Abstract: An organometallic complex, a catalyst composition employing the same, and a method for preparing polyolefin are provided. The organometallic compound has a structure represented by Formula (I) wherein M is Ti, Zr, or Hf; X is —O—, or —NR6—; R1 and R2 are independently hydrogen, C1-6 alkyl group, C6-12 aryl group, or R1 and R2 are combined with the carbon atoms, to which they are attached, to form an C6-12 aryl moiety; R3, R4 and R5 are independently fluoride, chloride, bromide, C1-6 alkyl group, C6-12 aryl group, C3-6 hetero aryl group, C7-13 aryl alkyl group or C7-12 alkyl aryl group; and R6 is hydrogen, C6-12 aryl group or C7-12 alkyl aryl group.

Abstract: To provide a piezoelectric body film that can suppress decrease in the piezoelectric constant d31, a method of producing a piezoelectric body film, and a piezoelectric body device. A piezoelectric body film comprising a fluororesin as a piezoelectric material, the fluororesin containing, as a main constituent unit, a repeating unit derived from vinylidene fluoride, a piezoelectric constant d31 of the piezoelectric body film being 20 pC/N or greater, and an extrapolated onset temperature at start of shrinkage determined by TMA measurement being not lower than 90° C. and not higher than 115° C. The difference between piezoelectric constants d31 measured before and after heating the piezoelectric body film at 100° C. for 24 hours relative to the piezoelectric constant d31 before the heating for 24 hours is 20% or less.

Abstract: A polyethylene homopolymer composition comprises: a first ethylene homopolymer having a density, d1 of from 0.943 to 0.975 g/cm3, a melt index, I21 of from 0.01 to 10 g/10 min, and a molecular weight distribution, Mw/Mn of less than 3.0; and a second ethylene homopolymer having a density, d2 of from 0.950 to 0.985 g/cm3, a melt index, I22 of at least 500 g/10 min, and a molecular weight distribution, Mw/Mn of less than 3.0; wherein the ratio of the melt index, I22 of the second ethylene homopolymer to the melt index, I21 of the first ethylene homopolymer is at least 50. The polyethylene homopolymer compositions which may be nucleated have a weight average molecular weight, Mw of ?75,000, a high load melt index, I21 of at least 200 g/10 min, a molecular weight distribution, Mw/Mn of from 4.0 to 12.0 and may be usefully employed in molding applications, such as, for example, in compression molded closures.

Abstract: A polyethylene homopolymer composition comprises: a first ethylene homopolymer having a density, d1 of from 0.930 to 0.975 g/cm3, a melt index, I21 of from 0.01 to 10 g/10 min, and a molecular weight distribution, Mw/Mn of less than 2.5; and a second ethylene homopolymer having a density, d2 of from 0.945 to 0.980 g/cm3, a melt index, I22 of at least 1.0 g/10 min, and a molecular weight distribution, Mw/Mn of less than 2.5; wherein melt index, I22 of the second ethylene homopolymer is greater than the melt index, I21 of the first ethylene homopolymer. The polyethylene homopolymer compositions which may be nucleated have a weight average molecular weight, Mw of ?75,000, a molecular weight distribution, Mw/Mn of less than 4.0 and may be usefully employed in molding applications, such as, for example, in compression molded closures.

Abstract: The present invention relates to a polyethylene resin prepared using a continuous process having and at least one metallocene catalyst composition: a molecular weight distribution Mw/Mn lower than 6.5; a molecular weight distribution Mw/Mn of at least 3.5; a melt index ranging from an HLMI of at least 1.20 g/10 min to an MI2 of at most 6.0 g/10 min wherein MI2 is determined according to ISO 1133:1997 at a temperature of 190° C. and under a load of 2.16 kg, and HLMI is determined according to ISO 1133:1997, at a temperature of 190° C. and under a load of 21.6 kg; melt index ratio HLMI/MI2 below or equal to 30; and a melt strength of X in Newtons, as determined by Göttfert Rheotens Melt Strength Apparatus, 190° C., as described in the Experimental section, satisfying the following equations (1) and/or (2) X is greater than ?0.026 ln(MI2)+0.0498??(1) X is greater than ?0.026 ln(HLMI)+0.1334??(2) with Mw being the weight-average molecular weight and Mn being the number-average molecular weight.

Abstract: Ethylene-based polymers are characterized by a density from 0.92 to 0.955 g/cm3, a HLMI of less than 35 g/10 min, and a ratio of a number of short chain branches (SCBs) per 1000 total carbon atoms at Mz to a number of SCBs per 1000 total carbon atoms at Mn in a range from 11.5 to 22. These polymers can have a higher molecular weight (HMW) component and a lower molecular weight (LMW) component, in which a ratio of a number of SCBs per 1000 total carbon atoms at Mn of the HMW component to a number of SCBs per 1000 total carbon atoms at Mn of the LMW component is in a range from 10.5 to 22. These ethylene polymers can be produced using a dual catalyst system containing an unbridged metallocene compound with an indenyl group having at least one halogen-substituted hydrocarbyl substituent with at least two halogen atoms, and a single atom bridged metallocene compound with a fluorenyl group and a cyclopentadienyl group.

Abstract: A method of making a polyolefin nanocomposite including, mixing a zinc-aluminum layered double hydroxide (LDH), and a zirconocene complex in a non-polar solvent to form a first mixture. Prior to the mixing the zirconocene complex is not supported on the zinc-aluminum LDH. The method further includes sonicating the first mixture for at least one hour to form a homogeneous slurry. The method further includes degassing the homogenous slurry and adding at least one olefin gas to form a second mixture. The method further includes adding an aluminoxane catalyst to the second mixture and reacting for at least 10 minutes to form a reaction mixture including the polyolefin nanocomposite. The method further includes separating the polyolefin nanocomposite from the reaction mixture.

Abstract: Platinum complexes having ferrocene-diphosphine ligands for catalysis of the hydroxycarbonylation of ethylenically unsaturated compounds.

Abstract: The present invention relates to a transition metal compound for a catalyst for olefin polymerization and to a catalyst for olefin polymerization comprising the same. Specifically, the present invention relates to a transition metal compound for an olefin polymerization catalyst in which an allyltrimethylsilane substituent is introduced into the cyclopentadienyl group and to a catalyst for olefin polymerization comprising the same.

Abstract: The present invention relates to a catalyst composition comprising: catalyst component A comprising a bridged metallocene compound with two tetrahydroindenyl groups, each group being unsubstituted or substituted; catalyst component B comprising a bridged metallocene compound with a substituted or unsubstituted cyclopentadienyl group and a substituted or unsubstituted fluorenyl group; an optional activator; an optional support; and an optional co-catalyst. The present invention also relates to a polymerization process using said composition. The invention further relates to olefin polymers at least partially catalyzed by said catalyst composition and articles comprising said olefin polymers.

Abstract: Provided is a method of preparing a superabsorbent polymer. More specifically, provided is a method of preparing a superabsorbent polymer capable of exhibiting improved initial absorbency and a rapid absorption rate by polymerizing monomers having acidic groups, of which part is neutralized with a basic material including potassium hydroxide, in the presence of an encapsulated foaming agent.

Abstract: A method for manufacturing a water absorption treatment material made of a plurality of grains includes a preparing step, a pulverizing step, a core portion forming step, and a coating portion forming step. The preparing step is a step of preparing a paper powder to which water-absorbent polymers adhere, the paper powder being derived from a sanitary product. The pulverizing step is a step of pulverizing remaining polymers using a pulverizer. The core portion forming step is a step of forming a core portion constituting each of the grains The coating portion forming step is a step of forming a coating portion so as to cover the core portion, the coating portion containing the paper powder, and the remaining polymers pulverized in the pulverizing step. In the pulverizing step, the remaining polymers left in a state of adhering to the paper powder are subjected to the pulverizer.

Abstract: A process or apparatus for producing polyethylene with improved film thinning and handleability involves polymerizing high-pressure ethylene using an autoclave-type reactor in the presence of a polymerization initiator. The reaction zone of the reactor has at least two different temperature sections; the polymerization initiator and the ethylene are supplied to the upstream temperature section in the reaction zone and the ethylene is polymerized to generate polyethylene; unreacted ethylene and the polyethylene generated at the upstream temperature section in the reactor flow into the downstream temperature section in communication with the upstream temperature section, so that additional polyethylene is generated at the downstream temperature section. A difference (?T [° C.]) between a temperature (T1 [° C.]) of the temperature section positioned upstream and a temperature (T2 [° C.

Abstract: Supported chromium catalysts with an average valence less than +6 and having a hydrocarbon-containing or halogenated hydrocarbon-containing ligand attached to at least one bonding site on the chromium are disclosed, as well as ethylene-based polymers with terminal alkane, aromatic, or halogenated hydrocarbon chain ends. Another ethylene polymer characterized by at least 2 wt. % of the polymer having a molecular weight greater than 1,000,000 g/mol and at least 1.5 wt. % of the polymer having a molecular weight less than 1000 g/mol is provided, as well as an ethylene homopolymer with at least 3.5 methyl short chain branches and less than 0.6 butyl short chain branches per 1000 total carbon atoms.

Abstract: Ethylene-based polymers having a density of 0.952 to 0.968 g/cm3, a ratio of HLMI/MI from 185 to 550, an IB parameter from 1.46 to 1.80, a tan ? at 0.1 sec?1 from 1.05 to 1.75 degrees, and a slope of a plot of viscosity versus shear rate at 100 sec?1 from 0.18 to 0.28 are described, with low melt flow versions having a HLMI from 10 to 30 g/10 min and a Mw from 250,000 to 450,000 g/mol, and high melt flow versions having a HLMI from 30 to 55 g/10 min and a Mw from 200,000 to 300,000 g/mol. These polymers have the processability of chromium-based resins, but with improved stress crack resistance and topload strength for bottles and other blow molded products.

Abstract: Methods of adding a catalyst to a bulk polymerization process may include mixing the catalyst with propylene to form a catalyst mixture that is substantially free of any C20 or greater hydrocarbons, feeding the catalyst mixture into a polymerization reactor, activating the catalyst mixture; and performing a polymerization on the catalyst mixture in the polymerization reactor. Polymers may be formed by polymerization processes that are substantially free of any C20 or greater hydrocarbons.

Abstract: The present invention relates to a catalyst for olefin polymerization. Specifically, the present invention relates to a hybrid catalyst comprising different transition metal compounds and capable of preparing a polyolefin, particularly a linear low-density polyethylene, which has excellent processability, impact strength, and haze.

Abstract: Supported chromium catalysts with an average valence less than +6 and having a hydrocarbon-containing or halogenated hydrocarbon-containing ligand attached to at least one bonding site on the chromium are disclosed, as well as ethylene-based polymers with terminal alkane, aromatic, or halogenated hydrocarbon chain ends. Another ethylene polymer characterized by at least 2 wt. % of the polymer having a molecular weight greater than 1,000,000 g/mol and at least 1.5 wt. % of the polymer having a molecular weight less than 1000 g/mol is provided, as well as an ethylene homopolymer with at least 3.5 methyl short chain branches and less than 0.6 butyl short chain branches per 1000 total carbon atoms.

Abstract: The present disclosure relates to a linear low-density polyethylene copolymer and a preparation method thereof. The linear low-density polyethylene copolymer has a long-chain branching (LCB) distribution similar to that of general metallocene polyethylene (mPE) and has good mechanical properties such as processability and toughness. Thus, the linear low-density polyethylene copolymer is useful for molding into shrinkage films, agricultural films, etc.

Abstract: A catalyst composition, a method of preparing a polyolefin including the same, and a polyolefin prepared from the same are disclosed herein. In some embodiments, a catalyst composition comprises a first transition metal compound represented by Chemical Formula 1, and a second transition metal compound represented by Chemical Formula 2, wherein a molar ratio of the first transition compound to the second transition metal compound ranges from 1:0.3 to 1:3.5. The catalyst composition is capable of preparing a polyolefin having excellent mechanical stability, while exhibiting excellent process stability and high polymerization activity during the preparation of a polyolefin in a slurry process.