Patent ID: 7531238

Claim:
A laminated thermoplastic resin film comprising a covering layer containing a copolymerized polyester resin and a polyurethane resin on one side or both sides of a thermoplastic resin film, wherein the covering layer has a microphase-separated or nanophase-separated structure in polyester phase A comprising a copolymerized polyester resin as a main component and polyurethane phase B comprising a polyurethane resin as a main component, and when the covering layer is observed by a scanning probe microscopy in phase measurement mode, an area ratio (surface fraction of PEs) of polyester phase A (which indicates a dark phase in phase image) on a surface of the covering layer defined by following formula (1) is 35% or more and less than 90% per a measurement area of 5 μm×5 μm, wherein Surface fraction of PEs (%)=(area of polyester phase A/measurement area) ×100 (1).