Ziegler-natta catalysts for olefin polymerization

A Ziegler-Natta catalyst component for olefin polymerization, comprising

• an internal donor selected from compounds of formula (I)
• wherein
• X1 and X2 are each independently selected from O and N(R5);
• R1 is an oxygen-containing heterocyclic ring;
• R2 is selected from H and methyl;
• R3 and R4 are independently selected from C1-4-alkyl;
• R5 is selected from a group consisting of H, a linear C1-8-alkyl group, a branched C1-8-alkyl group, and a cyclic C1-8-alkyl group.

A method for producing a Ziegler-Natta catalyst component, comprising adding an internal donor selected from compounds of formula (I)

• wherein
• X1 and X2 are each independently selected from O and N(R5);
• R1 is an oxygen-containing heterocyclic ring;
• R2 is selected from H and methyl;
• R3 and R4 are independently selected from C1-4-alkyl;
• R5 is selected from a group consisting of H, a linear C1-8-alky group, a branched C1-8-alkyl group, and a cyclic C1-8-alkyl group
• to a process of preparing the Ziegler-Natta catalyst component.

A Ziegler-Natta catalyst component for olefin polymerization, comprising

• an internal donor selected from compounds of formula (I)
• wherein
• X1 and X2 are each independently selected from O and N(R5);
• R1 is selected from a group consisting of H, C1-3-alkyl, and oxygen-containing heterocyclic ring;
• R2 is selected from H and methyl, with the provisio that only one of R1 and R2 may be H, if X1 and X2 are O;
• R3 and R4 are independently selected from C1-4-alkyl;
• R5 is selected from a group consisting of H, a linear C1-8-alkyl group, a branched C1-8-alkyl group and a cyclic C1-8-alkyl group,
• wherein the Ziegler-Natta catalyst component is obtained by a method comprising:
• (M-a) providing a solid support;
• (M-b) pre-treating the solid support of step (M-a) with a compound of Group 13 element;
• (M-c) treating the pre-treated solid support of step (M-b) with a compound of a transition metal of Group 4 to 6;
• and
• (M-d) recovering the Ziegler-Natta catalyst component;
• wherein the solid support is contacted with an internal donor selected from compounds of formula (I) or mixtures therefrom before treating the solid support in step (M-c).

A method for producing a Ziegler-Natta catalyst component, comprising adding an internal donor selected from compounds of formula (I)

• wherein
• X1 and X2 are each independently selected from O and N(R5);
• R1 is selected from a group consisting of H, C1-3-alkyl, and oxygen-containing heterocyclic ring;
• R2 is selected from H and methyl, with the provisio that only one of R1 and R2 may be H, if X1 and X2 are O;
• R3 and R4 are independently selected from C1-4-alkyl;
• R5 is selected from a group consisting of H, a linear C1-8-alkyl group, a branched C1-8-alkyl group and a cyclic C1-8-alkyl group
• to a process of preparing the Ziegler-Natta catalyst component,
• wherein the method comprises:
• (M-a) providing a solid support;
• (M-b) pre-treating the solid support of step (M-a) with a compound of Group 13 element;
• (M-c) treating the pre-treated solid support of step (M-b) with a transition metal compound of Group 4 to 6;
• (M-d) recovering the Ziegler-Natta catalyst component;
• wherein the solid support is contacted with an internal donor selected from compounds of formula (I) or mixtures therefrom before treating the solid support in step (M-c).