Science
Mechanism of Action
Based on information pertaining to Polyurethane-35, a related complex urethane polymer, POLYESTER-35 is understood to function by creating a protective, invisible film on the skin. This film enhances the water resistance of cosmetic formulations and prolongs their active efficacy. Furthermore, its presence contributes to a refined product texture, imparting a smooth and silky sensory experience upon application.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
General polyesters can be degraded by strong alkaline solutions, particularly at elevated temperatures. It is dispersed into water rather than truly soluble.
Conflicts
- strong alkaline solutions
Safety
Safety Profile
The safety profile of Polyurethane-35, a related polymer, is currently under review by the Cosmetic Ingredient Review (CIR). Concerns have been raised regarding potential residual diisocyanate monomers, which have been associated with irritant and allergic contact dermatitis, as well as skin and conjunctival irritation. While EWG rates its general irritation concern as 'low', it acknowledges animal studies showing eye and skin irritation at high doses. Conversely, SkinSAFE classifies Polyurethane-35 as 'Teen SAFE', 'Baby SAFE', 'Eyelid SAFE', and 'Irritant Free' in their assessments.
Your Skin
Skin Compatibility
Our Assessment
Verdict
POLYESTER-35 offers valuable film-forming and binding properties, enhancing product efficacy and skin feel, though its safety profile (as described for Polyurethane-35) is currently under CIR review regarding potential monomer residues.
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References
Sources