Cycloolefin polymers

A process for preparing a cycloolefin polymer having a solution viscosity >0.25 ml/g (at 135.degree. C. in decalin in accordance with DIN 53 728) and comprising 0.1-100% by weight, based on the total mass of the cycloolefin polymer of polymerized units of at least one polycyclic olefin of the formulae II, III, IV, V, VI or VII:

• ##STR8## wherein R.sup.4, R.sup.5, R.sup.6, R.sup.7, R.sup.8, R.sup.9, R.sup.10 and R.sup.11 are identical or different and are each a hydrogen atom or a C.sub.1 -C.sub.30 -hydrocarbon radical or two or more radicals R.sup.4 to R.sup.11 are joined cyclically, with identical radicals in the various formulae being able to have a different meaning, from 0 to 45% by weight, based on the total mass of the cycloolefin polymer, of polymerized units of at least one monocyclic olefin of the formula VIII ##STR9## where n is a number from 2 to 10, from 5 to 80% by weight, based on the total mass or the cycloolefin polymer, of polymerized units of an acyclic olefin of the formula IX ##STR10## where R.sup.12, R.sup.13, R.sup.14, R.sup.15 are identical or different and are each a hydrogen atom or a C.sub.1 -C.sub.8 -alkyl or a C.sub.6 -C.sub.8 alkyl or a C.sub.6 -C.sub.14 aryl, wherein the cycloolefin polymer has at one or both ends an olefinically unsaturated group having at least three carbon atoms and wherein the olefinically unsaturated group is produced from an olefin that is different from the cycloolefins of the formulae II-VIII and the acyclic olefins of the formula IX and has the formula I ##STR11## where any of R.sup.1, R.sup.2, R.sup.3 can be a hydrogen, except that each of R.sup.1, R.sup.2, R.sup.3 cannot simultaneously be hydrogen, or R.sup.1, R.sup.2, R.sup.3 are identical or different and are each a C.sub.1 -C.sub.16 -alkyl, a C.sub.1 -C.sub.16 -aryl, a C.sub.1 -C.sub.16 -alkenyl, a C.sub.1 -C.sub.16 -haloalkyl or a C.sub.1 -C.sub.16 -haloaryl, which comprises reacting in the presence of a metallocene-aluminoxane catalyst a first olefinic reactant comprised of one or more cycloolefins of the formulae II, III, IV, V, VI or VII ##STR12## wherein R.sup.4, R.sup.5, R.sup.6, R.sup.7, R.sup.8, R.sup.9, R.sup.10 and R.sup.11 are identical or different and are each a hydrogen atom or a C.sub.1 -C.sub.30 -hydrocarbon radical or two or more radicals R.sup.4 to R.sup.11 are joined cyclically, with identical radicals in the various formulae being able to have a different meaning, with less than 25 mole % based on the total amount of monomers, of a second olefinic reactant comprised of a cyclic olefin of the formula VIII ##STR13## wherein n is a number from 2 to 10, or an acyclic olefin having at least three carbon atoms of the formula IX ##STR14## where R.sup.12, R.sub.13, R.sup.14, R.sup.15 are identical or different and are each a hydrogen atom or a C.sub.1 -C.sub.8 -alkyl or a C.sub.6 -C.sub.8 alkyl or a C.sub.6 -C.sub.14 aryl, wherein the cycloolefin polymer has at one or both ends an olefinically unsaturated group having at least three carbon atoms and wherein the olefinically unsaturated group is produced from an olefin that is different from the cycloolefins of the formulae II-VIII and the acyclic olefins of the formula IX and has the formula I ##STR15## where any of R.sup.1, R.sup.2, R.sup.3 can be a hydrogen, except that each of R.sup.1, R.sup.2, R.sup.3 cannot simultaneously be hydrogen, or R.sup.1, R.sup.2, R.sup.3 are identical or different and are each a C.sub.1 -C.sub.16 -alkyl, a C.sub.1 -C.sub.16 -aryl, a C.sub.1 -C.sub.16 -alkenyl, a C.sub.1 -C.sub.16 -haloalkyl or a C.sub.1 -C.sub.16 -haloaryl, wherein when the second olefinic reactant is a cycloolefin, the first and second reactants are different cycloolefins.