| 摘要 |
An optical film according to the present invention comprises a hydrogenated block copolymer [2] that is obtained by hydrogenating 90% or more of unsaturated bonds of a block copolymer [1] that comprises at least two polymer blocks [A] and at least one polymer block [B], the polymer block [A] comprising a repeating unit derived from an aromatic vinyl compound as a main component, the polymer block [B] comprising a repeating unit derived from a linear conjugated diene compound as a main component, a ratio (wA:wB) of a weight fraction wA of the polymer block [A] in the block copolymer [1] to a weight fraction wB of the polymer block [B] in the block copolymer [1] being 40:60 to 80:20, a height from a peak of a ridge of a die line that is formed in a longitudinal direction of the optical film to a bottom point of a valley that is contiguous to the ridge being 100 nm or less over an entire surface of the optical film, and a slope of the die line being 300 nm/mm or less over the entire surface of the optical film. The present invention provides an optical film that has a reduced surface defects. |
