To obtain a film which has so-called nerve even in case of a thin thickness and no packaging trouble in a packaging machine and can heat seal by constituting both surface layers by copolymer composition containing propylene, ethylene and specific olefin.
The multilayer stretched film comprises at least four layers of both surface layers, an oriented auxiliary layer and a core layer in such a manner that mean 100% elongation load in lateral and longitudinal directions is 100 to 600g/cm width. Both the surface layers are formed of a copolymer composition containing propylene, ethylene and at least one type of 4-8C α-olefin. In rectangular coordinates in which a melting point of the copolymer composition is an abscissa axis and a bending elastic modulus (kg/mm2) is an ordinate axis, the copolymer composition is in a range of connecting three points of coordinate points A (120, 45), B (145, 45) and C (145, 100) by straight lines.
Next Patent: MULTILAYER LAMINATE AND MANUFACTURE THEREOF