| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cellulose acylate dope which seldom produces an optical irregularity or a heat shrinkage irregularity on a film product and a cellulose acylate film. <P>SOLUTION: The cellulose acylate dope has a diffraction peak (A) having a half amplitude level of 0.1 to 2 degrees in the range of 20 to 25 degrees of 2θ on observing an X ray diffraction under cooling at -50°C . The cellulose acylate dope has an absorbance at 550 nm at -50°C higher by ≥0.01 and ≤3 than the minimum absorbance (Am) at 550 nm between -40°C from 0°C, and the cellulose acylate dope has a temperature at which tan δ(the value of G"(Viscous Modulus) divided by G' (an elastic modulus)) measured in a closed system being less than 1 being higher than -80°C and below 15°C. The cellulose acylate dope has at least two peaks in a distribution curve of a diffusion coefficient at -50°C and an absolute value(Δlog D) of a difference between naturalized logarithms of each diffusion coefficient at the highest peak and the second high peak of ≥0.5 and ≤8, and a cellulose acylate film made by using the same is disclosed. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
