METHOD FOR PRODUCTION OF SINGLE LAYERED FILM OR LAMINATED FILM COMPRISING CRYSTALLINE THERMOPLASTIC RESIN

摘要

PROBLEM TO BE SOLVED: To provide a single or multi layered thermoplastic film having excellent properties as compared with known films with inexpensive material cost. SOLUTION: 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. COPYRIGHT: (C)2004,JPO