oil phase, delivers enhanced cleansing power against various types of makeup stains.