Optical film, polarizing plate and display device utilising the film, and production method of optical film
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United States of America Patent
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Aug 5, 2008
Grant Date -
Mar 23, 2006
app pub date -
Sep 28, 2005
filing date -
Feb 26, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical film is disclosed having minimal curl, minimal coating unevenness and no cracks. The optical film is obtained by casting a dope comprising a cellulose ester and a non-chlorinated solvent on a metal support, the cellulose ester having a total acyl substitution degree of 2.6 to 2.85 and having a ratio of a weight-average molecular weight to a number-average molecular weight of 1:1 to 3:1; drying the cast dope on the metal support so as to obtain a cellulose ester film; peeling the cellulose ester film from the metal support; further drying the cellulose ester film while providing a longitudinal stretch or a lateral stretch to the cellulose ester film; and providing a metal oxide layer on the cellulose ester film.
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