Patent ID: 7166683

Claim:
A process for polyrnerizing 1-butene comprising contacting under polymerization conditions (i) 1-butene, optionally from 0 to 30% by mole of ethylene, propylene or an alpha olef in of formula CH 2 ═CHT wherein T is a C 3 –C 10 alkyl group, and (ii) a catalyst system obtained by contacting: (A) a metallocene compound comprising formula (II): wherein R13 is a linear or branched C 1 –C 20 alkyl radical; R 9 is a C 2 –C 20 alkyl or C 6 –C 20 aryl radical; R 10 , R 11 and R 12 are hydrogen, T 3 and T 4 are moieties of formula (IIa) or (IIb): wherein when T 3 and T 4 are moieties of formula (IIa), A 1 bonds to the cyclopentadienyl group in position 2 and 5; when T 3 and T 4 are moieties of formula (IIb), A 1 bonds to the cyclopentadienyl group in position 3 and 4; A 1 is sulfur in the moiety (IIa); A 1 is NR in the moiety (IIb); x, equal to or different from each other, is hydrogen, a halogen, R, OR, OR′O, OSO 2 CF 3 , OCOR, SR, NR 2 or PR 2 ; R is a linear or branched, saturated or unsaturated C 1 –C 20 -alkyl, C 3 –C 20 -cycloalkyl, C 6 –C 20 -aryl, C 7 –C 20 -alkylaryl, or C 7 –C 20 -arylalkyl radical, optionally containing heteroatorns 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 the group consisting of CR 7 2 , SiR 7 2 , (CR 7 2 ) 2 and (SiR 7 2 ) 2 radicals; R 7 , equal to or different from each other, is hydrogen or a linear or branched, saturated or unsaturated C 1 –C 20 -alkyl, C 3 –C 20 -cycloalkyl, C 6 –C 20 -aryl, C 7 –C 20 -alkylaryl, or C 7 –C 20 -arylalkyl radical, optionally containing heteroatoms belonging to groups 13–17 of the Periodic Table of Elements, with two R 7 groups optionally forming an aliphatic ring having 3 to 8 atoms which can have at least one alkyl substituent; M is a transition metal selected from those belonging to group 3, 4, or a lanthanide or actinide group in the Periodic Table of Elements (new IUPAC version); p is 1 or 2 and is equal to an oxidation state of M minus 2; R 14 is a C 1 –C 20 alkyl radical; with (B) an alumoxane and/or a compound that forms an alkyl metallocene cation thereby forming a polymerized product, the polymerized product comprising: 65>mm>100; an intrinsic viscosity greater than about 0.45; 4,1 insertions less than about 0.19%; and an extractable content in boiling diether of less than about 2%.