Abstract: Olefin polymers are produced having a controlled amount of xylene soluble content. For example, polypropylene polymers can be produced having a relatively high xylene soluble content. The polymers are produced using particular external electron donors. The polymers can be produced without using a silicon-containing external electron donor.

Abstract: A process comprising polymerizing olefin monomers and optionally comonomers in a first reactor vessel, thereby forming a raw product stream comprising polymerized solids, unreacted monomer and optionally comonomer, the polymerized solids comprising olefin polymer, volatile organic compounds (VOC) and catalyst system. Then the polymerized solids are contacted with a catalyst poison selected from carbon monoxide, carbon dioxide, oxygen, water, alcohols, amines, or mixtures thereof, thereby forming a passivated stream. The passivated stream is maintained in an agitated state within a second reactor. The passivated stream within the second reactor is then contacted with a circulating gas comprising unreacted monomer for a residence time, thereby reducing the concentration of VOC in the polymerized solids by at least 10 wt % compared to the level before entering the second reactor, thereby forming a purified olefin polymer solids stream.

Abstract: A process comprising polymerizing propylene and an olefin comonomer selected from C2 or C4-C8 with a Ziegler Natta catalyst system and hydrogen in a single gas-phase reactor, to form a propylene polymer, at a temperature range of from 78 to 92° C. with a H2/C3 molar ratio of 0.005 to 0.25, the catalyst system comprising: a solid catalyst component comprising a transition metal compound, a Group 2 metal compound, an internal electron donor comprising a substituted phenylene aromatic di ester; an activity limiting agent; an organo-aluminum compound; and an external electron donor composition comprising at least one silane, wherein if the olefin comonomer is ethylene it is present in the propylene polymer in an amount from 1.0-7.0 wt % based on the total weight of the propylene polymer, and if the olefin comonomer is C4-C8, it is present in an amount from 1.0-15.0 mol % based on the total amount of the propylene polymer.

Abstract: A process comprising polymerizing olefin monomers and optionally comonomers in a first reactor vessel, thereby forming a raw product stream comprising polymerized solids, unreacted monomer and optionally comonomer, the polymerized solids comprising olefin polymer, volatile organic compounds (VOC) and catalyst system. Then the polymerized solids are contacted with a catalyst poison selected from carbon monoxide, carbon dioxide, oxygen, water, alcohols, amines, or mixtures thereof, thereby forming a passivated stream. The passivated stream is maintained in an agitated state within a second reactor. The passivated stream within the second reactor is then contacted with a circulating gas comprising unreacted monomer for a residence time, thereby reducing the concentration of VOC in the polymerized solids by at least 10 wt % compared to the level before entering the second reactor, thereby forming a purified olefin polymer solids stream.

Abstract: A process comprising polymerizing olefin monomers and optionally comonomers in a first reactor vessel, thereby forming a raw product stream comprising polymerized solids, unreacted monomer and optionally comonomer, the polymerized solids comprising olefin polymer, volatile organic compounds (VOC) and catalyst system. Then the polymerized solids are contacted with a catalyst poison selected from carbon monoxide, carbon dioxide, oxygen, water, alcohols, amines, or mixtures thereof, thereby forming a passivated stream. The passivated stream is maintained in an agitated state within a second reactor. The passivated stream within the second reactor is then contacted with a circulating gas comprising unreacted monomer for a residence time, thereby reducing the concentration of VOC in the polymerized solids by at least 10 wt % compared to the level before entering the second reactor, thereby forming a purified olefin polymer solids stream.

Abstract: A catalyst composition for the polymerization of propylene is provided. The catalyst composition includes one or more Ziegler-Natta procatalyst compositions having one or more transition metal compounds and one or more esters of aromatic dicarboxylic acid internal electron donors, one or more aluminum containing cocatalysts and a selectivity control agent (SCA). The SCA is a mixture of an activity limiting agent and a silane composition. The catalyst composition has a molar ratio of aluminum to total SCA from 0.5:1 to 4:1. This aluminum/SCA ratio improves polymerization productivity and the polymer production rate. The catalyst composition is self-extinguishing.

Abstract: The present invention relates to an improvement for gas-phase olefin polymerization process having relatively high bed bulk density. The improvement involves the use of mixed external electron donors when polymerizing propylene in a gas-phase reactor having a polymer bed with a bulk density greater than 128 kg/m3, optionally with one or more comonomers, wherein the mixed electron donor system comprises at least a first external electron donor and a second external electron donor, and wherein the first external electron donor is a carboxylate compound.

Abstract: A process comprising polymerizing propylene and an olefin comonomer selected from C2 or C4-C8 with a Ziegler “ Natta catalyst system and hydrogen in a single gas-phase reactor, to form a propylene polymer, at a temperature range of from 78 to 92° C. with a H2/C3 molar ratio of 0.005 to 0.25, the catalyst system comprising: a solid catalyst component comprising a transition metal compound, a Group 2 metal compound, an internal electron donor comprising a substituted phenylene aromatic di ester; an activity limiting agent; an organo-aluminum compound; and an external electron donor composition comprising at least one silane, wherein if the olefin comonomer is ethylene it is present in the propylene polymer in an amount from 1.0-7.0 wt % based on the total weight of the propylene polymer, and if the olefin comonomer is C4-C8, it is present in an amount from 1.0-15.0 mol % based on the total amount of the propylene polymer.

Abstract: A process comprising polymerizing olefin monomers and optionally comonomers in a first reactor vessel, thereby forming a raw product stream comprising polymerized solids, unreacted monomer and optionally comonomer, the polymerized solids comprising olefin polymer, volatile organic compounds (VOC) and catalyst system. Then the polymerized solids are contacted with a catalyst poison selected from carbon monoxide, carbon dioxide, oxygen, water, alcohols, amines, or mixtures thereof, thereby forming a passivated stream. The passivated stream is maintained in an agitated state within a second reactor. The passivated stream within the second reactor is then contacted with a circulating gas comprising unreacted monomer for a residence time, thereby reducing the concentration of VOC in the polymerized solids by at least 10 wt % compared to the level before entering the second reactor, thereby forming a purified olefin polymer solids stream.

Abstract: A composition is provided which comprises a propylene ethylene random copolymer having a melt flow rate (MFR) (as determined according to ASTM D1238, 230° C., 2.16 Kg) of less than 1 g/10 min, a xylene solubles content of less than 7% by weight, an ethylene content of from 3 to 5 percent by weight of the copolymer, and a value equal to or greater than 92 for the product of the Koenig B value times the % mm triads measured on the xylene insoluble fraction of the random copolymer obtained by the wet method. Pipes made from the composition demonstrate improved pressure endurance.

Abstract: Particles of a procatalyst composition having a particle size D50 from 19 microns to 30 microns. A polymerization process comprising halogenating, in the presence of a substituted phenylene aromatic diester, particles of a MagTi procatalyst precursor to form particles of a procatalyst composition having a particle size D50 from 19 microns to 30 microns; first contacting a propylene and optionally one or more first comonomers with a catalyst composition comprising the particles of the procatalyst composition in a first polymerization reactor to form an active propylene-based polymer; and second contacting the active propylene-based polymer with at least one second comonomer in a second polymerization reactor to form a propylene impact copolymer.

Abstract: A gas-phase process for making a propylene-based polymer in a fluidized-bed reactor, the reactor containing a fluidized bed including polymer product particles and a catalyst, the process having a set of quantitative criteria for maximum monomer partial pressure, maximum reactor temperature, and comonomer content(s) in the propylene-based polymer. The propylene-based polymer may be EBPT or BPRCP. The catalyst may include a catalyst/donor system comprising (1) a supported Ziegler-Natta pro-catalyst, (2) a co-catalyst, and (3) a mixed external electron donor system including (a) an activity limiting agent including at least one carboxylate ester functional group, and (b) a selectivity control agent.

Abstract: Particles of a procatalyst composition having a particle size D50 from 19 microns to 30 microns. A polymerization process comprising halogenating, in the presence of a substituted phenylene aromatic diester, particles of a MagTi procatalyst precursor to form particles of a procatalyst composition having a particle size D50 from 19 microns to 30 microns; first contacting a propylene and optionally one or more first comonomers with a catalyst composition comprising the particles of the procatalyst composition in a first polymerization reactor to form an active propylene-based polymer; and second contacting the active propylene-based polymer with at least one second comonomer in a second polymerization reactor to form a propylene impact copolymer.

Abstract: The present disclosure provides a process for producing propylene-based polymer. The process includes contacting, under polymerization conditions in a gas phase polymerization reactor, propylene monomer and optionally one or more comonomers with a Ziegler-Natta catalyst composition. The process includes maintaining the temperature of a reaction zone of the reactor at a temperature from greater than 72° C. to less than or equal to 85° C., and forming a propylene-based polymer having a molecular weight (Mw) greater than 100,000, and a Mz+1/Mz less than 2.20. The resultant propylene-based polymer is advantageous in fiber applications.

Abstract: A process for producing a propylene impact copolymer (ICOP), the process comprising the steps of feeding propylene and optionally one or more first comonomers into a first reactor; feeding into the first reactor a catalyst mixture; contacting the propylene with the catalyst mixture under first polymerization conditions to form an active propylene-based polymer; transferring at least a portion of the first reactor contents to a second reactor; feeding additional activity limiting agent, additional selectivity control agent and, optionally additional cocatalyst and one or more second comonomers into the second reactor; and maintaining the second reactor at a second reactor temperature in a range that is sufficient to allow copolymerization to form the propylene impact copolymer (ICOP), wherein the second reactor temperature is below 70° C.

Abstract: The present disclosure is directed to a process for producing olefin-based polymer in a gas phase polymerization reactor. The process includes forming a wet zone in the gas phase polymerization reactor. The wet zone is formed by maintaining a temperature less than or equal to the fluidizing medium dew point temperature+2° C. in a region of the reactor. The region is defined as the region extending from the distributor plate to 2.5 meters above the distributor plate. Injection of a high activity catalyst composition in the wet zone produces olefin-based having a settled bulk density greater than 23.5 lb/ft3.

Abstract: Particles of a procatalyst composition having a particle size D50 from 19 microns to 30 microns. A polymerization process comprising halogenating, in the presence of a substituted phenylene aromatic diester, particles of a MagTi procatalyst precursor to form particles of a procatalyst composition having a particle size D50 from 19 microns to 30 microns; first contacting a propylene and optionally one or more first comonomers with a catalyst composition comprising the particles of the procatalyst composition in a first polymerization reactor to form an active propylene-based polymer; and second contacting the active propylene-based polymer with at least one second comonomer in a second polymerization reactor to form a propylene impact copolymer.

Abstract: A gas-phase process for making a propylene-based polymer in a fluidized-bed reactor, the reactor containing a fluidized bed including polymer product particles and a catalyst, the process having a set of quantitative criteria for maximum monomer partial pressure, maximum reactor temperature, and comonomer content(s) in the propylene-based polymer. The propylene-based polymer may be EBPT or BPRCP. The catalyst may include a catalyst/donor system comprising (1) a supported Ziegler-Natta pro-catalyst, (2) a co-catalyst, and (3) a mixed external electron donor system including (a) an activity limiting agent including at least one carboxylate ester functional group, and (b) a selectivity control agent.

Abstract: A process for producing a propylene impact copolymer (ICOP), the process comprising the steps of feeding propylene and optionally one or more first comonomers into a first reactor; feeding into the first reactor a catalyst mixture; contacting the propylene with the catalyst mixture under first polymerization conditions to form an active propylene-based polymer; transferring at least a portion of the first reactor contents to a second reactor; feeding additional activity limiting agent, additional selectivity control agent and, optionally additional cocatalyst and one or more second comonomers into the second reactor; and maintaining the second reactor at a second reactor temperature in a range that is sufficient to allow copolymerization to form the propylene impact copolymer (ICOP), wherein the second reactor temperature is below 70° C.

Abstract: The present disclosure provides a process for producing propylene-based polymer. The process includes contacting, under polymerization conditions in a gas phase polymerization reactor, propylene monomer and optionally one or more comonomers with a Ziegler-Natta catalyst composition. The process includes maintaining the temperature of a reaction zone of the reactor at a temperature from greater than 72° C. to less than or equal to 85° C., and forming a propylene-based polymer having a molecular weight (Mw) greater than 100,000, and a Mz+1/Mz less than 2.20. The resultant propylene-based polymer is advantageous in fiber applications.