Science
Mechanism of Action
POLYURETHANE-77 functions by modulating the viscosity of cosmetic products, allowing for a tailored texture and application experience. Upon topical application, it creates a resilient film on the skin's surface, which not only provides a protective barrier but also improves the product's resistance to water. This film-forming capability can prolong the residence time and efficacy of other active ingredients. Furthermore, it contributes to a refined sensory profile, imparting a smooth and luxurious feel to the skin, and can facilitate adhesion through interpenetrating polymer network formation without causing irritation.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyurethanes are typically supplied as emulsions or solutions, with the specific chemistry influencing their stability and chemical resistance. While some pH-responsive polyurethanes demonstrate stability at physiological pH (around 7.4) and degradation at acidic pH (4.0-6.5), and others swell at pH values below 3.0 or above 6.0, general urethane stability is affected by factors such as concentration, temperature, and duration of chemical contact.
Conflicts
- Concentrated acids (e.g., Hydrochloric Acid 37%, Sulfuric Acid 50%)
- Strong bases (e.g., Sodium Hydroxide 40%)
- Ketones (e.g., Acetone, Cyclohexanone, Methyl Ethyl Ketone)
- Halogen compounds (e.g., Dichloromethane)
- Aromatic Hydrocarbons (e.g., Xylene)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has assessed the safety of a broad category of 66 polyurethane ingredients, including POLYURETHANE-77, concluding they are safe under current practices of use and concentration, provided they are formulated to be non-sensitizing. Crucially, cosmetic products containing polyurethanes must be formulated without detectable residual isocyanates or other monomers, as exposure to diisocyanates can lead to occupational asthma, irritant/allergic contact dermatitis, and skin/eye irritation. Formulators should also be aware that commercially supplied polyurethane emulsions or solutions may contain known sensitizers like methylisothiazolinone (MI), and cumulative concentrations of such impurities should be strictly avoided. General studies on polyurethanes in medical devices have reported mild or no inflammatory responses.
Your Skin
Skin Compatibility
Our Assessment
Verdict
POLYURETHANE-77 is a valuable ingredient for enhancing product aesthetics, controlling rheology, and providing film-forming, water-resistant properties, contingent on rigorous formulation to ensure purity and prevent sensitization risks.
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