2 from schulman dispersed in polypropylene the release films of the comparative example c and also of inventive example 3 ie3 are in each case composed of six layers the release films of inventive examples ie1 and ie2 are composed of four and respectively five layers the total layer thickness of the release films of the comparative example c and also of inventive example ie3 is respectively 26 u03bcm the total layer thickness of the release films of inventive examples ie1 and ie2 is respectively 23 5 u03bcm and 24 5 u03bcm in each case the individual layers of the release films are immediately adjacent to one another in the sequence in which they have been listed below the individual layers s a c e f and g of the release films of inventive example ie3 and also of c were respectively produced via blown film coextrusion and were coated respectively with a release layer b in a subsequent operation the individual layers s a c and d of the release films of inventive examples ie1 and ie2 were respectively produced via blown film coextrusion and were coated on one side and respectively both sides with a release layer b in a subsequent operation the foam structures of the layer s of the release films of inventive examples ie1 ie3 is based on expanded hollow microparticles distributed in the layer s in contrast the release film of the comparative example c has no foam structure but instead has.