Science
Mechanism of Action
This ingredient functions primarily as a film-forming, binding, and structuring agent. It creates transparent, durable, and flexible films with excellent adhesion to the skin, which enhances surface smoothness, improves overall sensory experience, and supports long-lasting product efficacy. Beyond its film-forming properties, Polyurethane-28 also acts as an effective emulsifier, stabilizing formulations by blending oil and water components. It imparts moisturizing benefits, promoting skin softness and elasticity, and forms a protective barrier against external aggressors such as environmental pollution, cold, and sun exposure. Additionally, it possesses the capability to aid in the controlled release of active ingredients.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
No data available suggests Polyurethane-28 commonly contributes to dusting issues in formulations.
The Formula
Formulation
Stability
Polyurethane-28 exhibits robust stability under standard formulation and storage conditions, demonstrating good resistance to moisture and environmental degradation. It is reported to maintain stability at temperatures ranging from 5°C to 50°C for up to 3 years. Proper storage in sealed containers is essential to prevent drying, and protection from microbial contamination is advised. Its functional pH stability typically spans 4.0 to 8.0, though optimal range can be formulation-dependent.
Conflicts
- Extreme pH conditions should be avoided unless thoroughly tested within the specific formulation context.
- Vigilance against contamination during handling is crucial to maintain product integrity.
- Mixing with acrylic emulsions of significantly different pH without careful adjustment can lead to 'shocking,' characterized by grit formation or gellation.
- Formulations containing high concentrations of known sensitizers, such as methylisothiazolinone (MI), should be approached with caution, especially if the Polyurethane-28 raw material is supplied with such components.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed polyurethanes, including Polyurethane-28, safe for use when properly formulated to be non-sensitizing. This complex polymer is developed to be free from residual isocyanate or other monomers that might cause concern. Formulators are advised to be mindful of potential sensitizers, such as methylisothiazolinone (MI), if they are present in certain commercially supplied polyurethane emulsions or solutions, to prevent their accumulation to significant levels in the final product.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyurethane-28 is a valuable multifunctional polymer, enhancing product performance, skin feel, and protection across a broad range of skincare and cosmetic applications due to its film-forming, moisturizing, and stabilizing properties.
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References
Sources