Optical film, polarizing plate and display device utilising...

Details Optical film, polarizing plate and display device utilising... Optical film, polarizing plate and display device utilising...

2005-09-28

2008-08-05

Bashore, Alain L. (Department: 1792)

Coating processes

Optical element produced

C427S163100, C427S164000, C427S171000, C427S172000, C427S173000, C427S576000, C427S585000, C427S255310, C427S255500, C427S279000, C427S384000, C427S385500, C427S415000, C359S483010, C359S485050, C359S493010, C359S506000, C264S001310, C264S001340

Reexamination Certificate

active

07407686

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.

REFERENCES:
patent: 5705632 (1998-01-01), Shimoda et al.
patent: 5753140 (1998-05-01), Shigemura
patent: 5909314 (1999-06-01), Oka et al.
patent: 6008940 (1999-12-01), Michihata et al.
patent: 2002/0034013 (2002-03-01), Nakamura et al.
patent: 04-152125 (1992-05-01), None
patent: 11-48271 (1999-02-01), None
patent: 2001-226495 (2001-08-01), None

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