Science
Mechanism of Action
This ingredient functions by forming a flexible, durable, and breathable polymeric film upon application to the skin. This film significantly enhances the tactile and functional performance of cosmetic formulations, improving their texture, extending wear time, and imparting water resistance. Critically, its film-forming capacity contributes to moisture retention by creating an occlusive layer that minimizes transepidermal water loss. Beyond its primary role as a film-former, it acts as a rheology modifier to increase product viscosity, an opacifying agent for aesthetic uniformity, and a robust emulsion stabilizer, especially beneficial for water-in-oil systems to prevent phase separation.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
This copolymer exhibits stability under typical formulation conditions. However, direct contact with strong oxidizing agents should be avoided as it may lead to degradation or burning.
Conflicts
- strong oxidants
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that Hydrogenated Butadiene/Isoprene/Styrene Copolymer, along with similar styrene and vinyl-type styrene copolymers, is safe for use in cosmetics under current practices and concentrations. Its large molecular weight renders percutaneous absorption unlikely. Notably, butadiene-styrene rubber is approved by the FDA as a direct food additive. While the raw solid form may cause irritation to skin, eyes, or the respiratory system during handling, this concern does not extend to its use in finished cosmetic products.
Your Skin
Skin Compatibility
Our Assessment
Verdict
This polymer is a valuable ingredient for enhancing product longevity, moisture retention, and overall texture due to its robust film-forming and stabilizing properties.
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References
Sources