Toyo Boseki Kabushiki Kaisha

Shigenori Iwade

Katsuhiko Nose

Naoki Mizuno

Chikao Morishige

Toshitake Suzuki

Yasuhiro Nishino

Hideki Sugihara

The present invention provides a laminated thermoplastic resin film which is excellent in adhesion and blocking resistance. A laminated thermoplastic resin film has a covering layer containing a copolymerized polyester resin and a polyurethane resin on one side or both sides of a thermoplastic resin film, characterized in that the covering layer has a microphase-separated or nanophase-separated structure in polyester (PE) phase A comprising a copolymerized polyester resin as a main component and polyurethane (PU) 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 ration (surface fraction of PEs) of polyester phase A (which indicates a dark phase in phase image) of the surface of the covering layer defined by following the formula (1) is 35% or more and less than 90% per 20 a measurement area of 5 &#x3bc;m&#xd7;5 &#x3bc;m.Surface fraction of PEs (%)=(area of PEs phase A/measurement area)&#xd7;100.&#x2003;&#x2003;(1)

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Otsu, Japan

Shigenori Iwade