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POLYQUATERNIUM-4/HYDROXYPROPYL STARCH COPOLYMER

CAS -
75

Safety score · 0–100

Fine

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

About

A substantive polymer combining quaternary ammonium conditioning with starch-derived texture, used in hair and skincare formulations.

Polyquaternium-4/hydroxypropyl starch copolymer is a polymeric ingredient obtained by reacting polyquaternium-4 with hydroxypropyl starch. It provides substantive conditioning benefits (from the quaternary ammonium group) along with starch-derived texture and film-forming properties. It is listed in EU CosIng without specific restriction and is considered safe for cosmetic use. The copolymer is particularly useful in hair care for its substantivity and in skincare for its smooth skin-feel properties.

Skin benefits

  • Provides substantive conditioning and film-forming properties
  • Improves texture and sensory feel of formulations
  • Combines cationic and natural polymer benefits

References

EU

EU CosIng database

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

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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.