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SODIUM ACRYLATE/METHYLSTYRENE/STYRENE COPOLYMER.

Valuable / BINDING, NAIL CONDITIONING

SODIUM ACRYLATE/METHYLSTYRENE/STYRENE COPOLYMER is a precision polymer designed to form a protective, breathable film on the skin, effectively locking in moisture and reducing transepidermal water loss. Beyond its hydrating capabilities, it significantly enhances product stability, texture, and contributes to the controlled release of active ingredients.

Summary

film-forming emulsion stabilising viscosity controlling opacifying water-binding pigment-binding binder agent controlled release agent

Science

Mechanism of Action

This copolymer's primary mechanism involves creating a micro-fine, protective film on the skin's surface. This film acts as a physical barrier, actively reducing moisture evaporation and thereby improving sustained skin hydration. Functionally, it also stabilizes emulsions, preventing separation, and acts as a binder to impart a silky, homogeneous texture to formulations. Its inherent properties include increasing viscosity, binding both water and pigments, and potentially facilitating the gradual, extended release of encapsulated active ingredients.

Research

Clinical Evidence

Medium confidence
Effective range ≥1%
Optimal

1%

Key findings

  1. 01 A study on a closely related ingredient, Styrene/Acrylates Copolymer, demonstrated an increase in sunscreen SPF values by approximately 11-18% per 1% concentration, concurrently improving water resistance in formulations.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

Optimal stability is observed in formulations with a pH ranging from slightly acidic to moderately neutral.

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Low

The CIR Expert Panel has determined styrene and related vinyl-type styrene copolymers, including this ingredient, as safe for cosmetic applications due to their substantial molecular weight, which significantly limits percutaneous absorption. They are considered safe for current usage practices and concentrations when carefully formulated to prevent irritation. While residual styrene monomer, a classified carcinogen, is a potential concern, its levels are strictly minimized in compliant cosmetic grades and do not pose a safety risk. However, it's notable that for nano forms of related copolymers (Styrene/Acrylates copolymer and Sodium Styrene/Acrylates copolymer), the SCCS identified insufficient data to conclude on safety, particularly for leave-on products where concentrations might exceed 0.06%.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Unknown
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

This multifunctional copolymer is a valuable asset for enhancing formulation stability, supporting skin hydration through efficient film formation, and potentially boosting SPF in sunscreens, demonstrating broad compatibility and a favorable safety profile.

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