Patent ID: 8771454

Claim:
A method for manufacturing an optical film laminate in which a polarizing film made of a polyvinyl alcohol type resin having a dichroic material impregnated therein in a molecularly oriented state is formed on a substrate made of a crystallizable ester type thermoplastic resin in the form of a continuous web, comprising steps of: forming a stretched laminate comprising a stretched intermediate made of a molecularly oriented polyvinyl alcohol type resin by subjecting a laminate comprising a substrate made of a crystallizable ester type thermoplastic resin in an amorphous state and a polyvinyl alcohol type resin layer formed on the substrate to a preliminary in-air stretching under a temperature in which the amorphous state of the substrate can be maintained; forming a dyed laminate including a dyed intermediate comprising the polyvinyl alcohol type resin layer having a dichroic material impregnated therein in a molecularly oriented state by impregnating the dichroic material in the stretched laminate; and forming the optical film laminate including a polarizing film which is made of the polyvinyl alcohol type resin having the dichroic material impregnated therein in a molecularly oriented state and has a thickness of 10 μm or less, by stretching the dyed laminate in a boric acid solution, wherein the polarizing film having optical properties which satisfy conditions represented by the formulae: P>− (10 0.929T−42.4 −1)×100 (where T <42.3); and P≧ 99.9 (where T≧ 42.3), where T represents a single layer transmittance, and P represents a polarization rate.