Roll optical film, method for manufacturing roll optical film, polarizing plate and liquid crystal display device

摘要

An object of the present invention is to provide an optical film comprising a cellulose ester film having improved light and dark streaks caused by light omission and die lines when viewed on a liquid crystal display device without using a masking film or a matting agent. It is. A roll-shaped optical film having a length of 500 m or more and 5000 m or less and a width of 1 m or more and 3 m or less, comprising a cellulose ester film having a boiling point of 110 ° C. or less and an organic solvent content of less than 0.01% by mass. The film has 1 to 20 streaks per 10 mm in the width direction, and has a height of 50 nm to 300 nm and a slope of 50 nm / mm to 300 nm / mm. It is characterized by having no streak continuous for 50 cm or more in the longitudinal direction exceeding 300 nm and having an inclination exceeding 300 nm / mm.