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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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3 Replies
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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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Thank you so much !!
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This is a milk, not lotion. You would use a solubalizer or very low viscosity emulsifier like scleortium gum. Its not very stable but it works in my sunscreen milk. My most unpopular product. I’m not sure why, its so luxurious. Milks are super skin care products.
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