To provide a single or multi layered thermoplastic film having excellent properties as compared with known films with inexpensive material cost.
The method for production of crystalline thermoplastic single or laminated film comprising extrusion or coextrusion process, biaxial drawing process and heat setting process, comprises use of a resin obtained by mixing a first thermoplastic resin which is a main component, and ≤50 wt.% of a second thermoplastic resin before extrusion or coextrusion. The first thermoplastic resin exhibits 600-1000 of standard viscosity at 25°C in dichloroethane, and the second thermoplastic resin exhibits 900-1200 of standard viscosity at 25°C in dichloroethane and the difference of the standard viscosity between the first thermoplastic resin and the second thermoplastic resin at 25°C in dichloroethane is ≥100.
MURSCHALL URSULA
KLIESCH HOLGER
