|
Match
|
Document |
Document Title |
|
|
4719193 |
Processes for preparing polyethylene catalysts by heating catalyst precursors
Ethylene polymers are obtained in enhanced yield in a process for homopolymerizing ethylene or copolymerizing ethylene with an alpha-olefin having 3 to 8 carbon atoms employing a catalyst system...
|
|
|
4716205 |
Nickel-catalyzed polymerization of ethylene
Preparation of polyethylene in the presence of selected nickel-containing catalysts.
|
|
|
4713430 |
Preparation of ethene polymers by means of a Ziegler catalyst system
Finely divided ethene polymers are prepared by means of a Ziegler catalyst system composed of (1) a titanium-containing catalyst component obtained by precipitation in an organic liquid from (1.1)...
|
|
|
4707530 |
Polymerization catalyst
Ethylene is homopolymerized or copolymerized with another olefin monomer in the presence of a catalyst system comprising organo metal cocatalyst and a titanium-containing catalyst component, said...
|
|
|
4705714 |
Differentially crosslinked and oriented polyethylene film
An oriented film is prepared by crosslinking a sheet of HDPE to provide maximum crosslinking at the surfaces of the sheet and minimum orientation at its middle layer portion, and thereafter heating...
|
|
|
4699961 |
High efficiency catalysts for varying olefin polymer molecular weight distribution
Catalysts having high efficiency in preparing olefin polymers while controlling molecular weight distribution are disclosed. The catalysts utilize magnesium siloxide supports and the product...
|
|
|
4692501 |
Process for continuous multi-stage polymerization of olefins
In a process for producing an olefin polymer which comprises continuously polymerizing an olefin in the presence of a catalyst composed of a transition metal compound component and an...
|
|
|
4690800 |
Process for reducing the chances of ignition and explosion due to the decomposition of high-pressure industrial process gases
The danger of explosion due to decomposition of high-pressure industrial process gases, such as ethylene, is reduced by beginning to cool the decomposition gases with a delay of no more than 25...
|
|
|
4686265 |
Process for polymerization of olefins
A process for polymerizing one or more alpha-olefins in the presence of a catalyst system comprising (A) a solid titanium containing catalyst component said component prepared by contacting a...
|
|
|
4675368 |
Process for inhibiting crust formation in reactors during alpha-olefin prepolymerization modification of Ziegler catalyst
Process for inhibiting crust formation in reactors used for polymerising alpha-olefines, such as ethylene and propylene, in the presence of particles of catalytic solids containing titanium and...
|
|
|
4673719 |
Process for producing olefin polymers and catalyst composition therefor
In a process for producing olefin polymers or copolymers which comprises polymerizing olefins or copolymerizing olefins with each other or with dienes in the presence of [A] a solid titanium...
|
|
|
4672096 |
Catalyst composition for polymerizing alpha-olefins
A catalyst composition for polymerizing alpha-olefins is prepared by treating a carrier containing OH groups with an organomagnesium composition and contacting the thus-formed magnesium-containing...
|
|
|
4668577 |
Polyethylene filaments and their production
Crosslinked polyethylene filaments made of polyethylene having an average molecular weight of not less than 4×10 5 , which are stretched and crosslinked by irradiation of radioactive rays and have...
|
|
|
4657998 |
Polyethylene with broad molecular weight distribution
Catalyst system comprising titanium containing catalyst component, isoprenylaluminum and a halohydrocarbon for the production of polyethylene having a broad molecular weight distribution.
|
|
|
4657996 |
Process for producing polyethylene
A process for producing polyethylene comprises polymerizing ethylene or copolymerizing ethylene with other α-olefin in the presence of a catalyst system obtained by bringing the following...
|
|
|
4650842 |
Olefin polymerization process employing catalyst prepared from high pore volume, high purity alumina gel
Novel high pore volume, high purity alumina gels and catalysts prepared therefrom are provided by a unique alumina gel preparation comprising hydrolyzing an aluminum alcoholate in a medium of a...
|
|
|
4649182 |
Polymerization catalysts and methods of preparation thereof
The catalysts are composed of an organometallic compound and a solid catalytic component which is the reaction product of a transition metal derivative and a solid support having a composition, at...
|
|
|
4627962 |
Process and apparatus for reducing the chances of ignition and explosion from the decomposition of high pressure industrial process ethylene gases
An apparatus for evacuating the gases resulting from the decomposition of industrial process gases, such as ethylene, contained in a vessel under high pressure is adjacent to the vessel. The...
|
|
|
4621124 |
Catalyst system for the polymerization of ethylene
A catalyst system for use in the polymerization of ethylene under high pressure and temperature containing an alkyl-aluminum or alkylsiloxalane activator and a compound of the formula: (TiCla)...
|
|
|
4618661 |
Supported high efficiency polyolefin catalyst component and methods of making and using the same
A supported high efficiency catalyst component for polyolefin production and methods of making and using the same are disclosed. A catalyst support made from a solid, particulate support material,...
|
|
|
4617361 |
Process and catalyst for olefin polymerization
A process and catalyst for the polymerization of olefins wherein the catalyst is prepared by reacting scandium, yttrium or rare earth metal halides with certain transition metal compounds, reacting...
|
|
|
4617360 |
Process for the polymerization of α-olefins
Catalyst systems for the polymerization of α-olefins, as well as process for making and using the same, which comprises an organometallic compound, like an organoaluminum compound, and a solid...
|
|
|
4613655 |
Catalysts for the polymerization of olefins
New catalysts for the polymerization of olefins and more particularly of ethylene and mixtures thereof with higher alpha-olefins and/or diolefins, are disclosed. The catalysts are prepared by...
|
|
|
4607086 |
Continuous process for the manufacture of low-density polyethylene in stirred autoclaves
An improved continuous process for the manufacture of polymers of ethylene in autoclave reactors with practically complete back-mixing under pressure of from about 800 to about 2500 bars in the...
|
|
|
4605715 |
Process for polymerizing olefins in the presence of a catalyst prepared from organomagnesium compound, epihalohydrin reducing halide source and transition metal compound
Olefins are polymerized in the presence of, as a catalyst therefor, the catalytic reaction product resulting from heating a mixture of (A) at least one hydrocarbon soluble organomagnesium...
|
|
|
4603183 |
Hydrocarbon soluble catalyst supports and resultant polymerization catalysts
A method is provided for preparing hydrocarbon soluble magnesium siloxide supports comprising contacting such supports with sufficient aluminum alkoxide or organic ethers to render the supports...
|
|
|
4600633 |
Polyethylene superthin film and a process for the production of the same
A polyethylene superthin film having a thickness of at most 3 μm, a tensile modulus of at least 2000 kg/cm 2 , a breaking strength of at least 500 kg/cm 2 and a haze of at most 10% is produced by...
|
|
|
4597818 |
Method for producing laminated sheets or films
A novel method for producing laminated sheets or films consisting of a substrate layer or layers and a layer or layers of ultra-high molecular weight polyethylene. The method is characterized by...
|
|
|
4596862 |
Olefin polymerization using chromium on fluorided aluminophosphate
Ethylene polymer is particularly suitable for the production of tough film is produced under slurry conditions using a fluorided aluminophosphate support and a reaction temperature within the range...
|
|
|
4595735 |
Catalyst component for polymerization of olefins
A catalyst component for the polymerization of olefins and particularly ethylene which is prepared by contacting a contact product of a magnesium alkoxide, a halogenated hydrocarbon, a halogenated...
|
|
|
4587227 |
Ethylene polymers and chromium catalysts
Olefin polymerization catalysts are described which are based on solid inorganic oxides (such as silica) and polychromium complexes (such as octakis(μ-trimethylsilylmethyl)tetrachromium(II))....
|
|
|
4587163 |
Preparation of ultra high molecular weight polyethylene morphologies of totally fused particles with superior mechanical performance
An isotropic semicrystalline morphology of ultra-high-molecular-weight polyethylene and a method of making it. An original powder stock or a partially fused, melt-crystallized stock having a...
|
|
|
4585839 |
Catalyst containing an aromatic silicon compound for the polymerization of ethylene
A catalyst for the polymerization of ethylene comprising at least one halogenated compound of a transition metal of Groups IV to VI of the Periodic System and at least one aromatic silicon compound...
|
|
|
4579833 |
Process for the preparation of a supported catalyst based on vanadium compounds for the polymerization and copolymerization of ethylene and the catalysts obtained thereby
New catalysts which can be used for the polymerization and copolymerization of ethylene, comprising a support consisting basically of magnesium chloride on which is deposited by precipitation a...
|
|
|
4579757 |
Plastic containers for use in packaging and thermal processing of comestibles
Off-flavor development is alleviated, or substantially minimized, in thermally processed comestibles packed in plastic containers. The container wall which is in contact with the comestibles is...
|
|
|
4569975 |
Polymerization of olefins in presence of a catalyst prepared from organomagnesium compound, carbon dioxide compound, reducing halide source and transition metal compound
Olefins or mixtures thereof are polymerized in the presence of the product resulting from heating in an inert hydrocarbon diluent a mixture of (A) an organomagnesium material, (B) essentially...
|
|
|
4567243 |
Polymerization method
A catalyst and method in which the catalyst is active with a cocatalyst in the polymerization and copolymerization of 1-olefins and is prepared by reacting together one or more of a specific class...
|
|
|
4560733 |
Polymerization and catalyst
Polymerization of olefins in the presence of a catalyst system comprising titanium-coating component (A) associated with a milled blend of at least two different silica-containing components having...
|
|
|
4559394 |
Olefin polymerization using activated chromium catalyst treated with tertiary alcohol
A catalyst is produced by contacting an already activated silica-titania supported chromium composition with a tertiary alcohol and thereafter reactivating under relatively mild conditions. Such...
|
|
|
4552937 |
Polymerization catalyst system
Novel silicon-aluminum compounds having at least two aryl-silicon bonds useful as cocatalysts for a catalyst system for polymerizing olefins.
|
|
|
4547557 |
Silica-titania cogel from two-step hydrolysis
A silica-titania cogel is produced in a two-step process wherein in the first step an alkyl polysilicate and/or a tetraalkyl silicate is partially hydrolyzed in an alkaline organic solvent using...
|
|
|
4547479 |
Polyphosphate in chromium catalyst support
A catalyst support based on aluminum polyphosphate or polyphosphoric acid-impregnated alumina is provided by two alternative techniques. In the first embodiment, an aluminum polyphosphate...
|
|
|
4544762 |
Process for the preparation of oligomeric aluminoxanes
The present invention relates to a process for the preparation of oligomeric alkylaluminoxanes of the general formulae: ##STR1## in which R=C 1 -C 6 -alkyl, preferably methyl, and n=2-40,...
|
|
|
4543296 |
Conductive polymers
Disclosed is a method of making a conductive polymer from a non-aromatic ethylenically unsaturated gaseous monomer comprising bombarding an inert substrate with the monomer at a velocity greater...
|
|
|
4542197 |
Polymerization catalyst
Polymerization catalysts, particularly catalysts for the polymerization of olefins, are disclosed. The catalysts are prepared by mixing hydrides of organometallic compounds of metals belonging to...
|
|
|
4540757 |
Polymerization and catalyst
Polymerization of olefins in the presence of a catalyst system comprising titanium-containing component (A) associated with a milled blend of at least two different silica-containing materials...
|
|
|
4540758 |
Polymerization of ethylene with supported π allyl chromium complexes
A process for the polymerization or copolymerization of an olefinically unsaturated monomer which comprises contacting the monomer with a chromium metal catalyst composition which is the product...
|
|
|
4536550 |
Polyethylene composition
A polyethylene composition comprising three specific types of polyethylenes; polyethylene (A), polyethylene (B) and polyethylene (C) respectively. The polyethylene composition has a melt index not...
|
|
|
4535134 |
Method and apparatus for controlling the discharge of product from vapor phase polymerization of monomers in a horizontal stirred-bed reactor
A method and apparatus are disclosed for metering the removal of polymer or copolymer from the take-off end of a horizontal vapor phase polymerization stirred-bed reactor. The take-off zone...
|
|
|
4533706 |
Catalyst and process using same for producing olefin polymer
A catalyst system for the polymerization of olefins which comprises; (A) a hydrocarbyloxy group-containing solid catalyst component prepared by (i) reducing a titanium compound represented by...
|