Sandwich laminate, sandwich structure and unified molded product using same and processes for producing both

Abstract

A sandwich laminate, includes as a layer forming a core, a sheet-form intermediate substrate obtained by impregnating a mat composed of reinforcement fibers with a thermoplastic resin; and, as layers forming a skin, sheet-form intermediate substrates obtained by impregnating a mat composed of reinforcement fibers or continuous reinforcement fibers with a thermoplastic resin, wherein at least the sheet-form intermediate substrate used as the layer forming a core has a thermal expansibility, the usable temperature region of a thermoplastic resin (A) constituting the layers forming a skin and that of a thermoplastic resin (B) constituting the layer forming a core overlap each other over a temperature range of at least 5° C., and the thermoplastic resin (A) has a temperature region where it does not melt at a lower limit of the usable temperature region of the thermoplastic resin (B).