Abstract: Polypropylene multi-layer sealant films for retort packaging, each including a multi-layer film composed mainly of at least one polypropylene polymer and to be laminated on one surface of a heat-resisting film, the multi-layer film having a first surface facing the heat-resisting film when laminated therewith and further having a second surface on the other side, the first surface having a surface roughness as defined below in (1), and the second surface having a surface roughness as defined below in (2): (1) (i) center-line mean roughness (Ra): 0.020 to 0.250 &mgr;m; (ii) maximum height (Rmax): 0.3 to 2.9 &mgr;m; and (iii) ten-point mean roughness (Rz): 0.2 to 2.4 &mgr;m; (2) (i) center-line mean roughness (Ra): 0.050 to 0.300 &mgr;m; (ii) maximum height (Rmax): 3.0 to 13.0 &mgr;m; and (iii) ten-point mean roughness (Rz): 2.5 to 11.5 &mgr;m.

Abstract: A gas barrier film comprising a polyamide film and an inorganic deposited layer laminated thereon, wherein the maximum shrinkage percentage after boiling treatment at 95.degree. C. for 30 minutes is not more than 3.5%. The gas barrier film of the present invention has excellent gas barrier property and water vapor-proof property even after boiling or retort treatment. Hence, the film of the present invention can serve well as a wrapping material for a wide range of objects that require high gas barrier property, such as food, medical products, industrial materials and the like, and has great industrial value.