Abstract: The present invention relates to monohydroindacenyl complexes as active catalytic components in the copolymerization of ethylene. The complexes are suitable for direct preparation of ethylene copolymers having a narrow molecular distribution as well as the desired levels of low density and preferably a predetermined value of glass transition temperature Tg. The produced copolymers showing improved elastomeric performance can be prepared in a single step during polymerization reaction, thus avoiding a blending step following the polymerization step.

Abstract: The present invention provides polymerization catalyst compositions employing half-metallocene compounds with a heteroatom-containing ligand bound to the transition metal. Methods for making these hybrid metallocene compounds and for using such compounds in catalyst compositions for the polymerization and copolymerization of olefins are also provided.

Abstract: A solid catalyst component for olefin polymerization comprising a titanium atom, a magnesium atom, a halogen atom, and a cycloheptapolyenedicarboxylic diester; a production method of the solid catalyst component, by contacting with one another a titanium compound, a magnesium compound, and the cycloheptapolyenedicarboxylic diester; a production method of a solid catalyst, by contacting the solid catalyst component with an organoaluminum compound; and a production method of an olefin polymer by polymerizing an olefin in the presence of the solid catalyst.

Abstract: Provided are transition metal catalytic systems for preparing ethylene homopolymers or copolymers of ethylene with ?-olefins. More specifically, provided are Group 4 transition metal catalysts, which is characterized in that the catalyst comprises around the Group 4 transition metal a cyclopentadiene derivative, and at least one aryloxide ligand(s) having a fluorenyl group or a derivative thereof (which is ready to be substituted at 9-position) that functions as an electron donor and serves to stabilize the catalytic system by surrounding an oxygen atom that links the ligand to the transition metal at ortho-position, and there is no cross-linkage between the ligands; catalytic systems comprising such transition metal catalyst and aluminoxane cocatalyst or boron compound cocatalyst; and processes for preparing ethylene homopolymers or copolymers of ethylene with ?-olefins by using the same.

Abstract: The invention generally provides for methods for controlling polymer properties. In particular, invention provides for methods for controlling the comonomer composition distribution of polyolefins such as ethylene alpha-olefin copolymers by altering at least one or more of the following parameters: the molar ratio of hydrogen to ethylene, the molar ratio of comonomer to ethylene, the partial pressure of ethylene, and the reactor temperature without substantially changing the density and/or the melt index of the copolymer.

Abstract: In a process for producing a propylene copolymer, propylene and at least one olefin monomer selected from ethylene and alpha olefins having 4 to 20 carbon atoms are contacted with a catalyst system comprising (a) a catalyst precursor comprising an organometallic compound and (b) an activator comprising a fluoroarylborate anion represented by the formula: Ct+[B(Ar)x(R)n]? where Ct+ is a cation capable of extracting an alkyl group from, or breaking a carbon-metal bond of, the organometallic compound; Ar is a fluorophenyl group; R is a fluoronaphthyl group and each of x and n is 1, 2, or 3, with the proviso that the sum of x+n=4.

Abstract: The present invention relates to a method for the production of an ethylene/propylene/diene copolymer by means of solution polymerization, and more specifically one for a copolymer whose main components are ethylene, propylene and diene monomers using a catalyst of a transition metal coordination compound; the constituent components and characteristics of the copolymer being as follows. The catalyst composition provided by the present invention, which is used to produce a copolymer of which (a) the ethylene content is from 30 wt. % to 80 wt. %, (b) the propylene content is from 19.9% to 60 wt. % and (c) the diene content is from more than 0 wt. % to 15 wt.

Abstract: This invention relates to a process for the preparation of an olefin polymerization catalyst, to the use of the catalyst in olefin polymerization and to the catalyst and polymers obtained. In particular, the invention relates to the preparation of a catalyst comprising an organometallic compound of a transition metal of Group 3 to 10 of the Periodic Table (IUPAC) by a semi-continuous or continuous process.

Abstract: Disclosed herein is a curable composition excellent in workability, adhesion properties, rubber-like properties, storage stability, and quick curability. The curable composition comprises (A) a crosslinkable silyl group-containing organic polymer and (B) a (meth)acrylic polymer obtained by polymerizing a (meth)acrylic monomer having a polymerizable unsaturated bond in the presence of a metallocene compound and a crosslinkable silyl group-containing thiol compound, at least one end of the (meth)acrylic polymer being bonded to a residue, —S—R3 (where R3 represents a group having a crosslinkable silyl group) obtained by removing a hydrogen atom from the crosslinkable silyl group-containing thiol compound.

Abstract: The present invention relates to a process for preparing transition metal compounds, in particular ansa-bisindenyl-metallocenes having nitrogen, phosphor, sulfur or oxygen comprising substituents, the corresponding transition metal compounds themselves and their use in the preparation of catalyst systems and also the use of the catalyst systems in the polymerization and copolymerization of olefins.

Abstract: The present invention provides dual catalyst systems containing a metallocene catalyst and a hydrogen scavenging catalyst, and polymerization processes employing these dual catalyst systems. Due to a reduction in hydrogen levels in the polymerization processes, olefin polymers produced from these polymerization processes may have a higher molecular weight, a lower melt index, and higher levels of unsaturation.

Abstract: The present invention relates to a copolymer which contains 3-methylbut-1-ene as a comonomer and which contains ethene or propene as a further monomer, the proportion of the incorporated 3-methylbut-1-ene being 0.1 to 40 mol %, and to a process for preparing such copolymers, the polymerization being performed in the presence of a catalyst which comprises at least one cyclopentadienyl group.

Abstract: Disclosed is a method of producing a polyolefin composition comprising contacting a metallocene pre-catalyst, co-catalyst, and a stoichiometric excess of a metal alkyl; adding a first olefin monomer; and polymerizing the first monomer for a time sufficient to form the polyolefin. The method allows for the use of minimum amounts of activating co-catalyst and metallocene pre-catalyst. Also disclosed is a method of producing a block polyolefin composition comprising contacting a metallocene pre-catalyst, a co-catalyst, and a stoichiometric excess of a metal alkyl; adding a first olefin monomer; polymerizing the first monomer for a time sufficient to form the polyolefin; adding a second monomer; and polymerizing the second olefin monomer for a time sufficient to form said block polyolefin composition. Also disclosed are amorphous atactic polymer and copolymer compositions made according to the present invention.

Abstract: The method of promoting olefin polymerization uses a nanoparticle filler to increase the activity of a metallocene catalyst for in situ polymerization of polyolefins. The filler may be nanoparticles of manganese, or nanoparticles of manganese-doped titanium dioxide. The method includes the steps of (a) mixing a metallocene catalyst, e.g., zirconocene dichloride, with nanoparticles of the filler in an organic solvent, e.g., toluene, in a reactor to form a reaction mixture; (b) immersing the reactor in a temperature bath for a period of time sufficient to bring the mixture to an optimal polymerization reaction temperature; (c) adding monomer to the mixture in the reactor; (d) adding methylaluminoxane (MAO) as a co-catalyst to the reaction mixture to initiate polymerization; and (e) quenching the polymerization, e.g., by adding methanol containing 5% hydrochloric acid by volume to the reactor.

Abstract: Provided is an ?-olefin polymer having an excellent balance between a molecular weight and a melting point, which is a polymer of one or more kinds of ?-olefins having 20 to 40 carbon atoms, and which meets the following requirements (1) to (4): (1) the ?-olefin polymer has a molecular weight distribution (Mw/Mn) determined from its weight average molecular weight (Mw) and number average molecular weight (Mn) in terms of polystyrene measured by a GPC method of 2 or less, and has an Mw of 5,000 or less; (2) measurement of a melting point (Tm) of the ?-olefin polymer with DSC shows one melting peak, a melting heat absorption (AH) calculated from an area of the melting peak is 20 J/g or more, and the melting peak has a half value width of 10° C. or less; (3) when the Mw falls within a range of 1,000 to 5,000 and an average number of carbon atoms (Cn) of the ?-olefins falls within a range of 20 to 40, the Mw, the Cn, and the Tm measured with the DSC satisfy the relationship, 0.0025×Mw+(Cn×3.3812?29.5)?Tm?0.

Abstract: A process for obtaining atactic 1-butene polymer optionally containing at least one comonomer selected from ethylene, propylene or an alpha-olefin of formula CH2?CHRo, wherein Ro is a linear or branched C3-C20 alkyl group, comprising the step of polymerizing 1-butene and optionally ethylene, propylene or said alpha-olefin, in the presence of a catalyst system obtainable by contacting: a) at least one metallocene compound of formula (I) in its meso or meso-like form wherein M is an atom of a transition metal; p is an integer from 0 to 3; X, same or different, is a hydrogen atom, a halogen atom, or a hydrocarbon group; L is a divalent C1-C40 hydrocarbon radical optionally containing heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements; R1 and R2, are C1-C40 hydrocarbon radicals; T, equal to or different from each other, is a moiety of formula (IIa) or (IIb): wherein R3 is a C1-C40 hydrocarbon radical; R4 and R6, are hydrogen atoms or C1-C40 hydrocarbon radicals; R5 is a

Abstract: The present invention discloses a catalyst system based on a metallocene catalyst component and a new single site catalyst component for the production in a single reactor of improved polyolefins having a bimodal molecular weight distribution.

Abstract: Halogen substituted metallocene compounds are described and comprise one or more monocyclic or polycyclic ligands that are pi-bonded to the metal atom and include at least one halogen substituent directly bonded to an sp2 carbon atom at a bondable ring position of the ligand, wherein the or at least one ligand has one or more ring heteroatoms in its cyclic structure. When combined with a suitable activator, these compounds show activity in the polymerization of olefins, such as ethylene and propylene.

Abstract: A metallocene compound with the 4- and 7-positions on the indenyl moiety possessing large aromatic substituents is prepared in accordance with a method which produces substantially 100 percent racemic isomer. Advantageously, polymerization catalysts including the metallocene of the invention provide superior olefin polymerization results.

Abstract: This invention relates to new transition metal complexes for use in olefin polymerization and oligomerization. The active complex is a pyridine amide having a metallocenyl substituent as part of the ligand structure. The invention also relates to novel precursors for the ligand systems of such complexes obtained from metallocenyl-substituted pyridine compounds through sequences involving addition-condensation or lithium-halogen exchange (with subsequent metathesis) reactions.

Abstract: Multi-branched polypropylene having a g? of less than 1.00.

Abstract: A composition that may be useful for thermoforming and blow molding applications comprises a metallocene catalyzed propylene-ethylene random copolymer having an ethylene content of from about 0.1 to about 1.5 weight percent based on the copolymer, and exhibits a flexural modulus of at least about 1,100 MPa, a haze of less than about 40 percent, a melt flow of from about 1.0 dg/min to about 3.0 dg/min, and a xylene solubles content from about 0.2 weight percent to about 1.0 weight percent based on the copolymer. A process for preparing the copolymer and articles prepared therefrom are also disclosed. The composition's properties may make it particularly desirable for applications such as bottles, syringes and containers such as those used for food and medical purposes.

Abstract: A solution process for polymerizing one or more ?-olefins of formula CH2?CHR, where R is H or an alkyl radical C1-12, to produce a polyolefin soluble in the reaction medium, the process comprising: a) polymerizing said one or more ?-olefins in a solution phase in the presence of a polymerization catalyst and a inert solvent having a vapor pressure lower than 100 kPa at 20° C.; b) separating the produced polyolefin from the unreacted monomers and the inert solvent by means of a sequence of at least three volatilization chambers operating at a decreasing pressure, the second devolatilization chamber being operated at a pressure from 0.8 to 5 bar.

Abstract: This invention relates to a propylene polymer comprising a component having a crystallinity of 10% or less and a component having a crystallinity of 20% or more, said propylene polymer having: a) a melting point of X ° C. or more where X=?0.0038(Tp)2+0.36(Tp)+150, where Tp is the temperature of polymerization in ° C.; b) an Mw of 10,000 g/mol or more; c) a heat of fusion of from 1-70 J/g; d) Stereodefects per 10,000 monomer units of Y or less where Y=2.35(Tp)?100 (where Tp is the temperature of polymerization in ° C.) for the portion of the blend that is insoluble in hexane at 23° C.; e) a dot T-Peel on Kraft paper of 1 N or more; and f) a branching factor of 0.98 or less, where the branching factor is the ratio of g? measured at Mz to g? measured at Mw, and process to produce such polymers.

Abstract: The present invention provides polymerization catalyst compositions employing novel heterodinuclear metallocene compounds. Methods for making these new dinuclear metallocene compounds and for using such compounds in catalyst compositions for the polymerization of olefins are also provided.

Abstract: This invention relates to catalyst compositions, methods, and polymers encompassing at least one first Group 4 metallocene compound comprising bridging ?5-cyclopentadienyl-type ligands, in combination with at least one second Group 4 metallocene with non-bridging ?5-cyclopentadienyl-type ligands, typically in combination with at least one cocatalyst, and at least one activator. The compositions and methods disclosed herein provide ethylene polymers with a bimodal molecular weight distribution.

Abstract: Methods of forming supported catalyst systems, supported catalyst systems and polymerization processes utilizing the supported catalyst systems are described herein. The methods generally include providing an inorganic support material and contacting the inorganic support material with a support solvent to form a support solution. The methods further include contacting the support solution with a fluorine containing compound represented by the formula AlFpX3-pBq to impregnate the fluorine containing compound within the inorganic support material and form an intermediate, wherein X is selected from Cl, Br and OH?, B is H2O, p is selected from 1 to 3 and q is selected from 0 to 6. In addition, the methods include drying the intermediate to remove the solvent therefrom and heating the intermediate at a temperature of at least about 300° C.

Abstract: The present invention relates to a copolymer which contains 3-methylbut-1-ene as a comonomer and which contains ethene or propene as a further monomer, the proportion of the incorporated 3-methylbut-1-ene being 0.1 to 40 mol %, and to a process for preparing such copolymers, the polymerization being performed in the presence of a catalyst which comprises at least one cyclopentadienyl group.

Abstract: The present invention relates to new catalyst supports comprising nanofibers, a catalyst system comprising these supports as well as a process for preparing nanocomposites and the nanocomposites prepared. The invention especially concerns a supported catalyst system for polymerization of olefins, comprising a support made of fibers or a fleece of fibers, wherein the mean fiber diameter is less than 1000 nm, preferably less than 500 nm and the mean fiber length is more than 200,000 nm, preferably more than 500,000 nm and especially preferred more than 1,000,000 nm as well as a process for polymerizing olefinic systems in the presence of these catalyst systems and the resulting nanocomposites.

Abstract: A process for forming a high molecular weight, multi-block copolymer comprising two or more chemically distinguishable segments or blocks, the process comprising polymerizing one or more olefin monomers in the presence of a chain shuttling agent and a catalyst composition comprising two or more olefin polymerization catalysts capable of preparing polymers having differing chemical or physical properties under equivalent polymerization conditions, or a catalyst composition comprising at least one olefin polymerization catalyst containing multiple active catalyst sites capable of preparing polymers having differing chemical or physical properties.

Abstract: The invention relates to a process for the preparation of a polymer comprising monomeric units of ethylene, an ?-olefin and a vinyl norbornene applying as a catalyst system: a. a bridged or an group 4 metal containing an unbridged catalyst having a single cyclopentadienyl ligand and a mono substituted nitrogen ligand, wherein said catalyst is defined by the formula (I): b. an aluminoxane activating compound, c. 0-0.20 mol per mol of the catalyst of a further activating compound, wherein Y is a substituted carbon or nitrogen atom. The invention further relates to a polymer obtainable with the process of the invention.

Abstract: The present techniques relate to catalyst compositions, methods, and polymers encompassing a Group 4 metallocene compound comprising bridging ?5-cyclopentadienyl-type ligands, typically in combination with a cocatalyst, and a activator. The compositions and methods presented herein include ethylene polymers with low melt elasticity.

Abstract: The present invention relates to an ethylene/?-olefin interpolymer product comprising at least one ?-olefin interpolymerized with ethylene and, characterized in at least one aspect, as having improved properties when utilized in a hot melt adhesive formulation. The invention also relates to a process for manufacturing the interpolymer product wherein the process comprises employing two or more single site catalyst systems in at least one reaction environment (or reactor) and wherein the at least two catalyst systems have (a) different comonomer incorporation capabilities or reactivities and/or (b) different termination kinetics, both when measured under the same polymerization conditions. The interpolymer products are useful, for example, in applications such as hot melt adhesives, and also for impact, bitumen and asphalt modification, adhesives, dispersions or latexes and fabricated articles such as, but not limited to, foams, films, sheet, moldings, thermoforms, profiles and fibers.

Abstract: The present invention provides a polymerization process which is conducted by contacting an olefin monomer and at least one olefin comonomer in the presence of hydrogen and a metallocene-based catalyst composition. Polymers produced from the polymerization process are also provided, and these polymers have a reverse comonomer distribution, low levels of long chain branches, and a ratio of Mw/Mn from about 3 to about 6.

Abstract: The present invention discloses copolymers of styrene and ethylene with highly syndiotactic styrene blocks prepared with of a catalyst system comprising a metallocene catalyst component of the general formula (I): (Flu-R?—C p)M(n3-C3R?5)(ether)n wherein Cp is a cyclopentadienyl, substituted or unsubstituted, Flu is a fluorenyl, substituted or unsubstituted, M is a metal Group III of the Periodic Table, ether is a donor solvent molecule, R? is a structural bridge between Cp and Flu (9 position) imparting stereorigidity to the component, each R? is the same or different and is hydrogen or an hydrocarbyl having from 1 to 20 carbon atoms and n is 0, 1 or 2. It also discloses styrene-ethylene copolymers having a high styrene content in which styrene units form syndiotactic polystyrene blocks.

Abstract: The present invention provides polymerization catalyst compositions employing half-metallocene compounds with a heteroatom-containing ligand bound to the transition metal. Methods for making these hybrid metallocene compounds and for using such compounds in catalyst compositions for the polymerization and copolymerization of olefins are also provided.

Abstract: Supported catalyst systems and methods of forming the same are described herein. In one specific embodiment, the methods generally include providing an inorganic support material and contacting the inorganic support material with an aluminum fluoride compound represented by the formula AlFpX3-pBq to form an aluminum fluoride impregnated support, wherein X is selected from Cl, Br and OH?, B is H2O, p is selected from 1 to 3 and q is selected from 0 to 6. The method further includes contacting the aluminum fluoride impregnated support with a transition metal compound to form a supported catalyst system, wherein the transition metal compound is represented by the formula [L]mM[A]n; wherein L is a bulky ligand, A is a leaving group, M is a transition metal and m and n are such that a total ligand valency corresponds to the transition metal valency.

Abstract: A method of producing a prepolymerized catalyst for olefin polymerization comprising a fine powder removal step of removing fine particles from olefin-prepolymerized catalyst particles for olefin polymerization. The prepolymerized catalyst having a low fine particle content is applicable suitably to the field of continuous polymerization of olefins.

Abstract: A propylene-based terpolymer comprising: a) from 10.0% by mol to 79.0% by mol of propylene derived units; b) from 89.5% by mol to 20.5% by mol of 1-butene derived units; and c) from 0.5% by mol to 15% by mol of derived units of alpha olefin of formula CH2?CHZ wherein Z is a C4-C20 alkyl radical.

Abstract: A 1-butene/propylene copolymer composition having a content of propylene derived units from 4 to 10% by weight, wherein at least 50% of the polymer is present in the thermodynamically stable, trigonal form I after 100 hours at room temperature, said composition comprising: a) from 5% by weight to 95% by weight of an atactic 1-butene propylene copolymer having the following features: i) distribution of molecular weight Mw/Mn equal to or lower than 4; ii) no enthalpy of fusion detectable at a differential scanning calorimeter (DSC); and iii) infrared crystallinity lower than 0.5%; b) from 5% by weight to 95% by weight of an isotactic 1-butene propylene copolymer having the following features: i) isotactic pentads (mmmm) measured by 13C-NMR, higher than 80%; ii) melting point (Tm(II)) higher than 70° C.; and iii) distribution of molecular weight Mw/Mn equal to or lower than 4.

Abstract: A 1-butene/propylene copolymer composition having a content of propylene derived units from 1 to 4% by weight, wherein at least 50% of the crystalline polymer is present in the thermodynamically stable, trigonal Form I (detected by DSC analysis) after 100 hours of the first melting at room temperature comprising: b) from 5% by weight to 95% by weight of an atactic 1-butene propylene copolymer having the following features: i) distribution of molecular weight Mw/Mn equal to or lower than 4; ii) no enthalpy of fusion detectable at a differential scanning calorimeter (DSC); and iii) infrared crystallinity lower than 0.5%; b) from 5% by weight to 95% by weight of an isotactic 1-butene propylene copolymer having the following features: i) isotactic pentads (mmmm) measured by 13C-NMR, higher than 80%; ii) melting point (Tm(II)) higher than 70° C.; and iii) distribution of molecular weight Mw/Mn equal to or lower than 4.

Abstract: The invention relates to a polymer blend prepared by the process of combining under polymerization conditions: (A) a first catalyst capable of producing a first crystalline polymer having an Mw of 100,000 or less, (B) a second catalyst capable of preparing a second amorphous polymer having an Mw of 100,000 or less and differing in chemical or physical properties from the first polymer under equivalent polymerization conditions, (C) a cocatalyst, activator, scavenger, or combination thereof, and (D) one or more olefins; wherein the polymer blend is formed in-situ, comprises crystalline polymer segments and amorphous polymer segments, and has an Mw of 100,000 or less.

Abstract: A method of polymerizing olefins with catalyst systems, such as, for example, a multimodal catalyst system, wherein the catalyst system is stored at a controlled temperature to minimize loss of catalyst system productivity.

Abstract: Polymerization catalyst systems including three or more catalyst compounds are provided. Methods for olefin polymerization including the aforementioned catalyst systems are also provided.

Abstract: A transition metal complex represented by formula [1], and its production process; a substituent-carrying fluorene compound represented by formula [2], and its production process; an olefin polymerization catalyst component comprising the complex; an olefin polymerization catalyst obtained by contacting the catalyst component with a defined aluminum compound and/or a defined boron compound; and a production process of an olefin polymer using the catalyst:

Abstract: Catalysts useful for polymerizing olefins are disclosed. The catalysts comprise an activator and a bridged cyclopentadienyl complex that incorporates a monoanionic hydroxylamido or hydrazido ligand fragment. Suitable complexes have the structure: wherein M is a Group 4 metal; Z is a divalent linking group; X is N or O; each of R1 and R2 is independently C1-C4 alkyl or C6-C10 aryl; R1 and R2 can be joined together; n is 0 when X is O, and n is 1 when X is N; each Y is independently halide, alkyl, dialkylamido, aryl, or aralkyl. A modeling approach is used to identify particular valuable complexes, each of which incorporates a readily synthesized cyclopentadienyl precursor.

Abstract: A process for the production of an ethylene alpha-olefin copolymer is disclosed, the process including polymerizing ethylene and at least one alpha-olefin by contacting the ethylene and the at least one alpha-olefin with a metallocene catalyst in at least one gas phase reactor at a reactor pressure of from 0.7 to 70 bar and a reactor temperature of from 20° C. to 150° C. to form an ethylene alpha-olefin copolymer. The resulting ethylene alpha-olefin copolymer may have a density D of 0.927 g/cc or less, a melt index (I2) of from 0.1 to 100 dg/min, a MWD of from 1.5 to 5.0. The resulting ethylene alpha-olefin copolymer may also have a peak melting temperature Tmax second melt satisfying the following relation: Tmax second melt>D*398?245.

Abstract: The present invention provides polymerization catalyst compositions employing novel dinuclear metallocene compounds. Methods for making these new dinuclear metallocene compounds and for using such compounds in catalyst compositions for the polymerization and copolymerization of olefins are also provided.

Abstract: A propylene-based polymer which is suitably applicable to foam molding, sheet molding, blow molding or the like, because of having good flow characteristics, high melt tension, high swell ratio and thus good molding workability. It is attained by a propylene-based polymer or the like characterized by satisfying the following requirements (i) to (vi). Requirement (i): MFR is 0.1 g/10 minutes to 100 g/10 minutes. Requirement (ii): Q value by GPC is 3.5 to 10.5. Requirement (iii): ratio of components with a molecular weight of equal to or higher than 2,000,000, in a molecular weight distribution curve obtained by GPC, is equal to or larger than 0.4% by weight and less than 10% by weight. Requirement (iv): components, which elute at a temperature of equal to or lower than 40° C., are equal to or less than 3.0% by weight, in temperature rising elution fractionation by ODCB. Requirement (v): isotactic triad fraction (mm) measured with 13C-NMR is equal to or higher than 95%.

Abstract: Disclosed are an ethylene polymerization process, a catalyst for use in the process, a production method employing the catalyst, and a product produced thereby. More specifically, disclosed is a process of producing an ethylene copolymer from ethylene and an alpha-olefin comonomer, in which the produced ethylene copolymer has a multimodal molecular weight distribution and excellent processability and physical properties, and thus can increase the value and productivity of products, including pipes and films. Particularly, the produced ethylene copolymer has a trimodal or higher molecular weight distribution or density distribution, and thus, when it is a linear low-density copolymer, it has an excellent effect of improving the impact strength of films, and when it is a medium-density ethylene copolymer, it can be produced into pipes, which have slow crack growth rate and can be used even at high temperature.