FILM FORMER IN FILM COATING

The presentation of this work aims to update professionals on issues associated with selecting the film former in the film coating process. Film coating finds applicability in a diverse field that may be for conventional (immediate) release and modified-release intended for enteric/ delayed-release or barrier membrane controlled release (extended-release). In the pharmaceutical field, film coating of the substrate is achieved by spraying the coating material in liquid medium onto them. The formulation of coating material is a solution or dispersion of film-forming polymers and excipients in aqueous or organic solvents. Film formers are the chief amongst the component of coating formulation that delineates the functional properties of the film-coated pharmaceutical along with other factors like additives, process, equipment, technology and many others. Polymers used as film former are available in different grades, determined by their molecular weight and viscosity. Their glass transition temperature (Tg), along with the grade of polymer, influences the film coating process along with the functional properties of the film coat. Summarised information on the technical aspect of film former is rare, necessitating this work. The information was studied, summarised, and attempted to be presented for convenience and enrichment of stakeholders in the pharmaceutical field. The contained information will be updating professionals in this regard.