Science
Mechanism of Action
This ingredient functions primarily as a film-forming agent, creating a resilient layer on the skin's surface. This invisible film actively reduces transepidermal water loss, thereby preserving optimal skin hydration, diminishing tactile roughness, and promoting a supple feel. Additionally, it establishes a physical barrier that shields the skin from environmental stressors such as UV exposure, cold, and atmospheric pollutants.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyurethane-46 is synthesized with methoxy PEG-20 to impart flexibility and enhance its hydrophilic characteristics, rendering it water-dispersible or soluble. Aqueous polyurethane dispersions are generally stable, with their longevity influenced by factors such as acid content.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel, in a 2017 safety assessment, determined that polyurethanes, including Polyurethane-46, are safe for cosmetic use under specific manufacturing conditions. The primary restriction relates to the potential for residual diisocyanate monomers, which have been linked to occupational asthma and contact allergies. However, the assessment concluded that harmful levels of these residues are not significant in properly manufactured Polyurethane-46, which is typically formed by reacting isophorone diisocyanate (IPDI) with three polyols.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyurethane-46 offers valuable film-forming, moisturizing, and protective barrier benefits for the skin, with a low risk of sensitization when properly manufactured, though detailed skin type compatibility data remains limited.
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References
Sources