The present disclosure relates to olefin polymerization catalysts, and discloses a catalyst component for olefin polymerization or copolymerization and a preparation method therefor, and a catalyst and an application thereof. The catalyst component for olefin polymerization or copolymerization in the present disclosure comprises titanium element, magnesium element, an electron donor, an organic silicon polymer, and an inorganic oxide support, wherein the molecular composition of the organic silicon polymer is [R.sub.xSiO.sub.(4-x)/2].sub.m, wherein R is selected from alkyl, aryl, vinyl or oxygen, x is 0 or more and 2 or less, and the value of m makes the number-average molecular weight of the organic silicon polymer be 1×10.sup.3-1×10.sup.6 g/mol. The catalyst has the characteristics of high activity, good hydrogen-regulating copolymerization performance, high bulk density of resulting polymer powder, and a low content of fine powder in the polymer powder when applied to olefin polymerization, particularly to ethylene and α-olefin polymerization.

Supported chromium catalysts containing a solid oxide and 0.1 to 15 wt. % chromium, in which the solid oxide or the supported chromium catalyst has a particle size span from 0.5 to 1.4, less than 3 wt. % has a particle size greater than 100 μm, and less than 10 wt. % has a particle size less than 10 μm, can be contacted with an olefin monomer in a loop slurry reactor to produce an olefin polymer. Representative ethylene-based polymers produced using the chromium catalysts have a HLMI of 4 to 70 g/10 min, a density from 0.93 to 0.96 g/cm.sup.3, from 150 to 680 ppm solid oxide (such as silica), from 1.5 to 6.8 ppm chromium, and a film gel count of less than 15 catalyst particle gels per ft.sup.2 of 25 micron thick film and/or a gel count of less than or equal to 50 catalyst particles of greater than 100 μm per five grams of the ethylene polymer.

Supported chromium catalysts containing a solid oxide and 0.1 to 15 wt. % chromium, in which the solid oxide or the supported chromium catalyst has a particle size span from 0.5 to 1.4, less than 3 wt. % has a particle size greater than 100 μm, and less than 10 wt. % has a particle size less than 10 μm, can be contacted with an olefin monomer in a loop slurry reactor to produce an olefin polymer. Representative ethylene-based polymers produced using the chromium catalysts have a HLMI of 4 to 70 g/10 min, a density from 0.93 to 0.96 g/cm.sup.3, from 150 to 680 ppm solid oxide (such as silica), from 1.5 to 6.8 ppm chromium, and a film gel count of less than 15 catalyst particle gels per ft.sup.2 of 25 micron thick film and/or a gel count of less than or equal to 50 catalyst particles of greater than 100 μm per five grams of the ethylene polymer.

Catalyst systems and methods for making and using the same. A method of polymerizing olefins to produce a polyolefin polymer with a multimodal composition distribution, includes contacting ethylene and a comonomer with a catalyst system. The catalyst system includes a first catalyst compound and a second catalyst compound that are co-supported to form a commonly supported catalyst system. The first catalyst compound includes a compound with the general formula (C.sub.5H.sub.aR.sup.1.sub.b)(C.sub.5H.sub.cR.sup.2.sub.d)HfX.sub.2. The second catalyst compound includes at least one of the following general formulas:

##STR00001##

##STR00002##

In both catalyst systems, the R groups can be independently selected from any number of substituents, including, for example, H, a hydrocarbyl group, a substituted hydrocarbyl group, or a heteroatom group, among others.

Catalyst systems and methods for making and using the same. A method of polymerizing olefins to produce a polyolefin polymer with a multimodal composition distribution, includes contacting ethylene and a comonomer with a catalyst system. The catalyst system includes a first catalyst compound and a second catalyst compound that are co-supported to form a commonly supported catalyst system. The first catalyst compound includes a compound with the general formula (C.sub.5H.sub.aR.sup.1.sub.b)(C.sub.5H.sub.cR.sup.2.sub.d)HfX.sub.2. The second catalyst compound includes at least one of the following general formulas:

##STR00001##

##STR00002##

In both catalyst systems, the R groups can be independently selected from any number of substituents, including, for example, H, a hydrocarbyl group, a substituted hydrocarbyl group, or a heteroatom group, among others.

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.

This invention relates to high porosity (≧15%) and/or low pore diameter (PD<165 μm) propylene polymers and propylene polymerization processes using single site catalyst systems with supports having high surface area (SA≧400 m.sup.2/g), low pore volume (PV≦2 mL/g), a specific mean pore diameter range (PD=1-20 nm), and high average particle size (PS≧30 μm).

This invention relates to high porosity (≧15%) and/or low pore diameter (PD<165 μm) propylene polymers and propylene polymerization processes using single site catalyst systems with supports having high surface area (SA≧400 m.sup.2/g), low pore volume (PV≦2 mL/g), a specific mean pore diameter range (PD=1-20 nm), and high average particle size (PS≧30 μm).

The present invention relates to a polyethylene homo- or copolymer having improved wear properties. In particular, the invention relates to an ultra-high molecular weight polyethylene having improved wear properties prepared using a heterogeneous Ziegler catalyst system. Said polyethylene homo- or copolymer is characterized in that the abrasion index of said polyethylene is related to the elongational stress according to the formula (I): in which ES=elongational stress as measured according to ISO 11542-2:1998 AI=abrasion index, as measured according to ISO 15527:2010 where the reference material according to ISO 15527:2010 is set to 100; β<1.8; and −0.015<a<−0.017.

[00001]$\begin{array}{cc}\mathrm{AI}<\frac{\mathrm{ES}-\beta }{\alpha }& \left(I\right)\end{array}$