Retardation film and method for production thereof

Details Retardation film and method for production thereof Retardation film and method for production thereof

2007-03-23

2010-06-29

Teskin, Fred M (Department: 1796)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

C526S348100, C526S351000, C264S001340, C264S290200, C264S901000, C349S117000

Reexamination Certificate

active

07744969

ABSTRACT:
The present invention provides a method for producing a retardation film of a polypropylene resin, the method comprising subjecting a film of a polypropylene resin to longitudinal stretching and transverse stretching which are performed sequentially, wherein the transverse stretching comprises the following steps, and a polypropylene resin retardation film which is obtained by such a method and has both a high axial retardation and a uniform retardation:a step of preheating the film at a preheating temperature which is equal to or higher than the melting point of the polypropylene resin;a step of stretching the preheated film in the transverse direction at a stretching temperature which is lower than the preheating temperature; anda step of heat setting the film stretched in the transverse direction.

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