Catalyst components for the polymerization of olefins

摘要

The present invention relates to catalysts component for the polymerization of ethylene and its mixtures with olefins CH2═CHR, wherein R is an alkyl, cycloalkyl or aryl radical having 1-12 carbon atoms, comprising Ti, Mg, halogen, and electron donor belonging to 1,2-diethers as internal electron donor compound. The catalyst of the invention is suitably used in (co)polymerization processes of ethylene to prepare (co)polymers having narrow Molecular Weight Distribution (MWD) and high bulk density.

主权项

1. A catalyst for polymerizing olefins, comprising the reaction product of a spherical catalyst component and an alkylaluminum compound, wherein the spherical catalyst component comprises Mg, Ti, halogen, and an electron donor compound of formula (I):
RaCR1(OR4)—CR2R3(OR5)  (I) wherein Ra is methyl or is condensed with R4 to form a cycle; R1, R2 and R3 are, independently, hydrogen or C1-C20 hydrocarbon groups optionally comprising heteroatoms; and R4 and R5 are, independently, methyl or can be joined with R1 and R3 respectively to form a cycle; wherein the Ti atoms are from a titanium compound comprising at least one Ti-halogen bond, and the Mg atoms are from magnesium chloride.