Patent ID: 8742042

Claim:
A polymerization process comprising contacting under polymerization conditions ethylene and at least one alpha olefin of formula CH2=CHA, wherein A is a C 2 -C 20 alkyl radical, to obtain a copolymer comprising from 95% by mol to 75% by mol of ethylene derived units in presence of a catalyst system obtained by contacting: a) at least a metallocene compound of formula (I) and b) alumoxane or a compound capable of forming an alkyl metallocene cation; wherein: M is an atom of a transition metal selected from group 3, 4, or the lanthanide or actinide groups in the Periodic Table of Elements; X equal to or different from each other, is hydrogen, halogen, R, OR, OR′O, OSO 2 CF 3 , OCOR, SR, NR 2 or PR 2 ; R is a 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 radical, optionally comprising at least one heteroatom belonging to groups 13-17 of the Periodic Table of Elements; R′ is a C 1 -C 20 -alkylidene, C 6 -C 20 -arylidene, C 7 -C 20 -alkylarylidene, or C 7 -C 20 -arylalkylidene radical; L is a divalent bridging group selected from C 1 -C 20 alkylidene, C 3 -C 20 cycloalkylidene, C 6 -C 20 arylidene, C 7 -C 20 alkylarylidene, or C 7 -C 20 arylalkylidene radicals, optionally comprising at least one heteroatom belonging to groups 13-17 of the Periodic Table of Elements, or a silylidene radical comprising up to 5 silicon atoms; R 1 is a linear C 1 -C 40 hydrocarbon radical optionally comprising at least one heteroatom belonging to groups 13-17 of the Periodic Table of Elements; R 2 and R 3 are part of 4-7 membered ring condensed to the benzene ring of the indenyl moiety, the ring optionally comprising at least one heteroatom belonging to groups 13-16 of the Periodic Table of Elements, wherein the valence of each atom forming the ring being filled with R 18 radicals; R 18 equal to or different from each other, are hydrogen or C 1 -C 40 hydrocarbon radicals; R 4 is hydrogen; W is an aromatic 5 or 6 membered ring optionally comprising at least one heteroatom belonging to groups 13-16 of the Periodic Table of Elements, wherein the valence of each atom of the ring is substituted with hydrogen or is optionally substituted with at least one R 5 group; and R 5 equal to or different from each other, are C 1 -C 40 hydrocarbon radicals optionally comprising at least one heteroatom belonging to groups 13-17 of the Periodic Table of Elements.