A thermoplastic resin film and a method for producing the same

摘要

A thermoplastic resin film at least oriented in the transverse direction with minimized bowing phenomenon is provided. The thermal shrinkage stress in the transverse direction of the film satisfies the following formula I, and the thermal shrinkage factor of said film in the transverse direction at a temperature that is 40 DEG C higher than the glass transition temperature of said resin is 5% or less: ( sigma 2/ sigma 1) ) of the film in the transverse direction at a temperature that is 70 DEG C higher than the glass transition temperature of said resin, and sigma 2 is the thermal shrinkage stress (kg/mm<2>) of the said film in the transverse direction at a temperature that is 80 DEG C lower than the melting temperature of said resin.