Acrylates/Ammonium Methacrylate Copolymer

Acrylates/Ammonium Methacrylate Copolymer is a synthetic polymer—a long chain of molecules bonded together—commonly used in skincare formulations. It belongs to a family of film-forming agents that have established use in pharmaceutical and cosmetic applications, particularly in transdermal delivery systems.

In skincare products, this ingredient functions as a film former, meaning it creates a thin, continuous layer across the skin's surface. It also has antistatic properties, which can help reduce unwanted charge buildup on the skin. The ingredient is used sparingly in formulations, typically appearing in less than 1% of skincare products.

When applied to skin, this copolymer forms a cohesive film—essentially a thin, uniform coating—across the surface. This happens as the formulation dries or sets, with the polymer molecules linking together to create a continuous protective layer.

The film-forming action can help reduce transepidermal water loss (TEWL) by creating a physical barrier, though the degree of occlusion depends on film thickness and formulation composition. Its antistatic function works by reducing electrical charge accumulation, which can improve the tactile feel of products and potentially reduce friction-related irritation.

This ingredient is typically incorporated into formulations by manufacturers rather than used as a standalone product. If present in your skincare, it will appear in the ingredient list. Apply products containing this polymer as directed, allowing sufficient time for the film to form—usually a few minutes after application.