Patent ID: 9151983
Filing Date: 2015-10-06
Classification: B29C,B29D,B29K,B32B,C09K,G02B,G02F,Y10T

Abstract:
1. A stretched film obtained by uniaxially stretching a laminated film which comprises a base film and a polyvinyl alcohol resin layer laminated on one surface of said base film, wherein the base film has a multilayer structure of resin layers including two resin layers which comprise different resins from one another, wherein the resins constituting said two resin layers have different phase transition temperatures from one another, wherein the phase transition temperature means glass transition temperature when the resin constituting the resin layer is an amorphous resin, and wherein phase transition temperature means melting point when the resin is a crystalline resin, wherein the resin layer having lower phase transition temperature is not uniaxially oriented, wherein said base film is the one stretched perpendicular to the stretching direction of said uniaxial stretching within the plane of the film.