What it is
Acrylates/Stearyl Methacrylate Copolymer is a synthetic polymer combining acrylate units with stearyl methacrylate, whose fatty side chain lends a smooth, conditioning feel. It is used in sunscreens and color cosmetics as a film former that helps the product set into an even, long-wearing layer and improves sensory texture. It functions at low to moderate levels within the formulation.
Safety & warnings
Film-forming acrylate copolymers are generally non-irritating and non-sensitizing and are too large to be absorbed through skin. They are not considered comedogenic at usual levels.
Origin & sourcing
Synthetic; produced by copolymerizing acrylate monomers with stearyl methacrylate.
Questions everyone asks
What is this copolymer used for?
It forms a smooth film that helps a sunscreen or makeup set evenly and wear longer while improving feel.
Does it provide sun protection?
No. It is a structural and sensory polymer, not a UV filter.