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6518376 |
Ethylene polymers
Disclosed herein are ethylene polymers having a density of 0.95 to 0.955, a melt index from 0.2 to 0.6 g/10 min., a high load melt index from 20 to 70 g/10 min., and a heterogeneity index from 10...
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6515093 |
Polymers, and novel compositions and films therefrom
A novel propylene copolymer is disclosed. Also disclosed is a novel composition comprising about 85 to about 99 weight percent of a polymeric ethylenic containing component having a density no...
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6515076 |
Polyethylene resins and its compounds for container uses and containers
The present invention provides polyethylene resin and its compounds for container uses, which realize molding of thin-walled articles and high-speed molding, achieves/achieve excellent printability...
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6506919 |
Metallocene compounds and their use for olefin polymerization
The present invention relates to a metallocene compound and the olefin polymerization using the same, particularly to a metallocene compound and the olefin polymerization using this compound on...
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6500901 |
Compositions of linear ultra low density polyethylene and propylene polymers and films therefrom
A novel composition is disclosed comprising about 80 to about 99 weight percent based on the composition, of a linear ultra low density polyethylene (LULDPE) and about 1 to about 20 weight percent...
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6500909 |
Transition metal compound, catalyst component for olefin polymerization, catalyst for olefin polymerization, and process for producing olefinic polymer
A transition metal compound represented by the general formula (2) or (3) described below, a catalyst component for olefin polymerization comprising said transition metal compound, a catalyst...
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6495640 |
Process for polymerizing alpha-olefins
Process for polymerizing alpha-olefins, in which at least one alpha-olefin is placed in contact, under polymerizing conditions, with a catalytic system comprising (a) a solid catalyst comprising...
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6495646 |
Polyolefins with new structures
Polyolefins with unique highly branched structures, and which have unusually low Mark-Houwink constants are described. They are useful for instance as elastomers, viscosity index modifiers and...
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6492472 |
Mixed catalysts for use in a polymerization process
The present invention relates to mixed catalyst system of at least one bridged, bulky ligand metallocene-type compound, and at least one bridged, asymmetrically substituted, bulky ligand...
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6489427 |
Polymer compositions
Polyethylenes are prepared having a density in the range 900-980 kg/m 3 and a weight average molecular weight ≧375,000 characterized by a fracture toughness at −40° C. >20 kJ/m 2 and a...
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6489428 |
Titanated chromium-based catalysts to produce polyethylene
The present invention relates to a supported chromium-based catalyst titanated under specific conditions and used for the homopolymerisation or the copolymerisation of ethylene. The polyethylene...
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6482901 |
Titanated chromium/silica-aluminophosphate catalyst
The present invention relates to a chromium/silca-aluminophosphate catalyst, titanated under specific conditions and used for the homopolymerisation or the copolymerisation of ethylene. The...
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6482967 |
Metallocenes, polymerization catalyst systems, their preparation, and use
Metallocenes having a 9-fluorenyl group and another cyclic dienyl group connected by a single carbon having a terminally unsaturated hydrocarbyl substituent wherein the 9-fluorenyl group has a...
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6482905 |
Unsymmetric unbridged bis-indenyl metallocenes and their use
Unsymmetrical unbridged bis-substituted indenyl compounds in which one indenyl is substituted by a 2-aryl or 2-aryl alkyl substituent and the other indenyl is substituted by a terminally...
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6479609 |
Multi-stage process for the polymerization of olefins
A multi-stage process for preparing ethylene (co)polymers having broad molecular weight distributions is disclosed, said process comprising: (A) a first polymerization stage in which, in the...
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6472484 |
Processes for producing polyolefin composition
The present invention provides a method for producing a polyolefin composition having a narrow composition distribution and is characterized in that when at least two olefins are copolymerized in...
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6462149 |
Control of resin split in single-reactor manufacture of bimodal polyolefins
Bimodal resin products are produced in a single reactor by using two bicomponent catalyst compositions, each having a high molecular weight and a low molecular weight component, in different...
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6462161 |
Polyolefin composition with molecular weight maximum occurring in that part of the composition that has the highest comonomer content
The invention relates to a polyolefin copolymer composition produced with a catalyst having a metallocene, complex in a single reactor for the polymer of an α-olefin monomer with one or more...
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6462154 |
Process for preparing olefin polymer and catalyst for polymerization of olefin
There are disclosed a catalyst for the polymerization of an olefin which comprises (A) a transition metal complex compound represented by the general formula (I) wherein the respective symbols...
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6458911 |
Ethylene polymer film resins
A class of relatively high molecular weight, high density ethylene polymers (HMW-HDPE) is disclosed capable of being formed into thin films of high strength, such polymers having a density of at...
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6458910 |
High impact LLDPE films
Blown films of linear low density polyethylene are produced by a high stalk process comprising extruding the linear low density polyethylene through an annular die to form an extruded tube of...
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6455660 |
Homopolymer of ethylene
A polyethylene having the following properties: an annealed density D/weight average molecular weight M w relationship defined by the equation D>1104.5M w −0.0116 , and a Charpy Impact I/High...
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6448355 |
Elastic fibers, fabrics and articles fabricated therefrom
Elastic fibers and fabrics made from homogeneously branched substantially linear ethylene polymers are disclosed which can be produced on conventional polypropylene or polyethylene fiber or fabric...
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6448351 |
Elastomeric copolymers of ethylene with propylene and process for their preparation
Amorphous copolymers of ethylene with propylene, and optionally with minor amounts of polyenes, have the following characteristics: (A) the % content by mole of propylene in the copolymer (%P) and...
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6448357 |
Polyolefin resin composition
A polyolefin resin composition comprising (A) an ethylene-based polyolefin having a density of 0.865 to 0.980 g/cm 3 and MFR of 0.01 to 50 g/10 min, (B) a phosphorous compound, and (C) at least...
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6444606 |
Supported catalyst system, method for the production and use thereof in olefin polymerization
The invention relates to a catalyst system obtained by mixing at least one metallocene, at least one co-catalyst and at least one support which is rendered inert. The invention further relates to a...
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6433120 |
Method for processing polyethylene having a molecular weight of at least 400,000 by heating at an elevated pressure
A method for processing ultra-high molecular weight polyethylene (UHMWPE) of at least 400,000 by heating under an elevated pressure, followed by cooling, wherein UHMWPE having a lamellar thickness...
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6433110 |
Process for producing alkene polymers by gas phase polymerisation
Polymerizable alkanes are prepared by gas-phase polymerization in the presence of catalyst systems by a process in which the catalyst systems used are supported castalyst systems.
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6423659 |
&pgr -complex compounds
π-complex compounds and in particular metallocene compounds of formula (Ia)(Ib), in which πI and πII represent π-systems, D designates a donor atom and A designates an acceptor atom, D and A...
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6420301 |
Transition metal complexes
Transition metal complexes of the formula (Ia) or (Ib), in which the substituents and indices have the following meanings: M is titanium, zirconium, hafnium, vanadium, niobium or tantalum or an...
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6417305 |
Oligomerization of ethylene
Ethylene is oligomerized with certain catalysts based on iron and cobalt complexes of 2,6-pyridinecarboxaldehydebis(imine) and 2,6-diacylpyridine-bis(imine) tridentate ligands.
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6413900 |
Metallocene stabilized alumoxane
Stabilized alumoxane solutions are provided as well as a method for producing such solutions. The method generally involves the use of metallocene catalyst component(s) that when mixed with...
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6410768 |
Diimino compounds
The present invention is related to diimino compounds of formulae (I) R 2 —N═C(R 1 )(R 3 ) n C(R 1 )═N—R 2 and (II) (R 1 ) 2 C═N—(CR 2 4 ) m —N═C(R 1 ) 2 functionalized with at...
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6407192 |
Production of polyethylene for blow molding
A process for producing high density polyethylene suitable for blow molding and having high environmental stress cracking resistance and rigidity copolymerizing ethylene and an alpha-olefinic...
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6407191 |
Medium density ethylene polymers, a process to prepare these polymers and use of carbonyl group containing chain transfer agents in this process
The present invention relates to an ethylene homo or copolymer having a density of between 0.923 and 0.935 g/cm 3 , having a molecular weight distribution M w /M n of between 3 and 10, and...
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6395847 |
Supported organometallic catalysts and their use in olefin polymerization
The invention is directed to organometallic catalysts prepared by a process comprising a) combining nucleophilic group-containing particulate support material with an arylboron or arylaluminum...
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6391985 |
High condensing mode polyolefin production under turbulent conditions in a fluidized bed
A fluidized bed olefin polymerization process is operated in the turbulent regime while utilizing greater than 17.5% liquid in the recycle fluid to remove the heat of reaction. The ratio of...
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6384153 |
Process optimization of peroxide injection during polyethylene production
In a process for the high-pressure polymerization of ethylene in a high-pressure autoclave or in a high-pressure tube reactor having one or more metering points for one or more peroxides, no...
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6384163 |
Spherical catalyst, process for preparing a spherical polyethylene of ultra-high molecular weight
A process for preparing a spherical polyethylene of ultra-high molecular weight. A process for preparing a spherical support for the polymerization of alpha-olefins from an ammonium dawsonite...
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6380333 |
Group 8, 9 or 10 olefin copolymerization catalyst
Olefin co- or homopolymers having a good molecular weight and short chain branching may be prepared in the presence of a pyridyl bridged bisphosphinimine complex of a Group 8, 9 or 10 metal.
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6369177 |
Catalyst for olefin polymerization and method of polymerizing olefin
The present invention is intended to provide an olefin polymerization catalyst exhibiting excellent olefin polymerization activity and capable of producing polyolefins of excellent properties and...
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6369253 |
Metallocene compounds from amino alcohol-derived ligands
A method is provided for synthesizing metallocene compounds useful as polymerization catalysts and the like. The method involves (a) preparation of an amino alcohol-derived ligand by reacting a...
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6365539 |
Polyolefin catalysts
This invention is directed to novel Group 8-10 transition metal catalysts and to batch or continuous polymerizations using these catalysts. The catalysts of the present invention readily convert...
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6365695 |
Ultrasonic catalyst feed for fluid bed olefin polymerization
Liquid catalyst composition is fed to a fluidized bed olefin polymerization reactor through an ultrasonic nozzle, enabling improved control over average catalyst composition droplet size and size...
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6359085 |
Process for production of ethylene polymers
The invention relates to a process for the production of ethylene polymers by the polymerization of ethylene or the copolymerization of ethylene with one or more C 3 to C 8 olefins in contact...
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6359095 |
Process for the preparation of polyolefins
A process for the preparation of an olefin polymer by polymerization or copolymerization of an olefin of the formula R a —CH═CH—R b , in which R a and R b are identical or different and are...
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6355744 |
Cyclopentadienyl/phosphinimine catalyst with one and only one activatable ligand
Organometallic complexes of titanium or zirconium having only three ligands (namely a cyclopentadienyl ligand, a phosphinimine ligand and an activatable ligand) are catalyst components for olefin...
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6342622 |
Indenyl compounds for the polymerization of olefins
Indenyl compound of formula (1) wherein: M is a transition metal from the lanthanides or from group 3, 4, 5 or 6 of the Periodic System of Elements, Q is an anionic ligand to M, k is the number...
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6339036 |
Low aluminum and magnesium Z-N solution catalysts
The present invention provides a Ziegler-Natta catalyst useful in solution processes for the polymerization of olefins having a low amount of aluminum and magnesium. The catalysts of the present...
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6335411 |
Ethylene polymer and processes for obtaining it
Ethylene polymer having a blow-up ratio (R B ) of at least 1.4, a resistance to crazing under stress (ESCR) of at least 55 h and a melt index (MI 5 ) of at least 0.2 g/10 min. Processes for...
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