| 摘要 |
PROBLEM TO BE SOLVED: To provide a retardation film for extending a film making a principal component of a ring-like olefin-based additional copolymer exhibiting characteristics such as melting molding working, excellent transparency, heat resistance, low water absorption and a low dielectric constant. SOLUTION: The retardation film has: a structural unit (1) induced from a ring-like olefin-based compound having 4C alkyl group; and a structural unit (2) induced from a ring-like olefin-based compound having 5-12C alkyl group. The retardation film extends the film consisting of a ring-like olefin-based compound additional copolymer having a structural unit (3) induced from the other ring-like olefin-based compound at need. The retardation film consisting of the ring-like olefin-based additional copolymer has excellent transparency, heat resistance, low water absorption, dielectric constant, a small metal constant, excellent flexibility and toughness. The retardation film has high uniformity of retardation in the face of the film, hardly influences temperature and humidity of an environment by obtained retardation properties, has excellent elapse stability and excellent expression of the retardation. COPYRIGHT: (C)2008,JPO&INPIT |
