FIELD: chemistry.
SUBSTANCE: catalyst component contains magnesium, titanium and a halogen and additionally contains an internal electron donor, having the structure [R1-O-C(O)-O-]xR2, where R1 independently in each case represents an aliphatic or aromatic hydrocarbon or a substituted hydrocarbon group containing 1-20 carbon atoms; x equals 2-4 and R2 represents an aliphatic or aromatic hydrocarbon or a substituted hydrocarbon group containing 1-20 carbon atoms, under the condition that the shortest chain linking the first R1-O-C(O)-O-group and the second R1-O-C(O)-O-group contains 3-4 atoms. A method of polymerising olefins is carried out in the presence of the said component. The compound has the structure [R1-O-C(O)-O-]xR2, where R1 independently in each case represents an aliphatic or aromatic hydrocarbon or a substituted hydrocarbon group containing 1-20 carbon atoms, x equals 2-4 and R2 represents a 1,8-disubstituted naphthalene moiety.
EFFECT: said internal donors provide high catalytic activity and high hydrogen response during polymerisation, and enable to obtain propylene-based polymers with high isotacticity, commonly expressed as a xylene soluble fraction and/or final melting temperature.
15 cl, 5 tbl
