▎ 摘　　要

NOVELTY - Multilayer composite film comprises core layer (12) in which two-dimensional plate-shaped inorganic particles are mixed with polypropylene resin copolymerized with maleic anhydride. A skin layer (11) of a polypropylene resin formed on both sides of the core layer. USE - The multilayer composite film is useful for inner sealant layer of pouch-type lithium secondary battery. ADVANTAGE - The composite film has excellent moisture permeability, has chemical resistance and heat resistance. DESCRIPTION OF DRAWING(S) - The drawing shows a configuration diagram of a three-layer composite film for an inner sealant layer of a pouch-type lithium secondary battery. Skin layer (11) Core layer (12)