Patent ID: 8629226
Filing Date: 2014-01-14
Classification: C08G,C08J,C09K,G02B,G02F,H01L

Abstract:
1. A retardation film, formed by stretching a film comprising a norbornene-based ring-opening copolymer containing a structural unit (A) represented by the following general formula (1): wherein in the formula (1), n represents an integer of any one of 0 and 1, R X a and b each independently represent an integer of 0 to 6, each Y, which may be the same or different when provided in plurality in a single structural unit, represents a group selected from the group consisting of a methylene group, a carbonyl group, an oxy group, and alkylimino groups having 1 to 5 carbon atoms, and each Z, which may be the same or different when provided in plurality in a single structural unit, represents a group selected from the group consisting of a methylene group, a carbonyl group, an oxy group, and alkylimino groups having 1 to 5 carbon atoms, and a structural unit (B) represented by the following general formula (2): wherein in the formula (2), m represents an integer of any one of 0 and 1, X R two or more of R R a content of the structural unit (A) is not less than 5 mol % but not more than 95 mol % relative to a total amount of the structural units (A) and (B), wherein the content of the structural unit (A) is more than 50 mol % but not more than 95 mol % relative to the total amount of the structural units (A) and (B), and the retardation film is a negative A retardation film.