Process for the preparation of an olefin polymer using metallocenes containing specifically substituted indenyl ligands

Abstract

Process for the preparation of an olefin polymer using metallocenes containing specifically substituted indenyl ligands A highly effective catalyst system for the polymerization of olefins comprises a cocatalyst, preferably an aluminoxane, and a metallocene of the formula I in which, preferably M 1 is Zr or Hf, R 1 and R 2 are alkyl or halogen, R 5 is hydrogen or alkyl, R 3 and R 4 are alkyl, where R 3 , R 4 and R 5 may be halogenated, —(CR 7 R 8 ) m —R 6 —(CR 7 R 8 ) n — is a single- or multi-membered chain in which R 6 may also be a (substituted) heteroatom, and m+n is zero or 1.

We claim:  
     
       1. A compound of the formula I                    
       in which 
       M 1  is a metal from group IVb, Vb or VIb of the Periodic Table,  
       R 1  and R 2  are identical or different and are a hydrogen 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, a C 8 -C 40 -arylalkenyl group or a halogen atom,  
       R 3 , R 4  and R 5  are identical or different and R 3  and R 4  and/or R 5  are other than hydrogen and are a C 1 -C 20 -alkyl group, a C 6 -C 20 -aryl 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, these radicals optionally being halogenated,  
       R 5  may alternatively be hydrogen,  
       R 6  is                    
       ═BR 9 , ═AlR 9 , —Ge—, —Sn—, —O—, —S—, ═SO, ═SO 2 , ═NR 9 , ═CO, ═PR 9  or ═P(O)R 9 , 
       where 
       R 9 , R 10  and R 11  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 -aryl group, a C 6 -C 10 -fluoroaryl 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 9  and R 10  or R 9  and R 11 , in each case together with the atoms connecting them, form a ring,  
       M 2  is silicon, germanium or tin,  
       R 7  and R 8  are identical or different and are as defined for R 9 , and  
       m and n are identical or different and are zero, 1 or 2,  
       where m plus n is zero, 1 or 2.  
     
     
       2. A compound as claimed in  claim 1 , wherein, in the formula I, M 1  is Zr or Hf, R 1  and R 2  are identical or different and are (C 1 -C 3 )-alkyl or chlorine, R 3  and R 4  are identical or different and are (C 1 -C 10 )-alkyl, which is optionally halogenated, R 5  is hydrogen or (C 1 -C 10 )-alkyl, which is optionally halogenated, R 6  is a                    
       radical, and R 9  and R 10  are identical or different and are (C 1 -C 10 )-alkyl or (C 6 -C 10 ) -aryl. 
     
     
       3. A compound as claimed in  claim 1 , wherein R 5  is hydrogen. 
     
     
       4. A compound as claimed in  claim 2 , wherein R 5  is hydrogen. 
     
     
       5. A compound of the formula I                    
       in which 
       M 1  is a metal from group IVb of the Periodic Table,  
       R 1  and R 2 are identical or different and are a hydrogen 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, a C 8 -C 40 -arylalkenyl group or a halogen atom,  
       R 3  and R 4  are identical or different and are C 1 -C 10 -alkyl, which is optionally halogenated, R 5  is hydrogen, C 6 -C 10 -aryl or C 1 -C 10 -alkyl, which is optionally halogenated,  
       R 9  and R 10  are identical or different and are C 1 -C 10 -alkyl or C 6 -C 10 -aryl,  
       R 7  and R 8  are identical or different and are as defined for R 9 , and  
       m and n are identical or different and are zero, 1 or 2, where m plus n is zero, 1 or 2.  
     
     
       6. A compound as claimed in  claim 5 , wherein R 5  is hydrogen. 
     
     
       7. Rac- dimethylsilanediylbis (   2 , 5 , 6   - trimethyl -   1   - indenyl ) zirconium dichloride.