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Moumoujus

OCTADECENE/MA COPOLYMER.

Questionable CAS 25266-02-8 / LIGHT STABILIZER, VISCOSITY CONTROLLING

OCTADECENE/MA COPOLYMER is a synthetic polymer primarily utilized in skincare to enhance product stability against light degradation and to precisely control formulation viscosity. Its dual hydrophobic and polar characteristics also contribute to improved water resistance in emulsions.

Summary

stabilising viscosity controlling light stabilizer thickening chelating surfactant

Science

Mechanism of Action

This polymer is synthesized from 1-octadecene and maleic anhydride monomers. The maleic anhydride component introduces polarity, while the extended hydrocarbon chain from octadecene imparts hydrophobicity, collectively improving water resistance and overall formulation integrity. Its primary functions involve light stabilization and precise viscosity management, with secondary roles as a thickening agent, chelant, or surfactant.

Research

Clinical Evidence

Insufficient-data confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

The copolymer demonstrates thermal stability. Its reactive anhydride groups allow for versatile derivatization into various forms, including acid salts, amides, esters, or imides.

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Moderate

While Environment Canada and EWG Skin Deep classify OCTADECENE/MA COPOLYMER with low concern for general toxicity and environmental impact, chemical hazard classifications ('Eye Irrit. 2', 'Skin Irrit. 2', 'STOT SE 3') indicate potential for irritation to skin, eyes, and respiratory system. Expert opinion suggests it may induce irritation, inflammation, and dryness, especially for sensitive individuals or when formulated with other irritants. Formal review by the CIR is pending.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Questionable

OCTADECENE/MA COPOLYMER serves beneficial formulation roles in stability and texture but its documented potential for irritation, particularly for sensitive skin, warrants careful consideration.

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