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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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7473746 |
LTMC polymerization of unsaturated monomers
A process for polymerizing unsaturated monomers is disclosed. The process comprises polymerizing, in the presence of a late transition metal catalyst (LTMC), a variety of unsaturated monomers which...
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7470756 |
Propylene random copolymer and process for the production thereof
The present invention relates to a process for preparing a propylene random copolymer comprising polymerisation of propylene with a comonomer, said comonomer being ethylene or an α-olefin...
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7256150 |
Preparation of olefin polymerization catalyst component
A process for producing a Gp 2/transition metal olefin polymerisation catalyst component, in which a Gp 2 complex is reacted with a transition metal compound so as to produce an oil-in-oil...
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7153915 |
Precision fragmentation assemblages and olefin polymerization catalysts made therefrom
A precision fragmentation assemblage is disclosed, along with precision fragmentation assemblage catalysts derivable therefrom. A method for the preparation of a precision fragmentation assemblage...
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7141636 |
Method for producing a polymer
The present invention relates to a process for preparing a catalyst, a novel polymer and a process for preparing the polymer. In particular, the invention provides a process for preparing a...
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7015290 |
Method of preparing a polymer under predetermined temperature conditions, and apparatus therefor
A method of preparing a polymer under predetermined temperature conditions comprises conducting the polymerization within a closed reaction chamber configured such that most or all of an inner...
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6984599 |
Olefin polymerization catalysts based on hydroxyl-depleted calixarene ligands
A catalyst system useful for polymerizing olefins is disclosed. The catalyst system includes an organometallic complex that incorporates a Group 3 to 10 transition metal and a hydroxyl-depleted...
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6949613 |
Polymerization initiator and use
The application discloses supported initiators for transition metal mediated living free radical and/or atom transfer polymerisation comprising an initiator moiety attached to a support via a...
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6919414 |
Copolymers and films thereof
Novel copolymers comprise ethylene and alpha olefins having from 3 to 10 carbon atoms and which have
(a) a density in the range 0.900 to 0.940 (b) Mw/Mn of 2-3.4 (c) I 21 /I 2 from 16 to 24...
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6906150 |
Heat exchanger polymerization reactors for manufacturing drag reducing agents
Temperature control and efficient heat transfer are important to producing high quality polymer drag reducing agents from alpha-olefin and/or other monomers. Many polymerization reactions are...
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6844290 |
Oligomerization catalyst
An oligomerization catalyst for olefins is obtainable from
a) a chromium compound CrX 3 and the at least equimolar amount, based on the chromium compound CrX 3 , of a ligand L or from an existing...
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6784261 |
Imidochromium compounds contained in catalyst systems for olefin polymerization
The present invention relates to catalyst system containing at least one imidochrome compound and at least one activation compound. This invention also relates to imidochrome compounds, to a method...
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6730744 |
Method for copolymerization and resulting copolymers
The invention concerns a method for preparing block copolymers comprising steps which consist in: polymerising a first monomer using an organolanthanide catalyst wherein said catalyst in the form...
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6713572 |
Ethylene copolymerization process
A process as disclosed for producing a low density polyethylene using a particle form polymerization process and a titanium-containing catalyst wherein the ratio of comonomer to ethylene is at...
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6642339 |
Low density copolymers of ethylene and alpha-olefins
Copolymers of ethylene and alpha olefins having from 3 to 10 carbon atoms and which have (a) a density in the range 0.900 to 0.940 (b) an apparent Mw/Mn of 2-3.4 (c) I 21 /I 2 from 16 to 21.5 (d)...
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6617064 |
Stabilized aluminum hydride polymorphs
The present invention features methods for preparing stabilized α-AlH 3 and α′-AlH 3 , compositions containing these alane polymorphs, e.g., energetic compositions such as rocket propellants,...
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6562924 |
Process for the gas-phase (co)-polymerization of olefins in a fluidized bed reactor
A process for the gas-phase (co-)polymerization of olefins in a fluidized bed reactor using a metallocene catalyst in that the polymerization is preformed in the presence of a process aid additive...
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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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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″ (CpR 1 R 2 R 3 )(Cp′R′n) MQ 2 wherein Cp is a...
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H002060 |
Cyclobutyl silanes for catalysts useful for making highly isotactic olefin polymers
One aspect of the present invention relates to a catalyst system for use in olefinic polymerization, containing a solid titanium catalyst component prepared by contacting a titanium compound and a...
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6521560 |
Solid titanium catalyst component, process for preparing same, olefin polymerization catalyst containing same, and olefin polymerization process
This invention provides a solid titanium catalyst component which comprises magnesium, titanium, halogen and an electron donor, is free from elimination of titanium when washed with hexane at room...
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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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6500908 |
Catalyst system
A catalyst system comprises a) a cocatalytically active chemical compound A, b) at least one metallocene B and c) an aluminum compound C.
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6492476 |
Catalyst based on rare earth metal compounds
The present invention comprises a catalyst based on rare earth metal compounds which consists of a rare earth metal compound, an organic aluminum compound and a trihalosilane, of a process for the...
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6492475 |
Ethylene/α-olefin copolymer
The present invention relates to an ethylene-α-olefin copolymer; a composition thereof; a film thereof; a polar group-containing resin material; and productions and use of the ethylene-α-olefin...
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6492465 |
Propylene impact copolymers
This invention relates to propylene impact copolymer compositions. In particular, these unique and improved compositions can be produced using conventional, commercial-scale processes.
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6482906 |
Process for preparing and using neodymium neodecanoate
A new process for the preparation of neodymium neodecanoate, which is utilized as the metallic component, in a new process for the preparation of three-component homogeneous catalytic systems. The...
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6458901 |
Propylenic copolymer and thermoplastic resin composition
A propylene copolymer comprising propylene, at least one olefin selected from the group consisting of olefins having 2 to 20 carbon atoms except propylene, and a cyclic olefin, wherein the total...
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6455660 |
Homopolymer of ethylene
A polyethylene having the following properties: an annealed density D/weight average molecular weight M w relationship defined by the equation D>1104.5M w −0.0116 , and a Charpy Impact I/High...
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6448350 |
Process for the preparation of copolymers of ethylene with alpha-olefins
Ethylene based copolymers having high molecular weights, narrow molecular weight distributions, and a very good homogeneous distribution of the comonomer units can be obtained in high yields at...
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6426396 |
Process for producing poly (cyclic conjugated diene)
Poly(cyclic conjugated diene) polymers are prepared by polymerizing a cyclic conjugated diene monomer or cyclic conjugated diene monomer and a double bond-containing monomer using a transition...
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6413899 |
1-olefin isoblock polymer and process for its manufacture
Isoblock polymers of 1-olefins with a narrow molecular weight distribution are obtained when 1-olefins are polymerized using a catalyst consisting of a chiral metallocene, containing bridges, of...
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6410661 |
Stereorigid metallocene compounds
A stereorigid metallocene compound contains, as ligands, an aryl-substituted cyclopentadienyl radical, linked via a hydrogen bridge, and a substituted or unsubstituted fluorenyl radical. The novel...
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6407185 |
Process for the preparation of a composition containing ethylene polymers, composition containing ethylene polymers and use thereof
Process for the preparation of a composition containing ethylene polymers comprising a polymer of melt index MI 2 of 5 to 1000 g/10 min and a polymer of melt index MI 5 of 0.01 to 2 g/10 min, the...
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6407177 |
Polypropylene blend
Polymer blends of isotactic polypropylene and syndiotactic polypropylene enhance the processability in film applications. Up to a level of 4% by weight of syndiotactic polypropylene will increase...
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6376628 |
Process for polymerization of alpha-olefin and alpha-olefin polymer
A method for preparing an α-olefin polymer comprising the step of polymerizing or copolymerizing an α-olefin in the presence of a catalyst containing a solid catalyst constituent (A) which...
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6376614 |
Ethylene copolymer and aromatic vinyl graft copolymer and method for producing the same
The present invention provides resin materials endowed with excellent heat resistance, solvent resistance, tensile elongation, toughness, and transparency. Specifically, there are provided an...
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6365688 |
Organometallic compound, preparation method thereof and process for polymerization of olefins by means of a catalyst composition including the organometallic compound
The invention relates to an organometallic compound comprising a central transition metal atom and a ligand coordinated thereto having a heteroatomic ring structure, characterized in that the...
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6365687 |
Process for the polymerization and copolymerization of certain unsaturated hydrocarbons
This invention relates to a process for copolymerizing unsaturated hydrocarbons of the formula CH 2 ═CHR in which R is a saturated aliphatic radical with two or more carbon atoms or a...
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6358876 |
Organo-aluminum compounds immobilized on organopolysiloxane microgel particles
The invention relates to particles comprises of organopolysiloxane microgel particles having a diameter of 5 to 200 nm and organo-aluminum compounds immobilized thereon. The particles can be used...
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6350831 |
Process for the polymerization of olefins using a catalyst containing a novel catalyst component
A metallocene compound may be used as a catalyst component for the polymerization of olefins. The compound is stable to air and moisture so that it generates no hydrogen halide by hydrolysis and is...
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6344529 |
Zwitterionic catalyst activator
Disclosed are compounds useful as catalyst activators for olefin polymerization, comprising structures of the following formulae: wherein: L + is a protonated derivative of an element of Group...
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6316562 |
Catalyst systems for (co-)polymerization reactions, metallocene amide halogenides, the production and use thereof
This invention relates to new metallocenes with mixed substituents and enhanced activity, methods of producing metallocene compounds, and the use of metallocenamide halides for generating an active...
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6316553 |
Process for producing polymers using a composition comprising an organometal compound, a treated solid oxide compound, and an organoaluminum compound
A process of using a catalyst composition to polymerize at least one monomer to produce a polymer. The process comprising contacting the catalyst composition, at least one monomer in a...
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6300439 |
Group 15 containing transition metal catalyst compounds, catalyst systems and their use in a polymerization process
The present invention relates to a Group 15 containing metal catalyst compound having a substituted hydrocarbon leaving group, a catalyst system and a supported catalyst system thereof and to a...
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6300438 |
Hafnium transition metal catalyst compounds, catalyst systems and their use in a polymerization process
The present invention relates to a Group 15 containing hafnium catalyst compound, a catalyst system and a supported catalyst system thereof and to a process for polymerizing olefin(s) utilizing them.
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6291614 |
Dinuclear fluoroaryl aluminum alkyl complexes
A catalyst activator particularly adapted for use in the activation of metal complexes of metals of Group 3-10 for polymerization of ethylenically unsaturated polymerizable monomers, especially...
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6281304 |
Preparation of polymers of vinylaromatic compounds under superatmospheric pressure in the presence of volatile hydrocarbons
In a process for preparing polymers of vinylaromatic compounds at from 0 to 150° C. in the presence of metallocene complexes as catalysts, the polymerization is carried out at a pressure of from 5...
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6268448 |
Iminophosphonamide complexes for olefin
The present invention relates to the use of complexes of transition metals having a ligand containing a phosphorus or arsenic atom bound to the transition metal through an oxygen atom, or an amido...
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