Propylene is polymerised in the presence of a polymerisation catalyst comprising a solid catalyst component, an organoaluminium compound and an external electron donor, the process comprising the steps of (i) contacting propylene and hydrogen with the polymerisation catalyst in polymerisation conditions in a polymerisation reactor to produce a polymer of propylene; (ii) recovering the polymer of propylene from the polymerisation reactor; wherein the polymer of propylene has MFR of from more than 100 to 10000 g/10 min. The solid catalyst component comprises titanium, magnesium, halogen and an internal electron donor, characterised in that the internal electron donor is a compound according to formula (I) with R.sub.1 and R.sub.2 being the same or different and being a linear or branched C.sub.1-C.sub.12-alkyl group, and with R being H or a linear, branched or cyclic C.sub.1 to C.sub.12-alkyl, whereby it is preferred that R is not H. The external electron donor is a silane compound having the formula Si(OR.sup.11).sub.nR.sup.10.sub.4-n, wherein each R.sup.10 is independently a linear or branched C.sub.1-C.sub.4 alkyl, preferably methyl or ethyl; and each R.sup.10 is independently a linear or branched alkyl group having from 1 to 24 and optionally containing an atom of group 15 of periodic table of elements or comprises a cyclic group having from 6 to 12 carbon atoms.

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The present invention relates to novel organo-magnesium compounds obtained by reaction of dialkyl-magnesium compounds and carbodiimides and their use as precursors for the preparation of further magnesium compounds and catalysts.

A process for the preparation of an ultra-high molecular weight ethylene homopolymer having a MFR.sub.21 of 0.01 g/10 min or less, said process comprising: (I) prepolymerising at least ethylene at a temperature of 0 to 90° C. in the presence of a heterogeneous Ziegler Natta catalyst to prepare an ethylene prepolymer having an Mw of 40,000 to 600,000 g/mol; and thereafter in the presence of the prepolymer and said catalyst; (II) polymerising ethylene at a temperature of 55° C. or less, such as 20 to 55° C., to prepare said UHMW ethylene homopolymer; wherein the UHMW ethylene homopolymer comprises up to 8 wt. % of said prepolymer.

A process for the preparation of a solid catalyst component made from or containing a Ti compound, a coloring agent and optionally an electron donor on a Mg chloride based support, including step (a), carried out at a temperature ranging from 0 to 150° C., wherein (i) a Mg-based compound of formula (MgCl.sub.mX.sub.2-m).nLB, wherein m ranges from 0 to 2, n ranges from 0 to 6, X is, independently halogen, R.sup.1, OR.sup.1, —OCOR.sup.1 or O—C(O)—OR.sup.1 group, wherein R.sup.1 is a C.sub.1-C.sub.20 hydrocarbon group and LB is a Lewis base, is reacted with (ii) a liquid medium made from or containing a Ti compound having at least a Ti—Cl bond in an amount such that the Ti/Mg molar ratio is greater than 3; and an organic coloring agent is present either associated to the Mg-based compound or dispersed in the liquid medium made from or containing the titanium compound.

Provided is a solid catalyst component for polymerization of an olefin which is capable of realizing stereoregularity and wide molecular weight distribution of the resulting polymer, copolymerization activity, and block ratio of the resulting copolymer in a well-balanced manner while satisfying these properties at a level sufficient for practical use despite containing an electron-donating compound other than a phthalic acid ester. The present invention provides a solid catalyst component for polymerization of an olefin, comprising: magnesium, titanium, halogen, an ether carbonate compound (A), and a succinic acid diester compound (B), wherein a molar ratio represented by the following expression is 0.01 to 1.00: content of the ether carbonate compound (A)/content of the succinic acid diester compound (B).

Provided is a solid catalyst component for polymerization of an olefin which is capable of realizing stereoregularity and wide molecular weight distribution of the resulting polymer, copolymerization activity, and block ratio of the resulting copolymer in a well-balanced manner while satisfying these properties at a level sufficient for practical use despite containing an electron-donating compound other than a phthalic acid ester. The present invention provides a solid catalyst component for polymerization of an olefin, comprising: magnesium, titanium, halogen, an ether carbonate compound (A), and a succinic acid diester compound (B), wherein a molar ratio represented by the following expression is 0.01 to 1.00: content of the ether carbonate compound (A)/content of the succinic acid diester compound (B).

The present invention relates to a process for the polymerization of a polyolefin, preferably polypropylene, in a polymerization reactor by contacting one or more olefins, preferably propylene, with a catalyst system in said reactor while stirring, said catalyst system comprising: * a procatalyst comprising 1) a magnesium-containing support, 2) titanium, 3) a phthalate-free internal electron donor; and 4) optionally an activator; wherein said procatalyst is obtained by the following process: i) contacting a compound R.sup.4, MgX.sup.4.sub.2—, with an alkoxy- or aryloxy-containing silane compound to give a first intermediate reaction product, being a solid Mg(OR.sup.1).sub.xX.sup.1.sub.2-x, R.sup.4 is the same as R.sup.1 being 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 between 1 and 20 carbon atoms; wherein X.sup.4 and X.sup.1 are each independently a halide; z is in a range of larger than 0 and smaller than 2, being 0<z<2; x is in a range of larger than 0 and smaller than 2, being 0<x<2; ii) optionally contacting the solid Mg(OR.sup.1).sub.xX.sup.1.sub.2-x obtained in step ii) with at least one activating compound selected from the group formed by activating electron donors and metal alkoxide compounds of formula M′(OR.sup.2), .sub.w(OR.sup.I).sub.w or M.sup.2 (OR.sup.2)v-.sub.w(R.sup.I).sub.w, to obtain a second intermediate product; wherein: M.sup.1 is a metal selected from the group consisting of Ti, Zr, Hf, Al or Si; v is the valency of M.sup.1; M.sup.2 is a metal being Si; v is the valency of M.sup.2; R.sup.2 and R.sup.3 are each independently a hydrocarbyl group; w is smaller than v, v is preferably 3 or 4; iii) contacting the first or second intermediate reaction product, obtained respectively in step i) or ii), with the halogen-containing Ti-compound, the internal electron donor and optionally an activator; * optionally an external electron donor; and * a co-catalyst, being a alkyl aluminum co-catalyst preferably having formula AlH.sub.nR.sub.3-n, wherein H is a hydride; n is 0, 1 or 2, preferably 0; wherein R is a C1-C12 alkyl group, preferably ethyl; wherein a portion of the co-catalyst and optionally a portion of the external electron donor is (are) pre-contacted with the procatalyst prior to the addition of the catalyst system to the polymerization reactor. The present invention also relates to a polyolefin and a shaped article comprising said polyolefin.

The present invention relates to a process for the polymerization of a polyolefin, preferably polypropylene, in a polymerization reactor by contacting one or more olefins, preferably propylene, with a catalyst system in said reactor while stirring, said catalyst system comprising: * a procatalyst comprising 1) a magnesium-containing support, 2) titanium, 3) a phthalate-free internal electron donor; and 4) optionally an activator; wherein said procatalyst is obtained by the following process: i) contacting a compound R.sup.4, MgX.sup.4.sub.2—, with an alkoxy- or aryloxy-containing silane compound to give a first intermediate reaction product, being a solid Mg(OR.sup.1).sub.xX.sup.1.sub.2-x, R.sup.4 is the same as R.sup.1 being 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 between 1 and 20 carbon atoms; wherein X.sup.4 and X.sup.1 are each independently a halide; z is in a range of larger than 0 and smaller than 2, being 0<z<2; x is in a range of larger than 0 and smaller than 2, being 0<x<2; ii) optionally contacting the solid Mg(OR.sup.1).sub.xX.sup.1.sub.2-x obtained in step ii) with at least one activating compound selected from the group formed by activating electron donors and metal alkoxide compounds of formula M′(OR.sup.2), .sub.w(OR.sup.I).sub.w or M.sup.2 (OR.sup.2)v-.sub.w(R.sup.I).sub.w, to obtain a second intermediate product; wherein: M.sup.1 is a metal selected from the group consisting of Ti, Zr, Hf, Al or Si; v is the valency of M.sup.1; M.sup.2 is a metal being Si; v is the valency of M.sup.2; R.sup.2 and R.sup.3 are each independently a hydrocarbyl group; w is smaller than v, v is preferably 3 or 4; iii) contacting the first or second intermediate reaction product, obtained respectively in step i) or ii), with the halogen-containing Ti-compound, the internal electron donor and optionally an activator; * optionally an external electron donor; and * a co-catalyst, being a alkyl aluminum co-catalyst preferably having formula AlH.sub.nR.sub.3-n, wherein H is a hydride; n is 0, 1 or 2, preferably 0; wherein R is a C1-C12 alkyl group, preferably ethyl; wherein a portion of the co-catalyst and optionally a portion of the external electron donor is (are) pre-contacted with the procatalyst prior to the addition of the catalyst system to the polymerization reactor. The present invention also relates to a polyolefin and a shaped article comprising said polyolefin.

A process for the preparation of a propylene polymer containing a coloring agent in an amount ranging from 0.2 to 30 ppm referred to the weight of propylene polymer, including the steps of: a) providing a solid ZN catalyst component made from or containing Mg, Ti, halogen and an internal electron donor compound, wherein the Ti being in an amount ranging from 0.1 to 10% of the total weight of solid catalyst component; b) providing a coloring agent made from or containing at least a pigment; c) mixing the ZN catalyst particles and the coloring agent in a liquid hydrocarbon medium, thereby obtaining a slurry and d) feeding the slurry to a polymerization reactor and subjecting the reactor to polymerization conditions, thereby yielding the propylene polymer.

The Zigler-Natta catalyst composition of the present disclosure provides uniform polyethylene having a molecular weight in the range from 1 million g/mol to 12 million g/mol. The Zigler-Natta catalyst composition of the present disclosure comprises external electron donor selected from the group consisting of substituted silanediyl diacetate, trialkyl borate and tetraalkoxysilane.