| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention describes catalyst components containing Ti, Mg, Cl and an optional OR1 group, in which R1 denotes a C1-C20 hydrocarbon group in such an amount that molar ratio OR1/Ti is less than 0.5, characterised by the following properties: BET specific surface area less than 80 m2/g; total porosity (Pt) measured using a mercury method in the range of 0.70-1.50 cm3/g; the difference (Pt-Pf) is greater than 0.1, where PT denotes total porosity and PF denotes porosity due to pores with radius less than or equal to 1 mcm; the amount of Ti in the catalyst component is less than 10 wt %, based on total weight of the catalyst component. Described is a method of producing said components, involving a first step (a) where a compound MgCl2.m(RIIIOH)tH2O, in which 0.3ëñmëñ1.7, t ranges from 0.01 to 0.6 and RIII denotes an alkyl, cycloalkyl or aryl radical, having 1-12 carbon atoms, reacts with a titanium compound of formula Ti(ORII)nXy-n, in which n lies between 0 and 0.5, y is titanium valence, X denotes a halogen and RIV denotes an alkyl radical having 1-8 carbon atoms; and a second step (b) in which a solid product obtained from step (a) undergoes thermal treatment at temperature higher than 100C. Described also is a method for (co)polymerisation of ethylene in the presence of a catalyst system containing a product of reaction of solid catalyst components described above and an aluminium alkyl compound. ^ EFFECT: catalyst components exhibit high morphological stability under conditions for low-molecular polymerisation of ethylene, while maintaining high activity. ^ 10 cl, 4 tbl, 16 ex |
