Polarizing film, optical film laminate including polarizing film, stretched laminate for use in production of optical film laminate including polarizing film, production methods for them, and organic EL display device having polarizing film

摘要

[Objects] To provide a polarizing film, and an optically film laminate including the polarizing film. [Means for accomplishing the Objects] An optical film laminate comprising:
a substrate comprising a crystallizable ester type thermoplastic resin in the form of a continuous web; and
a polarizing film comprising a polyvinyl alcohol type resin layer formed on the substrate, said polarizing film including a dichroic material impregnated therein in a molecularly oriented state,
wherein the polarizing film is formed by providing a laminate comprising the polyvinyl alcohol type resin layer formed on a substrate comprising a crystallizable ester type thermoplastic resin in an amorphous state and subjecting the laminate to a 2-stage stretching process comprising a preliminary in-air stretching and an in-boric-acid-solution stretching under a temperature maintaining the amorphous state of the substrate, such that the polyvinyl alcohol type resin layer is stretched to a thickness of 10µm or less, 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 a polarization rate, is disclosed.