Patent ID: 7876502
Filing Date: 2011-01-25
Classification: B29C,B29K,B32B,C08J,G02B,G02F

Abstract:
1. An optical film comprising a transparent polymer film, wherein the optical film is produced by stretching the transparent polymer film at a temperature of (Tg+25° C.) to (Tg+100° C.), Tg being a glass transition point of a polymer of the transparent polymer film, and the optical film has an A 1 value defined by equation (1) of 0.10 to 0.95 and an A 2 value defined by equation (2) of 1.01 to 1.50: wherein Re (λ) represents a retardation value of the optical film with respect to light having a wavelength of λ nm, wherein the transparent polymer film comprises a compound in an amount of 0.01 to 30% by weight, the compound having a maximum absorption wavelength λ max shorter than 250 nm in an ultraviolet absorption spectrum of a solution of the compound.