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| Number | Title | Issue Date |
| 8106139 | Propylene/alpha-olefin block interpolymers Embodiments of the invention provide a class of mesophase separated propylene/α-olefin block interpolymers with controlled block sequences. The propylene/α-olefin interpolymers are characterized by an average block index, ABI, which is greater than zero and up to ... | 01/31/2012 |
| 7906603 | Polymers having broad molecular weight distributions and methods of making the same Methods of polymerizing at least one olefin include contacting the olefin with a catalyst comprising chromium and with a cocatalyst comprising a non-transition metal cyclopentadienyl (Cp) compound. The polymerization may be performed in the presence of hydrogen. Usi... | 03/15/2011 |
| 7816478 | Polyethylene thick film and process for preparing polyethylene A thick film and process to prepare polyethylene useful for the film are disclosed. Ethylene is polymerized in two reaction zones with a C6-C10 α-olefin in the presence of a catalyst system comprising an activator, a supported bridged zirconiu... | 10/19/2010 |
| 7745557 | Polymers having broad molecular weight distributions and methods of making the same Methods of polymerizing at least one olefin include contacting the olefin with a catalyst comprising chromium and with a cocatalyst comprising a non-transition metal cyclopentadienyl (Cp) compound. The polymerization may be performed in the presence of hydrogen. Usi... | 06/29/2010 |
| 7700708 | Ethylene polymer and application thereof to moldings An ethylene polymer containing 0.01 to 1.20 mol % of a constitutional unit derived from α-olefin having 6 to 10 carbon atoms, wherein with respect to cross fractionation chromatography (CFC), either (1) the weight average molecular weight (Mw) of the components elu... | 04/20/2010 |
| 7595371 | Ethylene-α-olefin copolymer and food packaging material An ethylene-α-olefin copolymer comprising repeating units derived from ethylene and repeating units derived from an α-olefin having 3 to 20 carbon atoms and having a melt flow rate (MFR) of from 0.01 to 100 g/10 min, a density (d) of from 890 to 970 kg/m3 | 09/29/2009 |
| 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 about 14167 ρ-12958, where ρ is the density (g/cc) of the compositio... | 09/15/2009 |
| 7491781 | Propylene polymer catalyst donor component A solid, hydrocarbon-insoluble, catalyst component useful in polymerizing olefins containing magnesium, titanium, and halogen further contains an internal electron donor comprising a compound containing electron donating substituents with a structure: | 02/17/2009 |
| 7482418 | Crystalline propylene-hexene and propylene-octene copolymers Improved thermoplastic polymer blend compositions comprising an isotactic polypropylene component and an alpha-olefin and propylene copolymer component, said copolymer comprising crystallizable alpha-olefin sequences. In a preferred embodiment, improved thermoplasti... | 01/27/2009 |
| 7449534 | Polymerization process for producing propylene copolymers The invention provides a process for the preparation of a propylene polymer in which proplylene and a comonomer copolymerizable therewith and of greater molecular weight than propylene are polymerized in a single site catalyst catalized polymerization reaction, char... | 11/11/2008 |
| 7411023 | Pipe for hot fluids A polymer pipe for hot fluids, usually hot water is described. The pipe is characterised in that it comprises a multimodal polyethylene with a high molecular weight (HMW) fraction and a low molecular weight (LMW) fraction where said HMW fraction has a density of at ... | 08/12/2008 |
| 7407695 | High gloss polyethylene articles The present invention includes an end use article (i.e., an article of manufacture) and a process for making the same, wherein the end use article has a relatively high gloss and exhibits excellent processability over a wide range of processing conditions. The end u... | 08/05/2008 |
| 7399895 | Aluminum phosphate-supported group 6 metal amide catalysts for oligomerization of ethylene A catalyst composition for the preparation of oligomeric and/or polymer derivatives of olefin monomers, said composition comprising a Group 6 metal amide complex, a Group 1, 2, 12, 13, or 14 metal hydrocarbyl composition or compound, and a solid support comprising a... | 07/15/2008 |
| 7396892 | Process for removal of intermediate hydrogen from cascaded polyolefin slurry reactors Multimodal polyolefin polymers may be prepared in series-connected polymerization reactors where a prior reactor is a slurry reactor employing light solvent as the slurry medium and hydrogen to limit polymer molecular weight, the polymer product from the prior react... | 07/08/2008 |
| 7339019 | Ethylene-α-olefin copolymer A copolymer having monomer units derived from ethylene and monomer units derived from an α-olefin of 3 to 20 carbon atoms, a density of 906 to 970 kg/m3 and an activation energy of flow of 50 kJ/mol or more, and satisfying specific relations among a melt... | 03/04/2008 |
| 7335716 | Ethylene (co)polymers and uses thereof An ethylene (co)polymer of the present invention is a (co)polymer with excellent moldability and mechanical properties and either an ethylene homopolymer or a copolymer of ethylene and an α-olefin of 4 to 20 carbon atoms. The (co)polymer has methyl branches measure... | 02/26/2008 |
| 7335715 | Ethylene-alpha-olefin copolymer An ethylene-α-olefin copolymer having monomer units derived from ethylene and monomer units derived from an α-olefin of 3 to 20 carbon atoms, a density of 906 to 970 kg/m3, an activation energy of flow of 50 kJ/mol or more and a heat quantity of fusion ... | 02/26/2008 |
| 7323524 | Tandem tetramerisation-polymerisation of olefins The invention provides a process for polymerising olefins to branched polyolefins in the presence of a polymerisation catalyst and a cocatalyst, wherein the cocatalyst produces 1-octene in a selectivity greater than 30%. ... | 01/29/2008 |
| 7314901 | Polypropylene films Films disclosed herein contain a base or core layer comprising a first polypropylene, a second polypropylene, and a hydrocarbon resin. The base layers may also include other additives as described below. The first polypropylene is preferably a high crystallinity pol... | 01/01/2008 |
| 7312295 | Copolymers of ethylene and 1-heptene The present invention relates to a copolymer comprising units derived from ethylene and 1-heptene, to a composition comprising such a copolymer, and to an article prepared from or containing such a copolymer. ... | 12/25/2007 |
| 7312283 | Polymerization catalysts and process for producing bimodal polymers in a single reactor Catalyst compositions comprising a first metallocene compound, a second metallocene compound, an activator-support, and an organoaluminum compound are provided. Methods for preparing and using such catalysts to produce polyolefins are also provided. The compositions... | 12/25/2007 |
| 7307129 | Method for preparing latex containing pigment copolymerized with a crystalline polymer A method of preparing a latex that includes pigments copolymerized with a crystalline polymer includes: dispersing a pigment and a dispersing agent in water having an ultra-high purity to obtain a pigment dispersion; dissolving a crystalline monomer in a basic monom... | 12/11/2007 |
| 7307133 | Polymers having broad molecular weight distributions and methods of making the same Methods of polymerizing at least one olefin include contacting the olefin with a catalyst comprising chromium and with a cocatalyst comprising a non-transition metal cyclopentadienyl (Cp) compound. The polymerization may be performed in the presence of hydrogen. Usi... | 12/11/2007 |
| 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 molecular weight distribution. The ethylene-based copolymer has a high de... | 12/04/2007 |
| 7300988 | Single catalyst low, medium and high density polyethylenes A method of polymerizing olefins comprising combining in one embodiment ethylene and optionally one or more α-olefins with a catalyst composition in a continuous polymerization reactor at a pressure of less than 10,000 kPa; wherein the catalyst composition comprise... | 11/27/2007 |
| 7294681 | Mutliple catalyst system for olefin polymerization and polymers produced therefrom This invention relates to a polymer of one or more C3 to C40 olefins, optionally one or more diolefins, and less than 15 mole % of ethylene, and polymerization processes for producing the same. ... | 11/13/2007 |
| 7288596 | Polyethylene compositions having improved tear properties Disclosed are various compositions, including but not limited to a high density multimodal polyethylene composition, that has a density of 0.935 g/cc or more, and that includes a blend of a first polyethylene component and a second polyethylene component, in which: ... | 10/30/2007 |
| 7265193 | Polymerization process This invention relates to a process to polymerize olefins comprising: contacting: (i) propylene and (ii) a mixture comprising, optionally ethylene, and three or more different alpha olefins having ... | 09/04/2007 |
| 7259125 | Catalyst compositions comprising small silica support materials and methods of use in polymerization reactions Improved catalyst compositions, and polymerization processes using such improved catalyst compositions, are provided. An example of an improved catalyst composition is a supported catalyst system that includes at least one titanium compound, at least one magnesium c... | 08/21/2007 |
| 7250471 | Impact resistance polymer blends of crystalline polypropylene and partially crystalline, low molecular weight impact modifiers Polymer blends that exhibit good impact resistance comprise a crystalline polypropylene matrix and a partly crystalline copolymer impact modifier with a molecular weight lower than that of the matrix polymer. The matrix polymer can comprise any crystalline propylene... | 07/31/2007 |
| 7250470 | Crystallization of polypropylene using a semi-crystalline, branched or coupled nucleating agent A method of nucleating a propylene homo- or copolymer, the method comprising contacting the propylene polymer with a semi-crystalline branched or coupled polymeric nucleating agent under nucleation conditions. In one embodiment, the propylene homopolymer is characte... | 07/31/2007 |
| 7244787 | Elastic blends of semicrystalline propylene polymers and high glass transition temperature materials Compositions are provided having from 70 wt % to 95 wt % of a polymer selected from homopolymers and random copolymers of propylene and from 5 wt % to 30 wt % of a miscible hydrocarbon resin with a glass transition temperature greater than 20° C. The polymer has a ... | 07/17/2007 |
| 7238759 | Isotactic propylene copolymers, their preparation and use Unique copolymers comprising propylene, ethylene and/or one or more unsaturated comonomers are characterized as having: at least one, preferably more than one, of the following properties: (i) 13C NMR peaks corresponding to a regio-error at about 14.6 and... | 07/03/2007 |
| 7238765 | High density polyethylene and insulation compositions for wire and cable High density polyethylene having reduced melt elasticity and a reduced level of highly short-chain branched polymer molecules and wire and cable insulation compositions based thereon having improved strippability and oxidative stability are provided. ... | 07/03/2007 |
| 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 supported complex. The supported complex is subsequently combined with a se... | 06/12/2007 |
| 7223823 | Catalyst system and process This invention relates to a process of polymerizing ethylene in a reactor comprising contacting a catalyst system comprising a supported chromium catalyst and an aluminum alkyl cocatalyst, where the catalyst and cocatalyst are contacted by cofeeding the catalyst and... | 05/29/2007 |
| 7223822 | Multiple catalyst and reactor system for olefin polymerization and polymers produced therefrom Disclosed is a process for producing branched polymers including at least 50 mol % C3–C40 olefins. The process may include: (1) feeding a first catalyst, an activator, and one or more C2–C40 olefins into a first reacti... | 05/29/2007 |
| 7220801 | Metallocene-produced very low density polyethylenes or linear low density polyethylenes as impact modifiers In one embodiment, the present invention is directed to an article, such as a blow-molded bottle, formed from a polymer blend composition. In one aspect, the article is formed by blow-molding techniques. In one aspect, the article is a blow-molded container having a... | 05/22/2007 |
| 7208559 | Ethylened polymer and molded object obtained therefrom An ethylene-based polymer which is an ethylene/C4 to C10 α-olefin copolymer and satisfies the following requirements [k1] to [k3]: [k1] melt flow rate (MFR) under a loading of 2.16 kg at 190° C. is in the range of 1.0 to 50 g/10 minutes; [k2] LNR defined as a scal... | 04/24/2007 |
| 7199203 | Isotactic propylene copolymer fibers, their preparation and use Fibers comprising a propylene homopolymer or a copolymer of propylene and at least one of ethylene and one or more unsaturated comonomers exhibit desirable properties. The homopolymers are characterized as having 13C NMR peaks corresponding to a regio-err... | 04/03/2007 |
