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6815516 Copolymer formed by ring-opening polymerization, product of hydrogenation of copolymer formed by ring-opening polymerization, and process for producing these  
A ring-opened metathesis copolymer formed by the ring-opening metathesis copolymerization of a cycloolefin monomer having a carboxylic anhydride group selected from bicycloheptene derivatives,...
6812306 Metallic compounds and the use thereof in the polymerization of olefins  
Metal compounds of the formula I, where M is selected from among Ni and Pd in the oxidation state +II can be used for the polymerization or copolymerization of olefins. Supported catalysts for...
6812305 Method for the production of a catalyst system for the polymerization of olefins  
A catalyst system for the polymerization of olefins is prepared by initially charging one or more compounds of the formula I a or I b, subsequently adding a molecularly defined activator of the...
6812185 Preparation of a metal-containing supported catalyst or a supported catalyst component by impregnation of a support material  
In a process for preparing a metal-containing supported catalyst or a metal-containing supported catalyst component by impregnation of a support material with an impregnation solution comprising...
6806329 Highly alternating ethylene styrene interpolymers  
Novel ethylene styrene interpolymers having atactic ES repeating units and an alternating structure substantially higher than that predicted using Bernoullian statistics may be prepared in the...
6806326 Constrained geometry addition polymerization catalysts  
Metal complexes having constrained geometry and a process for preparation thereof, addition polymerization catalysts formed therefrom, processes for preparation of such addition polymerization...
6806327 Substituted polycyclic, fused ring compounds, metal complexes and polymerization process  
Metal complexes comprising a polycyclic, fused ring ligand or inertly substituted derivative thereof comprising at least: (1) a cyclopentadienyl ring, (2) a 7 membered polyatomic ring, and (3) one...
6803433 Catalyst for olefin polymerization and method for preparing polyolefins  
The present invention relates to a catalyst for preparing polyolefin and olefin polymerization using the same, particularly to a method for preparing polyolefin using a compound obtained by...
6803431 Method for the polymerization of olefins  
The polymerization of olefins is carried out in the presence of catalysts comprising at least one complex of a transition metal with a tridentate macrocyclic ligand which additionally bears at...
6803429 Selective ring-opening cross-metathesis of cycloolefins  
A catalytic method is provided for a ring-opening cross-metathesis reaction between a cycloolefinic substrate and a second olefinic reactant, wherein the catalyst used is a transition metal...
6800774 Catalysts used for olefine polymerization and the preparation thereof  
The present invention provides a polynuclear α-diimine Ni(II) complex used as the precursor of the catalyst in polymerizing polyolefine, represented by the following formula: wherein M is Ni; X...
6800702 OLEFIN TRIMERISATION USING A CATALYST COMPRISING A SOURCE OF CHROMIUM, MOLYBDENUM OR TUNGSTEN AND A LIGAND CONTAINING AT LEAST ONE PHOSPHOROUS, ARSENIC OR ANTIMONY ATOM BOUND TO AT LEAST ONE (HETERO)HYDROCARBYL GROUP  
A process for the trimerisation of olefins is disclosed, comprising contacting a monomeric olefin or mixture of olefins under trimerisation conditions with a catalyst which comprises (a) a source...
6797792 Low carbon monoxide process for nickel catalyzed olefin polymerization  
The use of olefin feedstocks with low carbon monoxide content to achieve improved productivities in nickel catalyzed olefin polymerizations is described.
6797664 Sulphured-metallic coordinated complexes in polyadditive catalysis  
A catalyst system and a method for preparing polymers using the catalyst system is provided. The catalyst system includes a complex represented by the formula: [ML y (HSR) ñ ] n , wherein M is a...
6790918 Transition metal catalysts containing bidentate ligands and method of using and preparing same  
Disclosed is a novel bidentate pyridine transition metal catalyst having the general formula each R is independently selected from hydrogen or C 1 to C 6 alkyl, or C 6 to C 14 aryl, each...
6780947 Metal complexes comprising a 2,6-diacylpyridine-ligand and their use in the polymerization of ethylene  
Organometallic complex having the formula (IAP)M(X) n which can be used for die formation of catalytic systems wherein: M is a metal selected from transition metals and lanthanides, in oxidation...
6780949 Olefin polymerization process  
Olefin polymerizations employing a complex of a Group 8, 9, or 10 transition metal with a bidentate ligand as part of the polymerization catalyst system are improved by adding to the polymerization...
6777510 Internal Lewis acid single site catalyst family for polymerization of polar monomers  
Rational combinatorial computational methods use accurate quantum mechanical and molecular modeling techniques to identify optimum polymerization catalysts for polar olefins. Using mechanistic...
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...
6774195 Catalyst composition and process for preparing norbornene-type homopolymers or copolymers  
A catalyst composition and process for preparing norbornene-type homopolymers or copolymers. The norbornene-type homopolymers or copolymers can be prepared using an in-situ catalyst composition...
6770771 Polymerization of olefins  
Various olefins may be polymerized using a catalyst systems containing selected α-diimine, urethane or urea ligands, some of them novel, complexed to nickel, palladium or other selected transition...
6767856 Transition metal olefin polymerization catalyst having cyclopropenyl derived ligands  
This invention is directed to cationic polymerization of olefins using catalysts comprising a Group 6 or 10 neutral transition metal cation composition having a cyclopropenyl ring, a pi-bonded...
6767975 Olefin polymerization with pyridine moiety-containing singe-site catalysts  
An olefin polymerization process is disclosed. The polymerization is performed in the presence of a clay, an activator, and a transition metal complex that has at least one pyridine...
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...
6762258 Metal complexes as catalyst component for olefin polymerization  
Novel nitrogen containing transition metal complexes have general formula (I): wherein M is Fe[II], Fe[III], Ni[II], Co[I], Co[II], Co[III], V[III], Mn[I], Mn[II], Mn[III], Mn[IV], Ru[II], Ru[III]...
6756505 Metallocene complexes  
In metallocene complexes of a metal of transition group IV, V or VI of the Periodic Table, at least one substituted or unsubstituted cyclopentadienyl radical is bound to an element of group III of...
6756455 High-temperature solution process for polyolefin manufacture  
A high-temperature solution process for making polyolefins is disclosed. Olefins polymerize at greater than about 130° C. in the presence of an activator and an organometallic complex. The complex...
6747105 Bis-Schiff base ligand-containing mono-metallocene olefin polymerization catalyst, its preparation process and application  
A catalyst for olefin polymerization having the following structural formula (I): wherein R 1 is selected from the group consisting of hydrogen, C 1 -C 12 alkyl, C 1 -C 12 alkoxy, or C 6 -C...
6743873 Olefin polymerization catalyst composition and preparation thereof  
A catalyst composition useful for catalyzing the polymerization of olefinic monomers is disclosed, along with a polymerization method using those catalyst compositions to prepare a variety of...
6740724 Ethylene styrene copolymer with isolated styrene  
An ethylene styrene copolymer having isolated styrene monomer units separated by 5 or 6 methylene groups as determined by 13 C-NMR may be polymerized in the presence of an activator and a...
6737487 Polyolefin block copolymers  
A block copolymer of an α-olefin and a second olefin is disclosed. The block copolymers are not highly isotactic, but contain isotactic sequences and have a narrow molecular weight distribution. A...
6734270 Polypropylene-based calendered article and injection-molded article  
A polypropylene-based calendered or injection-molded article satisfying the requirements of (1) having a tensile modulus TM of 5 MPa or higher and (2) having, when measured by a differential...
6730756 Catalyst and process for olefin polymerization  
Olefin polymerization may be catalysed by a wide range of catalytic materials. Described herein is a heterogeneous olefin polymerization catalyst comprising a porous paniculate support material...
6730754 Process for producing substantially amorphous propylene-based polymers  
A process for producing substantially amorphous propylene (co)polymers, comprising contacting propylene optionally in the presence of one or more olefins under polymerization conditions with a...
6730757 Sulfur-containing and sulfur-nitrogen-containing catalysts for polymerization of olefins and polar monomers  
The inventions disclosed herein are catalyst systems comprising a complex having one of the formulas LMX 1 X 2 and LML′ and an activating cocatalyst, and use of the catalyst system in...
6727331 Preparation of polyethylene  
A polyethylene having improved rheological properties is disclosed. The polyethylene has a melt index (MI 2 ) from about 0.01 dg/min to about 50 dg/min and a melt strength (η) that satisfies MI 2...
6723807 Catalyst component and catalyst for addition polymerization, and process for producing addition polymer  
A catalyst obtained by contacting a transition metal compound (A) of the general formula [1]: [L p X o Cp j M(N 2 ) n M′X m L l ]X′ k [1], wherein M and M′ independently represent a...
6723808 Catalyst system and its use in a polymerization process  
Disclosed are polymerization catalyst activator compositions which include a carbonium cation and an aluminum containing anion. These activator compositions are prepared by combining a carbonium or...
6723675 Catalyst for the production of olefin polymers  
A catalyst composition for the polymerization of olefins is provided which comprises a catalyst compound and a co-catalyst or a support material or both a co-catalyst and a support material,...
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...
6703459 Polymerization catalysts for unsaturated monomers, novel transition metal compounds, polymerization processes using same, and copolymers  
This invention relates to polymerization catalysts for unsaturated monomers which are represented by the following general formula [1]: MR 1 k R 2 m R 3 n Q h [1] wherein R 1 is selected from...
6699813 Lanthanide-based catalyst composition for the manufacture of polydienes  
A catalyst composition that is the combination of or the reaction product of ingredients comprising (a) an lanthanide compound, (b) an alkylating agent, (c) a nickel-containing compound, and...
6693154 Transition metal catalysts for olefin polymerization  
A catalyst system useful for polymerizing olefins is disclosed. It comprises an activator and an organometallic complex. The complex includes a Group 3-10 transition or lanthanide metal and a...
6689848 Late transition metal polymerization catalysts  
A single-site olefin polymerization catalyst is described. The catalyst comprises an activator and an inorganic compound comprising iron and a tridentate N-(2-ethylamino)-2-pyridylmethanimino or...
6689829 Process for imparting improved whiteness to polyolefin resins  
Hydroxyalkylamines can, in addition to imparting antistatic properties, significantly improve the color, i.e., the whiteness, of polyolefin resins produced with chromium-based catalysts and...
6686306 Supported dual transition metal catalyst systems  
A coordination catalyst system comprising at least one metallocene or constrained geometry pre-catalyst transition metal compound, (e.g., rac-ethylene bis(indenyl)zirconium dichloride), at least...
6683141 Polymerization catalysts  
A complex suitable for the polymerization of l-olefins is disclosed, having the Formula A wherein M is a transition metal, lanthanide or actinide; X represents an atom or group covalently or...
6683150 High molecular weight polypropylene process  
A propylene polymerization process is disclosed. The process uses a fluorenyl-indenoindolyl catalyst precursor in the presence of an activator to obtain high molecular weight polypropylene with low...
6677267 Polymerization catalysts  
The present invention relates to a process for the polymerization and copolymerization of 1-olefins and to a catalyst to be used in said process wherein the catalyst comprises (1) a complex having...
6673881 Process for the preparation of low molecular weight hydrogenated nitrile rubber  
A hydrogenated nitrile rubber having lower molecular weights and narrower molecular weight distributions than those known in the art can be prepared by the olefin metathesis of nitrile butadiene...
Matches 251 - 300 out of 669 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >