| abstract |
(57) [Problem] To provide a film excellent in air permeability, uniform stretching property, adhesive property, shielding property and the like. A porous film obtained by melt-forming a composition containing a polyolefin resin, a filler and a third component to form a film, and then subjecting the film to a stretching treatment, wherein the third component is hardened castor oil And a hydrocarbon polymer having a side chain. |