Toray Industries, Inc.

Wataru Goda

Takayuki Uto

Yoshihiro Masuda

Syunichi Osada

Yuji Matsuo

Kazuyoshi Ota

[Problem] Provided is a laminated film which exhibits good general adhesiveness to PVAs, EVAs and PVBs having a wide range of saponification degrees as well as good moist heat-resistant adhesiveness. [Means for Solution] The laminated film comprises a resin layer (&#x3b1;) composed of an aliphatic urethane structure-containing resin composition (I) on at least one side of a thermoplastic resin film, the resin layer (&#x3b1;) satisfying the following properties (i) and (ii): (i) the resin layer (&#x3b1;) has a surface free energy (sum of the dispersion force and the polar force) of not less than 30 mN/m and not greater than 45 mN/m; and (ii) the resin layer (&#x3b1;) has a polar force of not less than 5.0 mN/m and not greater than 15.0 mN/m.

Laminated film

A multi-layer laminated film includes layers composed using a thermoplastic resin A and layers composed using a thermoplastic resin B, which A layers and B layers are alternately laminated in 51 or more layers, wherein the film has: a heat shrinkage stress of 0.5 MPa to 5 MPa at 150&#xb0; C. in the longitudinal and width directions of the film; and a heat shrinkage stress kick-off temperature of 110&#xb0; C. or lower in at least one of the longitudinal and width directions of the film.

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Otsu, Japan

Wataru Goda