Toyo Kohan Co., Ltd.

Yoshimi Itoh

Norimasa Maida

Toshiyuki Ueda

Masashi Ikebuchi

Kenjirou Tanaka

A resin film for laminating a metal plate including a resin composition including a polyester-based thermoplastic elastomer and a thermoplastic polyester having a glass transition temperature (Tg) of 70° C. or more and 90° C. or less. The thermoplastic elastomer is dispersed in the thermoplastic polyester. A content of the thermoplastic elastomer in the film is 2 to 50 wt %, and an absolute value ΔTg of a difference between a glass transition temperature of the thermoplastic polyester and a glass transition temperature of the film satisfies the following Expression (1):ΔTg<0.5×W (1)wherein W represents the thermoplastic elastomer content (wt %) in the film.

Resin film for laminating metal plate and laminated metal plate using the same

A method of producing a stretched film comprising melt-coextruding a thermoplastic resin A and a thermoplastic resin B to produce a composite filmhaving both-end filmsof the thermoplastic resin B arranged in parallel at both end portions of the main filmof the thermoplastic resin A in the direction of width thereof, stretching the composite film, and cutting and removing both end portions of the stretched film in the direction of width, wherein a film stretch stress value of the both-end filmsis larger than a film stretch stress value of the main filmat the same stretching ratio. This minimizes an increase in the thickness at both end portions of the film in stretching the film and decreases the widths by which both end portions of the expensive resin film are to be cut and removed for producing a film.

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Kudamatsu, Japan

Yoshimi Itoh