Patent ID: 8906279

Claim:
A method for producing a polarizing plate protective film through film formation by melt casting, the method comprising the steps of: extruding a melted film making composition through a casting die at a draw ratio of 10 to 30 during film formation by melt casting to form the polarizing plate protective film; and conveying the formed polarizing plate protective film while holding and pressing between a touch roller having an elastic surface and a cooling roller, wherein the melted film making composition comprises: a cellulose ester resin; and a compound represented by the following Formula (II): wherein R 31 to R 35 each are independently a hydrogen atom or an alkyl group with 1 to 10 carbon atoms; and R 36 is a hydrogen atom or a methyl group, and wherein said cellulose ester resin simultaneously satisfies the following Schemes (1) and (2): 2.6≦ X+Y≦ 3.0 Scheme (1): 0.0≦ X≦ 2.5, Scheme (2): wherein X represents the substitution degree of an acetyl group, while Y represents the substitution degree of a propionyl group or a butyryl group.