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.

The present invention relates to a process for preparing a procatalyst for polymerization of olefins, said process comprising contacting a magnesium-containing support with a halogen-containing titanium compound, an internal electron donor being a substituted 1,2-phenylene aromatic diester compound.

The invention relates to a process for preparing a solid support for a procatalyst suitable for preparing a catalyst composition for olefin polymerization, said process for preparing said solid support comprising reacting a compound R.sup.4.sub.zMgX.sup.4.sub.2-z with a silane compound Si(OR.sup.5).sub.4-n(R.sup.6).sub.n in a solvent and mixing the resulting mixture with a mixing device and at a certain mixing speed in order to give a solid support Mg(OR.sup.1).sub.xX.sup.1.sub.2-x said solid support obtained having an average particle size of at most 17 μm, preferably at most 16 or 14 μm, more preferably at most 12 μm. The invention further relates to a solid support, a process for preparing a procatalyst and said procatalyst as well as polyolefins obtained using said procatalyst.

Non-phthalate compounds having a structure represented by the general formula ##STR00001##
and a method for using same are provided as electron donors in the Ziegler-Natta type catalyst system for the homopolymerization or copolymerization of alpha olefins. The non-phthalate compounds may be used in the preparation of the solid catalyst component, thus serving as “internal electron donors”, or employed during or prior to polymerization as “external electron donors,” and therefore they can be used to prepare phthalate-free polyolefins.

The present disclosure provides an article of manufacture made from or containing a propylene-based terpolymer, having (i) ethylene-derived units in the range from about 0.5 wt. % to about 1.8 wt. %; (ii) 1-butene-derived units in the range from about 1.5 wt. % to about 2.5 wt. %; (iii) a ratio of C.sub.2 wt %/C.sub.4 wt % in the range from about 0.40 to about 0.80, wherein C.sub.2 wt % is the weight percent of ethylene-derived units and C.sub.4 wt % is the weight percent of 1-butene-derived units; (iv) a melt flow rate in the range from about 30 g/10 min to about 80 g/10 min; (v) a xylene soluble fraction at 25° C. lower than about 5.0 wt. %; and (vi) a melting point higher than about 140° C.

The article can be a container, which can be used for food applications.

A method for producing a propylene-based block copolymer produces a propylene-based copolymer that exhibits excellent stereoregularity, rigidity, and impact resistance in a convenient and efficient manner while achieving high polymerization activity. The method for producing a propylene-based block copolymer includes bringing a catalyst into contact with propylene, or propylene and an α-olefin, and bringing an electron donor compound into contact with the resulting product to produce a propylene-based block copolymer, the catalyst including a solid catalyst component that includes titanium, magnesium, a halogen, and an internal electron donor compound, a specific organoaluminum compound, and a specific external electron donor compound.

The invention relates to a process for producing a polypropylene composition by sequential polymerization said polypropylene composition having low sealing initiation temperature (SIT) and high melting point (Tm), presenting thus a broad sealing window.

A solid catalyst component for polymerization of olefins is disclosed which can produce a polymer having low stickiness (tackiness) of polymer particles, excellent flowability, and favorable particle size distribution. The solid catalyst component for polymerization of olefins includes titanium, magnesium, a halogen atom and an internal electron donor, wherein the solid catalyst component has a multimodal pore volume distribution measured by a mercury intrusion method and has one or more peak tops in each of a pore radius range from 0.002 μm to 1 μm and a pore radius range from larger than 1 μm to 30 μm or smaller, and a ratio represented by pore volume V1 derived from pores in the radius range from 0.002 μm to 1 μm/pore volume V2 derived from pores in the radius range from larger than 1 μm to 30 μm or smaller is 0.30 to 0.65.

A solid catalyst component for polymerization of olefins is disclosed which can produce a polymer having low stickiness (tackiness) of polymer particles, excellent flowability, and favorable particle size distribution. The solid catalyst component for polymerization of olefins includes titanium, magnesium, a halogen atom and an internal electron donor, wherein the solid catalyst component has a multimodal pore volume distribution measured by a mercury intrusion method and has one or more peak tops in each of a pore radius range from 0.002 μm to 1 μm and a pore radius range from larger than 1 μm to 30 μm or smaller, and a ratio represented by pore volume V1 derived from pores in the radius range from 0.002 μm to 1 μm/pore volume V2 derived from pores in the radius range from larger than 1 μm to 30 μm or smaller is 0.30 to 0.65.

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.