Semi-crystalline cycloolefin copolymer film

An oriented film having at least one layer comprising a cycloolefin copolymer which includes 0.1 to 99.9% by weight based on the total amount of monomers, of at least one monomer of the formulae I, II, III, IV, V, VI, VII, VIII or IX ##STR11## wherein:

• R.sup.1 to R.sup.8 are the same or different and each represent a hydrogen atom, a C.sub.6 -C.sub.16 -aryl or a C.sub.1 -C.sub.8 -alkyl radical, wherein the various groups in the aforementioned formulae may have he same or a different meaning, and in wherein
• R.sup.9 to R.sup.20 are the same or different and each represent a C.sub.1 -C.sub.16 -alkyl, C.sub.2 -C.sub.16 -alkenyl or C.sub.6 -C.sub.16 -aryl radical, or in wherein the radical pairs R.sup.9 /R.sup.10, R.sup.11 /R.sup.12, R.sup.13 /R.sup.14, R.sup.15 /R.sup.16, R.sup.17 /R.sup.18 and/or R.sup.19 /R.sup.20, together with the carbon atom or atoms to which they are bonded, form a C.sub.4 -C.sub.8 -cycloalkyl radical,
• said cycloolefin copolymer further comprising from 99.9 to 0.1% by weigh, based on the total amount of monomers, of at least one acyclic olefin of the formula X
• H.sub.2 C.dbd.CH--R.sup.21 (X)
• in which R.sup.21 is a hydrogen atom or a C.sub.1 -C.sub.16 -alkyl or C.sub.6 -C.sub.16 -aryl radical, and wherein the cycloolefin copolymer has a catalyst residue content of <100 ppm.