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7973115 |
Catalyst systems based on macrocyclic ligands
The present invention discloses the use of rotoxane ligands to prepare catalyst systems suitable for the oligomerization or polymerization of ethylene and alpha-olefins.
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7902308 |
Polymerisation catalysts
A complex compound comprising the skeletal unit of Formula A, wherein the ring represented by C(R1)-A1-A2-(A3)x-C(R2)—C— has delocalised unsaturation and is optionally substituted via one or mor...
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7838591 |
Process for producing vulcanized molded article of rubber composition, and vibration-proof material
A process for producing a vulcanized molded article of a rubber composition, which comprises the steps of (1) kneading, at least, 100 parts by weight of a defined ethylene-α-olefin-non-conjugated ...
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7776980 |
Monocyclopentadienyl complexes
Monocyclopentadienyl complexes in which the cyclopentadienyl system bears at least one bridged keto, thioketo, imino or phosphino group, a catalyst system comprising at least one of the...
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7541412 |
Process for preparation of polyolefins via degenerative transfer polymerization
Disclosed is a method of producing a polyolefin composition comprising contacting a metallocene pre-catalyst with a substoichiometric amount of a co-catalyst; adding a first olefin monomer; and...
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7514386 |
Chlorinated promoters for vanadium-based polymerization catalysts
Promoters are described for vanadium-based catalysts used in the (co)polymerization of olefins and, in particular, in the production of ethylene/propylene (EPR) or ethylene/propylene/diene (EPDM)...
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7262258 |
Process for producing copolymer
There are provided (I) a process for producing a copolymer of ethylene, an α-olefin having from 3 to 20 carbon atoms and optionally a polyene, which comprises the step of copolymerizing those ...
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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...
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7074868 |
Random butadiene-isoprene copolymers with a trans-1, 4 structure
A description follows of random butadiene-isoprene copolymers with a trans-1,4 structure, having a butadiene/isoprene molar composition ranging from 98/2 to 32/68, the above copolymers being...
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6797794 |
Olefins produced from pre-polymerized catalyst component catalysts
Olefin polymers produced using components of catalysts obtained by contacting a Ti compound of formula Ti(OR)n-yXy, where n is the valence of titanium and y is a number between 1 and n, with a...
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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]: [LpXoCpjM(N2)nM′XmLl]X′k [1], wherein M and M′ independently represent a transition metal of Group...
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6677266 |
Process for preparing a vanadium/titanium catalyst and use in olefin polymerization
There are described a process for preparing catalyst components comprising vanadium, titanium, electron donor and magnesium chloride, supported or unsupported; catalyst systems incorporating the...
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6566465 |
Method for polymerizing conjugated diolefins (dienes) with catalysts based on vanadium compounds in the presence of vinylaromatic solvents
Conjugated diolefins, optionally in combination with other unsaturated compounds which may be copolymerized with the diolefins, are polymerized by performing the polymerization of the diolefins in...
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6562921 |
Catalyst precursor compound and olefin polymerization process using same
A catalyst precursor compound useful for the polymerization of olefins. The compound comprises a metal atom and two π-bonded aromatic ring systems which are bridged by being linked to adjacent ...
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6559089 |
Metallocene catalyst component for use in producing isotactic polyolefins
Provided is a metallocene catalyst component for use if preparing isotactic polyolefins, which component has the general formula (I): R″ (CpR1R2R3)(Cp′R′n) MQ2 wherein Cp is a substituted cyclo...
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6525150 |
Olefin polymerization catalysts and olefin polymer production methods using said olefin polymerization catalysts
Olefins are homopolymerized or copolymerized in the presence of a catalyst containing a reaction product obtained from vanadium oxytrichloride and 2,2′-thiobis(6-t-butyl-4-methylphenyl), an o...
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6518379 |
Method of producing rubber compositions in styrene solutions with sterically superior chelate catalysts
In a process for polymerizing dienes in a solvent comprising vinylaromatic monomers, the polymerization is carried out in the presence of a metal compound of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo or W as...
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6495641 |
Catalysts based on vanadium, their preparation and use in the (CO) polymerization of α-olefins
Vanadium complex having general formula (I) (RCOO)nVXpLm (I)wherein R is a monofunctional hydrocarbon radical having from 1 to 20 carbon atoms and from 1 to 6 halogen atoms, selected from chlorine...
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6489261 |
Catalyst composition comprising a reduced transition metal complex and a cocatalyst
Catalyst compositions include a reduced transition metal complex of structure (I) and a cocatalyst. where, L1 and L2, may be the same or different, are anionic ligands, other than cyclopentadienyl...
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6462153 |
Method of polymerizing vinyl chloride monomer
Disclosed is a catalyst composition and a method of polymerizing vinyl chloride using it. The catalyst composition is a mixture of a vanadyl (V) catalyst having the formula and about 0.5 to about...
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6455649 |
Catalyst for producing living olefin polymer and process for producing the polymer
A catalyst comprising an organoaluminum compound and a vanadium chelate compound having the lability to cause olefins to undergo living coordination polymerization is contacted with a terminal...
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6451726 |
Pre-polymerized catalyst components for the polymerization of olefins
Components of catalysts for the polymerization of olefins are obtained by contacting a Ti compound of formula Ti(OR)n−yXy, where n is the valence of titanium and y is a number between 1 and n, w...
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6403739 |
Supported catalytic system for the production of ethylene propylene copolymers
Catalytic component for the polymerization of ethylene with propylene prepared by: a) impregnation of an inert support with a solution of a compound of Vanadium having an oxidation state of between...
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6388032 |
Cyclic olefin polymer containing little catalyst residue
A cyclic olefin polymer having a small content of a catalyst residue, a production process for the same and use of the same as an optical material. Catalysts used for polymerization and/or...
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6384162 |
Process for production of olefin polymer with long chain branching
A process for production of an ethylene-propylene-diene-methylene (EPDM) tetrapolymer having long chain branching is described. The process comprises the step of polymerizing a monomer mixture...
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6362294 |
Reduced oxidation state transition metal compounds useful as olefin polymerization catalysts
This invention is directed to reduced oxidation state Group 4-6 metal compounds, preferably the first row metals in those groups, suitable for activation as polymerization catalysts and...
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6232416 |
Olefin polymerization comprising group 5 transition metal compounds in their highest metal oxidation state
The invention addresses Group 5 metal compounds suitable as polymerization catalysts characterized by comprising one Group 15 element polyanionic ancillary ligand and three single or multidentate...
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6228960 |
Process for the preparation of ethylene propylene copolymers with a low content of residual chlorine
Process for the preparation of EP(D)M elastomeric copolymers in liquid phase, preferably in suspension of a liquid monomer, in the presence of a catalyst essentially consisting of a Vanadium...
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6221983 |
Dispersion polymerization in the presence of metallocene catalyst
The present invention is a process of preparing copolymers of vinyl aromatic and olefinic monomers wherein the polymerization is carried out in a dispersion in the presence of a metallocene...
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6214951 |
Cycloolefin copolymers having high tear strength and low optical attenuation
Thermoplastic cycloolefin copolymers (COCs) having high tear strength and low optical attenuation, a process for their preparation, and their use as optical waveguides (optical fibers).
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6153807 |
Process for producing ethylene/alpha-olefin copolymer
A copolymer of ethylene and an alpha-olefin having an ethylene content of from 30 to 90 mole %, a number average molecular weight of from 300 to 30,000 and a molecular weight distribution defined...
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6150483 |
Catalyst system for the preparation of a rubbery copolymer
The invention relates to a catalyst system and a process suited for the preparation of a rubbery copolymer of ethylene, one or more α-olefins and optionally one or more polyunsaturated compounds, ...
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6140441 |
Ethylenic random copolymer, process for preparing the same, and rubber composition
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6013745 |
Phosphorus based catalysts for the polymerization of olefins
The present invention relates to the polymerization of one or more alpha olefins in the presence of a transition metal catalyst having either a heterobifunctional ligand, having a phosphorus and a...
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RE36406 |
Process for producing cycloolefin random copolymer
A process for producing a cycloolefin random copolymer, which comprises (1) copolymerizing (a) ethylene or both ethylene and an alpha-olefin having at least 3 carbon atoms with (b) a cycloolefin...
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5851946 |
Coordination catalyst systems comprising intramolecularly stabilized organometallic compounds
The invention relates to the use of intramolecularly stabilized organometallic compounds as components in coordination catalyst systems, corresponding coordination catalyst systems and processes...
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5783645 |
Non-sticky prepolymerized catalyst, and use thereof in production of non-sticky resin
A colorable resin particle having an outer shell of a non-sticky polymer and an inner core of a sticky polymer produced in a gas phase fluidized bed reactor at or above the sticking temperature of...
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5780570 |
Process for the preparation of polymeric mixtures based on EP (D) M elastomer copolymers
Process with two or more steps for the preparation in suspension of mixtures of ethylene-propylene (EPM) elastomer homopolymers or ethylene-propylene-diene (EPDM) elastomer terpolymers in the...
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5773539 |
Catalytic component based on vanadium and its use in the preparation of EP(D)M
Catalytic component for the (co)polymerization of alpha-olefins consisting of the compound having the general formula VL3, wherein V is trivalent vanadium and L is a ligand selected from those...
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5739225 |
Process for preparing olefin polymer, and ethylenic polymer
An olefin polymer is prepared by homopolymerizing an olefin or copolymerizing two different olefins or an olefin and another polymerizable unsaturated compound in the presence of a polymerization...
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5646224 |
Rubber composition
A rubber composition excellent in shape-retainability also in processibility, compression set and the like, which comprises a single ethylene-α-olefin-non-conjugated diene copolymer which has (1) ...
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5646220 |
Cycloolefin block copolymers and a process for their preparation
Cycloolefin block copolymers, which in particular are suitable as phase promoters, are preferably obtained by copolymerization of polycyclic olefins, such as norbornene, with acyclic olefins, such...
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5508363 |
Preparation process of organosilicon compounds and production of silicon carbide
Disclosed herein are a novel process for the preparation of alkylsilanes and alkenyl silanes by hydrosilylation of their corresponding silanes and unsaturated hydrocarbons in the presence or...
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5502127 |
Process for production of homogeneous polyethylene
A process for the production of a homogeneous polyethylene comprising contacting a mixture comprising ethylene, one or more alpha-olefins, and one or more unconjugated dienes, under polymerization...
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5492986 |
Process for producing homogeneous polyethylenes
A process for the production of a homogeneous polyethylene comprising contacting a mixture comprising ethylene, one or more alpha-olefins, and one or more unconjugated dienes, under polymerization...
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5475061 |
Process for producing styrenic copolymer
There are disclosed a styrenic copolymer which comprises at least one structural unit represented by the general formula (I) ##STR1## and a structural unit represented by the general formula (II)...
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5371158 |
Bulk polymerization using specific metallocene catalysts for the preparation of cycloolefin polymers
Bulk polymerization using specific metallocene catalysts for the preparation of cycloolefin polymersPolymers of polycyclic olefins, such as, for example, norbornene or tetracyclododecene, or...
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5367037 |
Process for producing ethylene/propylene/ethylidene norbornene rubbers
A process for the production of EPDM comprising reacting ethylene, propylene, ethylidene norbornene, and hydrogen, in the gas phase, in a fluidized bed, under polymerization conditions, in the...
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5334678 |
Both ends-modified olefin polymers and processes for the production thereof
Polymers of olefins such as ethylene and propylene, having functional groups introduced into both the ends thereof, can be provided which are useful as macromonomers for polycondensation. This new...
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5328956 |
Propylene (co)polymer and process for the preparation of the same
A propylene (co) polymer terminated with a reactive group and a process for the preparation of the same.A graft copolymer having a specific side chain and a process for the preparation of the...
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