| 摘要 |
Disclosed is an optical film produced by a method comprising continuously discharging a molten resin on a casting roll through a die lip of an extruder, wherein the molten resin contains a copolymer of (A) 75 to 99% by weight of an (meth)acrylate monomer that, when homopolymerized, has a negative intrinsic birefringence, and (B) 1 to 25% by weight of an (meth)acrylate monomer that, when homopolymerized, has a positive intrinsic birefringence, and a velocity ratio V 2 /V 1 of 1.2 to 15 is satisfied wherein V 1 represents a discharge velocity of the molten resin from the die lip, m/min; and V 2 represents a surface velocity of the casting roll, m/min. |
