Stretched film, polarizing stretched film, method for producing the stretched film, and method for producing the polarizing stretched film

摘要

Disclosed are: 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 the base film, wherein the base film has a multilayer structure of resin layers including two resin layers which comprise different resins from one another; a polarizing stretched film obtained by imparting polarizing performance to the stretched film; and a method for producing a polarizing plate using the polarizing stretched film. It is preferable that the resins constituting the above-described two resin layers show different phase transition temperatures from one another.

主权项

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.