| 摘要 |
Purpose: The present invention provides a multi-layer film comprising a polyolefin film, an aluminum foil and a polyamide layer which are laminated sequentially, wherein the aluminum foil is adhered directly to the polyolefin film without any anchor coat agent or adhesive and the multi-layer film is excellent in adhesion strength between the polyolefin film and the aluminum foil and in low-temperature resistance. The multi-layer film according to the present invention comprises an aluminum layer (B) subjected to chromium-free chemical conversion treatment, a polyolefin resin film (A) on one side of the layer (B) and a polyamide layer (C) on the other side of the layer (B), wherein the film (A) comprises a layer (A-1) composed of an acid-modified polyethylene resin (alpha) and a layer (A-2) composed of a crystalline polyethylene resin (beta), a temperature at which the acid-modified polyethylene resin (alpha) has a crystallinity of 60%, Tmalpha60, is lower than a temperature at which the crystalline polyethylene resin (beta) has a crystallinity of 60%, Tmbeta60, and the layer (B) is present directly on the layer (A-1). |
