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Moumoujus

SODIUM LANETH-40 MALEATE/STYRENE SULFONATE COPOLYMER.

Optional CAS - / FILM FORMING, HAIR FIXING, HAIR WAVING OR STRAIGHTENING

This copolymer is a film-forming ingredient primarily recognized for its capabilities in hair care, providing robust heat protection and durable style hold. While predominantly found in hair products, its film-forming property also applies to skin, offering potential textural and protective benefits.

Summary

Film-forming Hair-fixing Hair Waving or Straightening Heat protection

Science

Mechanism of Action

SODIUM LANETH-40 MALEATE/STYRENE SULFONATE COPOLYMER functions by forming a continuous, flexible film upon application to skin, hair, or nails. In hair, this film acts as a fixing agent, stabilizing styles and creating a barrier that significantly mitigates thermal damage from heat styling tools. On the skin, this film could contribute to texture improvement or provide a light, protective layer.

Research

Clinical Evidence

Medium confidence
Effective range 2–10%
Optimal

2%

Key findings

  1. 01 When incorporated into finished cosmetic hair styling products and shampoos at concentrations between 2% and 10%, this copolymer demonstrates efficacy in providing both heat protection and sustained style hold.

Transparency

Dusting Analysis

Not commonly dusted

This ingredient is a water-soluble polymer and is not typically associated with 'dusting' concerns in skincare formulations.

The Formula

Formulation

Solubility
Water
Optimal pH 4 – 9
0 7 14

Stability

The polymer exhibits excellent water solubility and is anticipated to maintain hydrolytic stability across a broad environmental pH range of 4.0 to 9.0, with significant degradation being improbable.

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
15%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel assessed a comprehensive group of 126 acrylates copolymers, including those structurally akin to this ingredient. They deemed these components safe for cosmetic use under current practices and concentrations, provided formulations are designed to be non-irritating. The maximum concentration of 15% pertains to its use as a raw material in hair products.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Optional

Primarily a hair care workhorse providing heat protection and style hold, this film-forming copolymer holds optional potential for skincare as a texture enhancer or protective agent, though dedicated dermal efficacy studies are currently limited.

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