Abstract: A polyethylene composition made from or containing a polyethylene, having the following features: 1) a density from about 0.930 to about 0.945 g/cm3, determined according to ISO 1183 at 23° C.; 2) a ratio of MIF/MIP from about 10 to less than about 30; 3) a MIF from about 3 to about 25 g/10 min.; 4) a Mz equal to or greater than about 1,500,000 g/mol; and 5) a long-chain branching index, LCBI, equal to or lower than about 0.55, wherein the LCBI is the ratio of the measured mean-square radius of gyration Rg, measured by GPC-MALLS, to the mean-square radius of gyration for a linear PE having the about same molecular weight of 1,000,000 g/mol.

Abstract: The present disclosure relates to pipes comprising bimodal high molecular weight high density polyethylene which has been extruded in the presence of one or more organic peroxides that are present in an amount ranging from 30 ppm to 200 ppm. The pipe has an improved long-term hydrostatic strength. Also provided are methods for preparing pipes having these characteristics.

Abstract: A polyethylene composition made from or containing a polyethylene, having the following features: 1) a density from about 0.930 to about 0.945 g/cm3, determined according to ISO 1183 at 23° C.; 2) a ratio of MIF/MIP from about 30 to about 55; 3) a MIF from about 3 to about 25 g/10 min.; 4) a Mz equal to or greater than about 1,500,000 g/mol; and 5) a long-chain branching index, LCBI, equal to or lower than about 0.55, wherein the LCBI is the ratio of the measured mean-square radius of gyration Rg, measured by GPC-MALLS, to the mean-square radius of gyration for a linear PE having about the same molecular weight of 1,000,000 g/mol.

Abstract: A polyethylene composition made from or containing a polyethylene, having the following features: 1) a density from about 0.930 to about 0.945 g/cm3, determined according to ISO 1183 at 23° C.; 2) a ratio of MIF/MIP from about 30 to about 55; 3) a MIF from about 3 to about 25 g/10 min.; 4) a Mz equal to or greater than about 1,500,000 g/mol; and 5) a long-chain branching index, LCBI, equal to or lower than about 0.55, wherein the LCBI is the ratio of the measured mean-square radius of gyration Rg, measured by GPC-MALLS, to the mean-square radius of gyration for a linear PE having about the same molecular weight of 1,000,000 g/mol.

Abstract: A polyethylene composition made from or containing a polyethylene, having the following features: 1) a density from about 0.930 to about 0.945 g/cm3, determined according to ISO 1183 at 23° C.; 2) a ratio of MIF/MIP from about 10 to less than about 30; 3) a MIF from about 3 to about 25 g/10 min.; 4) a Mz equal to or greater than about 1,500,000 g/mol; and 5) a long-chain branching index, LCBI, equal to or lower than about 0.55, wherein the LCBI is the ratio of the measured mean-square radius of gyration Rg, measured by GPC-MALLS, to the mean-square radius of gyration for a linear PE having the about same molecular weight of 1,000,000 g/mol.

Abstract: Polyethylene composition for injection molding with a beneficial balance of environmental stress cracking resistance and impact resistance in combination with low warpage and beneficial processing behavior, said composition having the following features: 1) density of 0.945 g/cm3 or higher; 2) MIE from 1 to 30 g/10 min.; 3) ratio MIF/MIE from 15 to 30; 4) ER values from 0.40 to 0.52.

Abstract: A film comprising a polymer blend of: (a) 0.15 to 0.8 wt % of an LDPE having an MI of 0.1 to 0.6 dg/min; and (b) 99.2 to 99.85 wt % of an LLDPE produced with a single-site catalyst comprising a metallocene and having a haze (HZlldpe), dart impact (DIlldpe), MD-Tear (MDTlldpe), and a slice long chain branching index of at least 0.90 for any portion of the composition having a molecular weight of 100,000 or above, wherein the film has a haze (HZblend), a dart impact (DIblend), and an MD-Tear (MDTblend), and HZblend=a*HZlldpe, where a is 0.20 to 0.70; DIblend=b*DIlldpe, where b is 0.9 to 1.3; and MDTblend=c*MDTlldpe, where c is 0.8 to 1.1.

Abstract: Embodiments of the present disclosure relate to a method of preparing polyethylene compositions comprising polymerizing ethylene in a first gas-phase reactor and polymerizing ethylene in a second gas-phase reactor in the presence of hydrogen; wherein at least one of the first or second gas-phase reactors comprises a first and second polymerization zone; wherein a hydrogen pressure of the first and second polymerization zones are different such that at least a portion of the second ethylene cycles through the first and second polymerization zones and a gas mixture of each polymerization zone is partially or totally prevented from entering the other zone.

Abstract: Disclosed herein are blended polymer compositions having a polyethylene first resin and a mLLDPE resin. The polyethylene first resin have a density of at least 0.926 g/cm3; and the mLLDPE resin has a density of between about 0.910 to about 0.925 g/cm3 and a melt index ranging from about 0.05 to about 5. The amount of the mLLDPE is less than about 20 weight percent based on the weight of the polyethylene first resin and mLLDPE resin; and the mLLDPE resin has a narrower molecular weight distribution than the polyethylene first resin.

Abstract: Embodiments of the present disclosure relate to a method of preparing polyethylene compositions comprising polymerizing ethylene in a first gas-phase reactor and polymerizing ethylene in a second gas-phase reactor in the presence of hydrogen; wherein at least one of the first or second gas-phase reactors comprises a first and second polymerization zone; wherein a hydrogen pressure of the first and second polymerization zones are different such that at least a portion of the second ethylene cycles through the first and second polymerization zones and a gas mixture of each polymerization zone is partially or totally prevented from entering the other zone.

Abstract: An article that is made of a film a film having a narrow angle scattering (NAS) of greater than 40, a drop dart impact of greater than 100 grams, and a blocking of less than 40 g/16 in2. In particular, the film in made of a blend of: (a) a LDPE, (b) a LLDPE produced with a single-site catalyst; and (c) one or more anti-block additives.

Abstract: Extruded articles, particularly films, comprising an ethylene polymer obtained by a polymerization process carried out in the presence the products 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 optionally one or more internal electron donor compounds, (b) an aluminum hydrocarbyl compound, (c) optionally an external electron donor compound, and (d) a polyalcohol partially esterified with carboxylic acids with alkyl groups having at least 10 carbon atoms.

Abstract: A film comprising a polymer blend of: (a) 0.15 to 0.8 wt % of an LDPE having an MI of 0.1 to 0.6 dg/min; and (b) 99.2 to 99.85 wt % of an LLDPE produced with a single-site catalyst comprising a metallocene and having a haze (HZlldpe), dart impact (DIlldpe), MD-Tear (MDTlldpe), and a slice long chain branching index of at least 0.90 for any portion of the composition having a molecular weight of 100,000 or above, wherein the film has a haze (HZblend), a dart impact (DIblend), and an MD-Tear (MDTblend), and HZblend=a*HZlldpe, where a is 0.20 to 0.70; DIblend=b*DIlldpe, where b is 0.9 to 1.3; and MDTblend=c*MDTlldpe, where c is 0.8 to 1.

Abstract: Disclosed is a method for making LLDPE grades having different xylene solubles or hexane extractables with the same Ziegler-Natta catalyst by varying the amount of alkylaluminum used for polymerization. The method comprises copolymerizing ethylene with a C3-10 ?-olefin in the presence of a Ziegler-Natta catalyst, an alkylaluminum, and an electron donor; determining the dependency of the xylene solubles or hexane extractables on the alkylaluminum/electron donor ratio; and adjusting the alkylaluminum/electron donor ratio to achieve a desired xylene solubles or hexane extractables.

Abstract: Disclosed is a process for making a linear low density polyethylene (LLDPE) having low gels. The process comprises copolymerizing ethylene with one or more C3-10 ?-olefins to produce an LLDPE resin which has a gel defect area less than 25 ppm. The copolymerization is performed in the presence of a Ziegler-Natta catalyst which comprises an MgCl2 support, a Ti(IV) complex, and a cyclic ether as an internal electron donor. The Ziegler-Natta catalyst has an Mg/Ti molar ratio greater than or equal to 7.

Abstract: Disclosed is an adhesive composition. The adhesive composition comprises a maleated polyolefin and an LLDPE. The LLDPE is made by a Ziegler-Natta catalyst which comprises a MgCl2 support, a Ti(IV) complex, and an electron donor. The catalyst has an Mg/Ti molar ratio greater than or equal to 7. Preferably, the Ti(IV) complex is TiCl4, and the electron donor is tetrahydrofuran. Preferably, the adhesive comprises from 35 to 95 wt % of the LLDPE and 5 to 65 wt % of maleated polyolefin.

Abstract: A film comprising a polymer blend of 0.3 to 0.8 wt % LDPE; and 99.2 to 99.7 wt % LLDPE, the LDPE having an MI of 0.1 to 0.6 dg/min, and the blend having a slice long chain branching of at least 0.96 for any portion of the composition having a molecular weight of 100,000 or above, wherein the film is formed from an extrudate of the blend.

Abstract: Disclosed is a multimodal, high density, homopolyethylene barrier resin. The resin is preferably made by a multistage process. The process comprises a first stage in which ethylene is homopolymerized in the presence of a Ziegler-Natta catalyst, organoaluminum cocatalyst, alkoxysilane modifier, and hydrogen. The reaction mixture from the first stage is devolatilized to remove all or substantially all of the hydrogen. The polymerization continues in a second stage wherein ethylene is added to the devolatilized reaction mixture to produce the barrier resin. The barrier resin provides films with improved barrier properties.

Abstract: Disclosed is a multimodal, high density, homopolyethylene barrier resin. The resin is preferably made by a multistage process. The process comprises a first stage in which ethylene is homopolymerized in the presence of a Ziegler-Natta catalyst, organoaluminum cocatalyst, alkoxysilane modifier, and hydrogen. The reaction mixture from the first stage is devolatilized to remove all or substantially all of the hydrogen. The polymerization continues in a second stage wherein ethylene is added to the devolatilized reaction mixture to produce the barrier resin. The barrier resin provides films with improved barrier properties.

Abstract: A polyolefin composition is disclosed. The composition comprises a single-site linear low density polyethylene (mLLDPE) and an elastoplastic polypropylene. The elastoplastic polypropylene is present in an amount sufficient to improve the processability and physical property of the mLLDPE. The composition preferably comprises from 70 wt % to 99 wt % of mLLDPE and from 1 wt % to 30 wt % of the elastoplastic polypropylene. The polyolefin composition of the invention exhibits improved bubble stability in the blown film extrusion compared to the mLLDPE and improved film properties such as tear strength and modulus compared to the traditional blend of mLLDPE and low density polyethylene.