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Moumoujus

SODIUM STYRENE/ACRYLATES/DIVINYLBENZENE COPOLYMER.

Questionable / FILM FORMING, OPACIFYING, ORAL CARE

This synthetic polymer primarily functions as a film-forming agent, creating a protective, ultra-thin barrier on skin or hair to reduce moisture loss and shield against environmental aggressors. It also enhances product texture, spreadability, and adhesion, contributing to the longevity and feel of cosmetic formulations.

Summary

Film-forming agent Opacifying Suspending agent

Science

Mechanism of Action

SODIUM STYRENE/ACRYLATES/DIVINYLBENZENE COPOLYMER forms a continuous, flexible film upon application, which acts as a physical barrier. This barrier effectively minimizes transepidermal water loss, thereby locking in hydration, and provides a defense against external irritants such as chemicals, UV radiation, and pollution. Additionally, its polymeric structure allows it to serve as an opacifying agent, rendering translucent formulations opaque and less susceptible to light penetration.

Research

Clinical Evidence

Insufficient-data confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

No specific data regarding 'dusting' behavior for this ingredient was found in the provided research.

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

Typically supplied as an anionic styrene/acrylic copolymer at 40% solids, this ingredient demonstrates optimal stability within a slightly acidic to moderate pH range. It readily forms stable aqueous dispersions. Formulations must be carefully balanced to be non-irritating, and potential residual styrene monomer levels should be minimized to compliant grades. Incompatibilities may arise with high concentrations of inorganic electrolytes.

Conflicts

  • High levels of inorganic electrolytes

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Unknown

The CIR Expert Panel deemed styrene and vinyl-type styrene copolymers, including this ingredient, safe for cosmetic use, citing large molecular size preventing percutaneous absorption and minimal residual styrene monomer levels. However, the European Commission's SCCS expressed an inability to conclude on the safety of the nano-form due to insufficient toxicity data. Of note, EWG's Skin Deep database flags a moderate concern for endocrine disruption based on peer-reviewed literature, despite low concerns for other toxicological endpoints. Products incorporating this copolymer require careful formulation to ensure they are non-irritating.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Questionable

While offering robust film-forming and moisture-retention benefits, its classification as 'unacceptable' by EWG due to moderate endocrine disruption concerns, coupled with insufficient safety data for its nano-form, positions this ingredient as questionable for precision skincare formulations.

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