Acrylates/Stearyl Methacrylate Copolymer

Acrylates/Stearyl Methacrylate Copolymer is a synthetic polymer formed by combining acrylate monomers with stearyl methacrylate. It is created through chemical polymerisation and does not occur naturally. In skincare formulations, it functions as an emulsion stabiliser and viscosity controller, helping to keep oil and water phases blended and maintaining the desired consistency of creams, lotions, and serums.

This ingredient is used in a small proportion of skincare products (roughly 0.1%), typically appearing in moisturisers and other leave-on treatments where a stable, uniform texture is important.

This polymer works by forming a film-like network within an emulsion. The stearyl methacrylate component has an affinity for oils, whilst the acrylate backbone interacts with the aqueous phase. Together, they anchor themselves at the interface between oil and water droplets, preventing them from coalescing and separating.

The polymer also increases the viscosity of the formulation, thickening the product to the desired consistency. This both improves the sensory experience and helps stabilise the emulsion mechanically.

No special application technique is required. Use products containing this ingredient as directed on the label. It is a background ingredient and does not require any particular timing or complementary actives to function effectively.