| 摘要 |
PROBLEM TO BE SOLVED: To provide technology of avoiding curls generating in a layer configuration with an asymmetric structure of a laminate when the laminate is molded by a coextrusion molding flat-die method.SOLUTION: An unstretched laminate with an asymmetric structure is provided, which is produced by laminating four or more layers, each comprising a composition containing a thermoplastic resin and an additive, by a flat-die coextrusion molding method. In the four or more layers, at least two layers are, each of them, layers (A layers) having a crystallization heat quantity of less than 15 J/g; and at least one layer (A1 layer) of the A layers comprises a single layer or two or more of the A layers laminated and is laminated adjoining to and between two layers (a B1 layer and a B2 layer) which are layers (B layers) having a crystallization heat quantity of 15 J/g or more. The relationship in the B1 layer and the B2 layer, and the A1 layer adjoining to each of them satisfies a specified conditional formula. |
