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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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,...
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7115693 |
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...
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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 M 1 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...
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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...
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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...
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7056994 |
Catalyst composition
The present invention relates to a catalyst composition for polymerization of a conjugated diene, comprising: (A) a metallocene-type complex represented by a general formula (I): (C 5 R 1 R 2 R 3 R...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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 formula
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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...
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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...
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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...
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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...
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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....
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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...
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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 CH 2 ═CH—R, wherein steric parameters Es and B1 of the substituent R are...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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6716940 |
Catalyst for the polymerization of olefins
Catalyst system for the polymerization of olefins CH 2 ═CHR, wherein R is hydrogen or a hydrocarbon radical having 1-12 carbon atoms, comprising the product of the reaction between (a) a solid...
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6653430 |
Butadiene polymers and process for producing conjugated diene polymers
A butadiene polymer (i) having a cis bond unit content of at least 50% based on the total butadiene units, a number average molecular weight (Mn) of 1,000 to 10,000,000, and at least 80%, based on...
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6639030 |
Process for production of olefin polymer
A process for production of an olefin polymer is provided which comprises polymerization of ethylene and/or α-olefin of three of more carbons at a polymerization temperature of not lower than...
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6617405 |
Process for the preparation of polyethylene
A process of polymerizing ethylene or ethylene and one or more comonomers in one or more fluidized bed reactors with a catalyst system comprising (i) a supported or unsupported magnesium/titanium...
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6605676 |
Process for obtaining polyolefins with broad bimodal or multimodal molecular weight distributions
The process is characterized by the use of catalyst systems consisting of a single metallocene catalyst activated with mixtures of at least 2 co-catalysts. The co-catalysts are aluminium alkyls,...
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6576723 |
Catalyst system and its use for the polymerization of propylene
A catalyst system which can be used in the polymerization of propylene comprises at least one metallocene as a rac/meso isomer mixture, at least one organoboroaluminum compound, at least one...
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6569964 |
Alumoxane-enhanced, supported Ziegler-Natta catalysts, methods of making same, processes of using same and polymers produced therefrom
The invention relates to an improved olefin catalyst, a method of in situ-activated catalyst preparation and a process for the polymerization of olefinic monomers via, for example, a titanium...
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6562918 |
Olefin polymerization catalyst, method for producing the same and method for producing olefinic polymer
A catalyst for olefin polymerization, which is obtained by contacting (A) a compound of a transition metal of Groups 4 to 6 of the Periodic Table, (B) an organoaluminiumoxy compound, and optionally...
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6559252 |
Catalysts and processes for the polymerization of olefins
Catalysts for the polymerization of olefins are disclosed, which comprise the product obtained by contacting: (A) a bridged and/or substituted cyclopentadienyl compound of titanium, zirconium or...
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6555632 |
Process for the preparation of a catalytic system, process for the (CO)polymerization of olefins and (CO)polymers of at least one olefin
Process for the preparation of a catalytic system according to which a mixture of a halogenated neutral metallocene derived from a transition metal chosen from groups IIIB, IVB, VB and VIB of the...
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