| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a cellulose ester resin film with small birefringence by adding orienting optical anisotropy inorganic fine particles to a cellulose ester resin using a melt film-forming method at low cost and with high productivity without reducing the light transmittance of the resin. SOLUTION: According to the manufacturing method of the present invention, the cellulose ester resin film is produced using a melt film-forming method with a rate of 44 to 100 m/min by adding an inorganic particle having negative birefringence to a cellulose ester resin comprising an acetyl group and an acyl group in which a degree of substitution (A) of acetyl group and a degree of substitution (B) of a 3-6C acyl group are expressed by the following formulae. According to a preferred aspect, the variation of an in-plane retardation value (Re) of the above film is within 10% and the variation of a retardation value (Rth) in the thickness direction of the resin film is within 10%. The formulae are 2.0≤A+B≤3.00, 1≤A≤2.0, and 0.5≤B≤3.0. COPYRIGHT: (C)2007,JPO&INPIT
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