Catalyst system for polymerisation of an olefin

Abstract

The present invention relates to a catalyst system comprising a procatalyst, a co-catalyst and an external electron donor, wherein the external electron donor comprises a compound having the structure according to Formula I: Si(L) n (OR 11 ) 4−n   (Formula I), wherein, Si is a silicon atom with valency 4+; O is an oxygen atom with valency 2− and O is bonded to Si via the silicon-oxygen bond; n is 1, 2, 3 or 4; R 11 is a selected from the group consisting of linear, branched and cyclic alkyl having at most 20 carbon atoms and aromatic substituted and unsubstituted hydrocarbyl having 6 to 20 carbon atoms; L is a group represented by Formula II wherein, L is bonded to the silicon atom via the nitrogen-silicon bond; L has a single substituent on the nitrogen atom, where this single substituent is an imine carbon atom; and X and Y are independently selected from the group consisting of a hydrogen atom; a heteroatom selected from group 13, 14, 15, 16 or 17 of the IUPAC Periodic Table of the Elements; a linear, branched and cyclic alkyl having at most 20 carbon atoms, optionally containing a heteroatom selected from group 13, 14, 15, 16 or 17 of the IUPAC Periodic Table of the Elements and an aromatic substituted and unsubstituted hydrocarbyl having 6 to 20 carbon atoms, optionally containing a heteroatom selected from group 13, 14, 15, 16 or 17 of the IUPAC Periodic Table of the Elements.

1 . A polyolefin formed by the process comprising:
 contacting an olefin with catalyst system to form the polyolefin, wherein the catalyst system comprises a Ziegler-Natta type procatalyst, a co-catalyst and at least one external electron donor, wherein the external electron donor comprises a compound having the structure according to Formula I:
   Si(L) n (OR 11 ) 4−n   (Formula I),
 
   wherein,   Si is a silicon atom with valency 4+;   O is an oxygen atom with valency 2− and O is bonded to Si via a silicon-oxygen bond;   n is 1, 2, 3 or 4;   R 11  is a selected from the group consisting of linear, branched and cyclic alkyl having at most 20 carbon atoms and aromatic substituted and unsubstituted hydrocarbyl having 6 to 20 carbon atoms;   L is a group represented by the following structure   
       
         
           
           
               
               
           
         
         wherein, 
         L is bonded to the silicon atom via a nitrogen-silicon bond; 
         L has a single substituent on the nitrogen atom, where this single substituent is an imine carbon atom; and 
         X and Y are each independently selected from the group consisting of:
 a) a hydrogen atom; 
 b) a group comprising a heteroatom selected from group 13, 14, 15, 16 or 17 of the IUPAC Periodic Table of the Elements through which X and Y are each independently bonded to the imine carbon atom of Formula II, wherein the heteroatom is substituted with a group consisting of a linear, branched and cyclic alkyl groups having at most 20 carbon atoms, optionally containing a heteroatom selected from group 13, 14, 15, 16 or 17 of the IUPAC Periodic Table of the Elements; and/or with an aromatic substituted and unsubstituted hydrocarbyl groups having 6 to 20 carbon atoms, optionally containing a heteroatom selected from group 13, 14, 15, 16 or 17 of the IUPAC Periodic Table of the Elements; 
 c) a linear, branched and cyclic alkyl having at most 20 carbon atoms, optionally containing a heteroatom selected from group 13, 14, 15, 16 or 17 of the IUPAC Periodic Table of the Elements; and 
 d) an aromatic substituted and unsubstituted hydrocarbyl having 6 to 20 carbon atoms, optionally containing a heteroatom selected from group 13, 14, 15, 16 or 17 of the IUPAC Periodic Table of the Elements. 
 
       
     
     
         2 . The polyolefin according to  claim 1 , wherein L is guanidine, amidine or ketimide. 
     
     
         3 . The polyolefin according to  claim 1 , wherein R 11  is an alkyl having at most 10 carbon atoms. 
     
     
         4 . The polyolefin accordingly to  claim 1 , wherein the polyolefin has 
     
     
         5 . The polyolefin according to  claim 1 , wherein the polyolefin is a propylene-based polymer. 
     
     
         6 . The polyolefin according to  claim 1 , wherein the polyolefin has a comonomer content of up to 10 mol %. 
     
     
         7 . The polyolefin according to  claim 1 , wherein the polyolefin has a comonomer content of 5 to 80 mol %. 
     
     
         8 . The polyolefin according to  claim 7 , wherein the comonomer content is 10 to 60 mol %. 
     
     
         9 . The polyolefin according to  claim 1 , wherein the polyolefin has a lump content between 2.8 and 11.7 wt %. 
     
     
         10 . The polyolefin according to  claim 1 , wherein the polyolefin has a lump content below 10 wt %. 
     
     
         11 . The polyolefin according to  claim 10 , wherein the polyolefin has a lump content below 4 wt %. 
     
     
         12 . The polyolefin according to  claim 11 , wherein the polyolefin has a lump content below 3 wt %. 
     
     
         13 . A shaped article comprising the polyolefin according to  claim 1 . 
     
     
         14 . A polyolefin formed with a lump content below 10 wt % in the reactor for making the polyolefin.