Provided are: a retardation-increasing agent that has excellent compatibility and, when incorporated into a resin film, is capable of not only adjusting the thickness-direction phase difference toward a positive direction but also imparting the film with high retardation; a cellulose-based resin composition comprising the retardation-increasing agent; and a film that is obtained from the cellulose-based resin composition and has excellent optical properties. The retardation-increasing agent comprises a compound represented by the following Formula (1) or (2):
(wherein, R1 to R10 each independently represent a hydrogen atom or the like); or
(wherein, R21 to R28 each independently represent a hydrogen atom or the like).
本发明提供了:一种缓凝剂,该缓凝剂具有优异的相容性,当加入到
树脂薄膜中时,不仅能够将厚度方向的相位差向正方向调整,还能赋予薄膜高缓凝性;一种
纤维素基
树脂组合物,该组合物包含该缓凝剂;以及一种薄膜,该薄膜由
纤维素基
树脂组合物制成,具有优异的光学特性。延缓剂包括由下式(1)或(2)表示的化合物:
(其中,R1 至 R10 各自独立地代表氢原子或类似原子);或
(其中,R21 至 R28 各自独立地代表氢原子或类似原子)。