To provide a polypropylene-based film for a retort that has excellent heat stability, impact resistance and blocking resistance and has good sanitation for use as a retort packaging sealant, and to provide a retort laminated packaging bag having the film as an innermost layer.
The film comprises a propylene/ethylene block copolymer having a melting point of 150-168°C. The film has a three-dimensional surface roughness (center plane average roughness) (SRa1) of 0.08-0.50 μm and a surface roughness deformation rate represented by a formula (1) of -10-50%: surface roughness deformation rate = (SRa1-SRa2)/SRa1 (1), wherein SRa1: three-dimensional surface roughness of a film (center plane average surface roughness) and SRa2: three-dimensional surface roughness of a film subjected to pressure treatment (a load of 14.4 MPa was applied to a film surface under an atmosphere of 50°C for 30 minutes).
ODA NAONOBU
NAGANO HIROMU
YONEYAMA TADAO
