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8183333 |
Slurry phase polymerisation process
Polymerisation process in which polyethylene is produced in slurry in a polymerisation reactor in the presence of a Ziegler Natta catalyst and an activator, and a stream or slurry containing the...
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8168274 |
Polyethylene film with improved processability and mechanical properties
The present invention relates to a film comprising at least one layer comprising an ethylene homo- or copolymer which has a complex viscosity at 5 kPa shear stress eta5 of 200,000 or less and a...
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8163853 |
Metallocene-substituted pyridyl amines, their metal complexes, and processes for production and use thereof
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...
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8153734 |
Process for preparing a polyethylene resin in a double loop reactor with a mixture of bis-indenyl and bis-tetrahydroindenyl
The present invention discloses a process for preparing polyethylene resins in a double loop reactor wherein the catalyst system comprises a bis-tetrahydroindenyl and a bis-indenyl catalyst...
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8153736 |
Random copolymers and formulations useful for thermoforming and blow molding applications
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...
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8153757 |
Solution polymerization process for preparing polyolefins
A solution process for polymerizing one or more α-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 co...
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8129489 |
Ethylene polymer and use thereof
The present invention provides an ethylene polymer that has excellent fluidity and moldability as well as gives a molded product having excellent mechanical strength. The ethylene polymer of the...
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8124708 |
Polyolefin powder
Uncompounded polyolefin powder which is multimodal and has a particle size distribution such that D95 is less than 355 μm, D5 is at least 60 μm, and (D90−D10)/D50 is less than 1.2, where D95, D90...
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8119748 |
High activity, low molecular weight olefin polymerization process
Group 4 metal complexes comprising a polyvalent, heteroaryl donor ligand and their use as components of olefin polymerization catalysts, especially suited for preparing propylene/ethylene copolymer...
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8110644 |
Bimodal pipe resin and products made therefrom
Disclosed is a bimodal Ziegler-Natta catalyzed polyethylene, having a density of from 0.930 g/cc to 0.960 g/cc, and a molecular weight distribution of from 10 to 25, wherein an article formed...
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8088870 |
Methods for applying solution catalysts to reactor surfaces
A method for treating at least one interior surface (for example, a bed wall) of a fluidized bed polymerization reactor system, including by applying a solution catalyst (preferably at least...
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8084560 |
Polymerization processes using metallocene catalysts, their polymer products and end uses
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...
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8084559 |
Transition metal complex, process for producing said transition metal complex, substituent-carrying fluorene compound, process for producing said fluorene compound, catalyst component for olefin polymerization, catalyst for olefin polymerization, and process for producing olefin polymer
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...
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8076428 |
Ethylene copolymer having multiple pitch molecular weight distribution and the method of preparing the same
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...
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8076262 |
Production of broad molecular weight polyethylene
Broad molecular weight polyethylene and polyethylene having a bimodal molecular weight profile can be produced with chromium oxide based catalyst systems employing alkyl silanols. The systems may...
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8075830 |
Polypropylene blown film
A blown film that comprises polypropylene that has a melt flow rate of 1.8 to 14.0 g/10 min. and a melting point of at least 115° C. The blown film has a haze of less than 10% and a gloss of ...
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8067511 |
Ethylene copolymer and a method of preparing the same
Provided are ethylene copolymers and a process for preparing the same. More specifically, provided are ethylene copolymers exhibiting excellent processibility and physical properties due to its...
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8063175 |
Sintering ultrahigh molecular weight polyethylene
Methods of making ultrahigh molecular weight polyethylene (UMWPE) having increased strength and/or wear resistance, such as high yield strength, high tensile strength, high load strength, and/or...
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8058367 |
Methods and systems for controlling polymer particle size
Techniques are provided for producing polymer particles of a size just slightly larger than the size of polymer fines. The technique may prevent or limit the occurrence of reactor fouls associated...
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8048971 |
Process for the production of polyethylene and ethylene copolymers
The invention provides a process and an apparatus for the high pressure polymerization of ethylene in which a jet pump is used to pump a fluid into a polymer/monomer product mixture leaving a...
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8044160 |
Polyethylene composition for injection molded caps and closure articles
The present invention relates to a multimodal polyethylene composition wherein (i) the composition has an MFR2 of 0.1 to 100 g/10 min, (ii) the shear thinning index SHI(1,100) and the log MFR2 of...
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8039569 |
Polyethylene molding compositions for injection molding applications
Monomodal molding compositions based on polymers of ethylene, wherein the density of the molding compositions is in the range from 0.940 to 0.96 g/cm3, the Mi is in the range from 0.5 to 10.0 g/10...
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8039554 |
Ethylene-α-olefin copolymer, resin composition containing the same and molded article thereof
An ethylene-α-olefin copolymer having monomer units derived from ethylene and monomer units derived from an α-olefin of 3 to 20 carbon atoms, a melt flow rate (MFR) of 0.01 to 4 g/10 minutes, a d...
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8034886 |
Process for manufacturing high to ultra high molecular weight polymers using novel bridged metallocene catalysts
The present invention relates to a process of manufacturing high, very high, and ultra high molecular weight polymers comprising predominantly ethylene monomers. Ethylene is reacted in the presence...
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8029888 |
Preparation of transparent high density polyethylene sheets
A transparent high density polyethylene (HDPE) sheet is disclosed. The sheet has a thickness greater than or equal to 0.05 mm and a bulk haze less than 2%. The HDPE resin is converted into a sheet...
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8030370 |
Sequentially cross-linked polyethylene
A method of producing an improved polyethylene, especially an ultra-high molecular weight polyethylene utilizes a sequential irradiation and annealing process to form a highly cross-linked...
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8022154 |
Ethylene polymers, their production and use
This invention relates to an ethylene polymer comprising ethylene and up to 5 mole % of at least one comonomer, wherein the ethylene polymer has an Mw, of 10,000 to 50,000, an Mw/Mn of between 1.5...
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8022153 |
System and process for production of polyethylene and polypropylene
A method for producing a polyethylene or polypropylene polymer, or co-polymer thereof, comprises contacting a monomer-containing medium with polymerization catalyst particles in at least one high...
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8013086 |
Method for preparing elastomeric copolymers of ethylene and α-olefins
Provided is a process for preparing copolymers of ethylene with α-olefin. More specifically, provided are transition metal compound being useful as catalyst for preparing those copolymers, a ...
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8008365 |
Crosslinking of polyethylene for low wear using radiation and thermal treatments
The present invention discloses methods for enhancing the wear-resistance of polymers, the resulting polymers, and in vivo implants made from such polymers. One aspect of this invention presents a...
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8003752 |
Sintering ultrahigh molecular weight polyethylene
Articles made of and/or including ultrahigh molecular weight polyethylene (UMWPE) having increased strength and/or wear resistance, such as high yield strength, high tensile strength, high load...
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8003709 |
Crosslinking of polyethylene for low wear using radiation and thermal treatments
The present invention discloses methods for enhancing the wear-resistance of polymers, the resulting polymers, and in vivo implants made from such polymers. One aspect of this invention presents a...
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7993401 |
Solid state deformation processing of crosslinked high molecular weight polymeric materials
Solid-state deformation processing of crosslinked high molecular weight polymers such as UHMWPE, for example by extrusion below the melt transition, produces materials with a combination of high...
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7989564 |
Catalyst systems and their use in polymerization processes
A catalyst system comprising a hafnocene catalyst compound and zirconocene catalyst compound, wherein the hafnocene and/or zirconocene include(s) at least one ligand substituted with at least one...
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7985817 |
Homogeneous catalyst system for producing ethylene homopolymer or ethylene copolymers with alpha-olefins
Disclosed is a homogeneous catalyst system for producing an ethylene homopolymer or an ethylene copolymer with α-olefin. Specifically, this invention pertains to a transition metal catalyst which ...
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7977269 |
Diimine metal complexes, methods of synthesis, and methods of using in oligomerization and polymerization
Novel α-diimine metal complexes, particularly iron complexes, having a phenyl sulfidyl or substituted phenyl sulfidyl metal complexing group are disclosed. The α-diimine metal complexes having a p...
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7964681 |
Chain growth reaction process
A process is disclosed for the preparation of zinc alkyl chain growth products via a catalysed chain growth reaction of an alpha-olefin on a zinc alkyl, wherein the chain growth catalyst system...
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7947367 |
Fibers made from copolymers of ethylene/α-olefins
A fiber is obtainable from or comprises an ethylene/α-olefin interpolymer characterized by an elastic recovery, Re, in percent at 300 percent strain and (1) cycle and a density, d, in grams/cubic ...
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7943727 |
Polymer stream transfer
Process for heating a polymer-containing stream being transferred from a polymerization reactor to a degassing vessel operating at a pressure between 6 bara and 12 bara. The process includes...
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7943700 |
Enhanced ESCR of HDPE resins
Disclosed are polyethylene (“PE”) compositions, articles comprising PE compositions, and methods of making blended PE compositions, wherein the blended composition comprises from about 80 to abo...
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7935884 |
Encapsulant layer for photovoltaic module, photovoltaic module and method for manufacturing regenerated photovoltaic cell and regenerated transparent front face substrate
An encapsulant layer for a photovoltaic module enabling recovering and recycling or reusing of reutilizeable resources such as a transparent front face substrate and photovoltaic cell and the like...
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7932341 |
Polypropylene polymer film and adhesive film using the same
An object of the present invention is to provide a polypropylene polymer film superior in convenience in handling that does not generate troubles such as wrinkling, elongation or breakage during...
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7932331 |
Polymerisation of ethylene and α-olefins with imino-quinolinol complexes
The present invention discloses active oligomerization or polymerization catalyst systems based on imino-quinolinol complexes.
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7928173 |
Transition metal catalytic systems and methods for preparing ethylene homopolymers or copolymers of ethylene and α-olefins using the same
Provided are transition metal catalytic systems for preparing ethylene homopolymers or copolymers of ethylene with α-olefins. More specifically, provided are Group 4 transition metal catalysts, ...
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7923512 |
Process for producing medical implant or medical implant part comprising porous UHMWPE
The invention provides a medical implant or medical implant part comprising porous ultrahigh molecular weight polyethylene having a weight average molecular weight of about 400,000 atomic mass...
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7910669 |
Methods of preparing a polymerization catalyst
A method comprising (a) contacting a support and a chromium-containing compound to form chromium-containing support, (b) heat treating the chromium-containing support in an oxidizing atmosphere to...
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7902308 |
Polymerisation catalysts
A complex compound comprising the skeletal unit of Formula A, wherein the ring represented by C(R1)-A1-A2-(A3)x-C(R2)—C— has delocalised unsaturation and is optionally substituted via one or mor...
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7897539 |
Methods of preparing a polymerization catalyst
A method of preparing a composition comprising dry mixing commercial grade alumina and a solid sulfating agent to form a mixture and calcining the mixture to form a sulfated alumina support.
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7897826 |
Process and plant for oligomerization/polymerization of ethylene and/or alphaolefins
The present invention relates to a process for oligomerization/polymerization of ethylene and/or alpha-olefins, comprising the steps of oligomerizing/polymerizing ethylene and/or alpha-olefins to...
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7893181 |
Bimodal film resin and products made therefrom
A polymer, and a process of producing the polymer, that comprises at least one olefin and has a density of 0.955 g/cc to 0.959 g/cc and a secant modulus 140,000 psi to 220,000 psi. A film that...
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