How we scored it
Where it comes from
Copolymerized from petrochemical hydroxypropyl methacrylate and PEG methacrylate, quaternized with an ethyltrimonium chloride methacrylate monomer. No natural-feedstock route exists.
In plain English
A film-forming conditioning polymer used in hair products, built from synthetic hydroxypropyl and PEG methacrylate monomers combined with a synthetic quaternary ammonium monomer.
CosIng definition: Polyquaternium-91 is a polymeric quaternary ammonium salt of hydroxypropyl methacrylate and polyethylene glycol methacrylate quaternized with ethyltrimonium chloride methacrylate
Natural alternatives with the same function
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References
- 1ISO 16128-1:2016 and ISO 16128-2:2017 — Guidelines on technical definitions and criteria for natural and organic cosmetic ingredients and products. ISO, Geneva.
- 2POLYQUATERNIUM-91. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
- 3POLYQUATERNIUM-91. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=POLYQUATERNIUM-91