Abstract: The resin composition of the present disclosure contains a fluorene derivative represented by the following formula (1) and a polyamide-series resin: Wherein R1 represents a substituent, k denotes an integer of 0 to 8, R2a, R2b, R2c, and R2d each represent a hydrogen atom or a substituent, R3a and R3b each represent a hydrogen atom or a substituent, and X1a and X1b each represent a group defined in the following formula (X1): wherein R4 and R5 each represent a hydrogen atom or a hydrocarbon group; or R4 and R5 bend together to form a heterocyclic ring containing the nitrogen atom adjacent to R4 and R5. The resin composition has an excellent fluidity.

Abstract: A retardation film includes a polyester-series resin exhibiting a negative orientation birefringence and a forward wavelength dispersibility in retardation in combination with a polyamide-series resin exhibiting a positive orientation birefringence and a flat dispersibility in retardation. The polyester-series resin may contain a constitutional unit having a fluorene-9,9-diyl group, and the polyamide-series resin may contain a constitutional unit having an alicyclic skeleton. The polyester-series resin may contain at least one constitutional unit selected from a fluorenedicarboxylic acid unit (A1) containing a unit of the formula (1) and a fluorenediol unit (B1) containing a unit of the formula (2): wherein R1 and R2 each represent a substituent; k and m each denote an integer of 0 to 8; X1a, X1b, X2a, and X2b each represent a hydrocarbon group; A1a and A1b each represent an alkylene group; n1 and n2 each denote an integer of not less than 0.