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7339019 |
Ethylene-α-olefin copolymer
A copolymer having monomer units derived from ethylene and monomer units derived from an α-olefin of 3 to 20 carbon atoms, a density of 906 to 970 kg/m 3 and an activation energy of flow of 50...
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7335716 |
Ethylene (co)polymers and uses thereof
An ethylene (co)polymer of the present invention is a (co)polymer with excellent moldability and mechanical properties and either an ethylene homopolymer or a copolymer of ethylene and an α-olefin...
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7335715 |
Ethylene-alpha-olefin copolymer
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 density of 906 to 970 kg/m 3 , an activation energy...
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7271221 |
Method of making interpolymers and products made therefrom
Olefin polymers having a melt strength of about 5cN at 190 ° C., and when made into a film have a CD shrink of at least 20%. Some of the polymers have a comb-like structure with at least 0.3...
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7238818 |
Heterocyclic metallocenes and polymerization catalysts
A new class of heterocyclic metallocenes, a catalytic system containing them and a process for polymerizing addition polymerizable monomers using said catalytic system are disclosed; the...
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7238765 |
High density polyethylene and insulation compositions for wire and cable
High density polyethylene having reduced melt elasticity and a reduced level of highly short-chain branched polymer molecules and wire and cable insulation compositions based thereon having...
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7208559 |
Ethylened polymer and molded object obtained therefrom
An ethylene-based polymer which is an ethylene/C4 to C10 α-olefin copolymer and satisfies the following requirements [k1] to [k3]: [k1] melt flow rate (MFR) under a loading of 2.16 kg at 190° C....
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7157531 |
Methods for producing polymers with control over composition distribution
Methods for controlling a melt viscosity of a polyolefin, controlling comonomer distribution of a polyolefin, achieving a targeted melt viscosity of a polyolefin, and films made from such...
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7129197 |
Synthesis of poly-alpha olefin and use thereof
One or more oligomers of an olefin are prepared in the presence of a single-site catalyst. Preferably, the olefin is an α-olefin, and the oligomers are a poly-alpha-olefin (PAO). The PAO so...
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7125946 |
Ethylene copolymer
The invention provides an ethylene-α-olefin copolymer which is superior in extrusion molding processability. The present invention is to provide a copolymer of ethylene and α-olefin of from 4 to...
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7119153 |
Dual metallocene catalyst for producing film resins with 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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7101939 |
Ethylene/α-olefin copolymer made with a non-single-site/single-site catalyst combination, its preparation and use
An ethylene/α-olefin copolymer comprising a component produced by a non-single-site polymerization catalyst and a component produced by a single-site polymerization catalyst, its preparation and...
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7094857 |
Ethylene polymers and copolymers with high optical opacity
This invention relates to the field of metal-catalyzed olefin polymerization methods and the polymers and films prepared therefrom. In one aspect, this invention provides polyethylene and...
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7081285 |
Polyethylene useful for blown films and blow molding
Blown films and blow molded objects may be prepared using a polyethylene composition comprising a unimodal metallocene catalyzed polyethylene copolymer. The polyethylene copolymer has high melt fow...
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7071137 |
Method of making a ziegler-natta catalyst
A method for making a Ziegler-Natta catalyst support includes the steps of contacting a fumed silica with a surface modifying agent such as a compound having the formula RMgX MgR′R″ wherein R,...
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7041765 |
Films comprising isotactic propylene copolymers
Films with excellent machine direction (MD) tear properties comprise at least one layer made from a polymer comprising: (A) at least 50 weight percent (wt%) propylene; and (B) at least 5 wt %...
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6995216 |
Process for manufacturing single-site polyolefins
A dual olefin polymerization process is disclosed. The process uses a bridged indenoindolyl ligand-containing Group 4 transition metal complex and an activator. It is carried out in multiple stages...
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6992152 |
Apparatus and method for controlling olefin polymerization process
Apparatus for olefin polymerization includes one or more shell and tube olefin polymerization reactors, each of which has an olefin polymerization reaction mixture inlet connection and a crude...
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6988022 |
Method for online estimation of reactor split for multimodal polyolefins
The present method is directed to techniques for estimating and periodically controlling the reactor split of alpha-olefin polymerizations using multiple catalysts that selectively incorporate...
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6977283 |
Polymerization process
The present invention relates to a process for polymerizing monomer and comonomer(s) utilizing a bulky ligand transition metal metallocene-type catalyst or catalyst system, where the process is...
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6956094 |
Bimodal polyolefin
The invention provides for polymerization catalyst compositions, and for methods for introducing the catalyst compositions into a polymerization reactor. More particularly, the method combines a...
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6956088 |
Polyethylene films with improved physical properties
Metallocene catalyzed polyethylenes are found to have improved physical properties, improved processability and improved balance of properties. Surprisingly, there is a direct relationship between...
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6921798 |
Polymerization process
Polymerization processes are disclosed for producing polyethylene having a target density and improved environmental stress resistance. Ethylene and optionally one or more α-olefin comonomers,...
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6911508 |
Class of metallocenes and method of producing polyethylene
The invention provides a catalyst system and a method of making polyethylene using the catalyst system, the method comprising combining ethylene; an activator; and a metallocene catalyst compound;...
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6903170 |
Olefin polymerization process using triisobutylaluminum as a scavenger
Ethylene and optional comonomers are polymerized using a supported metallocene catalyst, an alumoxane activator, and triisobutylaluminum (TIBAL). A silica support is first pretreated with a silane...
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6897272 |
α-olefins and olefin polymers and processes therefor
Disclosed herein are processes for polymerizing ethylene, acyclic olefins, and/or selected cyclic olefins, and optionally selected olefinic esters or carboxylic acids, and other monomers. The...
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6891002 |
Process for producing polyolefin
A process for producing a polyolefin according to the present invention comprises (co) polymerizing one or two or more α-olefins in a vapor phase in a fluidized-bed reactor, wherein the...
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6891001 |
Process for the gas phase polymerization of olefins
A process for preparing and controlling the density of high density polyethylene in the gas phase comprising contacting ethylene or a mixture of ethylene and one or more alpha-olefins with a...
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6887957 |
Process for the gas-phase (co-)polymerization of olefins in a fluidized bed reactor
A process for the gas-phase (co-)polymerization of olefins in a fluidised bed reactor using a Ziegler-Natta type catalyst characterised in that the polymerisation is performed in the presence of an...
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6878784 |
Polymer composition for pipes
A multimodal polymer composition for pipes is disclosed. The polymer is a multimodal polyethylene with a density of 0.930-0.965 g/cm 3 , an MFR 5 of 0.2-1.2 g/10 min, an M n of 8000-15000, an M w...
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6867278 |
Olefin polymers, method of making, and use thereof
The present invention is directed to homo-polymers and copolymers of mono-1-olefins, a method of making such polymers,and uses of such polymers. Polymers of the present invention are formed by...
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6867277 |
Ethylene-based polymer resin
An ethylene-based polymer resin which is obtained by copolymerizing ethylene with an α-olefin having 5 to 20 carbon atoms, and has a melt flow rate (MFR) measured at 190° C. under a load of 21.18...
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6864332 |
Process for the gas phase polymerization and copolymerization of olefin monomers
A process for polymerizing monomers in the gas phase, in fluidized bed reactors is described, where unsaturated, gas phase monomers are fed into the reactors in the presence of a mixture of inert...
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6858681 |
Process for producing olefinic polymer
The process for producing an olefinic polymer comprises introducing a saturated aliphatic hydrocarbon in a liquid phase state and in a vapor phase state into the aforementioned fluidized-bed and...
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6855781 |
Process to produce polymers
A process to produce ethylene polymers is provided. Particularly, a process to produce ethylene polymers having a broad molecular weight distribution is provided. More particularly, a process to...
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6849699 |
Vapor-phase fluidized-bed process and ethylene homopolymers and copolymers produced thereby
A continuous vapor-phase fluidized-bed process for the preparation of ethylene homopolymers and copolymers having a density of from 0.87 to 0.97 g/cm 3 in which ethylene or mixtures of ethylene...
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6841643 |
Additive for communication cable filler and filler for communication cable
The additive (b) for a communication cable filler according to the present invention contains as a main component an ethylene/α-olefin copolymer (a) having a number-average molecular weight (Mn),...
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6841623 |
Low molecular weight nitrile rubber
The present invention relates to nitrile rubber polymers having lower molecular weights and narrower molecular weight distributions than those known in the art. The present invention also relates...
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6812314 |
Thermally responsive polymer materials and uses thereof
The subject invention pertains to branched polyolefin materials that exhibit temperature-sensitive permeability. The subject invention also concerns a package including a polymer material that...
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6803436 |
Transportable and safely packaged organic peroxide formulations comprising reactive phlegmatisers
The invention relates to a method to safely produce, handle and transport packaged organic peroxide formulations comprising a reactive phlegmatiser and to the use of such packaged material in...
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6800711 |
Olefin-based polymer
Long-chain, branched, propylene-based polymers, of which the melt index and the molecular weight distribution and the melt tension and the limiting viscosity both satisfy specific requirements,...
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6800704 |
Olefin polymerization process with alkyl-substituted metallocenes
The invention comprises an olefin polymerization process comprising contacting ethylene alone or with one or more olefinically unsaturated comonomers with a Group 3-6 metallocene catalyst compound...
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6762254 |
Ethylene(meth)acrylate copolymers with low residual content in comonomers
Copolymers of ethylene have from 1 to 30 mol % of alkyl(meth)acrylates and, if desired, other comonomers, and have a residual comonomer content of less than 0.5% by weight in the copolymer. A...
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6759489 |
Fluidized bed methods for making polymers
The invention relates to continuous gas fluidized bed methods for making a polymer featuring a condensing agent in a recycle stream; and also to methods for monitoring and providing continuity in a...
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6747114 |
Polypropylene-based adhesive compositions
An adhesive blend is described that can include a semi-crystalline copolymer of propylene and at least one comonomer selected from the group consisting of ethylene and at least one C 4 to C 20 ...
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6723810 |
Process for making ultra-low molecular weight ethylene polymers and blends thereof
Process for making a non-pourable ultra-low molecular weight ethylene polymer composition and blends thereof. Such polymer compositions tend to have longer lamella and a greater degree of...
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6710146 |
Composition and process for controlled radical polymerization using multifunctional initiator/regulator compounds
The present invention relates to a polymerizable composition comprising a) at least one ethylenically unsaturated monomer and b1) at least one multifunctional triazinyl based 2,2,6,6...
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6693155 |
Propylene polymerization process
A process for polymerizing propylene is disclosed. The propylene is polymerized with a catalyst system which comprises an activator and a [1,2-b]indenoindolyl Group 4-6 transition metal complex...
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6689857 |
High density polyethylene film with high biaxial orientation
A high density polyethylene (HDPE) film is provided having high-biaxial orieniation. The film includes HDPE having a density of at least about 0.940, and a melt index of from about 0.5 to about 10....
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6677408 |
Method for producing ethylene homo-and copolymers by intensively mixing a reactive reaction component with a mobile flow medium
The invention relates to a method for producing ethylene homo- and copolymers in a tubular reactor at pressures above 1000 bar and temperatures in the range from 120 to 350° C. by free-radical...
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