|
Match
|
Document |
Document Title |
|
|
7619047 |
Dual metallocene catalysts for polymerization of bimodal polymers
This invention relates to catalyst compositions, methods, and polymers encompassing at least one first Group 4 metallocene compound comprising bridging η 5 -cyclopentadienyl-type ligands, in...
|
|
|
7592401 |
Multinuclear half metallocene catalyst and method for preparing syndiotatic polystyrene using the same
Disclosed is a multinuclear transition metal half metallocene catalyst having a multinuclear half metallocene structure in which a transition metal of groups 3 to 10 on periodic table is connected...
|
|
|
7589162 |
Polyethylene compositions and pipe made from same
A polymer composition comprising a density equal to or greater than about 0.947 g/cc, a high load melt index from about 1 g/10 min to about 30 g/10 min, and a tensile natural draw ratio less than...
|
|
|
7531602 |
Polymer blends
A blend of polymers comprising from 5 to 95 weight % of a polymer having a high molecular weight made using a single site type catalyst and from 95 to 5 weight % of a polymer having a lower...
|
|
|
7459509 |
Polyethylene resins
The invention provides ethylene/α-olefin copolymers exhibiting improved environmental stress cracking resistance properties, and methods for the production of the copolymers in a single reactor by...
|
|
|
7452946 |
Ethylene polymer
An ethylene-based polymer which is a copolymer obtained from ethylene and a C3 to C10α-olefin and satisfies the following requirements (i), (ii), (iii) and (iv) simultaneously provides a...
|
|
|
7449527 |
Polyolefin production
Provided is a process for producing a polyolefin having a multimodal molecular weight distribution, which process comprises: (a) polymerizing a first olefin monomer in the presence of an...
|
|
|
7442750 |
Supported olefin polymerization catalyst
Supported catalyst systems are provided comprising (a) a transition metal compound, (b) an activator comprising (iii) an aluminoxane or (iv) a Group lilA metal or metalloid compound, and (c) a...
|
|
|
7410926 |
Polymerization process using a supported, treated catalyst system
The present invention relates to a supported, treated catalyst system and its use in a process for polymerizing olefin(s). More particularly, it provides a supported, treated catalyst system...
|
|
|
7396888 |
Catalyst system comprising a mixture of catalyst components for producing a polyolefin blend
Provided is a catalyst system for producing a polyolefin blend, which catalyst system comprises a mixture including the following catalyst components: i) a catalyst component A capable of producing...
|
|
|
7365137 |
Multistep process for the (co) polymerization of olefins
A multistep process for the polymerization of one or more olefins comprising a first step of polymerizing one or more of said olefins in the presence of a catalyst of the Ziegler-Natta type, a step...
|
|
|
7323524 |
Tandem tetramerisation-polymerisation of olefins
The invention provides a process for polymerising olefins to branched polyolefins in the presence of a polymerisation catalyst and a cocatalyst, wherein the cocatalyst produces 1-octene in a...
|
|
|
7321015 |
Adjusting polymer characteristics through process control
Properties of a polymer produced using a dual catalyst on the same support, such as polydispersity and comonomer incorporation, may be controlled by controlling reaction parameters such as...
|
|
|
7312283 |
Polymerization catalysts and process for producing bimodal polymers in a single reactor
Catalyst compositions comprising a first metallocene compound, a second metallocene compound, an activator-support, and an organoaluminum compound are provided. Methods for preparing and using such...
|
|
|
7304118 |
Polyethylene pipe having better melt processibility and high resistance to stress and method of preparing the same using metallocene catalyst
An ethylene-based copolymer for non-crosslinked water supply pipe is provided. The ethylene-based copolymer is prepared using a supported hybrid metallocene catalyst and has a dimodal or broad...
|
|
|
7294681 |
Mutliple catalyst system for olefin polymerization and polymers produced therefrom
This invention relates to a polymer of one or more C3 to C40 olefins, optionally one or more diolefins, and less than 15 mole % of ethylene, and polymerization processes for producing the same.
|
|
|
7238756 |
Polymerization process and control of polymer composition properties
Methods of controlling the flow index and/or molecular weight split of a polymer composition are disclosed. The method of producing a polymer composition in one embodiment comprises incorporating a...
|
|
|
7223824 |
Multinuclear transition metal compound and catalyst system including the same
A multinuclear transition metal compound which has two or more catalytic active sites, and is useful in preparing the olefin polymer and copolymer, is disclosed. The multinuclear transition metal...
|
|
|
7220805 |
Process for producing contact product; catalyst component for addition polymerization; process for producing catalyst for addition polymerization; and process for producing addition polymer
There are provided (1) a process for producing a contact product, which comprises the step of contacting at least a phthalocyanine complex, a porphyrin complex, or their combination with a...
|
|
|
7196147 |
Olefin polymerization process with improved operability and polymer properties
Ethylene and optional comonomers are polymerized in the presence of an organozinc compound and a catalyst system to produce an ethylene polymer. The catalyst system comprises a bridged...
|
|
|
7192902 |
Polymerization process with mixed catalyst compositions
The application describes a mixed olefin polymerization catalyst composition comprising a support, a reaction product of at least one first organometallic compound and a first activator capable of...
|
|
|
7163906 |
Organochromium/metallocene combination catalysts for producing bimodal resins
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...
|
|
|
7144964 |
Solution polymerization process utilizing preassembled bimetallic Ziegler-Natta catalyst
A high-temperature solution process for polymerizing ethylene is disclosed. The polymerization is performed in the presence of a preassembled bimetallic Ziegler-Natta catalyst and an aluminum...
|
|
|
7141632 |
Mixed metallocene catalyst systems containing a poor comonomer incorporator and a good comonomer incorporator
The present invention provides polymerization catalyst compounds, catalyst systems including these catalyst compounds, and to their use in the polymerization of ethylene and at least one comonomer....
|
|
|
7132486 |
Linear low density polyethylenes with high melt strength and high melt index ratio
Linear low density polyethylenes (LLDPEs) that have relatively high melt index ratios (MIR) and relatively high melt strength (MS) are described. This combination of melt properties is achieved by...
|
|
|
7129302 |
Bimetallic catalyst for producing polyethylene resins with bimodal molecular weight distribution, its preparation and use
Bimetallic catalyst for producing polyethylene resins with a bimodal molecular weight distribution, its preparation and use. The catalyst is obtainable by a process which includes contacting a...
|
|
|
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...
|
|
|
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...
|
|
|
7084216 |
Process for the polymerization of olefins
The present invention relates to a process for homopolymerization of ethylene or copolymerization of ethylene with alpha-olefins by contacting ethylene or ethylene and alpha-olefin with a catalyst...
|
|
|
7067587 |
Polyolefin macromonomer, graft polymer obtained from the polyolefin macromonomer, and use thereof
A novel graft polymer useful in various uses that has a polyolefin backbone having polyolefin segments excellent in moldability can be obtained by homopolymerizing a novel polyolefin macromonomer...
|
|
|
7053157 |
Method for production of multimodal polyolefins of tunable composition, molecular weight, and polydispersity
The present invention relates to a method of producing multimodal polyolefins using at least one or more activated metallocene catalysts. The activated metallocene catalysts are used in combination...
|
|
|
7001962 |
Olefin polymerization catalyst system
A catalyst system comprises 1) a group 4 organometallic catalyst and 2) an activator comprising a solid zirconium acid component and a metal alkyl. The catalyst system is inexpensive and is highly...
|
|
|
6995235 |
Methods of producing polyolefins and films therefrom
Films and methods of forming films comprising first combining in a reactor olefins, a catalyst composition and an activator; wherein the activator is present from less than 50 wt % in a diluent by...
|
|
|
6995219 |
Olefin polymerization process
The invention relates to a process for the preparation of a multimodal A-olefin polymer comprising polymerizing in a polymerization stage at least one A-olefin in the presence of a multisite...
|
|
|
6995218 |
Metallocene catalysts for olefin or styrene polymerization and polymerization method using the metallocene catalysts
The new metallocene catalysts according to the present invention are prepared by reacting a metallocene compound with a compound having at least two functional groups. The metallocene compound is a...
|
|
|
6992034 |
Catalyst component for olefin polymerization
A solid catalyst component useful for the (co)-polymerization of olefins is disclosed. The catalyst component is prepared by reacting an activated magnesium halide composite support with a...
|
|
|
6982305 |
Olefin polymerization in the presence of a dehydrogenation catalyst
A process for polymerizing olefins is disclosed. The process polymerizes an olefin in the presence of a dehydrogenation catalyst and an olefin polymerization catalyst. The dehydrogenation catalyst...
|
|
|
6964937 |
Bimetallic catalyst for producing polyethylene resins with bimodal molecular weight distribution, its preparation and use
Bimetallic catalyst for producing polyethylene resins with a bimodal molecular weight distribution, its preparation and use. The catalyst is obtainable by a process which includes contacting a...
|
|
|
6962889 |
Spherical catalyst for olefin polymerization
Disclosed are catalyst systems and methods of making the catalyst systems/supports for the polymerization of an olefin containing a solid titanium catalyst component having a substantially...
|
|
|
6943226 |
Multinuclear transition metal catalysts for preparation of multimodal polymer compositions
Novel compounds are provided that are useful as catalysts, particularly in the polymerization of addition polymerizable monomers such as olefinic or vinyl monomers. The compounds are multinuclear...
|
|
|
6943225 |
Multinuclear metallocene catalyst
The present invention relates to a multinuclear metallocene catalyst for olefin polymerization and a process for olefin polymerization using the same, in which the multinuclear metallocene catalyst...
|
|
|
6943134 |
Bimodal polyolefin production process and films therefrom
A process of producing a bimodal polyolefin composition is described, which includes in one embodiment contacting monomers with a supported bimetallic catalyst composition for a time sufficient to...
|
|
|
6921795 |
Manufacture of polyethylenes
Blends of two or more polyethylenes are made by reacting ethylene with an oligomerization catalyst that forms α-olefins, and two polymerization catalysts, one of which under the process conditions...
|
|
|
6906153 |
Dual-site olefin polymerization catalyst composition
The invention provides a catalyst system (preferably a heterogeneous catalyst system) comprising: a transition metal bisphenolate catalyst (preferably a group 4 to 6 transition metal bisphenolate...
|
|
|
6897273 |
Catalyst composition, method of polymerization and polymer therefrom
This invention relates to a process to polymerize olefin(s) comprising combining a solution, slurry or solid comprising one or more bulky ligand metallocene catalyst compounds, an optional support,...
|
|
|
6894129 |
Multinuclear half metallocene catalyst and preparation of styrene polymer using the same
The present invention relates to a catalyst for preparing vinyl aromatic polymer and styrene polymerization using the same, and particularly to a transition metal half metallocene catalyst with a...
|
|
|
6894128 |
Catalyst composition, method of polymerization, and polymer therefrom
Catalyst compositions and methods useful in polymerization processes utilizing at least two metal compounds are disclosed. At least one of the metal compounds is a Group 15 containing metal...
|
|
|
6870015 |
Catalyst component for addition polymerization, process for producing catalyst for addition polymerization and process for producing addition polymer
There are provided: (I) a catalyst component for addition polymerization comprising: (i) a transition metal compound having (a) two cyclopentadiene type anion skeleton-carrying groups, which are...
|
|
|
6864210 |
Bimetallic olefin polymerization catalysts containing indigoid ligands
A catalyst system useful for polymerizing olefins is disclosed. The catalyst system comprises an activator and a bimetallic complex that incorporates two Group 3 to 10 transition metal atoms, which...
|
|
|
6861485 |
Multi-catalyst system for olefin polymerization
A multi-catalyst system is disclosed. The catalyst system comprises catalyst A and catalyst B. Catalyst A comprises a supported bridged indenoindolyl transition metal complex. Catalyst B comprises...
|