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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...
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.
7566677 De-foaming spray dried catalyst slurries  
A method for preparing a spray dried catalyst and a low viscosity, low foam spray dried catalyst system for olefin polymerization are provided. In one aspect, the method includes preparing a...
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...
7517940 Catalyst composition including transition metal complexes and olefin polymerization using the same  
Provided is catalyst composition including a transition metal complex precatalyst represented by Formula 1; a first cocatalyst represented by Formula 2 which is an alkylaluminum compound; and a...
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...
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,...
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...
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...
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...
7384885 Catalyst activation and resins therefrom  
The present invention relates to the removal of hydrocarbon residues from a catalyst and more specifically the air activation of a catalyst containing hydrocarbon residues. It also relates to...
7348384 Supported, titanized chromium catalyst and its use for preparing homopolymers and copolymers of ethylene  
Novel supported, titanized chromium catalysts for the homopolymerization of ethylene and the copolymerization of ethylene with α-olefins, a process for preparing them and to their use for the...
7348383 Spray-dried, mixed metal ziegler catalyst compositions  
A Ziegler-Natta catalyst composition comprising a solid mixture formed by halogenation of: Al) a spray-dried catalyst precursor comprising the reaction product of a magnesium compound, a...
7326760 Production of broad molecular weight polyethylene  
Broad molecular weight polyethylene and polyethylene having a bimodal molecular weight profile can be produced with chromium oxide based catalyst systems employing alkyl silanols. The systems may...
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...
7294680 Method of producing conjugated diene polymers with narrow molecular weight distribution and polymer produced  
Conjugated diene polymers having good wear resistance, mechanical properties, storage stability, processability and a reduced cold flow are produced by polymerizing a conjugated diene compound with...
7291575 Active, heterogeneous bi- or tri-dentate catalyst  
A catalyst composition, and olefin polymerization process using same, formed from a mixture of a non-aluminoxane aluminum compound, an inorganic oxide and a transition metal bidentate or tridentate...
7271124 Process to produce polymers  
A process to produce ethylene polymers is provided.
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...
7172986 Catalytic composition and its preparation and use for preparing polymers from ethylenically unsaturated monomers  
A catalytic composition, including a cationic metal-pair complex, is disclosed, along with a method for its preparation. A method for the polymerization of ethylenically unsaturated monomers using...
7148175 Catalyst for olefin polymerization  
A polymerization catalyst system, containing a specified ratio of two iron complexes of a bisimine of 2,6-diacylpyridine or a bisimine of a 2,6-pyridinedicarboxaldehyde which produce polyolefins of...
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...
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...
7087686 Chain growth reaction process  
A process is disclosed for the preparation of zinc alkyl chain growth products via a catalysed chain growth reaction of an alpha-olefin on a zinc alkyl, wherein the chain growth catalyst system...
7056991 Method for transitioning between Ziegler-Natta and metallocene catalysts in a bulk loop reactor for the production of polypropylene  
The present invention relates to propylene polymerization process in a bulk loop reactor, and particularly to propylene polymerization process for polymerizing commercial quantities of...
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...
7022781 Polymerization catalyst systems and processes using alkyl lithium compounds as a cocatalyst  
A catalyst system composition comprising a chromium compound supported on a silica-titania support, wherein said catalyst system has been reduced with carbon monoxide, and a cocatalyst selected...
7019090 Catalytic component for the polymerization of olefins obtained by impregnation of a prepolymer with a solution of a catalytic component, prepolymer obtained from the catalytic component and polymerization process using said catalytic component  
The present invention relates to a catalytic component for the polymerization of olefins combining a number of catalytic components for the polymerization of olefins and to a process for preparing...
7019089 Suspended chrome catalyst containing titanium and the use thereof for producing ethylene homopolymers and copolymers  
Novel supported, titanized chromium catalysts can be used for the homopolymerization of ethylene and the copolymerization of ethylene with α-olefins.
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...
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...
6992033 Process for preparation of catalyst composition for ethylene polymerization  
Process for preparing a catalyst composition for ethylene polymerization or copolymerization, with the steps of: (a) treating at least one magnesium alkoxide compound with the effluent waste from 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...
Matches 1 - 50 out of 260 1 2 3 4 5 6 >