Multilayer film

摘要

A multi-layer film having a layer structure that a polyvalent metal compound-containing layer adjoins one side or both sides of a polymer layer containing a carboxyl group-containing polymer and a polyvalent metal salt of the carboxyl group-containing polymer, wherein the polymer layer has a concentration gradient structure that the concentration of the polyvalent metal salt of the carboxyl group-containing polymer in the polymer layer is continuously reduced in the thickness-wise direction from a surface adjoining the polyvalent metal compound-containing layer, and a peak ratio A₁₅₆₀/A₁₇₀₀ as determined on the basis of an infrared absorption spectrum of the polymer layer is at least 0.25.