Science
Mechanism of Action
This ingredient functions by forming a coherent, often flexible and breathable, polymeric film upon topical application. This film acts as a physical barrier, which can impart protective qualities or an improved aesthetic appearance within cosmetic formulations. While general polyurethanes may also be involved in tissue regeneration, Polyurethane-71's primary mechanism in cosmetics is related to film formation.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyurethane-71 is characterized as a complex polymer that is dispersed in water. It demonstrates stability under standard environmental conditions and is not expected to degrade within cosmetic products at concentrations of 5%-15%. While specific optimal pH ranges for Polyurethane-71 are not detailed, other polyurethanes have exhibited stability across broad pH ranges, such as Polyurethane-14 (pH 4-9) and Polyurethane-39 (pH 2-12).
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that polyurethanes, including Polyurethane-71, are safe for use in cosmetics. While a specific maximum safe concentration for Polyurethane-71 alone was not determined, related polyurethanes have been evaluated safely at concentrations up to 40% in solutions and are noted as stable in cosmetic products at 5%-15%. Concerns regarding potential residual diisocyanate monomers from the manufacturing process are acknowledged, but the final, cured polymers are generally considered inert and safe for skin contact, indicating a low risk of irritation or sensitization.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyurethane-71 is a safe and stable film-forming polymer, valuable for enhancing product aesthetics and longevity through its barrier properties, though specific clinical efficacy data beyond its functional role is not available.
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References
Sources