Science
Mechanism of Action
On a formulation level, POLYURETHANE-59 effectively stabilizes emulsions, preventing the separation of oil and water phases, and acts as a rheology modifier to control product viscosity. For the skin, polyurethanes generally assist in mitigating roughness, imparting a softer feel, and creating a breathable barrier against external aggressors such as UV radiation, cold temperatures, and pollution.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
This ingredient demonstrates high purity, with reported levels of residual ethylene oxide below 1 ppm, dioxane below 10 ppm, formaldehyde below 1 ppm, and hexamethylenediisocyanate (HDI) below 20 ppm.
Conflicts
- Formulators must exercise caution regarding co-ingredients. If POLYURETHANE-59 is supplied within solutions containing sensitizers like methylisothiazolinone (MI), care should be taken to avoid combining multiple MI-containing solutions, which could lead to elevated concentrations.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel evaluated POLYURETHANE-59 and 65 related polyurethane ingredients, deeming them safe for cosmetic use under the condition that formulations are non-sensitizing. The panel confirmed the absence of detectable residual isocyanate or other monomers in these ingredients. POLYURETHANE-59 itself has tested non-mutagenic in an Ames assay. Cured polyurethane is generally considered inert and safe for dermal contact.
Your Skin
Skin Compatibility
Our Assessment
Verdict
POLYURETHANE-59 is a valuable formulating agent for stabilizing emulsions and controlling viscosity, with additional potential for enhancing skin texture and protection when formulated responsibly.
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References
Sources