| 摘要 |
PROBLEM TO BE SOLVED: To provide a cellulose acylate film that substantially prevents generation of foreign substances, reduces the number of bright spots, shows little changes in a film thickness with time in a moisture and heat environment, and has excellent durability, a polarizing plate protective film, and a polarizing plate and a liquid crystal display device using the polarizing plate protective film.SOLUTION: The cellulose acylate film comprises: a chelating agent A having at least one functional group that shows an acid dissociation constant pKa of 6 or less measured at 25°C in a mixture solvent with a mixing ratio of 60 ml of tetrahydrofuran to 40 ml of water; a chelating agent B having at least one functional group that shows, in a form of a conjugate acid, an acid dissociation constant pKa of 7 or more measured under the same conditions as above described; and cellulose acylate. The film shows an internal haze of 0.10% or less. The polarizing plate protective film, and the polarizing plate and the liquid crystal display device using the polarizing plate protective film are provided. |
