| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a cellulose acylate film controlled in optical anisotropy and the directionality of dynamic physical properties and capable of being directly laminated to a polarizing plate. <P>SOLUTION: The cellulose acylate film is characterized in that its X-ray diffraction intensity satisfies formula (I): 0.60≤Ic<SB>i</SB>/Ic<SB>o</SB>≤100 and the half-width of the peak at 2θ<SB>2</SB>observed from the cross section in the direction parallel to the film transfer direction (wherein Ic<SB>i</SB>is Ic<SB>11</SB>/Ic<SB>12</SB>and Ic<SB>o</SB>is ä(Ic<SB>21</SB>/Ic<SB>22</SB>)+(Ic<SB>31</SB>/Ic<SB>32</SB>)}/2 and Ic<SB>11</SB>-Ic<SB>32</SB>are calculated using formula (II): Iam=I<SB>1</SB>+ä(I<SB>3</SB>-I<SB>1</SB>)/(2θ<SB>3</SB>-2θ<SB>1</SB>)×(2θ<SB>2</SB>-2θ<SB>1</SB>)} and formula (III): (Ic=I<SB>2</SB>-Iam). Ic<SB>11</SB>-Ic<SB>12</SB>are calculated using a diffraction photograph) in a case observed from the direction vertical to the surface of the film to express Ic in an azimuth becoming maximum in I<SB>2</SB>and Ic in the azimuth crossing the maximum azimuth at a right angle. In the same way, Ic<SB>21</SB>-Ic<SB>32</SB>are calculated using the diffraction photograph of the cross section in the direction crossing the cross section in the direction parallel to the feed direction of the film at a right angle. In the formulae (II) and (III), 2θ<SB>1</SB>shows 2θ becoming minimum in intensity between 4 and 5° in 2θ when θ is set to a Bragg angle, 2θ<SB>2</SB>shows 2θ becoming maximum in intensity between 5 and 10° in 2θ and 2θ<SB>3</SB>shows 2θ becoming minimum in intensity between 14 and 16° in 2θ. Further, I<SB>1</SB>, I<SB>2</SB>and I<SB>3</SB>each show a diffraction intensity in 2θ<SB>1</SB>, 2θ<SB>2</SB>and 2θ<SB>3</SB>, respectively. <P>COPYRIGHT: (C)2008,JPO&INPIT |
