Process for the preparation of chemically homogeneous cycloolefin copolymers

Claim 1

A process for the preparation of a cycloolefin copolymer by polymerization of from 0.1 to 99.9% by weight, based on the total amount of the monomers, of at least one monomer of the formula I, II, III, IV, V or VI ##STR14## in which R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 are identical or different and are a hydrogen atom or a C 6 -C 16 -aryl or C 1 -C 8 -alkyl radical, it being possible for identical radicals in the different formulae to have different meanings, from 0 to 99.9% by weight, based on the total amount of the monomers, of a cycloolefin of the formula VII ##STR15## in which n is a number from 2 to 10, and from 0 to 99.9% by weight, based on the total amount of the monomers, of at least one acyclic olefin of the formula VIII ##STR16## in which R 9 , R 10 , R 11 and R 12 are identical or different and are a hydrogen atom or a C 1 -C 8 -alkyl radical, at temperatures of from -78° to 150° C. and at a pressure of from 0.01 to 64 bar, in the presence of a catalyst which comprises an aluminoxane of the formula IX ##STR17## for the linear type and/or formula X ##STR18## for the cyclic type, where, in the formulae IX and X, the radicals R 13 are identical or different and are a C 1 -C 6 -alkyl group or phenyl or benzyl, and n is an integer from 0 to 50, and a metallocene of the formula XI ##STR19## in which M 1 is titanium, zirconium, hafnium, R 14 and R 15 are identical or different and are a hydrogen atom, a halogen atom, a C 1 -C 10 -alkyl group, a C 1 -C 10 -alkoxy group, a C 6 -C 10 -aryl group, a C 6 -C 10 -aryloxy group, a C 2 -C 10 -alkenyl group, a C 7 -C 40 -arylalkyl group, a C 7 -C 40 -alkylaryl group or a C 8 -C 40 -arylalkenyl group, R 16 and R 17 are identical or different and are a mononuclear or polynuclear hydrocarbon radical which is able to form a sandwich structure together with the central atom M 1 , R 18 is ##STR20## ═BR 19 , ═AlR 19 , --Ge--, --Sn--, --O--, --S--, ═SO, ═SO 2 , ═NR 19 , ═CO, ═PR 19 or ═P(O)R 19 where R 19 , R 20 and R 21 are identical or different and are a hydrogen atom, a halogen atom, a C 1 -C 10 -alkyl group, a C 1 -C 10 -fluoroalkyl group, a C 6 -C 10 -fluoroaryl group, a C 6 -C 10 -aryl group, a C 1 -C 10 -alkoxy group, a C 2 -C 10 -alkenyl group, a C 7 -C 40 -arylalkyl group, a C 8 -C 40 -arylalkenyl group or a C 7 -C 40 -alkylaryl group, or R 19 and R 20 or R 19 and R 21 in each case with the atoms connecting them, form a ring, and M 2 is silicon, germanium or tin, wherein the part of the metallocene molecule formed by M 1 and the substituents R 16 -R 17 has C 1 symmetry or, if R 16 and R 17 are identical, is in the meso-form.