A process of producing a composition comprising a copolymer of ethylene and one or more C4-C8 α-olefins, may include copolymerizing the ethylene and the one or more C4-C8 α-olefins in the presence of a procatalyst and an alkylaluminum cocatalyst. The procatalyst may be a Ti-containing Ziegler Natta procatalyst and the polymerization may include the procatalyst and the alkylaluminum cocatalyst in amounts such that a molar ratio of Al:Ti ranges from about 0.5 to about 50.0.

Polyethylene powder satisfying (Requirements 1 and 2): (Requirement 1) a viscosity change rate of a gel under <Conditions for Preparing Gel> is −0.8 to 0.0 Pas/° C. under <Conditions for Measurement of Viscosity Change Rate>; <Conditions for Preparing Gel> 28 g liquid paraffin of 450 to less than 550 g/mol, 12 g polyethylene powder, and 0.4 g tetrakis[methylene(3,5-di-t-butyl-4-hydroxy-hydrocinnamate)]methane are kneaded at 200° C. and 50 rpm for 10 min using Labo Plastomill to obtain a gel; <Conditions for Measurement of Viscosity Change Rate> viscosity (Pas) is measured at a piston rate of 10 mm/min (shear rate of 266 s.sup.−1) at 200° C. and 230° C. in accordance with a flow characteristics test using a capillary die prescribed in JIS K7199, and a viscosity change rate (Pas/° C.):

[00001]$\begin{array}{cc}\begin{array}{c}\mathrm{viscosity}\\ \mathrm{change}\\ \mathrm{rate}\end{array}=\frac{\eta \left(266,230\right)-\eta \left(266,200\right)}{30}& \left(1\right)\end{array}$ wherein η(A,B) represents a viscosity found at shear rate of A s.sup.−1 and temperature of (Requirement 2) intrinsic viscosity (IV) is 1.5 to less than 18.0 dL/g.

Polyethylene powder satisfying (Requirements 1 and 2): (Requirement 1) a viscosity change rate of a gel under <Conditions for Preparing Gel> is −0.8 to 0.0 Pas/° C. under <Conditions for Measurement of Viscosity Change Rate>; <Conditions for Preparing Gel> 28 g liquid paraffin of 450 to less than 550 g/mol, 12 g polyethylene powder, and 0.4 g tetrakis[methylene(3,5-di-t-butyl-4-hydroxy-hydrocinnamate)]methane are kneaded at 200° C. and 50 rpm for 10 min using Labo Plastomill to obtain a gel; <Conditions for Measurement of Viscosity Change Rate> viscosity (Pas) is measured at a piston rate of 10 mm/min (shear rate of 266 s.sup.−1) at 200° C. and 230° C. in accordance with a flow characteristics test using a capillary die prescribed in JIS K7199, and a viscosity change rate (Pas/° C.):

[00001]$\begin{array}{cc}\begin{array}{c}\mathrm{viscosity}\\ \mathrm{change}\\ \mathrm{rate}\end{array}=\frac{\eta \left(266,230\right)-\eta \left(266,200\right)}{30}& \left(1\right)\end{array}$ wherein η(A,B) represents a viscosity found at shear rate of A s.sup.−1 and temperature of (Requirement 2) intrinsic viscosity (IV) is 1.5 to less than 18.0 dL/g.

The present disclosure provides a method for polymerizing ultra-high molecular weight polyethylene and a method for preparing the catalyst thereof by reacting a main catalyst, a cocatalyst mixed with two or more types of organoaluminum, and an organosilane compound in the polymerization of ultra-high molecular weight polyethylene to have high activity, high bulk density, and high molecular weight while simultaneously having low particle agglomeration.

A process of preparing a solid catalyst component for the production of polypropylene includes a) dissolving a halide-containing magnesium compound in a mixture, the mixture including an epoxy compound, an organic phosphorus compound, and a hydrocarbon solvent to form a homogenous solution; b) treating the homogenous solution with an organosilicon compound during or after the dissolving step; c) treating the homogenous solution with a first titanium compound in the presence of a first non-phthalate electron donor, and an organosilicon compound, to form a solid precipitate; and d) treating the solid precipitate with a second titanium compound in the presence of a second non-phthalate electron donor to form the solid catalyst component, where the process is free of carboxylic acids and anhydrides.

A process of preparing a solid catalyst component for the production of polypropylene includes a) dissolving a halide-containing magnesium compound in a mixture, the mixture including an epoxy compound, an organic phosphorus compound, and a hydrocarbon solvent to form a homogenous solution; b) treating the homogenous solution with an organosilicon compound during or after the dissolving step; c) treating the homogenous solution with a first titanium compound in the presence of a first non-phthalate electron donor, and an organosilicon compound, to form a solid precipitate; and d) treating the solid precipitate with a second titanium compound in the presence of a second non-phthalate electron donor to form the solid catalyst component, where the process is free of carboxylic acids and anhydrides.

The present disclosure is generally directed to polyolefin polymers, such as polypropylene homopolymers, and propylene-ethylene copolymers that have improved flow properties. In one embodiment, the polymers can be produced using a solid catalyst component that includes a) dissolving a halide-containing magnesium compound in a mixture, the mixture including an epoxy compound, an organic phosphorus compound, and a hydrocarbon solvent to form a homogenous solution; b) treating the homogenous solution with an organosilicon compound during or after the dissolving step; c) treating the homogenous solution with a first titanium compound in the presence of a first non-phthalate electron donor, and an organosilicon compound, to form a solid precipitate; and d) treating the solid precipitate with a second titanium compound in the presence of a second non-phthalate electron donor to form the solid catalyst component, where the process is free of carboxylic acids and anhydrides.

The present disclosure is generally directed to polyolefin polymers, such as polypropylene homopolymers, and propylene-ethylene copolymers that have improved flow properties. In one embodiment, the polymers can be produced using a solid catalyst component that includes a) dissolving a halide-containing magnesium compound in a mixture, the mixture including an epoxy compound, an organic phosphorus compound, and a hydrocarbon solvent to form a homogenous solution; b) treating the homogenous solution with an organosilicon compound during or after the dissolving step; c) treating the homogenous solution with a first titanium compound in the presence of a first non-phthalate electron donor, and an organosilicon compound, to form a solid precipitate; and d) treating the solid precipitate with a second titanium compound in the presence of a second non-phthalate electron donor to form the solid catalyst component, where the process is free of carboxylic acids and anhydrides.

A process of producing a composition comprising a copolymer of ethylene and one or more C4-C8 α-olefins, may include copolymerizing the ethylene and the one or more C4-C8 α-olefins in the presence of a procatalyst and an alkylaluminum cocatalyst. The procatalyst may be a Ti-containing Ziegler Natta procatalyst and the polymerization may include the procatalyst and the alkylaluminum cocatalyst in amounts such that a molar ratio of Al:Ti ranges from about 0.5 to about 50.0.

A process of producing a composition comprising a copolymer of ethylene and one or more C4-C8 α-olefins, may include copolymerizing the ethylene and the one or more C4-C8 α-olefins in the presence of a procatalyst and an alkylaluminum cocatalyst. The procatalyst may be a Ti-containing Ziegler Natta procatalyst and the polymerization may include the procatalyst and the alkylaluminum cocatalyst in amounts such that a molar ratio of Al:Ti ranges from about 0.5 to about 50.0.