Crosslinking Organopolysiloxane Polymers for Cosmetic Emulsion Stability

The patent uses a composite thickening system combining crosslinking organopolysiloxane (forming a three-dimensional network structure) with specific hydrophilic thickeners (polyoxyalkylene or polyglycerin). This composite approach creates a stable network that can trap and disperse low viscous silicone oil effectively, preventing separation while maintaining the oil's spreadability benefits.

The patent changes the molecular structure parameters of the polysiloxane by introducing crosslinking groups and controlling the degree of substitution. By adjusting the crosslinking density and hydrophilic group content, the formulation achieves optimal balance between stability (preventing oil separation) and spreadability (maintaining light feeling).

The patent creates local quality differences within the emulsion structure by using crosslinking organopolysiloxane to form a stable three-dimensional network in the continuous phase, while the dispersed oil droplets maintain their individual mobility. This allows the formulation to be stable during storage (network structure) but remain spreadable on skin (mobile droplets).

The patent creates a dynamic system where the crosslinked polysiloxane network provides structural stability during storage, but the emulsion structure can dynamically adjust and spread when applied to skin. The network structure breaks down or redistributes under shear stress during application, extending the playing time while maintaining storage stability.

The patent optimizes the parameter of hydrophilic group content within a specific range (0.5-20% by mass) to achieve the desired balance. By controlling this parameter, the formulation gains sufficient water emulsifying capability while preventing excessive hydrophilicity that would reduce spreadability and light feeling.

The patent creates a composite system where crosslinking organopolysiloxane with controlled hydrophilic groups works synergistically with additional hydrophilic thickeners. This composite approach allows the polysiloxane to maintain its lipophilic character for spreadability while the combined system achieves adequate water emulsifying properties through the synergistic effect of both components.