| abstract |
The present invention provides one to have the phase retardation film that high latency expression power, mechanical strength and durability are good.The phase retardation film of the present invention contains the compound shown in cellulose derivative and the following formula of at least one (1).(in formula (1), R 1 And R 2 Separately represent alkyl, cycloalkyl, aryl or heterocyclic radical；X 1 Represent singly-bound, NR 4 , O or S；X 2 Represent singly-bound, NR 5 ‑、‑NR 5 (C=O), O or S；R 4 And R 5 Separately represent hydrogen atom, alkyl, cycloalkyl, aryl or heterocyclic radical；R 3 Represent substituent group；N represents the integer of 0～4；When n is more than 2, multiple R 3 Can be identical, it is also possible to different, adjacent R 3 Can be bonded each other and form ring) formula (1) 。 |