A heterophasic propylene polymeric material comprising a propylene-based polymer A, a propylene-based polymer B, and a propylene copolymer C, wherein the polymer A contains 80 mass % or more of monomer units derived from propylene and has a limiting viscosity of 2.0 dL/g or less, the polymer B contains 80 mass % or more of monomer units derived from propylene and has a limiting viscosity of 2.1-4.9 dL/g, the copolymer C contains monomer units derived from propylene and 30-55 mass % of monomer units derived from ethylene or the like and has a limiting viscosity of 1.5-4.5 dL/g, and the polymer A, the polymer B, and the copolymer C are respectively contained in ratios of 50-75 mass %, 5-20 mass %, and 5-40 mass %.

A heterophasic propylene polymeric material comprising a propylene-based polymer A, a propylene-based polymer B, and a propylene copolymer C, wherein the polymer A contains 80 mass % or more of monomer units derived from propylene and has a limiting viscosity of 2.0 dL/g or less, the polymer B contains 80 mass % or more of monomer units derived from propylene and has a limiting viscosity of 2.1-4.9 dL/g, the copolymer C contains monomer units derived from propylene and 30-55 mass % of monomer units derived from ethylene or the like and has a limiting viscosity of 1.5-4.5 dL/g, and the polymer A, the polymer B, and the copolymer C are respectively contained in ratios of 50-75 mass %, 5-20 mass %, and 5-40 mass %.

A method for producing an olefin polymerization catalyst includes bringing a solid catalyst component for olefin polymerization, a vinylsilane compound, an organosilicon compound, and an organoaluminum compound into contact with each other in an inert organic solvent under an inert gas atmosphere in the absence of a specific vinyl compound, wherein a washing treatment is not performed after the vinylsilane compound has been added to the reaction system, the solid catalyst component includes a magnesium compound, a titanium halide compound, and an electron donor compound that does not include a phthalic acid ester structure, and includes a diol skeleton, and the organosilicon compound does not include a vinyl group, and includes at least one group selected from an alkoxy group and an amino group.

A method for producing an olefin polymerization catalyst includes bringing a solid catalyst component for olefin polymerization, a vinylsilane compound, an organosilicon compound, and an organoaluminum compound into contact with each other in an inert organic solvent under an inert gas atmosphere in the absence of a specific vinyl compound, wherein a washing treatment is not performed after the vinylsilane compound has been added to the reaction system, the solid catalyst component includes a magnesium compound, a titanium halide compound, and an electron donor compound that does not include a phthalic acid ester structure, and includes a diol skeleton, and the organosilicon compound does not include a vinyl group, and includes at least one group selected from an alkoxy group and an amino group.

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.

##STR00001##

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.

##STR00001##

Provided is an olefin polymerization catalyst carrier with a general structure formula of Mg(OR.sup.I).sub.n(OR.sup.II).sub.2-n, wherein: 0≦n≦2, and R.sup.I and R.sup.II can be the same or different and are each independently selected from a C.sub.1-C.sub.20 hydrocarbon group. In the X-ray diffraction pattern of the catalyst carrier, there are a set of diffraction peaks in the range of a 2θ diffraction angle of 5°-15°, and the set of diffraction peaks contain 1-4 main diffraction peaks. Also disclosed is an olefin polymerization solid catalyst component which is prepared from the carrier Mg(OR.sup.I).sub.n(OR.sup.II).sub.2-n, a titanium compound, and at least one electron donor compound. In addition, also disclosed is an olefin polymerization catalyst containing the solid catalyst component, at least one organic aluminum compound, and optionally, an external electron donor compound.

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 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.