| 摘要 |
A cyclic olefin ring-opened copolymer comprising an essential constitutional unit (1) represented by the formula (1) and at least two other specific constitutional units.(1) It becomes possible to provide a novel norbornene ring-opened copolymer which has excellent heat resistance, processability and transparency, can be suitably used in various types of optical films and, when formed into a retardation film, can control the level of birefringence (phase difference) and wavelength dependency, an optical member, a film or a stretched film formed from the copolymer, and a polarizing plate or a liquid crystal display system using the stretched film.
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