| 摘要 |
<p>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:
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒSi (L) n (OR 1 ) 4-n €ƒ€ƒ€ƒ€ƒ€ƒ(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 1 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.</p> |
