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Emulsifier

AMMONIUM STYRENE/MA COPOLYMER

CAS 26022-09-3
75

Safety score · 0–100

Fine

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

An ammonium salt of styrene-maleic anhydride copolymer used as an emulsion stabilizer. Cured polymer is high-MW and inert; the styrene monomer is an IARC 2A probable carcinogen, so residual control is essential.

Function

EMULSION STABILISING

Skin benefits

  • Stabilizes oil-in-water emulsions
  • Forms protective colloidal films
  • Effective at low use levels

Known concerns

  • Residual styrene monomer is an IARC 2A probable carcinogen
  • Residual maleic anhydride is a respiratory sensitizer
  • Modern grades control residuals to <50 ppm

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

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Same plant / compound family

56
AMMONIUM STYRENE/MA COPOLYMER ETHANOLAMIDE
Film Former

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.