Phthalic Anhydride …

Phthalic anhydride/benzoic acid/glycerin copolymer is a synthetic polymer created by combining three chemical building blocks: phthalic anhydride, benzoic acid, and glycerin. This combination produces a resin-like substance that is commonly used in skincare and cosmetic formulations.In skincare products, this ingredient functions primarily as a film former. This means it creates a thin, continuous layer across the skin's surface, which can help improve the texture and appearance of the skin, as well as provide a smooth base for other product applications.

This copolymer works by depositing on the skin's surface and forming a continuous, flexible film. Once applied, it dries to create a thin polymeric layer that sits on top of the skin, rather than penetrating deeply into the epidermis. This film-forming action smooths the skin's texture and can create a more uniform appearance.The glycerin component of the polymer may also contribute mild humectant properties, helping to attract and retain some moisture at the skin surface, though the primary function remains film formation.

This ingredient is typically incorporated into formulations by manufacturers rather than used as a standalone product. When using products containing this polymer, apply as directed on the product label. It works well as part of a broader skincare routine and does not require special timing or additional steps. Allow time for the product to dry fully before applying other layers to avoid pilling or separation.

This ingredient is generally well-tolerated and has a long history of use in cosmetics. It is not known to be a common irritant or sensitiser, though as with any ingredient, individual sensitivities can occur.