Abstract: Process for the preparation of a polyethylene multilayer film starting from linear low density polyethylene (LLDPE) by cast-extrusion, wherein the multilayer material coming out from a spreading head is collected on a first roller cooled with water maintained between 10° and 25° C. and the film coming out from the first cooling roller is sent to a second roller cooled with water maintained at a temperature lower than that of the first roller and the second roller has a peripheral velocity or speed of rotation 10-40% higher than that of the first roller. Multilayer film having a yield point and an ultimate elongation comprised within certain limits.

Abstract: Multilayer film wherein the main layer comprises as essential components linear low density polyethylene LLDPE with density values comprised between 0.915 and 0.935 g/cm.sup.3 in mixture with minor proportion of low density polyethylene LDPE or wherein the LDPE forms an adjacent layer coextruded with the layer of LLDPE.The film is prepared by cast extrusion using particular conditions of quenching and stretching.