prov:value
| - In particular, propylene end ethylene are polymerized or copolymerized or a cycloolefin polymer is prepared, wherein 0.1 to 100% by weight, with respect to the total amount of monomers employed, of at least one monomer of the formulae I, II, III, IV, V or VI ##STR15## 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, it being
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