Abstract: Films or sheets of polypropylene, particularly biaxially oriented polypropylene (BOPP) films, exhibiting excellent physical and mechanical properties combined with good processing characteristics can be prepared from propylene polymers prepared in the presence of Ziegler-Natta catalysts comprising a succinate and a diether compound.

Abstract: A process for the gas-phase polymerization of ethylene or a mixture of ethylene and one or more 1 olefins in the presence of a polymerization catalyst system comprising the steps a) feeding a solid catalyst component, which was obtained by contacting at least a magnesium compound and a titanium compound, to a continuously operated apparatus and contacting the solid catalyst component with an aluminum alkyl compound at a temperature of from 0° C. to 70° C. in a way that the mean residence time of the solid catalyst component in contact with the aluminum alkyl compound is from 5 to 300 minutes; b) transferring the catalyst component formed in step a) into another continuously operated apparatus and prepolymerizing it with ethylene or a mixture of ethylene and one or more 1 olefins in suspension at a temperature of from 10° C. to 80° forming polymer in an amount of from 0.

Abstract: Preparing propylene polymer compositions comprising 50 to 90% by weight of a propylene (co)polymer, and 10 to 50% by weight of an ethylene copolymer. The polymerization process includes, in the presence of a catalyst system: (i) a first step of polymerizing propylene to produce the propylene (co)polymer; and (ii) a successive gas-phase polymerization step performed in the presence of the propylene (co)polymer, ethylene, and one or more ?-olefins to produce the ethylene copolymer. The catalyst system contains the product obtained by contacting: (a) a solid catalyst component comprising at least two internal electron donor compounds, a succinate and a 1,3-diether; (b) an aluminum hydrocarbyl compound, and (c) optionally, an external electron donor compound.

Abstract: The present disclosure relates to a process for the preparation of a porous propylene carried out in the presence of a catalyst system comprising (a) a Ziegler-Natta catalyst containing at least two electron donor compounds, one of which is present in an amount from 50 to 90% by mol with respect to the total amount of donors and selected from succinates, and the other being selected from 1,3 diethers, (b) an aluminum alkyl and comprising the following steps: i) contacting the catalyst components (a) and (b) for a period of time ranging from 1 to 60 minutes, at a temperature ranging from 35 to 55° C.; optionally, ii) pre-polymerizing with one or more olefins of formula CH2?CHR, where R is H or a C1-C10 hydrocarbon group, up to forming amounts of polymer from about 0.1 up to about 1000 g per gram of solid catalyst component (a); and iii) polymerizing propylene in the optional presence of minor amounts of ethylene and/or C4-C10 alpha olefins for producing the porous propylene (co)polymer.

Abstract: Propylene terpolymers are prepared by polymerizing propylene, ethylene and an alpha-olefin selected from the group of C4-C8 alpha-olefins in the presence of a catalyst system obtained by contacting a solid catalyst component comprising a magnesium halide, a titanium compound having at least a Ti-halogen bond and at least two electron donor compounds one of which being present in an amount from 40 to 90% by mol with respect to the total amount of donors and selected from succinates and the other selected from 1,3 diethers, an aluminum hydrocarbyl compound, and optionally an external electron donor compound.

Abstract: The present disclosure relates to a process for the preparation of a porous propylene carried out in the presence of a catalyst system comprising (a) a Ziegler-Natta catalyst containing at least two electron donor compounds, one of which is present in an amount from 50 to 90% by mol with respect to the total amount of donors and selected from succinates, and the other being selected from 1,3 diethers, (b) an aluminum alkyl and comprising the following steps: i) contacting the catalyst components (a) and (b) for a period of time ranging from 1 to 60 minutes, at a temperature ranging from 35 to 55° C.; optionally, ii) pre-polymerizing with one or more olefins of formula CH2?CHR, where R is H or a C1-C10 hydrocarbon group, up to forming amounts of polymer from about 0.1 up to about 1000 g per gram of solid catalyst component (a); and iii) polymerizing propylene in the optional presence of minor amounts of ethylene and/or C4-C10 alpha olefins for producing the porous propylene (co)polymer.

Abstract: A process and apparatus for producing olefin polymers are disclosed, comprising: a. polymerizing one or more olefins in the gas phase, in the presence of an olefin polymerization catalyst, whereby growing polymer particles flow along a cylindrically-shaped downward path in densified form under the action of gravity so as to form a densified bed of downward-flowing polymer particles b. allowing said polymer particles to flow through a restriction of the densified bed, such restriction being positioned in a restriction zone extending from the bed upward to a distance of 15% of the total height of the densified bed; and c. metering an antistatic agent through a feed line connected to the densified bed at a feed point being located in a feed zone extending from the top of the restriction upward, to a distance five times the diameter of the section of the densified bed above the restriction.

Abstract: A process for the gas-phase polymerization of ethylene or a mixture of ethylene and one or more 1 olefins in the presence of a polymerization catalyst system comprising the steps a) feeding a solid catalyst component, which was obtained by contacting at least a magnesium compound and a titanium compound, to a continuously operated apparatus and contacting the solid catalyst component with an aluminum alkyl compound at a temperature of from 0° C. to 70° C. in a way that the mean residence time of the solid catalyst component in contact with the aluminum alkyl compound is from 5 to 300 minutes; b) transferring the catalyst component formed in step a) into another continuously operated apparatus and prepolymerizing it with ethylene or a mixture of ethylene and one or more 1 olefins in suspension at a temperature of from 10° C. to 80° forming polymer in an amount of from 0.

Abstract: A polyolefin composition, particularly fit for the production of extrusion blow molded articles, comprising (a) a propylene-ethylene copolymer having a content of units deriving from ethylene of 4.0% by weight or higher, and (b) a nucleating agent and having a crystallization temperature (Tc) higher than 117° C. can be obtained by copolymerizing propylene and ethylene in the presence of a catalyst system obtained by contacting a solid catalyst component comprising a magnesium halide, a titanium compound having at least a Ti-halogen bond and at least two electron donor compounds one of which being present in an amount from 40 to 90% by mol with respect to the total amount of donors and selected from succinates and the other selected from 1,3 diethers, an aluminum hydrocarbyl compound, and optionally an external electron donor compound.

Abstract: Propylene terpolymers are prepared by polymerizing propylene, ethylene and an alpha-olefin selected from the group of C4-C8 alpha-olefins in the presence of a catalyst system obtained by contacting a solid catalyst component comprising a magnesium halide, a titanium compound having at least a Ti-halogen bond and at least two electron donor compounds one of which being present in an amount from 40 to 90% by mol with respect to the total amount of donors and selected from succinates and the other selected from 1,3 diethers, an aluminum hydrocarbyl compound, and optionally an external electron donor compound.

Abstract: A terpolymer obtainable by the step of copolymerizing propylene, ethylene and 1-hexene in the presence of a catalyst system comprising the product obtained by contacting the following components: (a) a solid catalyst component comprising a magnesium halide, a titanium and at least two electron donor compounds one selected from succinates and the other being selected from 1,3 diethers, (b) an aluminum hydrocarbyl compound, and (c) optionally an external electron donor compound. wherein in the terpolymer (i) the content of 1-hexene derived units ranges from 0.5 to 5.0 wt %; (ii) the content of ethylene derived units is higher than 1.4 t % and fulfils the following relation (1): C2<C6?0.2??(1) wherein C2 is the content of ethylene derived units wt % and C6 is the content of 1-hexene derived units wt %; (iii) the melting temperature ranging from 130° C. to 138° C.

Abstract: A process for the preparation of random copolymer of propylene containing up to 6.0% by weight of ethylene units, suitable for the manufacture of pipes, by copolymerizing propylene and ethylene in the presence of a catalyst system comprising the product obtained by contacting the following components: (a) a solid catalyst component comprising a magnesium halide, a titanium compound having at least a Ti-halogen bond and at least two electron donor compounds one of which being present in an amount from 40 to 90% by mol with respect to the total amount of donors and selected from succinates and the other being selected from 1,3 diethers, (b) an aluminum hydrocarbyl compound, and (c) optionally an external electron donor compound.

Abstract: A process and apparatus for producing olefin polymers are disclosed, comprising: a. polymerizing one or more olefins in the gas phase, in the presence of an olefin polymerization catalyst, whereby growing polymer particles flow along a cylindrically-shaped downward path in densified form under the action of gravity so as to form a densified bed of downward-flowing polymer particles b. allowing said polymer particles to flow through a restriction of the densified bed, such restriction being positioned in a restriction zone extending from the bed upward to a distance of 15% of the total height of the densified bed; and c. metering an antistatic agent through a feed line connected to the densified bed at a feed point being located in a feed zone extending from the top of the restriction upward, to a distance five times the diameter of the section of the densified bed above the restriction.

Abstract: Fibers comprising a polypropylene obtainable by a process comprising the steps of: (i) polymerizing propylene in the presence of a catalyst system comprising the product obtained by contacting the following components: (a) a solid catalyst component comprising a magnesium halide, a titanium compound having at least a Ti-halogen bond and at least two electron donor compounds one of which being present in an amount from 40 to 90% by mol with respect to the total amount of donors and selected from succinates and the other being selected from 1,3 diethers, (b) an aluminum hydrocarbyl compound, and (c) optionally an external electron donor compound, to obtain a polypropylene precursor having a melt flow rate MFR1; (ii) subjecting the thus-obtained polypropylene precursor to visbreaking to obtain a visbroken polypropylene having a melt flow rate MFR2; (iii) spinning the visbroken polypropylene obtained in the previous step; wherein MFR2 is comprised between from 15 to 40 g/10 min, the ratio MFR2/MFR1 is comprise

Abstract: A process for the preparation of propylene polymer compositions comprising from 50 to 90% by weight of a propylene (co)polymer fraction insoluble in xylene at 25° C., and from 10 to 50% by weight of an ethylene copolymer fraction soluble in xylene at 25° C., said process comprising: (i) a first step of polymerizing propylene in the optional presence of ethylene and/or C4-C10 alpha olefins, to produce a propylene (co)polymer being for at least 85% by weight insoluble in xylene at 25° C.

Abstract: A process for the preparation of high purity propylene polymers carried out in the presence of a catalyst comprising the product obtained by contacting: (a) a solid catalyst component comprising Mg, Ti and at least a first internal electron donor compound (HD) selected among the succinates and a second internal electron donor compound (2ID) selected among the 1,3-diethers, wherein the molar ratio of first internal donor over second internal donor 1ID:2ID is comprised between 4:6 and 9:1, with (b) an organo-aluminium compound, and optionally with (c) an external electron donor compound, said process being carried out at a temperature equal or higher than 78° C. and by employing a molar ratio of organo-aluminum compound over solid catalyst component (b):(a) of lower than 5.

Abstract: A process for the gas-phase copolymerization of: (a) propylene, (b) at least one C4-C8 ?-olefin, and (c) optionally ethylene, the process being carried out in a reactor having two interconnected polymerization zones, wherein the growing polymer particles flow through the first of said polymerization zones (riser) under fast fluidization conditions, leave said riser and enter the second of said polymerization zones (downcomer) through which they flow downward in a densified form, leave said downcomer and are reintroduced into said riser, thus establishing a circulation of polymer between the riser and the downcomer, the gas mixture present in the riser being at least partially prevented from entering the downcomer by introducing into the upper part of said downcomer a liquid barrier having a composition different from the gaseous mixture present in the riser and comprising at least one C4-C8 ?-olefin in a total amount of from 0.1% to 35% by mol.

Abstract: A propylene polymer composition comprising (percent by weight): A) 74%-84% of a propylene homopolymer having a Polydispersity Index (P.I.) value of from 4.6 to 10, a fraction insoluble in xylene at 25° C., higher than 90%, and a MFR L (Melt Flow Rate according to ISO 1133, condition L, i.e. 230° C. and 2.16 kg load) from 110 to 200 g/10 min; B) 16%-26%, of a copolymer of propylene with from 39% to 48%, of ethylene derived units; the composition having an intrinsic viscosity of the fraction soluble in xylene at 25° C. comprised between 2.7 and 4.0 dl/g; and a MFR L (Melt Flow Rate according to ISO 1133, condition L, i.e. 230° C. and 2.16 kg load) from 30 to 80 g/10 min.

Abstract: Films or sheets of polypropylene, particularly biaxially oriented polypropylene (BOPP) films, exhibiting excellent physical and mechanical properties combined with good processing characteristics can be prepared from propylene polymers prepared in the presence of Ziegler-Natta catalysts comprising a succinate and a diether compound.

Abstract: A process for the production of a corona-treated polyolefin film comprising the gas-phase polymerization of one or more ?-olefins in the presence of a polymerization catalyst and an antistatic agent having a molecular weight higher than 500, said antistatic agent being fed at any stage of the polymerization process in an amount from 30 to 500 ppm weight based on the weight of the produced polyolefin.