. . . . "A film as claimed in claim 12, wherein the cycloolefin polymer COP2 comprises from 0.1 to 100% by weight based in each case on the total weight of the cycloolefin polymer, of polymerized cycloolefin units of the formulae I, II, III, IV, V or VI ##STR10## where R1, R2, R3, R4, R5, R6, R7 and R8 are identical or different and are a hydrogen atom or a C1 -C30 -hydrocarbon radical or where two or more" . . . . .