|
Match
|
Document |
Document Title |
|
|
7601787 |
Ethylene polymerization process
A process for polymerizing ethylene is disclosed. The polymerization is performed in the presence of a Ziegler-Natta catalyst system in two slurry reaction zones. Most of the polyethylene (70-95...
|
|
|
7589162 |
Polyethylene compositions and pipe made from same
A polymer composition comprising a density equal to or greater than about 0.947 g/cc, a high load melt index from about 1 g/10 min to about 30 g/10 min, and a tensile natural draw ratio less than...
|
|
|
7531602 |
Polymer blends
A blend of polymers comprising from 5 to 95 weight % of a polymer having a high molecular weight made using a single site type catalyst and from 95 to 5 weight % of a polymer having a lower...
|
|
|
7459509 |
Polyethylene resins
The invention provides ethylene/α-olefin copolymers exhibiting improved environmental stress cracking resistance properties, and methods for the production of the copolymers in a single reactor by...
|
|
|
7452946 |
Ethylene polymer
An ethylene-based polymer which is a copolymer obtained from ethylene and a C3 to C10α-olefin and satisfies the following requirements (i), (ii), (iii) and (iv) simultaneously provides a...
|
|
|
7449527 |
Polyolefin production
Provided is a process for producing a polyolefin having a multimodal molecular weight distribution, which process comprises: (a) polymerizing a first olefin monomer in the presence of an...
|
|
|
7442750 |
Supported olefin polymerization catalyst
Supported catalyst systems are provided comprising (a) a transition metal compound, (b) an activator comprising (iii) an aluminoxane or (iv) a Group lilA metal or metalloid compound, and (c) a...
|
|
|
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...
|
|
|
7410926 |
Polymerization process using a supported, treated catalyst system
The present invention relates to a supported, treated catalyst system and its use in a process for polymerizing olefin(s). More particularly, it provides a supported, treated catalyst system...
|
|
|
7396888 |
Catalyst system comprising a mixture of catalyst components for producing a polyolefin blend
Provided is a catalyst system for producing a polyolefin blend, which catalyst system comprises a mixture including the following catalyst components: i) a catalyst component A capable of producing...
|
|
|
7365137 |
Multistep process for the (co) polymerization of olefins
A multistep process for the polymerization of one or more olefins comprising a first step of polymerizing one or more of said olefins in the presence of a catalyst of the Ziegler-Natta type, a step...
|
|
|
7321015 |
Adjusting polymer characteristics through process control
Properties of a polymer produced using a dual catalyst on the same support, such as polydispersity and comonomer incorporation, may be controlled by controlling reaction parameters such as...
|
|
|
7304118 |
Polyethylene pipe having better melt processibility and high resistance to stress and method of preparing the same using metallocene catalyst
An ethylene-based copolymer for non-crosslinked water supply pipe is provided. The ethylene-based copolymer is prepared using a supported hybrid metallocene catalyst and has a dimodal or broad...
|
|
|
7259215 |
Process for producing propylene/ethylene block copolymer and propylene/ethylene block copolymer
A process for producing a propylene-ethylene block copolymer in a good morphology using a catalyst system comprising a metallocene catalyst (1) preparing high crystalline polypropylene, a...
|
|
|
7259214 |
Metal catalyst for olefin polymerization and co-polymerization with functional monomers
A catalyst is disclosed for the polymerization and co-polymerization of olefins with functionalized monomers. The catalyst is formed from a combination of two neutral metal complexes, L( i Pr 2...
|
|
|
7238756 |
Polymerization process and control of polymer composition properties
Methods of controlling the flow index and/or molecular weight split of a polymer composition are disclosed. The method of producing a polymer composition in one embodiment comprises incorporating a...
|
|
|
7192902 |
Polymerization process with mixed catalyst compositions
The application describes a mixed olefin polymerization catalyst composition comprising a support, a reaction product of at least one first organometallic compound and a first activator capable of...
|
|
|
7141632 |
Mixed metallocene catalyst systems containing a poor comonomer incorporator and a good comonomer incorporator
The present invention provides polymerization catalyst compounds, catalyst systems including these catalyst compounds, and to their use in the polymerization of ethylene and at least one comonomer....
|
|
|
7132486 |
Linear low density polyethylenes with high melt strength and high melt index ratio
Linear low density polyethylenes (LLDPEs) that have relatively high melt index ratios (MIR) and relatively high melt strength (MS) are described. This combination of melt properties is achieved by...
|
|
|
7119153 |
Dual metallocene catalyst for producing film resins with good machine direction (MD) elmendorf tear strength
This invention relates to catalyst compositions comprising a first metallocene compound, a second metallocene compound, at least one chemically-treated solid oxide, and at least one organoaluminum...
|
|
|
7101939 |
Ethylene/α-olefin copolymer made with a non-single-site/single-site catalyst combination, its preparation and use
An ethylene/α-olefin copolymer comprising a component produced by a non-single-site polymerization catalyst and a component produced by a single-site polymerization catalyst, its preparation and...
|
|
|
7067451 |
Soluble magnesium complexes useful for the production of polyolefin catalysts and catalysts prepared therewith
A method of forming a polyolefin catalyst component includes halogenating metal complexes. The metal complexes result from reacting a metal alkoxide with an alcohol-ether. A particular non-limiting...
|
|
|
7064096 |
Dual catalyst on a single support
Bimodal polyolefins having a reverse or partial reversed comonomer incorporation may be prepared in the presence of a dual catalyst on the same support wherein each catalyst has a different...
|
|
|
7053157 |
Method for production of multimodal polyolefins of tunable composition, molecular weight, and polydispersity
The present invention relates to a method of producing multimodal polyolefins using at least one or more activated metallocene catalysts. The activated metallocene catalysts are used in combination...
|
|
|
7049263 |
Process for producing catalyst for α-olefin polymerization and process for producing α-olefin polymer
There are provided a process for producing a catalyst for α-olefin polymerization, which comprises the step of contacting (1) a solid catalyst component having Ti, Mg and a halogen as essential...
|
|
|
7045478 |
Method of producing a catalyst for ethylene homo-and co-polymerization
The present invention relates to a catalyst for homo-polymerization or co-polymerization of ethylene, or more particularly to a solid complex titanium catalyst for homo-polymerization or...
|
|
|
6995219 |
Olefin polymerization process
The invention relates to a process for the preparation of a multimodal A-olefin polymer comprising polymerizing in a polymerization stage at least one A-olefin in the presence of a multisite...
|
|
|
6982305 |
Olefin polymerization in the presence of a dehydrogenation catalyst
A process for polymerizing olefins is disclosed. The process polymerizes an olefin in the presence of a dehydrogenation catalyst and an olefin polymerization catalyst. The dehydrogenation catalyst...
|
|
|
6982304 |
Blow molding resins with improved ESCR
Polyethylene resins having improved environmental stress crack resistance, stiffness and impact resistance is made by a process comprising feeding both a chromium oxide catalyst and a silyl...
|
|
|
6962889 |
Spherical catalyst for olefin polymerization
Disclosed are catalyst systems and methods of making the catalyst systems/supports for the polymerization of an olefin containing a solid titanium catalyst component having a substantially...
|
|
|
6943134 |
Bimodal polyolefin production process and films therefrom
A process of producing a bimodal polyolefin composition is described, which includes in one embodiment contacting monomers with a supported bimetallic catalyst composition for a time sufficient to...
|
|
|
6921795 |
Manufacture of polyethylenes
Blends of two or more polyethylenes are made by reacting ethylene with an oligomerization catalyst that forms α-olefins, and two polymerization catalysts, one of which under the process conditions...
|
|
|
6906153 |
Dual-site olefin polymerization catalyst composition
The invention provides a catalyst system (preferably a heterogeneous catalyst system) comprising: a transition metal bisphenolate catalyst (preferably a group 4 to 6 transition metal bisphenolate...
|
|
|
6894128 |
Catalyst composition, method of polymerization, and polymer therefrom
Catalyst compositions and methods useful in polymerization processes utilizing at least two metal compounds are disclosed. At least one of the metal compounds is a Group 15 containing metal...
|
|
|
6884747 |
Linear low density polyethylenes with high melt strength and high melt index ratio
Linear low density polyethylenes (LLDPEs) that have relatively high melt index ratios (MIR) and relatively high melt strength (MS) are described. This combination of melt properties is achieved by...
|
|
|
6861485 |
Multi-catalyst system for olefin polymerization
A multi-catalyst system is disclosed. The catalyst system comprises catalyst A and catalyst B. Catalyst A comprises a supported bridged indenoindolyl transition metal complex. Catalyst B comprises...
|
|
|
6855654 |
Bimetallic catalyst for ethylene polymerization reactions with uniform component distribution
The invention relates to a process for uniformly dispersing a transition metal metallocene complex on a carrier comprising
(1) providing silica which is porous and has a particle size of 1 to 250...
|
|
|
6852810 |
Molecular blended polymer and process for preparing the same
The present invention provides a molecular blended polymer that includes two or more types of polymers blended at the molecular level. At least one monomer is polymerized in the presence of two or...
|
|
|
6800700 |
Polymerizations using adjuvant catalysts
Disclosed herein are methods for producing polymeric materials which are normally tenacious in their character to such degree that their processing by conventional means is not possible, for...
|
|
|
6784263 |
Catalyst compositions for polymerizing olefins to multimodal molecular weight distribution polymer, processes for production and use of the catalyst
A solid catalyst component comprises a transition metal-containing metallocene compound, a non-cyclopentadienyl transition metal compound, a magnesium compound and a polymeric material which acts...
|
|
|
6753390 |
Gas phase polymerization process
A gas phase polymerization process for producing a polyolefin composition is described, which includes passing a gaseous stream containing hydrogen gas and one or more monomers, including ethylene...
|
|
|
6632896 |
Ethylene polymerization
Ths invention provides a process for the preparation of a polyethylene, in particular an HDPE suitable for blow moulding of HIC, which comprises polymerizing ethylene and, optionally an...
|
|
|
6627710 |
Catalyst components for the polymerization of olefins and catalysts therefrom obtained
The invention relates to catalyst components, suitable for the preparation of homopolymers and copolymers of ethylene having a broad molecular weight distribution (MWD), which comprise Ti, Mg, Cl,...
|
|
|
6620896 |
Mixed olefin polymerization catalysts, processes employing such catalysts, and polymers obtained therefrom
Mixed olefin polymerization catalysts, methods for preparing olefin polymers using the catalysts, and polymers obtained therefrom are disclosed. The mixed catalyst system comprises the combination...
|
|
|
6620895 |
Processing polyethylenes
Polyethylenes made from ethylene and a series of α-olefins using a catalyst that copolymerizes ethylene and α-olefins usually have excellent melt processing characteristics, especially in uses...
|
|
|
6610800 |
Process for preparing in a single reactor polymer blends having a broad molecular weight distribution
Ethylene-based polymer blends having an MWD of at least about 2 are made in a single reactor using a mixed constrained geometry catalyst (CGC) system. The process comprises the steps of contacting...
|
|
|
6593442 |
Semicrystalline propylene polymer compositions with good suitability for producing biaxially oriented films
A semicrystalline propylene polymer composition with good suitability for producing biaxially oriented films and prepared by polymerizing propylene, ethylene and/or C 4 -C 18 -1-alkenes, where at...
|
|
|
6579962 |
Biaxially-oriented metallocene-based polypropylene films
A process for the production of biaxially-oriented polypropylene film involving the provision of a polypropylene polymer produced by the polymerization of propylene in the presence of a metallocene...
|
|
|
6573343 |
Multistep process for preparing polyolefins having high melt strength
Olefin polymers are prepared in a plurality of polymerization stages, optionally in a plurality of polymerization reactors, in the presence of hydrogen and an olefin polymerization multisite...
|
|
|
6569963 |
Process for controlling the MWD of a broad or bimodal resin in a single reactor
A process for controlling the MWD of a broad or bimodal resin in a single fluid bed reactor using a mixed catalyst composition containing a bimetallic catalyst and a make-up catalyst of at least...
|