prov:value
| - In the polymerization reaction, at least one symmetrical polycyclic olefin of the formula I, II, III, IV, V or VI, preferably a symmetrical polycyclic olefin of the formula I or III in which R1, R2, R3, R4, R5, R6, R7 and R8 are identical or different and are a hydrogen atom or a C1-C8-alkyl radical, is polymerized.
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