Multilayer optical film, method of producing the same and polarizer comprising the same

A method of manufacturing a multilayer optical film, the method comprising:

• co-extruding a first film layer formed of a thermoplastic acrylic resin composition including 0.01 to 2.0 parts by weight of a triazine-based ultraviolet absorber, a second film layer formed of a thermoplastic acrylic resin composition including 0.1 to 5.0 parts by weight of at least one ultraviolet absorber selected from a group consisting of a triazole-based ultraviolet absorber, a benzophenone-based ultraviolet absorber, an oxanilide-based ultraviolet absorber and a cyanoacrylate-based ultraviolet absorber, and a third film layer formed of the thermoplastic acrylic resin composition including 0.01 to 2.0 parts by weight of the triazine-based ultraviolet absorber, with respect to 100 parts by weight of the thermoplastic acrylic resin composition, and
• stretching the co-extruded film,
• wherein in a case that a thickness of the multilayer optical film is 60 μm, the first film layer and the third film layer have a straight light transmittance of 3% to 12%, the second film layer has a straight light transmittance of 0.1% to 7%, and the multilayer optical film has a straight light transmittance of 0.01% to 5%, at a wavelength of 290 nm.