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7601787 |
Ethylene polymerization process
A process for polymerizing ethylene is disclosed. The polymerization is performed in the presence of a Ziegler-Natta catalyst system in two slurry reaction zones. Most of the polyethylene (70-95...
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7598329 |
Process for manufacturing ultra high molecular weight polymers using novel bridged metallocene catalysts
The present invention relates to a process for manufacturing ultra high molecular weight polymers by means of polymerization and co-polymerization of olefins using novel bridged metallocene...
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7598327 |
Method for polymerizing olefins in a gas phase reactor using a seedbed during start-up
A method of starting up a gas phase polymerization reactor, comprising controlling an amount of hydrocarbon absorbed in a polymer seedbed during startup to avoid formation of agglomerates or...
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7592410 |
Polyethylene resin with narrow particle size distribution
The present invention relates to a polyethylene resin comprising A) a first ethylene homo- or copolymer fraction, and B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a...
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7582716 |
Compositions of ethylene/α-olefin multi-block interpolymer for blown films with high hot tack
The present invention relates to film layers and compositions having improved hot tack properties. The compositions comprise at least one ethylene/α-olefin interpolymer, wherein the...
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7582712 |
Alpha-olefins polymerization catalyst
Methods and apparatus to form a catalyst precursor, comprising combining in a reactor magnesium, an alkoxysilane compound, a halogenized silicon compound, a halogenized transition metal compound, a...
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7582711 |
Ziegler-type catalysts having increased productivity
The present invention relates to catalyst systems for polyolefin production, and more particularly, to catalyst systems for polyolefins used in producing films.
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7582710 |
Degassing process
An improved process for the polymerization of olefin monomer selected from (a) ethylene, (b) propylene, (c) mixtures of ethylene and propylene and (d) mixtures of (a), (b) or (c) with one or more...
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7579417 |
Metallocene compounds
A metallocene compound of formula (I) wherein: M is an atom of a transition metal; X, same or different, is a hydrogen atom, a halogen atom, or a R, OR, OSO 2 CF 3 , OCOR, SR, NR 2 or PR 2 group,...
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7572875 |
Ethylene homopolymers or copolymers having good machine direction (MD) elmendorf tear strength
This invention relates to catalyst compositions comprising a first metallocene compound, a second metallocene compound, at least one chemically-treated solid oxide, and at least one organoaluminum...
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7569648 |
Process for the copolymerization of ethylene
A process for producing a polymer of ethylene containing from 0.1 to 50% by weight of one or more derived units of alpha-olefins fo formula CH 2 ═CHR, wherein R is a C 2 -C 20 alkyl radical,...
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7569620 |
High modulus crosslinked polyethylene with reduced residual free radical concentration prepared below the melt
The present invention provides an irradiated crosslinked polyethylene containing reduced free radicals, preferably containing substantially no residual free radical. Disclosed is a process of...
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7566761 |
Olefin polymer and process for preparing the same
The present invention provides an olefin polymer having a narrow molecular weight distribution and a specific molecular weight, an olefin polymer having a functional group introduced at the...
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7560523 |
Production of isotactic and regiorandom polypropylene based polymer and block copolymers
One step ortho-alkylation of anilines with styrenes to give chiral anilines is obtained using a strong acid catalyst, e.g. CF 3 SO 3 H. Condensation of the product to give ligand and metallation...
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7557172 |
Ethylene-alpha-olefin copolymer
An ethylene-α-olefin copolymer comprising a repeating unit derived from ethylene and a repeating unit derived from an α-olefin having 3 to 20 carbon atoms, wherein a melt flow rate (MFR) is 0.01...
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7557171 |
Halogen substituted metallocene compounds for olefin polymerization
A metallocene compound comprising a transition metal, a first substituted or unsubstituted indenyl or fluorenyl ligand pi—bonded to the transition metal, a second monoanionic ligand bonded to the...
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7556911 |
Titanocene based compound, photosensitive composition, photosensitive transfer sheet and pattern forming method
A titanocene compound having a carbonyl group, and a photosensitive composition whose sensitivity has been enhanced by containing this as a photopolymerization initiator, a photosensitive transfer...
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7547754 |
Organometal compound catalyst
This invention provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer. This invention also provides catalyst compositions that are useful for...
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7528203 |
Cyclic olefin copolymers, and methods of making the same
Copolymers of an olefin or alpha-olefin and a cyclic olefin where the cyclic olefin comprises greater than 50 mole percent by weight of the copolymer have been discovered. These copolymers have...
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7521515 |
Filler layer for solar cell module and solar cell module using same
The invention mainly aims to provide an economical filler layer for a solar cell module which is excellent in the adhesion property to a transparent front substrate and a backside protective sheet,...
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7514510 |
Fluorenyl catalyst compositions and olefin polymerization process
An olefin polymerization process comprising contacting one or more olefins and a catalyst component in a reaction zone under suitable reaction conditions to form a polyolefin, wherein the catalyst...
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7511109 |
Rotomoulding polyethylene and method for producing said rotomoulding polyethylene
A method for producing rotomoulding polyethylene by fluidized bed gas phase polymerisation of ethylene and the improved rotomoulding polyethylene obtainable by the process.
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7511104 |
Polyolefins made by catalyst comprising a noncoordinating anion and articles comprising them
Polymers made by transition metal catalyst systems comprising a bulky noncoordinating anion (NCA) as cocatalyst component. In comparison to polymers containing a conventional NCA, these polymers...
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7507774 |
High modules crosslinked polyethylene with reduced residual free radical concentration prepared below the melt
The present invention provides an irradiated crosslinked polyethylene containing reduced free radicals, preferably containing substantially no residual free radical. Disclosed is a process of...
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7485685 |
Plastics pipes of polyolefins
Plastics pipes comprise polyolefins which can be prepared by means of a fluorine-modified chromium catalyst and are used for transporting gases and liquids.
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7473745 |
Preparation of multimodal polyethylene
Disclosed is a polyethylene composition. The composition comprises single-site multimodal resin A and single-site multimodal resin B, wherein resin A differs from resin B in molecular weight, in...
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7473744 |
Process for the production of polymers using a loop reactor
A polymer can be prepared using a loop reactor and process including feeding a process stream through the loop reactor and maintaining the loop reactor at a steady state by controlling a flow of...
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7462673 |
Method for producing aqueous polymer dispersions
Process for preparing an aqueous polymer dispersion by polymerization of at least one olefinically unsaturated compound in an aqueous medium in the presence of at least one dispersant and a solid...
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7459521 |
Heat-sealable polyolefins and articles made therefrom
Polyolefins, preferably polyethylene, having a density of about 0.86 to about 0.93 g/mL, having three or more or branches of the formula (CH 2 CH 2 ) m H wherein m is an integer of one or more,...
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7456243 |
Catalyst compositions and polyolefins for extrusion coating applications
This invention relates to the field of olefin polymerization catalyst compositions, and methods for the polymerization and copolymerization of olefins, including polymerization methods using a...
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7456242 |
Melt-processible, wear resistant polyethylene
Melt-processible, thermoplastic polyethylene compositions of high resistance against wear are disclosed and methods for making and processing same. Additionally, products comprising these...
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7452954 |
Polymer of ethylene
The invention relates to a polymer of ethylene which has a μ o /μ 2 ratio of at least 13; and a high load melt index HLMI lower than 8 g /10 min, and a value of tan δ at ω/ωc=0.01 of less...
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7452947 |
Silica-supported polymerization catalyst
A process for the preparation of a silicon containing transition metal compound that includes the steps of (a) non-hydrolytic sol-gel condensation of a silane of formula L x SiQ n wherein L is a...
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7439313 |
Magnesium dichloride-ethanol adducts and catalyst components obtained therefrom
A MgCl 2 .mEtOH.nH 2 O adducts, where 3.4<m≦4.4, 0≦n≦0.7, characterized by an X-ray diffraction spectrum, taken under the condition set forth above, in which, in the range of 2θ...
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7435372 |
Liquid bath annealing of polymers for orthopaedic implants
A method is provided for annealing a polymer for an orthopaedic implant by immersing the polymer in a liquid bath.
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7435370 |
Process of making a fiber
A fiber and a process for obtaining same from a high-modulus polyethylene, extrudable in state-of-the-art equipment and in the absence of previous solubilization in any kind of organic solvent is...
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7423103 |
Low fouling and high activity polymerization process
This invention is directed to a polymerization process that is carried out at relatively high productivity levels and with relatively low fouling. The process includes mixing together a catalyst...
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7423099 |
Process for producing polyolefin
A process for producing a polyolefin comprising a combination of liquid phase polymerization of α-olefin conducted in one or more liquid phase polymerization reactors and gas phase polymerization...
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7411023 |
Pipe for hot fluids
A polymer pipe for hot fluids, usually hot water is described. The pipe is characterised in that it comprises a multimodal polyethylene with a high molecular weight (HMW) fraction and a low...
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7402637 |
Method for producing a poly-1-olefin in the presence of a Ziegler catalyst
The invention relates to a method for producing a poly-1-olefin by polymerization of a 1-olefin of the formula R 4 C═CH 2 , in which R 4 is hydrogen or an alkyl radical having from 1 to 10...
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7393910 |
Catalyst composition for ethylene polymerization
A process for the polymerization of olefin monomers comprising contacting ethylene or a mixture of ethylene and one or more C 4-8 α olefins with a catalyst composition comprising one or more...
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7388059 |
Ethylene polymer, catalyst for producing thereof and method for producing thereof
A method for producing an ethylene polymer which comprises continuously polymerizing ethylene alone or copolymerizing ethylene and a C 3 -C 8 α-olefin by multistage polymerization in a plurality...
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7381783 |
Polymerization catalyst systems, their use, their products and articles thereof
The present invention relates to a process for the polymerization of monomers utilizing a bulky ligand hafnium transition metal metallocene-type catalyst compound, to the catalyst compound itself...
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7381778 |
Method of preparing a treated support
This invention relates to a method of preparing a supported catalyst comprising the steps of contacting a solid titanium with a supported catalyst compound, and heating the combination to at least...
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7381752 |
Selective, controlled manipulation of polymers
The present invention provides partial and complete shielding approaches to alter the cross-linking characteristics of irradiated polymers, such as polyethylene. Irradiated polymers and fabricated...
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7378481 |
Hot Melt Adhesives
A hot melt adhesive based on a functionalized metallocene polyethylene copolymer finds use in packaging applications where high heat resistance, as well as good cold tolerance, is required.
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7375169 |
Method for catalyst preparation and improved polyethylene blow molding resin
A method for polymerizing ethylene is provided. The method can include preparing a supported catalyst composition comprising the steps of: (a) dehydrating a chromium impregnated support; (b) at...
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7368516 |
Catalyst for trimerization of ethylene and process for trimerizing ethylene using the catalyst
A catalyst used for trimerization of ethylene into 1-hexene is descrobed, which comprises (i) a specific organometallic complex having a neutral multidentate ligand having a tripod structure, (ii)...
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7364685 |
Method for producing implant parts from highly cross-linked UHMWPE and implant parts for human medicine
The invention relates to a method of manufacturing implant parts made of highly cross-linked polyethylene, wherein a blank made of ultra-high-molecular-weight polyethylene is irradiated with...
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7354981 |
Polyethylene catalyst and a process for preparing the same
The present invention discloses a polyethylene catalyst and a process for preparing the same, said catalyst being composed of a main component of catalyst and a cocatalyst, wherein the main...
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