Science
Mechanism of Action
POLYURETHANE-52 functions primarily by forming a resilient, non-occlusive polymeric film upon application, which physically retains moisture within the stratum corneum, leading to increased hydration and a notably smoother, softer skin feel. Beyond its primary role in environmental protection against elements such as UV radiation, cold, and pollution, it also serves as an emulsifier, stabilizing oil-and-water mixtures, and acts as a rheology modifier, enhancing product viscosity and overall aesthetic. In sunscreen formulations, POLYURETHANE-52 is demonstrated to improve water, sun, and sweat resistance, contributing to superior SPF performance while simultaneously minimizing any sticky or greasy residue.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
POLYURETHANE-52, typically supplied as a dispersion, remains stable for a minimum of 6 months post-delivery when stored in its original, sealed container at 20°C. The optimal storage temperature range is precisely between 5°C and 30°C. Storage outside this range, including freezing or exposure to temperatures above 30°C, can lead to adverse changes in viscosity, average particle size, and potentially result in sedimentation or coagulation. Prior to use, thorough stirring is essential to ensure homogeneity.
Conflicts
- Formulators must carefully assess the total concentration of potential sensitizers, such as methylisothiazolinone (MI), if they are present in other raw materials combined with POLYURETHANE-52 emulsions, to prevent cumulative concentrations that could elicit skin sensitization.
- During the application and drying phases of formulations containing POLYURETHANE-52 dispersion, triethylamine is released as a volatile byproduct.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that polyurethanes, including POLYURETHANE-52, are safe for use in cosmetic products under current practices and concentrations. This safety determination is contingent upon the ingredient being appropriately formulated to be non-sensitizing and entirely free from detectable residual isocyanate or other precursor monomers. It is crucial to note that occupational exposure to diisocyanates, the monomers used in polyurethane synthesis, has been associated with adverse health effects such as occupational asthma, irritant and allergic contact dermatitis, and skin/conjunctival irritation; thus, the complete absence of residual monomers in the final cosmetic ingredient is paramount.
Your Skin
Skin Compatibility
Our Assessment
Verdict
POLYURETHANE-52 is a valuable film-former that significantly enhances skin hydration, offers environmental protection, and improves product aesthetics, with a robust safety profile when properly formulated.
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