Patent ID: 7943716

Claim:
A process for preparing a polymer containing derived units of 1-hexene and 10% to 50% by mol of derived units of propylene or 1-butene, and having an intrinsic viscosity of higher than 1.8 dl/g, the process comprising contacting under polymerization conditions hexene and propylene or 1-butene in the presence of a catalyst system obtained by contacting: a) a metallocene compound of formula (V): wherein: M is an atom of a transition metal selected from those belonging to group 3, 4, or to the lanthanide or actinide groups in the Periodic Table of the Elements; X, same or different, is a hydrogen atom, a halogen atom, or a R, OR, OSO 2 CF 3 , OCOR, SR, NR 2 or PR 2 group, wherein R is a are linear or branched, cyclic or acyclic, C 1 -C 40 -alkyl, C 2 -C 40 alkenyl, C 2 -C 40 alkynyl, C 6 -C 40 -aryl, C 7 -C 40 -alkylaryl or C 7 -C 40 -arylalkyl radicals; optionally containing heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements; or two X can optionally form a substituted or unsubstituted butadienyl radical or a OR′O group wherein R′ is a divalent radical selected from C 1 -C 40 alkylidene, C 6 -C 40 arylidene, C 7 -C 40 alkylarylidene and C 7 -C 40 arylalkylidene radicals; L is a divalent C 1 -C 40 hydrocarbon radical optionally containing heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements or a divalent silylene radical containing up to 5 silicon atom; R 1 is linear or branched, saturated or unsaturated C 1 -C 20 -alkyl radicals, optionally containing heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements; R 2 is a linear or branched, saturated or unsaturated C 1 -C 20 -alkyl radical, optionally containing heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements; R 5 is a hydrogen atom or linear or branched, saturated or unsaturated C 1 -C 20 -alkyl radical, optionally containing heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements; R 14 , equal to or different from each other, are hydrogen atoms or C 1 -C 40 hydrocarbon radicals optionally containing heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements; and (b) an alumoxane or a compound that forms an alkyl metallocene cation.