Method for Producing Cellulose Acylate Film and Cellulose Acylate Pellet
AssigneeFuji Photo Film Co., Ltd.
InventorsKiyokazu Hashimoto, Masaaki Otoshi
Life of this patent
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Abstract
Provided is a cellulose acylate film formed through melt casting that is capable of being built in liquid-crystal display devices to solve the display trouble at the time of black level of display. That is a cellulose acylate film formed through melt casting, in which the number of polarizing minor impurities is from 0 to 10/mm2 and the number of black impurities is from 0 to 10/mm2, and which has a transmittance at 450 nm (T450) of from 90 to 100%.
Claims20
A cellulose acylate film formed through melt casting, in which the number of polarizing minor impurities is from 0 to 10/mm2 and the number of black impurities is from 0 to 10/mm2, and which has a transmittance at 450 nm (T450) of from 90 to 100%.
A method for producing cellulose acylate pellets, which comprises kneading and melting a cellulose acylate-containing composition in a kneading extruder, at from 150 to 220° C., at a screw revolution of from 100 to 800 rpm, for a residence time of from 5 seconds to 3 minutes.
Cellulose acylate pellets which satisfy all the requirements of the following formulae (1) to (3) and in which the number of polarizing minor impurities is from 0 to 100/mm3:
- 2.6≦X+Y<3.0, (1)
- 0≦X≦1.8, (2)
- 1.0≦Y<3;
- (3)
- wherein, in the above formulae (1) to (3), X means a substitution degree for an acetyl group;
- Y means a total substitution degree for a propionyl group, a butyryl group, a pentanoyl group and a hexanoyl group.
Dependencies are inferred from the claim text.