| 摘要 |
The invention relates to a process for preparing a polymerization catalyst component wherein a solid compound with formula Mg(OR1)xCl2-x wherein x is larger than 0 and smaller than 2, and each R1, independently, represents an alkyl group, said compound being obtained by reacting a Grignard compound with an alkoxy- or aryloxy-containing silane compound, is contacted with at least one activating compound selected from the group formed by internal electron donors and compounds of formula M(OR2)v-w(R3)w, wherein M can be Ti, Zr, Hf, Al or Si, each R2 and R3, independently, represent an alkyl, alkenyl or aryl group, v is the valency of M and w is smaller than v, in the presence of an inert dispersant to give an intermediate reaction product, and wherein the intermediate reaction product is contacted with a halogen-containing Ti-compound. A catalyst system comprising said component shows improved performance in olefin polymerization.;The invention also relates to a polymerization catalyst system comprising the catalyst component and to a process of making a polyolefin by contacting at least one olefin with a polymerization catalyst system comprising the catalyst component. |
| 主权项 |
1. A process for preparing a polymerization catalyst component comprising:
i) contacting a compound R4zMgX2-z wherein R4 is an organic group, X is a halide, and z is larger than 0 and smaller than 2, with an alkoxy- or aryloxy-containing silane compound to give a solid magnesium-containing compound of formula Mg(OR1)xCl2-x wherein x is larger than 0 and smaller than 2, and each R1, independently, represents an alkyl group; ii) contacting the solid Mg(OR1)xCl2-x with a mixture of two activating compounds, one activating compound being an internal electron donor selected from the group consisting of carboxylic acids, carboxylic acid anhydrides, carboxylic acid esters, carboxylic acid halides, alcohols, ethers, ketones, amines, amides, nitriles, aldehydes, alkoxides, sulphonamides, thioethers, thioesters and organic compounds containing one or more hetero atoms selected from the group consisting of nitrogen, oxygen, sulphur and phosphorus and the other activating compound being a compound of formula M(OR2)v-w(R3)w, wherein M is Ti, Zr, Hf, Al or Si, each R2 and R3, independently, represent an alkyl, alkenyl or aryl group, v is the valency of M and w is smaller than v, in the presence of an inert dispersant to give an intermediate reaction product; and iii) contacting the intermediate reaction product with a halogen-containing Ti-compound wherein when the compound of formula M(OR2)v-w(R3)w is titanium tetraalkoxide, then the internal electron donor is selected from the group consisting of carboxylic acids, carboxylic acid anhydrides, carboxylic acid esters, carboxylic acid halides, ethers, ketones, amines, amides, nitriles, aldehydes, alkoxides, sulphonamides, thioethers, thioesters and organic compounds containing one or more hetero atoms selected from the group consisting of nitrogen, oxygen, sulphur and phosphorus. |
