Catalyst components for the polymerization of olefins and catalysts therefrom obtained

摘要

Catalyst component comprising Mg, Ti, and halogen atoms, and is characterized in that (a) the Ti atoms are present in an amount higher than 4% based on the total weight of the said catalyst component, (b) the amount of Mg and Ti atoms is such that the Mg/Ti molar ratio is higher than 2 and (c) by a X-ray diffraction spectrum, in which, in the range of 2θ diffraction angles between 47° and 52°, at least two diffraction lines are present at diffraction angles 2θ of 48.3±0.2°, and 50.0±0.2°, the most intense diffraction lines being the one at 2θ of 50.0±0.2°, the intensity of the other diffraction line being equal to or lower than the intensity of the most intense diffraction line.

主权项

1. A catalyst comprising:
a catalyst component comprising, Mg, a Ti compound has the formula Ti(ORIII)nX4-n, and an halogen atom, wherein n is a number comprised between 0 and 1 inclusive, RIII is an alkyl, cycloalkyl or aryl radical having 2-8 carbon atoms and X is halogen wherein: (a) the Ti atoms are present in an amount higher than 4% based on the total weight of the catalyst component, (b) the amount of Mg and Ti atoms is such that the Ti/Mg molar ratio is lower than 1, (c) an X-ray diffraction spectrum, wherein in the range of 2θ diffraction angles between 47.0° and 52.0°, at least two diffraction peaks are present at diffraction angles 2θ of 48.0 ±0.2°, and 50.2±0.2°, and (d) wherein the Ti compound is combined with TiOCl2.