| 摘要 |
The invention provides a ring-opened polynorbornene that is relatively low in birefringence, has specific wavelength dependency about birefringence and is excellent in transparency and heat resistance. ÄSolving meansÜ The polymer of the present invention has a structural unit (I) of the general formula (I): ÄChemical formula 1Ü <CHEM> wherein in the general formula (I), m and n are integers of 0 to 2, X<1> is an ethylene or vinylene group, R<1> and R<2> are individually a hydrogen atom or a substituted or unsubstituted hydrocarbon group having 1 to 30 carbon atoms, and R3 is a group of the general formula (I-1) or (I-2), in which in the general formulae (I-1) and (I-2), R<11> to R<27> are individually a hydrogen atom; a halogen atom; a substituted or unsubstituted hydrocarbon group having 1 to 30 carbon atoms, which may have a linkage containing or not containing oxygen, sulfur, nitrogen and/or silicon atom(s); or a polar group, p and q in the general formula (I-1) are individually 0 or a positive integer, with the proviso that when both p and q are 0, R<12> and R<15>, or R<19> and R<15> may be bonded to each other to form a carbon ring or heterocyclic ring, and the carbon ring or heterocyclic ring may be either a monocyclic structure or a polycyclic structure, and s in the general formula (I-2) is 0 or a positive integer. <IMAGE>
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