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Moumoujus

SODIUM METHACRYLATE/STYRENE COPOLYMER.

Valuable CAS 33970-45-5 / OPACIFYING

This anionic styrene/acrylic copolymer is a multi-functional ingredient that forms a protective, non-penetrating film on the skin's surface. It significantly contributes to skin hydration by reducing transepidermal water loss and can aid in the sustained release of active ingredients.

Summary

Film-forming agent Opacifying agent Viscosity-increasing agent Emulsion stabilizer Skin conditioning

Science

Mechanism of Action

SODIUM METHACRYLATE/STYRENE COPOLYMER functions by forming a coherent, protective film on the stratum corneum. This film physically restricts moisture evaporation from the skin, leading to enhanced hydration and a reduction in transepidermal water loss. Its large molecular structure ensures it remains on the skin's surface, providing barrier support without dermal penetration. Beyond its film-forming capabilities, it also increases product viscosity and provides an opaque appearance.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

This ingredient is optimally stable and functional within a slightly acidic to moderate pH range. Its amphiphilic nature allows it to exhibit responsive behavior to variations in pH.

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has deemed acrylates copolymers, including this category, safe for cosmetic use, provided formulations are non-irritating. While poorly formulated products may induce dermal irritation, sensitization risk is considered low. Residual monomer levels are minimized during manufacturing. It's important to note that for nano forms of Styrene/Acrylates copolymer, specifically at a maximum concentration of 0.06% in leave-on products, the SCCS could not confirm safety due to insufficient data.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
No Oily
No Sensitive
Irritancy Unknown
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

SODIUM METHACRYLATE/STYRENE COPOLYMER is a valuable multi-functional ingredient known for its film-forming, hydrating, and stabilizing properties, generally considered safe, though further data is required for nano forms at specific concentrations.

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