Science
Mechanism of Action
On the skin's surface, Polyurethane-65 works by forming a cohesive and often durable film, which can provide a smooth finish and enhance product adherence. Beyond its principal role as a film former, it functions as a binder to unify ingredients, a plasticizer to impart flexibility, and a surface modifier to refine the sensory feel and application of formulations.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyurethanes, including Polyurethane-65, generally exhibit stability against significant hydrolysis within an optimal pH range of 4.0 to 9.0. However, exposure to strong acidic or basic environments outside this range can catalyze hydrolytic degradation, potentially destabilizing waterborne polyurethane dispersions and compromising product integrity.
Conflicts
- Residual diisocyanate monomers (can induce irritation and sensitization)
- Strong acidic or basic environments (risk of degradation and destabilization)
Safety
Safety Profile
The CIR Expert Panel concluded that polyurethanes are safe when specifically formulated to be non-sensitizing. While no precise maximum concentration for Polyurethane-65 is provided, other polyurethanes have been found non-irritating at concentrations up to 30%. The primary safety concern revolves around residual diisocyanate monomers; their presence can lead to occupational asthma, various forms of contact dermatitis, and irritation of the skin and conjunctiva. Thus, meticulous formulation practices are crucial. The SCCS has not specifically reviewed Polyurethane-65.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyurethane-65 is a functional polymer valuable for creating durable films and improving product texture, but its application requires precise formulation to ensure safety, given limited direct skin compatibility data.
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References
Sources