Film Former
POLY(METHYLSTYRENE ISOPROPANOL KETONE)
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A methylstyrene/isopropanol-ketone copolymer that mops up UV light to keep cosmetic formulas from breaking down in sunlight. Large molecule that stays on the surface; main caveat is supplier control of residual styrene monomer.
Function
Skin benefits
- Polymeric UV absorber that boosts photostability
- Stays on the surface — no systemic absorption
- Improves shelf-life of fragrances and actives
Known concerns
- Residual styrene monomer must be controlled at manufacture
- Polymer-specific cosmetic safety data set is small
- Aquatic ecotoxicity not fully characterised
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related film formers
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.