Patent WO-2023213992-A1 (WO)
Title: Process for preparing a propylene composition
Inventor: NDORO TINASHE
IPC: C08F10/06
Filed: 2023-05-05
Abstract: The invention relates to Process for the preparation of a polypropylene composition comprising a propylene-based polymer which is a propylene homopolymer or propylene-ethylene copolymer having an ethylene content of less than 1.0 wt% based on the propylene-ethylene copolymer, wherein the polypropylene composition has • a melt flow rate (MFR) in the range from 0.50 to 110 dg/min, wherein the melt flow rate is determined using 1501133-1:2011 using 2.16kg at 230°C, wherein the process comprises the step of polymerizing propylene and optional ethylene comonomers in the presence of a catalyst in a gas phase to obtain the propylene-based polymer, wherein said catalyst comprises a procatalyst, a cocatalyst and optionally an external electron donor, wherein the procatalyst is obtainable by a process comprising the steps of: • contacting a magnesium-containing support with a halogen containing titanium compound, and an internal electron donor according to Formula (I) wherein R 1  is a secondary alkyl group and R 2  is a non-secondary alkyl group having at least 5 carbon atoms, preferably R is a non- secondary alkyl group being branched at the 3-position or further positions; said procatalyst is prepared according to the following steps: · i) contacting a compound R4zMgX 4  2-z  with an alkoxy- or aryloxy-containing silane compound to give a first intermediate reaction product, being a solid Mg(OR a )  x X 1 
 2- x-  wherein: R a  is a linear, branched or cyclic hydrocarbyl group independently selected from alkyl, alkenyl, aryl, aralkyl, alkoxycarbonyl or alkylaryl groups, and one or more combinations thereof; wherein said hydrocarbyl group may be substituted or unsubstituted, may contain one or more heteroatoms and preferably has from 1 to 20 carbon atoms; wherein R 4  is a linear, branched or cyclic hydrocarbyl group independently selected from alkyl, alkenyl, aryl, aralkyl, alkoxycarbonyl or alkylaryl groups, and one or more combinations thereof; wherein said hydrocarbyl group may be substituted or unsubstituted, may contain one or more heteroatoms and preferably has from 1 to 20 carbon atoms, preferably R 4  is butyl; wherein X 4  and X 1  are each independently selected from the group of consisting of fluoride (F-), chloride (CI-), bromide (Br-) or iodide (I-), preferably chloride; z is in a range of larger than 0 and smaller than 2, being 0 < z < 2, x is an integer between 0 and 2; ii) optionally contacting the solid Mg(OR a )xX1  2-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 M 1 (OR b ) v-w (OR 3 )w or M 2 (OR b ) v-w (R 3 ) w , to obtain a second intermediate product; wherein: M 1  is a metal selected from the group consisting of Ti, Zr, Hf, Al or Si; v is the valency of M 1 ; M 2  is a metal being Si; v is the valency of M 2 ; R b  and R 3  are each a linear, branched or cyclic hydrocarbyl group independently selected from alkyl, alkenyl, aryl, aralkyl, alkoxycarbonyl or alkylaryl groups, and one or more combinations thereof; wherein said hydrocarbyl group may be substituted or unsubstituted, may contain one or more heteroatoms, and preferably has from 1 to 20 carbon atoms; wherein w is smaller than v, preferably v being 3 or 4; iii) contacting the first or second intermediate reaction product, obtained respectively in step i) or ii), with a halogen-containing Ti- compound and said compound represented Formula (I), as the internal electron donor.