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8173569 Robust spray-dried ziegler-natta procatalyst and polymerization process employing same  
A Ziegler-Natta procatalyst composition in the form of solid particles and comprising magnesium, halide and transition metal moieties, said particles having an average size (D50) of from 10 to 70...
7985817 Homogeneous catalyst system for producing ethylene homopolymer or ethylene copolymers with alpha-olefins  
Disclosed is a homogeneous catalyst system for producing an ethylene homopolymer or an ethylene copolymer with α-olefin. Specifically, this invention pertains to a transition metal catalyst which ...
7977437 Process for producing polydienes  
A process for preparing a polydiene, the process comprising the step of polymerizing conjugated diene monomer in the presence of a dihydrocarbyl ether, where said step of polymerizing employs a...
7956139 Polymerization catalysts for producing polymers with high comonomer incorporation  
The present techniques relate to catalyst compositions, methods, and polymers encompassing a Group 4 metallocene compound comprising bridged η5-cyclopentadienyl-type ligands, typically in ...
7825201 Process for producing polydienes  
A process for preparing a polydiene, the process comprising the step of polymerizing conjugated diene monomer in the presence of a dihydrocarbyl ether, where said step of polymerizing takes place...
7820580 Nickel-based catalysts for preparing high cis 1,4-polydienes  
A nickel-carbene polymerization catalyst system for preparing high cis polydienes is provided. The catalyst system comprises (a) a nickel N-heterocyclic carbene complex, (b) an organoaluminum...
7811956 Supported olefin polymerization catalyst  
A supported catalyst system comprises (a) a dehydrated support material, (b) a transition metal compound, and (c) an activator and is characterised in that the support material has been pretreated...
7799721 Polymerization catalysts for producing polymers with high comonomer incorporation  
The present techniques relate to catalyst compositions, methods, and polymers encompassing a Group 4 metallocene compound comprising bridged η5-cyclopentadienyl-type ligands, typically in ...
7741418 Process for producing polydienes  
A process for preparing a polydiene, the process comprising the step of polymerizing conjugated diene monomer in the presence of a dihydrocarbyl ether, where said step of polymerizing employs a...
7691957 Butadiene-based polymer and method of producing the same as well as rubber composition and tire using the same  
This invention is concerned with a butadiene-based polymer having a high cis-1,4 bond content, a low vinyl bond content and a molecular weight distribution of a specified range, and more...
7662894 Polymer supported metallocene catalyst composition for polymerizing olefins  
A catalyst composition for polymerizing olefins to polymers having bimodal molecular weight distribution comprises two transition metal-containing metallocene compounds, a magnesium compound, an...
7572867 Polymerization process for producing polydienes  
There is disclosed a process for producing a conjugated diene-containing polymer wherein a stream comprising conjugated diene monomer and a specified catalyst, that includes a lanthanide compound...
7468416 Catalyst composition for olefin polymerization  
A process for the preparation of a catalyst system includes the steps of combining a Lewis base, an organic compound having at least one functional group containing active hydrogen, and an...
7429635 Preparation of ultra high molecular weight linear low density polyethylene  
Disclosed is a method of preparing an ultra-high molecular weight, linear low density polyethylene with a catalyst system that comprises a bridged indenoindolyl transition metal complex, a...
7396889 Method for preparing a diene elastomer  
A method for preparing a diene elastomer, such as a butadiene homopolymer or copolymer, in particular, a polybutadiene, with a high level of cis-1,4 linkages that has both a Mooney viscosity...
7288611 Methods for preparing a rare-earth cis-1,4-polybutadiene rubber with a controlled molecular weight distribution  
Disclosed herein are a method for preparing a cis-1,4-polybutadiene with a controlled molecular weight distribution, comprising polymerizing butadiene monomers using a rare-earth catalyst system...
7230056 Catalyst preparation method  
A two-step catalyst preparation method is disclosed. First, a support is combined with an indenoindolyl Group 3-10 metal complex and a first activator comprising an alkyl alumoxane to give a...
7214745 Process for producing polymer  
A process for producing an olefin polymer with high polymerization activity without using an expensive co-catalyst or using a limited amount of the co-catalyst, more particularly a process for...
7214638 Olefin polymerization catalyst composition comprising group 13 amide derivatives  
Catalyst compositions that are highly tolerant of catalyst poisons for use in addition polymerizations comprising a catalytic derivative of a Group 4 metal complex, a cocatalyst, and a Group 13...
7208441 Polymerization catalyst systems and processes therefor and therewith  
A copolymer of ethylene and a higher alpha olefin, preferably 1-hexene, can be produced using an activated chromium containing catalyst system and a cocatalyst selected from the group consisting of...
7202315 Process for the preparation of ethylene polymers  
A process for polymerizing ethylene comprising contacting under polymerization condition ethylene and optionally one or more olefins with a catalyst system obtainable by contacting: a bis amido...
7169870 Method for preparing butadiene/isoprene copolymers and resulting copolymers  
The present invention relates to a process for the preparation random copolymers of butadiene and isoprene, essentially consisting of reacting a catalytic system in the presence of butadiene and...
7157533 Process of obtaining an isoprene-enriched FCC C5 fraction and selective polymerization of isoprene from said fraction  
A process is described for obtaining from an “FCC” initial C5 fraction which is enriched with isoprene and purified and usable for the selective polymerization of isoprene. A process is also des...
7151146 Neodymium-carbon nanotube and method of preparing high 1,4-cis-polybutadiene using the same  
The present invention relates to a method for preparing neodymium-carbon-nanotube and a process for preparing 1,4-cis-polybutadiene utilizing the same and more particularly,...
7101940 Chemical compound, method for the production thereof and its use in catalyst systems for producing polyolefins  
The invention relates to a chemical compound of formula (I), wherein M1 represents an element selected from main groups II, III or IV of the periodic table of elements; x is equal to 1, 2, 3 or 4;...
7078466 Process for the preparation of branched polydienes in the presence of catalysts based on rare-earth  
A process is described for the preparation of polydienes with a low vinyl content and having a branched structure effected by means of the polymerization of conjugated dienes in the presence of...
7056998 Catalytic system for the preparation of polybutadienes and preparation process  
The present invention relates to a catalytic system usable for the preparation of polybutadienes by polymerisation, to a process for the preparation of said catalytic system and to a process for...
7026415 Clathrochelates as olefin polymerization catalyst components  
Catalyst systems and methods for olefin polymerization are disclosed. The polymerizations are performed in the presence of a clathrochelate which comprises a transition metal ion and an...
7009014 Process for the polymerization olefins  
A process for polymerizing an olefin is capable of polymerizing an olefin with excellent polymerization activity, and comprises polymerizing or copolymerizing an olefin at a polymerization reaction...
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...
6992157 Synthetic polyisoprenes and a process for their preparation  
The present invention provides synthetic polyisoprenes having a high cis-1,4 linkage content and a process for their preparation. The synthetic polyisoprenes according to the invention have a...
6933354 Aluminoboronate activators for single-site olefin polymerization catalysts  
Single-site catalyst systems useful for polymerizing olefins are disclosed. The catalyst systems comprise an organometallic complex and an activator. The complex includes a Group 3-10 transition...
6908972 Method for making polyolefins  
A method for making ethylene polymers and copolymers is disclosed. The method uses a catalyst system comprising a low level of an aluminum-containing activator, a bridged indenoindolyl transition...
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...
6887956 Catalyst system for high-cis polybutadiene  
A catalyst system suitable for use in the production of high cis polybutadiene is disclosed. The catalyst system includes a cobalt salt of the formulaCoAx?, where A is a monovalent or divalent...
6870017 Transition metal compound, catalyst for addition polymerization, and process for producing addition polymer  
A catalyst for addition polymerization obtained by bringing the following (A) into contact with (B) a specific organic aluminum compound and/or aluminoxane, and (C) a specific boron compound, and a...
6867276 Vinylaromatic polymers having high melt flow  
A process for preparing syndiotactic polymers of vinylaromatic monomers having improved melt flowability comprising contacting one or more vinylaromatic monomers with a catalyst system comprising a...
6858686 Process for obtaining a polyisoprene with a high cis-1,4 linkage content  
The present invention relates to a process for obtaining a polyisoprene having a high cis-1,4 linkage content, from a steam-cracked C5 naphtha fraction enriched with isoprene. The process of the...
6838534 Catalytic system and process for the preparation of elastomers by means of this system  
The present invention provides a catalytic system that can be used to prepare by polymerization diene elastomers comprising polyisoprenes and polybutadienes. The invention also provides a process...
6825294 Catalysts for polymerizing styrene and other monomer and process for producing styrene polymer  
Provided are catalysts for styrene polymerization capable of efficiently and inexpensively producing styrenic polymers having a syndiotactic structure; and a method for producing styrenic polymers....
6803430 Polymerization process for improved reactor performance of metallocenes  
The present invention relates to a process for polymerizing olefin(s) in the presence of metallocene-type catalyst compound, an activator and an inorganic oxide support, a Group 13 containing...
6790917 Process for producing vinyl compound polymer  
A process for producing a polymer, which comprises polymerizing a vinyl compound (I) represented by the general formula CH2═CH—R, wherein steric parameters Es and B1 of the substituent R are res...
6787617 Process for producing olefin living polymer  
A process for preparing olefinic living polymers having a molecular weight distribution (Mw/Mn) of 1 to 1.3, comprising polymerizing an olefinic monomer having 2 to 20 carbon atoms at low...
6777509 Solution polymerization process  
A solution polymerization process using a phosphinimine catalyst and a boron activator is conducted at a temperature of about 170° C. or greater in the presence of trialkyl aluminum to produce ...
6774194 Supported catalysts for the polymerization of olefins  
Supported catalysts for the polymerization of olefins comprise the following components: (A) a porous organic support functionalised with groups having active hydrogen atoms;(B) an organo-metallic...
6765074 Olefin polymerization process  
An olefin polymerization process is disclosed. The process comprises polymerizing olefins in the presence of a supported indenoindolyl catalyst system and an organoboron or organoaluminum-treated...
6762255 Prealkylated olefin polymerization catalysts and olefin polymerization employing such catalysts  
Prealkylation of a supported catalyst system comprising a transition metal or inner transition metal complex precatalyst and a bulky, non-coordinating anion on an inorganic support by treatment...
6730755 Halosulfonic acid treated catalyst support for olefin polymerization  
A supported catalyst for olefin polymerization comprises a combination of a novel metal oxide support and an activator which is an aluminoxane or a boron activator. The novel metal oxide support of...
6720394 Supported olefin polymerization catalyst composition  
Alumoxanes having C2-C12 alkyl groups can conveniently be used in supported olefin polymerization catalyst compositions prepared by contacting, either previous to or immediately before the...
6716940 Catalyst for the polymerization of olefins  
Catalyst system for the polymerization of olefins CH2═CHR, wherein R is hydrogen or a hydrocarbon radical having 1-12 carbon atoms, comprising the product of the reaction between (a) a solid c...
Matches 1 - 50 out of 393 1 2 3 4 5 6 7 8 >