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US 2006/0216439 A1Published application
Optical film
AssigneeKonica Minolta Opto, Inc.
InventorsKazuyuki Shimizu, Syouichi Sugitani
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Abstract
An optical film comprising a cycloolefin resin or a cellulose ester resin, wherein (a) at least one of edges of the optical film is slit; (b) an average surface roughness Ra specified in JISB0601-2001 of a cross-section of the optical film formed by slitting is 0.05 to 0.9 μm; and (c) a width of the optical film is 1400 mm or more.
Claims9
An optical film comprising a cycloolefin resin or a cellulose ester resin, wherein
- (a) at least one of edges of the optical film is slit;
- (b) an average surface roughness Ra specified in JISB0601-2001 of a cross-section of the optical film formed by slitting is 0.05 to 0.9 μm;
- and
- (c) a width of the optical film after slitting is 1400 mm or more.
1 more element
A method for producing an optical film comprising a cycloolefin resin or a cellulose ester resin comprising the steps of:
- (i) melt casting or solution casting a cycloolefin resin or a cellulose ester resin on a rotary drum support or on a rotary endless belt support to form a cast film;
- (ii) peeling the cast film from the support;
- (iii) slitting at least one of two edges of the cast film;
- and
- (iv) winding the cast film in a roll, wherein
- (a) a width of the cast film after slitting is 1400 mm or more;
- and
- (b) an average surface roughness Ra specified in JISB0601-2001 of a cross-section of the cast film formed by slitting is 0.05 to 0.9 μm.
5 more elements
Dependencies are inferred from the claim text.