Fluorinated Propene Emulsions for Stable Personal Care Foams

The patent changes the chemical parameters of the foaming agent from volatile hydrocarbons to fluorinated propene compounds (trans-1-chloro-3,3,3-trifluoropropene and trans-1,3,3,3-tetrafluoropropene), which have different volatility and reactivity characteristics. This parameter change allows the formulation to maintain stability while still achieving effective foaming, as the fluorinated compounds are less prone to degradation and provide more controlled foam formation.

The patent employs preliminary action by formulating the product as a stable gel or emulsion that is ready for application but has delayed foaming. The fluorinated propene compounds remain stable in the formulation until applied, then gradually release to form foam. This allows the product to be spread on the skin in its stable gel form first, ensuring good distribution and penetration, before gradually forming foam for the intended effect.

The patent replaces expensive and potentially irritating sensate ingredients with a cheaper, safer alternative: the fluorinated propene compounds themselves provide a mild cooling effect through their evaporation and heat absorption, without the need for additional sensate additives. This eliminates the cost and allergy risk associated with traditional sensates while maintaining the desired cooling sensation.

The patent changes the physical parameters of the formulation by using fluorinated propene compounds that provide inherent clarity and light transmission. The unique optical properties of these fluorinated compounds allow the formulation to achieve transparency without requiring high surfactant concentrations or intensive mixing processes needed for traditional microemulsions.