Retardation film, composition, method of manufacturing retardation film, polarizing plate and liquid crystal display device

A composition comprising a polymer compound, a rod-like liquid crystal compound and a photo-reactive compound, wherein the polymer compound has a side chain which has one or more azo groups and/or cynnamate groups, and 3 or more and 10 or less arylene groups;

• the side chain further has an optionally substituted amino group, or a hydrocarbon group at the terminal;
• and an absolute value of difference between an SP value of the polymer compound and an SP value of the photo-reactive compound is 1.1 or less.

A retardation film comprising a polymer compound and an alignment controlling agent, wherein the polymer compound has a side chain which has one or more azo groups and/or cynnamate groups and 3 or more and 10 or less of arylene group, the side chain further has an optionally substituted amino group, or a hydrocarbon group at the terminal, a content of the polymer compound in the retardation film is 71% by mass or more, and an in-plane retardation of the film at wavelength of 550 nm is 10 nm or more and 200 nm or less.

A composition comprising a polymer compound and an alignment controlling agent, wherein the polymer compound has a side chain which has one or more azo groups and/or cynnamate groups, and 3 or more and 10 or less arylene groups;

• the side chain further has an optionally substituted amino group, or a hydrocarbon group at the terminal;
• and a content of the polymer compound in the composition is 71% by mass or more relative to the total solid content.