Patent ID: 8017199

Claim:
A cellulose acylate film comprising: a cellulose acylate; at least one first retardation raising agent in an amount of from 0.1 to 30 mass % based on the cellulose acylate; and at least one second retardation raising agent in an amount of from 0.1 to 30 mass % based on the cellulose acylate, wherein the at least one first retardation raising agent has a rod-like polarizability anisotropy represented by expression (1) of from 300×10 −25 cm 3 to 2,000×10 −25 cm 3 , and a distance between terminals of a molecule of from 2 to 10 nm; and the at least one second retardation raising agent has a plane polarizability anisotropy represented by expression (2) of from 300×10 −25 cm 3 to 1,500×10 −25 cm 3 , and a distance between terminals of a molecule of from 2 to 10 nm: Δα=α−(α y+αz )/2 Expression (1): Δα=(α x+αy )/2 −αz Expression (2): wherein αx is the largest constituent of characteristic values obtained after a polarizability tensor is made diagonal; αy is the constituent next to the largest constituent of characteristic values obtained after a polarizability tensor is made diagonal; and αz is the smallest constituent of characteristic values obtained after a polarizability tensor is made diagonal, wherein the at least one first retardation raising agent having a rod-like polarizability anisotropy represented by expression (1) of from 300×10 −25 cm 3 to 2,000×10 −25 cm 3 and a distance between terminals of a molecule of from 2 to 10 nm is a compound represented by formula (1): Ar 1 -L 1 -X-L 2 -Ar 2 Formula (1): wherein Ar 1 and Ar 2 each independently represents an aryl group or an aromatic heterocyclic ring; L 1 and L 2 each independently represents —C(═O)O— or —C(═O)NR— where R represents a hydrogen atom or an alkyl group; and X represents formula (2) or (3): wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 each independently represents a hydrogen atom or a substituent; and wherein R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 and R 18 each independently represents a hydrogen atom or a substituent.