Science
Mechanism of Action
This copolymer acts by forming a cohesive and pliable film on the skin or hair, which can contribute to enhanced hydration through water-binding capabilities. Its large molecular structure prevents percutaneous absorption, ensuring its action is confined to the surface. Additionally, it provides opacifying effects, contributing to the visual characteristics of cosmetic products.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Poly(acrylamide-co-styrene) copolymers exhibit varying water solubility depending on styrene content; those with more than 4 mol% styrene tend to be water insoluble, while lower concentrations (2-4% styrene) can stabilize oil/water emulsions. Though generally hydrophobic, it is effectively used in water-based dispersion emulsions.
Conflicts
- Should not be polymerized in benzene to prevent potential benzene volatilization or leaching into the final product.
Safety
Safety Profile
The CIR Expert Panel considers Acrylamide/Acrylate Copolymers, including Styrene/Acrylamide Copolymer, safe for cosmetic use under current practices, provided formulations are non-irritating. A crucial restriction is that the acrylamide monomer concentration in cosmetic products must not exceed 5 ppm. Due to its large molecular size, percutaneous absorption is not anticipated. There is a potential for residual styrene, a possible carcinogen, but levels are minimized in compliant grades. The SCCS has not evaluated nano forms of Styrene/Acrylates copolymer, citing insufficient data for toxicity assessment.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Styrene/Acrylamide Copolymer is a valuable functional ingredient known for its film-forming and opacifying properties, with a low irritancy potential and a good safety profile when adhering to regulatory limits on monomer impurities.
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References
Sources