BIAXIALLY ORIENTED THERMOPLASTIC RESIN FILM

摘要

PURPOSE:To improve sticking resistance and scratch resistance by forming a laminated film wherein the relation between a particle size and film thickness and characteristic values such as the content of particles, film thickness or the like are set to a specific range using a particle-containing thermoplastic resin. CONSTITUTION:A film A having thickness of 0.005-3mum based on a particle- containing thermoplastic resin A is laminated to at least the single surface of a film B based on a thermoplastic resin B to form a laminated film. The mean particle size of particles is set to 0.2-5 times the thickness of the film A and the particle content of the film A is set to 0.1-20wt.% and the sum of the Young module in the longitudinal and lateral directions of said film is set to 1100 kg/mm<2> or more and the coefficient of thermal expansion of the film in the longitudinal direction thereof is set to -1X10<-6>/ deg.C or more to obtain a biaxially oriented thermoplastic resin film. As the particles in the thermoplastic resin A, substantially spherical silica particles due to colloidal silica or particles due to a crosslinked polymer (e.g. crosslinked polystyrene) are preferable.