The processing of plastics films will be disturbed by a high Coefficient of Friction. This tendency to adhere to metal surfaces and to other film surfaces will be a limiting factor for high speed processing applications as packaging, handling of films, etc..
Slip additives are added to reduce the surface coefficient of friction of polymers and are used to enhance either processing or end applications. Typically slip additives have a low compatibility with the polymer which allows migration to the film surface. A good control of the compatibility controls the migration speed and thus the speed of acting performance can be engineered.