| 摘要 |
<p>The invention relates to a process for olefin polymerisation at a temperature of from -100 to 0°C or 100 to 300°C using a catalyst system of the following formula :
<Chemistry id="chema01" num="0001"><Image id="ia01" he="45" wi="105" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" /></Chemistry>
wherein: M is Zr, Hf or Ti and is in its highest formal oxidation state (+4, d⁰ complex);
(C₅H<Sub>5-y-x</Sub>R<Sub>x</Sub>) is a cyclopentadienyl ring which is substituted with from zero to five substituent groups R, "x" is 0, 1, 2, 3, 4 or 5 denoting the degree of substitution, and each substituent group R is, independently, a radical selected from a group consisting of C₁-C₂₀ hydrocarbyl radicals, substituted C₁-C₂₀ hydrocarbyl radicals wherein one or more hydrogen atoms is replaced by a halogen atom, C₁-C₂₀ hydrocarbyl-substituted metalloid radicals wherein the metalloid is selected from the Group IV A of the Periodic Table of Elements, and halogen radicals, or (C₅H<Sub>5-y-x</Sub>R<Sub>x</Sub>) is a cyclopentadienyl ring in which two adjacent R-groups are joined forming a C₄-C₂₀ ring to give a polycyclic cyclopentadienyl ligand;
(JR'z-l-y) is a heteroatom ligand in which J is an element with a coordination number of three from Group VA or and element with a coordination number of two from Group VI A of the Periodic Table of Elements, and each R' is, independently a radical selected from a group consisting of C₁-C₂₀ hydrocarbyl radicals, substituted C₁-C₂₀ hydrocarbyl radicals
<!-- EPO <DP n="40"> -->wherein one or more hydrogen atoms is replaced by a halogen atom, and "z" is the coordination of number of the element J;
each Q may be independently, hydride, C₁-C₅₀ hydrocarbyl radicals, substituted hydrocarbyl radicals wherein one or more hydrogen atom is replaced by an electron-withdrawing group such as a halogen atom, or alkoxide radical, or C₁-C₅₀ hydrocarbyl-substituted metalloid radicals wherein the metalloid is selected from the Group IV-A of the Periodic Table of Elements, provided that where any Q is a hydrocarbyl such Q is different from
(C₅H<Sub>5-y-x</Sub>R<Sub>x</Sub>),
or both Q together may be an alkylidene, olefin, acetylene or a cyclometallated hydrocarbyl,
"y" is 0 or 1; when "y" is 1, B is a covalent bridging group containing a Group IV A or V A element,
L is a neutral Lewis base; and "w" is a number from 0 to 3,
[A]⁻ is a labile, bulky anion which is either a single coordination complex having a plurality of lipophilic radicals covalently coordinated to and shielding a charge bearing metal or metalloid centre or an anionic complex containing a plurality of boron atoms.</p> |
