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About Sunscreen of La Roche-Posay
Hello everyone, this is a formula of sunscreen milk of La Roche-Posay. I am confused because I see no emulsifier in this formula. Could anyone explain why? And type of emulsion in this case, O/W or W/O?
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1 Reply
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There is no emulsifier in a classical meaning. The product is a dispersion of oil phase in water phase. They use C12-22 alkyl acrylate/hydroxyethylacrylate copolymer polymeric thickener to achieve this. They thicken water and oil droplets have no possibility to move around and join together -> separate.
Not all thickeners can do this. For example Gums are not good for this. Mostly polymeric thickeners (like Sepimax Zen or Lecigel) are suitable.
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