| 摘要 |
A thermoplastic norbornene resin which displays a high degree of toughness, and for which the exhibited retardation and the wavelength dependency of that retardation can be controlled is provided, which is formed from a copolymer with a structural unit represented by a general formula (1) and a structural unit represented by a general formula (2). [wherein, m is an integer of 1 or greater, p is either 0, or an integer of 1 or greater, each X and each Y represents, independently, either -CH=CH- or -CH2CH2-, and R<1 >to R<8 >each represent, independently, a hydrogen atom, a halogen atom or a hydrocarbon group or the like.]
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