Science
Mechanism of Action
Once applied and cured, Polyurethane-50 creates a durable, inert, and stable film on the skin's surface, which helps to form a protective barrier. This polymeric structure also enables it to bind other ingredients, modify the surface properties of formulations, and contribute to their overall stability. In advanced applications, specific polyurethane hydrogels can influence molecular mobility for controlled skin delivery of active compounds.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
The hydrolytic stability of polyurethanes, including Polyurethane-50, is sensitive to factors such as temperature and pH. When combining Polyurethane-50 dispersions with other emulsions (e.g., acrylics), it is crucial to ensure pH compatibility to prevent 'shocking,' which can manifest as grit formation or gellation within the product.
Conflicts
- Sensitizers (e.g., methylisothiazolinone) in raw material emulsions or solutions, if their combined concentrations exceed safe regulatory limits.
- Strong chemicals, including acetone, xylene, gasoline, and concentrated sulfuric acid, which can induce degradation, swelling, or discoloration of general polyurethane materials.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel evaluated a group of 66 polyurethane ingredients, including Polyurethane-50, concluding they are safe for cosmetic use when properly formulated to be non-sensitizing. This determination assumes no detectable residual isocyanates or other monomers in the final ingredient. The FDA also provides specific guidelines for polyurethane resins used in applications that may contact food.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyurethane-50 is a valuable functional ingredient in skincare and cosmetics, acting as a safe film-former and binder to enhance product stability, texture, and protective barrier properties.
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References
Sources