Mask Pack Using Temperature-Sensitive Sol-Gel Transition Hydrogel

High-Absorption Mask Pack Based on Phosphate Polymer Hydrogel That Gels at Body Temperature

This technology features a temperature-sensitive mask pack created by aging and bonding hydrophilic or amphiphilic polymers containing two or more phosphate groups with polyvalent cations to form a hydrogel that transitions from a sol to a gel between 10–50°C, which is then applied to a mask pack substrate along with skin-active ingredients.

Non-woven mask packs tend to become stiff when saturated with essence, have poor skin adhesion, and suffer from moisture evaporation, causing them to fall off after just 10–15 minutes. Hydrogel packs that maintain a gel state take a long time for ingredients to penetrate, while types that melt into a liquid at body temperature have limited efficiency because the ingredients evaporate after the phase change.

This technology initially exists in a liquid sol state to allow for the rapid, high-volume penetration of skin-active ingredients. It then gels upon contact with skin temperature to form a surface film, preventing the evaporation of moisture and active ingredients. Applicable to sheet masks, hydrogel packs, and natural extract-based moisturizing and nourishing products, it significantly enhances the absorption rate and perceived efficacy of active ingredients using the same amount of raw materials.

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Key Features:

• Hydrogel manufactured by mixing and aging a hydrophilic or amphiphilic polymer containing two or more phosphate groups with polyvalent cations corresponding to their negative charges
• Composition comprising a temperature-sensitive sol-gel transition hydrogel that transitions from a sol state to a gel state within a temperature range of 10–50°C and skin-active ingredients on a mask pack substrate
• Mask pack composition consisting of 1–30 wt% hydrogel, 1–20 wt% skin-active ingredients, 1–30 wt% additives, and the balance of water
• Configuration using divalent or higher metal cations such as Mg2+, Ca2+, Fe2+, Fe3+, Al3+, Cu2+, Zn2+, or low/high-molecular-weight cations with two or more ammonium cations as the polyvalent cation

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