| 摘要 |
The present invention relates to a process for preparing a solid catalyst component suitable for producing polyethylene and its copolymers, said process comprising the steps of: (a) contacting a dehydrated support having hydroxyl groups with a magnesium compound having the general formula MgR1R2; (b) contacting the product obtained in step (a) with modifying compounds (A), (B) and (C), wherein: (A) is at least one compound selected from the group consisting of carboxylic acid, carboxylic acid ester, ketone, acyl halide, aldehyde and alcohol; (B) is a compound having the general formula R11f(R12O)gSiXh, (C) is a compound having the general formula (R13O)4M, and (c) contacting the product obtained in step (b) with a titanium halide compound having the general formula TiX4, wherein Ti is a titanium atom and X is a halide atom. The invention also relates to a solid catalyst component obtainable by said process. The invention further relates to a process for producing polyethylene and its copolymers in the presence of the solid catalyst component and a co-catalyst. |
| 主权项 |
1. A process for preparing a solid catalyst component suitable for producing polyethylene and its copolymers, said process comprising:
(a) forming a first product by contacting a dehydrated support having hydroxyl groups with a magnesium compound having the general formula MgR1R2, wherein R1 and R2 are the same or different and are independently selected from the group comprising an alkyl group, alkenyl group, alkadienyl group, aryl group, alkaryl group, alkenylaryl group and alkadienylaryl group; (b) contacting the first product with modifying compounds (A), (B) and (C), to form a second product, wherein:
(A) is at least one compound selected from the group consisting of carboxylic acid, carboxylic acid ester, ketone, acyl halide, aldehyde and alcohol;(B) is a compound having the general formula R11f(R12O)gSiXh, wherein f, g and h are each integers from 0 to 4 and the sum of f, g and h is equal to 4 with a proviso that when h is equal to 4 then modifying compound (A) is not an alcohol, Si is a silicon atom, O is an oxygen atom, X is a halide atom and R11 and R12 are the same or different and are independently selected from the group comprising an alkyl group, alkenyl group, alkadienyl group, aryl group, alkaryl group, alkenylaryl group and alkadienylaryl group;(C) is a compound having the general formula (R13O)4M, wherein M is a titanium atom, a zirconium atom or a vanadium atom, O is an oxygen atom and R13 is selected from the group comprising an alkyl group, alkenyl group, alkadienyl group, aryl group, alkaryl group, alkenylaryl group and alkadienylaryl group; and (c) contacting the second product with a titanium halide compound having the general formula TiX4, wherein Ti is a titanium atom and X is a halide atom, to form the solid catalyst component, wherein the total molar ratio of compound (C) and TiX4 to hydroxyl groups is from 0.05 to 1.0. |
