| 摘要 |
PROBLEM TO BE SOLVED: To provide a laminate porous film which has excellent hygiene without powder falling, communication holes having high water vapor permeability required in e.g. sterilization treatments, uniformly without unevenness in the appearance and piercing strength sufficient for packaging sharp articles, such as injection needles or catheters, and is useful for e.g. a lid material in packages, e.g. medical blister packages.SOLUTION: A laminate porous film has at least three layers, i.e. a middle layer, a front layer and a back layer, and the middle layer is based on a polyolefin resin and a filler. The front and back layers are based on a polypropylene resin, contain a polyolefin-polystyrene elastomer and are drawn in biaxial directions. |
