Science
Mechanism of Action
Operating primarily as a film-forming agent, Polyurethane-2 creates a lightweight, invisible layer on the skin's surface. This barrier effectively minimizes transepidermal water loss, thereby maintaining optimal skin moisture levels. Broader functions within the polyurethane class include emulsification, conditioning, and reinforcing the skin's natural protective shield, resulting in reduced roughness, increased softness, and improved elasticity.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyurethane-2, like other polyurethane dispersions (PUDs), requires careful formulation. Compatibility with acrylic emulsions necessitates pH adjustment, typically with diluted ammonia, to prevent destabilization. Related polyurethanes, such as Polyurethane-28, demonstrate stability between 5-50°C for up to 3 years, and Polyurethane-35 maintains integrity at 5%-15% concentrations under normal environmental conditions. Generally, polyurethanes exhibit resilience to acidic environments.
Conflicts
- Direct exposure to liquid polyurethane can cause skin irritation or chemical burns.
- Prolonged exposure to strong acids (e.g., 98% sulfuric acid, 37% hydrochloric acid) may induce degradation or severe effects.
- Certain solvents, including acetone, benzene, ethyl acetate, carbon tetrachloride, cyclohexanone, methyl ethyl ketone, and diethylformamide, can lead to significant swelling or breakdown.
- Strong bases, such as ammonium hydroxide, can also have severe adverse effects.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel deems polyurethanes, including Polyurethane-2, safe for cosmetic use under specific restrictions. This safety relies critically on the absence of detectable residual isocyanates or other monomer impurities, as diisocyanates are known occupational sensitizers linked to asthma and dermatitis. While a specific SCCS opinion for Polyurethane-2 is unavailable, some polyurethanes are FDA-regulated for specific food-contact applications. Studies on polyurethanes in medical devices frequently report only mild, localized inflammatory responses.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyurethane-2 offers valuable film-forming, hydrating, and barrier-protective properties, provided formulations meticulously ensure the absence of residual monomer impurities.
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