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5354820 |
Process for the preparation of olefin polymer
This invention relates to a process of producing an olefin polymer having stereoregularity by polymerizing an olefin in the presence of a catalyst obtained from (A) a solid catalyst component...
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5354842 |
Method for determining branch distribution of polymer
A branch distribution of a crystalline polymer is determined by melting the polymer at a temperature sufficiently higher than the melting point thereof, then cooling the melted polymer to room...
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5350817 |
Process for the preparation of polyolefins having a broad molecular weight distribution
Polyolefins having a molecular weight distribution M w /M n of ≥3 and which may be monomodal, bimodal or multimodal are obtained by polymerization or copolymerization of olefins of the formula...
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5350818 |
Process for preparing a high density polyethylene of low n-paraffin content and high melt index ratio
A process for producing a high density polyethylene resin which has a negligible n-paraffin content while having a melt index ratio of at least 75 by polymerizing ethylene with a minor amount of a...
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5350816 |
Olefin polymerization process and polymer produced
A polymerization catalyst system is formed by combining an organometal compound and a transition metal compound to produce a catalyst A; and combining catalyst A and a catalyst B comprising a rare...
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5349033 |
Process for the preparation of polyolefin
It is possible to obtain globular polymers in the polymerization of alpha-olefins by means of a highly active, spherical Ziegler catalyst. The polymers have a high bulk density and can be processed...
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5344803 |
Cocatalyst for transition metal-containing α-olefin polymerization catalyst
The present invention is directed to a novel halosilane cocatalyst component which, when used in conjunction with an aluminum containing cocatalyst, is effective in increasing the activity of a...
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5338812 |
Olefin polymerization
A novel polymerization catalyst system comprising a diluent, a substrate, a nickel compound wherein the nickel is in a zero oxidation state and picolinic acid and a method for making such catalyst...
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5331070 |
Process for olefin polymerization
Olefins can be polymerized in the presence of a catalyst system composition comprising chromium supported on an inorganic oxide support, a pyrrole-containing compounds, and a metal alkyl. The use...
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5324799 |
Polyethylene and process of production thereof
Polyethylene having from 1 to 60 methyl branches and from 1 to 60 hexyl or higher branches per 1,000 carbon atoms, a g-value of from 0.5 to 0.9, a limiting viscosity [η] of from 0.005 to 20.0 dl/g...
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5324803 |
Polymer comprising fluoroalkl group, a method of preparation thereof, a surface active agent, a surface treatment agent and a coating composition
A polymer comprising fluoroalkyl group has a structure in which one or two parts of the fluoroalkyl group at the one or both ends of the molecule are linked to a part of alkylene groups or alkylene...
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5324800 |
Process and catalyst for polyolefin density and molecular weight control
Catalysts comprising (a) derivatives of mono, bi and tricyclopentadienyl coordination complexes with a transition metal and (b) and an alumoxane are employed in a process of producing polyolefins...
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5324698 |
New carrier catalyst for the polymerization of ethylene
A problem in the conventional olefin polymerization catalyst systems, the procatalysts of which are based on a solid carrier and a titanium compound and an electron donor on its surface, is that...
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5322910 |
Ethylene polymerization
Olefins are polymerized with a catalyst system composition comprising a nickel compound and an aromatic carboxylic acid wherein there is a heteroatom linkage between the aromatic moiety and the...
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5322911 |
Polymerization process employing metal halide catalyst and polymer produced
A polymerization catalyst is formed by producing a solution of a Group IIA or Group IIB halide and an alcohol; contacting the solution with an organometallic compound to form a soluble complex; and...
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5322830 |
Method for the preparation of catalyst components for the polymerization of ethylene with a relatively narrow molecular weight distribution and protocatalyst composition
The invention relates to a method for the preparation of a supported procatalyst intended for the polymerization of olefins, in which particles are formed from magnesium halide and alcohol, the...
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5320995 |
Catalysts for the polymerization of olefins
A catalyst for the polymerization of olefins, containing magnesium, chlorine, aluminium and at least one transition metal, in a dispersed or emulsified form within an inert diluent, is obtained by:...
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5320994 |
Process for preparing a catalyst for the polymerization of olefins
The process comprises, in a first step, the reduction of a titanium (IV) compound in an α,ω-dihalogenoalkane using a molar excess of at least one halogenated organoaluminium compound in the...
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5321105 |
Polymerization process using a bimodal silica gel as a catalyst support
A bimodal silica gel particle, its method of preparation and its use as a catalyst support in the polymerization of olefins is disclosed. The bimodal silica gel particle exhibits a bimodal pore...
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5317036 |
Gas phase polymerization reactions utilizing soluble unsupported catalysts
Gas phase polymerization processes are disclosed which utilize unsupported soluble transition metal coordination catalysts. The catalysts are introduced into the reactor as a solution.
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5312871 |
Free radical polymerization process
This invention concerns a "living" free radical polymerization process for preparing polymers having a narrow distribution of molecular weights.
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5306796 |
Pliable crystalline polymer and process for its production
An oriented crystalline polymer, which is composed of a crystalline polymer which is oriented, which is pliable in the absence of any plasticizing adjuvant, and which exhibits a tensile modulus E,...
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5306791 |
Ethylene homopolymers and ethylene copolymers and a process for their preparation
Novel ethylene homopolymers and ethylene copolymers which are suitable for film production and have a density from 925 to 940 kg /m 3 , a melt flow index (MFI) of <1 g/10 min at 190° C. and at...
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5302674 |
Dimeric and tetrameric cyclopentadienyl group 6b metal alpha-olefin polymerization catalysts and process for polymerizing alpha-olefins
Disclosed is a catalyst system for the homopolymerization and copolymerization of alpha-olefins having 2-8 carbon atoms, said catalyst system comprising a dimeric or tetrameric cyclopentadienyl...
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5298579 |
Olefin polymerization process
A method of using a catalyst with a suitable cocatalyst in the polymerization or copolymerization of 1-olefins are disclosed. The catalyst is prepared by: a) contacting a Group IIA organometallic...
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5298582 |
Extrudable/coatable ethylene (co)polymers
Improvedly extrudable/coatable ethylene (co)polymers, well adopted for the production of film-coated metal composites, are prepared by radical polymerizing ethylene or recipe thereof including at...
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5296564 |
Process for the polymerization of alpha-olefins
Process for the polymerization of alpha-olefins in the presence of a catalyst, including providing monodisperse microspheroidal particles by spraying an electrostatically charged gellable liquid...
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5296565 |
Olefin polymerization catalyst and olefin polymerization
A solid catalyst for olefin polymerization comprising [A] a particulate carrier composed of (i) an oxide of at least one element selected from among those belonging to the groups of II, III and...
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5292837 |
Process for the preparation of ethylene (co)polymers
For the homopolymerization of ethylene or for the copolymerization of ethylene with other 1-olefins, a catalyst is used which comprises a trialkylaluminum compound and the entire product from the...
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5292584 |
Ultrahigh molecular weight polyethylene and lightly-filled composites thereof
Homogeneous, particulate composites are provided, of about 75-99.5 weight percent ultrahigh molecular weight polyethylene (UHMWPE) and about 0.5-25 weight percent of at least one filler compound,...
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5286819 |
Polymerization process employing transition metal catalyst and polymer produced
A polymerization catalyst is formed by contacting an alcohol with a transition metal compound. In a second embodiment, a solution is formed by contacting a Group IIA or Group IIB metal halide and...
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5283301 |
Olefin polymerization with particulate gel-containing catalyst
Olefin polymerization catalysts and processes for preparing and using the catalysts are provided. The catalysts are prepared by forming a particulate gel containing aluminum and magnesium...
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5281679 |
Catalyst and method of broadening polymer molecular weight distribution and increasing polymer tensile impact strength and products made thereof
A catalyst and method of producing polyolefins having broadened molecular weight distributions and enhanced tensile impact strengths utilizing a silica supported metallocene-alumoxane catalyst...
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5276114 |
Olefin polymerization catalyst and polymerization process
A method for making polymerization catalysts is disclosed which comprises contacting a soluble complex prepared from the combination of a metal dihalide and a transition metal compound with a...
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5270275 |
Solid component of catalyst for the homo- and co-polymerization of ethylene
A solid component of catalyst for the (co)polymerization of ethylene, including magnesium, halogen and titanium, is prepared: (i) by dissolving a magnesium dialkyl, a silicon halide and at times...
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5268440 |
Process for the preparation of polyethylenes
For the preparation of polyethylenes using a diphenyl ethane derivative as C-C labile polymerization initiator, 1 to 40 mole 3,4-dimethyl-3,4-diphenyl hexane, based on 1 million mole ethylene used,...
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5258344 |
Transition metal catalyst, method of producing the catalyst, polymerization process employing the catalyst, and polymer produced by the polymerization process
A polymerization catalyst is formed by contacting an alcohol with a transition metal compound. In a second embodiment, a solution is formed by contacting a Group IIA or Group IIB metal halide and...
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5258475 |
Catalyst systems for polymerization and copolymerization of olefins
The catalyst systems of this invention consist of catalyst precursors which are metallocene derivatives and cocatalysts. The cocatalysts comprise mixtures of: (i) trimethylaluminum, and (ii) at...
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5246900 |
Olefin polymerization catalysts and processes of making the same
Olefin polymerization catalysts and processes for preparing and using the catalysts are provided. The catalysts are prepared by forming a particulate gel containing aluminum and magnesium...
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5234731 |
Thermoplastic multi-layer packaging film and bags made therefrom having two layers of very low density polyethylene
A heat-shrinkable, oriented film having two layers of different very low density polyethylenes is disclosed. The melt index of the polyethylenes differs by about 1 or more decigrams/minute. The...
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5231119 |
Crystalline olefin polymers and copolymers in the form of spherical particles at high porosity
Crystalline olefin polymers and copolymers in the form of spherical particles having porosity (expressed in percentage of voids) higher than 15%, with more than 90% of the pores having a pore...
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5227440 |
Mono-Cp heteroatom containing Group IVB transition metal complexes with MAO: supported catalysts for olefin polymerization
The invention is a supported catalyst system including an inert support material, a Group IV B transition metal component and an alumoxane component which may be employed to polymerize olefins to...
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5225502 |
Method of producing polyolefin
A method of producing a polyolefin, which comprises polymerizing at least one olefin in the presence of a catalyst system comprising (A) a catalyst component prepared by bringing ethylene and/or...
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5221720 |
Fluorided aluminas, catalysts, and polymerization processes
High surface are aluminas are pre-calcined to form gamma-alumina. In one embodiment, the gamma-alumina is treated with an anhydrous solution of a fluorine-containing compound. In a second...
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5210161 |
Supported vanadium dihalide-ether complex catalyst
A vanadium dichloride-ether complex is carried on a porous support. This complex can be produced by either forming VCl 2 and thereafter complexing the material with an ether or forming an ether...
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5208303 |
Process for preparing a vanadium-based catalyst suitable for olefin polymerization
The present invention relates to a process for preparing a Ziegler-Natta type catalyst based on a vanadium compound precipitated on a MgCl 2 spherical support. The catalyst preparation consists of...
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5204303 |
Preparation and use of a new ziegler-natta catayst component
The invention relates to a method for the preparation of a supported procatalyst intended for the polymerization of olefines, in which particles are formed of magnesium dihalide and alcohol, the...
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5202397 |
***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST***
Olefin polymerization method
A multiple site solid catalyst component capable of producing polyolefins having a broad or multimodal molecular weight distribution, such as a bimodal molecular weight distribution, is prepared by...
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5200486 |
Process for separating volatile components from reaction mixtures obtained through high-pressure polymerization
Separation of volatile components from the polymer melts formed during the homopolymerization of ethylene or the copolymerization of ethylene with other copolymerizable compounds at elevated...
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5200478 |
Method for activating supported chromium oxide catalysts and olefin polymerization process carried out therewith
A method for activating supported chromium oxide catalysts in which a chromium-containing catalyst on a silica-containing base is first heated in an oxidizing atmosphere at temperatures up to about...
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