<p>A monolayer polypropylene film is obtained by melt extrusion from a composition comprising 100 parts by weight of a crystalline polypropylene and of from 0.05 to 1 part by weight of a slipping agent [A] having a melting point of 100 DEG to 125 DEG C and a slipping agent [B] having a melting point of 70 DEG to 90 DEG C; the initial coefficient of friction of the film being 0.7 or less and the coefficient of friction after heating at 60 DEG C being 1.0 or less. A multilayer film comprises a polypropylene film layer having the same ingre dients as defined above together with a substrate layer; the polypropylene film layer having an initial coefficient of friction of 0.7 or less and the coefficient of friction film reaching a value of 0.7 on heating to 45 DEG C or more.</p>
