Flame retardant metallized polyester films having anti-dripping properties

摘要

A metallized flame retardant polyester film comprising varying levels of phosphorous in the individual film layers. The phosphorous loading disposes the minimum amount of phosphorous required to impart flame retardancy to the film. In embodiments, the film is a multi-layer film and the outer most layer or layers of the film comprise higher levels of phosphorous than then inner most layer or layers. The inner layer or layers may be phosphorous-free. The differential phosphorous loading imparts flame retardant properties to the film while minimizing the use of costly phosphorous.