Science
Mechanism of Action
This polymer operates by stabilizing immiscible phases as an emulsifier, ensuring product uniformity. It forms a breathable yet protective film on the skin's surface, which helps to retain moisture, impart elasticity, and shield against external factors like pollution and temperature fluctuations. This film-forming action also smooths the skin’s microrelief, reducing roughness. Furthermore, POLYURETHANE-92 imparts a luxurious, silky feel to cosmetic preparations, significantly improving spreadability, enhancing water resistance, and contributing to the extended wear of the product.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
pH critically influences polyurethane hydrolysis, with acidic conditions accelerating breakdown. Polyether types are more stable in alkaline environments and moisture, forming basic amine end groups. Polyester types are more susceptible to hydrolysis and biodegradation, leading to increased acidity. Maintaining a pH between 7.8 and 8.3 is crucial for optimal performance, especially for polyurethane dispersions.
Conflicts
- Formulators must carefully monitor the total concentration of co-formulated sensitizers, such as methylisothiazolinone (MI), which may be present in raw material solutions containing POLYURETHANE-92, to prevent exceeding safe thresholds.
- When integrating with acrylic emulsions, it is critical to precisely match the pH of the acrylic emulsion to POLYURETHANE-92's optimal range of 7.8-8.3, typically using a diluted ammonia solution, to ensure polymer compatibility and prevent formulation instability.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has evaluated 66 polyurethane ingredients, concluding their safety in cosmetics when formulated to be non-sensitizing and free from detectable residual isocyanates or monomers. While POLYURETHANE-92 was not individually specified, it falls within this general safe category. The FDA also regulates polyurethane use in cosmetics. Medical device applications generally show mild or no inflammatory responses.
Your Skin
Skin Compatibility
Our Assessment
Verdict
POLYURETHANE-92 is a valuable multi-functional ingredient that enhances skin hydration, offers environmental protection, and improves product texture and longevity, while being broadly compatible with various skin types.
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References
Sources