Lowe Hauptman & Ham, LLP
Polarizing film, optical film laminate including polarizing film, and method for manufacturing the same
An optical film laminate includes a substrate including a crystallizable ester type thermoplastic resin in the form of a continuous web; and a polarizing film including 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 including the polyvinyl alcohol type resin layer formed on a substrate including a crystallizable ester type thermoplastic resin in an amorphous state and subjecting the laminate to a 2-stage stretching process including 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 10 μm or less, the polarizing film having optical properties based on the formulae P>−(100.929T−42.4−1) ×100 (where T<42.3) and P≧99.9 (where T≧42.3).
Nitto Denko Corporation
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Shusaku Takashi Takeharu Minoru Tomohiro
Goto Kamijo Kitagawa Miyatake Mori