Process for polymerization of polypropylene using ziegler-natta procatalyst with novel 1,3-diether internal donors

A process for preparing a procatalyst for polymerization of olefins, comprising contacting a magnesium-containing support with a halogen-containing titanium compound, and an internal electron donor;

• said process comprising the steps of:
• i) contacting a compound R4zMgX42-z with an alkoxy- or aryloxy-containing silane compound to give a first intermediate reaction product, being a solid Mg(ORa)xX12-x, wherein:
• Ra is a linear, branched or cyclic hydrocarbyl group independently selected from alkyl, alkenyl, aryl, aralkyl, alkoxycarbonyl or alkylaryl groups, or one or more combinations thereof;
• wherein said hydrocarbyl group may be substituted or unsubstituted, may contain one or more heteroatoms;
• wherein R4 is a linear, branched or cyclic hydrocarbyl group independently selected from alkyl, alkenyl, aryl, aralkyl, alkoxycarbonyl or alkylaryl groups, or one or more combinations thereof;
• wherein said hydrocarbyl group may be substituted or unsubstituted, may contain one or more heteroatoms;
• wherein X4 and X1 are each independently selected from fluoride (F—), chloride (Cl—), bromide (Br—) or iodide (I—);
• z is in a range of larger than 0 and smaller than 2, being 0<z<2;
• ii) optionally contacting the solid Mg(ORa)xX12-x obtained in step i) with at least one activating compound selected from the group formed by activating electron donors and metal alkoxide compounds of formula M1(ORb)v-w(OR3)w or M2 (ORb)v-w(R3)w, to obtain a second intermediate product;
• wherein:
• M1 is a metal selected from Ti, Zr, Hf, Al or Si;
• v is the valency of M1;
• M2 is a metal being Si;
• v is the valency of M2;
• Rb and R3 are each a linear, branched or cyclic hydrocarbyl group independently selected from alkyl, alkenyl, aryl, aralkyl, alkoxycarbonyl or alkylaryl groups, or one or more combinations thereof;
• wherein said hydrocarbyl group may be substituted or unsubstituted, may contain one or more heteroatoms;
• wherein w is smaller than v;
• iii) contacting the first or second intermediate reaction product, obtained respectively in step i) or ii), with a halogen-containing Ti-compound,
• wherein the internal electron donor comprises (1-methoxy-2-(methoxymethyl)-5-methylhexan-2-yl)cyclopentane, 3,3-bis(methoxymethyl)-2-methyloctane, 3,3-bis(methoxymethyl)-2,6-dimethyloctane, 3,3-bis(methoxymethyl)-2,4-dimethylheptane, or a combination thereof.