| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical compensating sheet using lower fatty acid ester film of cellulose high in retardation value, by using a compound having a triphenylene ring as a retardation-raising agent for lower fatty acid ester film of cellulose. SOLUTION: A compound having a triphenylene ring has a function for raising retardation of a lower fatty acid ester film of cellulose. When 0.01 to 20 pts.wt. compound having the triphenylene ring is added to 100 pts.wt. lower fatty acid ester of cellulose, the lower fatty acid ester film of cellulose with 70-400 nm retardation value in the thickness direction at 550 nm wavelength is provided. The compound having the triphenylene ring is preferably a compound represented by the formula. In the formula, R1-R6 are each independently a hydrogen atom, halogen atom, nitro, sulfo, aliphatic group, aromatic group, or heterocyclic group. |
