Titanocenen-based catalyst system

Abstract

A catalyst system obtainable by the process comprising the steps of contacting an adduct of formula (I) MgT 2 .y AlQ j (OR″) 3-j   (I) wherein T is chlorine, bromine, or iodine; R″ is a linear or branched C 1 -C 10 alkyl radical; y ranges from 1.00 to 0.05; and j ranges from 0.01 to 3.00; with at least one metallocene compound having titanium as central metal and at least one ligand having a cyclopentadienyl skeleton.

1 - 10 . (canceled)  
     
     
         11 . A catalyst system obtained by a process comprising: 
 contacting: 
 (i) a partially dealcoholated adduct of formula MgT 2 .wR′OH, wherein 
 T is chlorine, bromine, or iodine;  
 R′ is a linear or branched C 1 -C 10  alkyl radical; and  
 w is a non-integer number ranging from 3 to 0.1; with  
 
 (ii) an organo-aluminium compound of formula H e AlU 3-e  or H e Al 2 U 6-e , wherein 
 U, same or different, are hydrogen, halogen, or hydrocarbon radicals comprising from 1 to 20 carbon atoms, and optionally comprise at least one silicon or germanium atom; with the proviso that at least one  
 U is different from halogen; and  
 E is a non-integer number ranging from 0 to 1;  
 
 to obtain an adduct of formula (I)  
   MgT 2 .yAlQ j (OR″) 3-j    (I)  
 wherein  
 y ranges from 1.00 to 0.05;  
 Q, same or different, are hydrocarbon radicals comprising from 1 to 20 carbon atoms, and optionally comprise at least one silicon or germanium atom;  
 R″ is a linear or branched C 1 -C 10  alkyl radical; and  
 J is a non-integer number ranging from 0.01 to 3.00; and  
   contacting the adduct of formula (I) with at least one metallocene compound comprising titanium as a central metal and at least one ligand comprising a cyclopentadienyl skeleton;    with the proviso that the metallocene compound has not been previously treated with an organo-aluminium compound of formula H e AlU 3-e  or H e Al 2 U 6-e , or an alumoxane.    
     
     
         12 . The catalyst system according to  claim 11 , wherein T is chlorine; R′ is a linear C 1 -C 10  alkyl radical; and w is a non-integer number ranging from 3 to 0.5.  
     
     
         13 . The catalyst system according to  claim 11 , wherein U is a linear or branched C 1 -C 20 -alkyl radical.  
     
     
         14 . The catalyst system according to  claim 11 , wherein y ranges from 0.50 to 0.10; and j is a non-integer number ranging from 2.50 to 2.00.  
     
     
         15 . The catalyst system according to  claim 11 , wherein the adduct of formula (I) has a surface area (BET) higher than 30 m 2 /g.  
     
     
         16 . The catalyst system according to  claim 11 , wherein the adduct of formula (I) comprises generally between 1000 μmol/g to 1 μmol/g of the metallocene compound, and the adduct of formula (I) supports the metallocene compound after the adduct of formula (I) is contacted with the metallocene compound.  
     
     
         17 . The catalyst system according to  claim 11 , wherein the metallocene compound is a titanocene compound comprising at least one of formulas (II), (III), (IV) or (V):  
       
         
           
           
               
               
           
         
       
       wherein 
 Ti is titanium;  
 X, same or different, are monoanionic sigma ligands selected from the group consisting of hydrogen, halogen, R 6 , OR 6 , OCOR 6 , SR 6 , NR 6   2  and PR 6   2 , wherein R 6  is a hydrocarbon radical comprising from 1 to 20 carbon atoms, wherein R 6  optionally comprises one or more Si or Ge atoms;  
 p is an integer ranging from 1 to 2;  
 L is a divalent bridging group selected from a C 1 -C 20  alkylidene, a C 3 -C 20  cycloalkylidene, a C 6 -C 20  arylidene, a C 7 -C 20  alkylarylidene, or a C 7 -C 20  arylalkylidene radical optionally comprising at least one heteroatom belonging to groups 13-17 of the Periodic Table of Elements, and a silylidene radical containing up to 5 silicon atoms;  
 R 1 , R 2 , R 3 , R 4  and R 5 , same or different, are selected from hydrogen and C 1 -C 40  hydrocarbon groups optionally comprising one or more heteroatoms belonging to groups 13-17 of the Periodic Table of Elements; or two adjacent R 1 , R 2 , R 3 , R 4  and R 5  form at least one 3-7 membered ring optional comprising one or more heteroatoms belonging to groups 13-17 of the Periodic Table of Elements;  
 A is NR 8 , O, or S, wherein R 8  is a C 1 -C 20  hydrocarbon group optionally comprising one or more heteroatoms belonging to groups 13-17 of the Periodic Table of Elements;  
 A 1  is hydrogen, halogen, R 6 , OR 6 , OCOR 6 , SR 6 , NR 6   2 , PR 6   2 , or NR 9 , wherein R 6  is a hydrocarbon radical comprising from 1 to 20 carbon atoms, wherein R 6  optionally comprises one or more Si or Ge atoms; and R 9  is a C 1 -C 40  hydrocarbon group optionally comprising one or more heteroatoms belonging to groups 13-17 of the Periodic Table of Elements;  
 
     
     
         18 . A process for (co)polymerizing at least one olefin comprising from 2 to 20 carbon atoms comprising contacting the at least one olefin under polymerization conditions in presence of the catalyst system of  claim 11 .  
     
     
         19 . The process according to  claim 18 , wherein at least one alpha-olefin is (co)polymerized.  
     
     
         20 . The process according to  claim 19 , wherein the alpha-olefin is selected from propylene, ethylene, 1-butene, 1-hexene, 1-octene, and combinations thereof.