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SODIUM STYRENE/MA COPOLYMER.

Valuable CAS 52500-92-2 / EMULSION STABILISING, SKIN CONDITIONING

SODIUM STYRENE/MA COPOLYMER is a synthetic polymer engineered to enhance cosmetic formulations. It primarily acts as an emulsion stabilizer, ensuring product consistency and integrity, while also functioning as a skin conditioning agent. This ingredient helps to maintain optimal skin condition and contributes to a smooth, refined feel.

Summary

emulsion stabilising skin conditioning film-forming

Science

Mechanism of Action

This copolymer mechanically supports emulsion formation, thereby preventing phase separation and improving overall product stability. When applied to the skin, it forms a pliable, cohesive, and continuous film, which conditions the skin's surface. This film imparts a smooth tactile sensation and may possess water-binding capabilities, contributing to skin hydration.

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 6 – 9
0 7 14

Stability

For optimal effectiveness, related styrene-maleic acid copolymers typically perform best within a pH range of 6.0 to 9.0. While low salt levels generally enhance polymer solubility, higher concentrations of salts, particularly those containing millimolar divalent cations, can induce polymer precipitation by binding to the negatively charged maleic acid groups.

Conflicts

  • divalent cations (can cause precipitation)

Safety

Safety Profile

CIR Status
Safe with restrictions
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel deemed related 'Sodium Styrene/Acrylates Copolymer' and 'Styrene/Acrylates Copolymer' safe for cosmetic use, assuming minimal absorption due to their large molecular weight. Proper formulation is crucial to avoid irritation and minimize potential residual styrene, a recognized concern. For the nano form of these copolymers, specifically at concentrations exceeding 0.06% in leave-on products, the SCCS has not concluded on safety due to insufficient data.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

SODIUM STYRENE/MA COPOLYMER is a valuable ingredient for enhancing product stability and texture, while also offering skin conditioning benefits with a generally low irritancy risk, provided it is properly formulated.

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