Science
Mechanism of Action
POLYURETHANE-17 operates by forming a cohesive and continuous film upon application to biological surfaces such as the skin, hair, or nails. This polymeric layer modifies the surface, enhancing product performance through improved adherence, texture, and potentially protective properties.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
POLYURETHANE-17 is typically supplied as an aqueous dispersion. While its specific pH stability range is not explicitly defined, related polyurethanes demonstrate stability across various pH levels (e.g., pH 4-9 or pH 7-11). The general stability of polyurethanes in cosmetic formulations is robust, often lasting up to 3 years within a temperature range of 5 to 50°C.
Conflicts
- Nitrosating systems, due to the potential for nitrosamine formation from residual trialkylamines within the ingredient.
- High concentrations of potential sensitizers, such as methylisothiazolinone (MI), if present in raw material dispersions and inadvertently accumulated through combining multiple sources.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has determined that polyurethanes, including POLYURETHANE-17, are safe for use in cosmetics when formulated to be non-sensitizing and free from detectable residual isocyanate or other monomers. In Europe, under EC Cosmetics Regulation (Annex III), specific restrictions apply to residual trialkylamines, which must not exceed 2.5% in ready-for-use leave-on products. Furthermore, trialkylamines must be formulated without nitrosating systems, adhere to a maximum secondary amine content of 0.5%, a maximum nitrosamine content of 50 µg/kg, maintain a minimum purity of 99%, and be stored in nitrite-free containers. Formulators must also be cognizant of potential sensitizers, like methylisothiazolinone, that may be present in raw material dispersions and avoid their excessive accumulation.
Your Skin
Skin Compatibility
Our Assessment
Verdict
POLYURETHANE-17 is an optional ingredient, primarily valued for its film-forming properties, and is considered safe for cosmetic use when formulated in adherence to regulatory and safety guidelines.
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References
Sources