Laminated resin

A resin laminate having an at least two-layer structure,

• which comprises a layer (A) formed by melt extrusion of a polyamide-based resin and a layer (B) formed by melt extrusion of a fluorine-containing ethylenic polymer and laminated to said layer (A),
• said layer (A) being one formed by melt extrusion of a polyamide-based resin having an amine value of 10 to 60 equivalents/106 g,
• said layer (B) being one formed by melt extrusion of a fluorine-containing ethylenic polymer having carbonate groups and/or carbonyl halide groups in a total amount of 3 to 1,000 groups per 1×106 main chain carbon atoms and having a melting point of 160 to 270° C.

A production method of a multilayer molded article having an at least two-layer structure comprising a layer (A) formed by melt extrusion of a polyamide-based resin having an amine value of 10 to 60 equivalents/106 g and a layer (B) formed by melt extrusion of a fluorine-containing ethylenic polymer having 3 to 1,000 carbonyl groups, in total, per 1×106 main chain carbon atoms and laminated to said layer (A),

• which method comprises molding a resin laminate having said layer (A) and said layer (B) by melt extrusion to form a multilayer molding and subjecting the thus-formed multilayer molding to 0.01 to 10 hours of heat treatment at a temperature lower than the lowest melting point among the melting points of the resins constituting said molding to obtain the multilayer molded article.