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| Number | Title | Issue Date |
| 8183334 | Slurry phase polymerisation process Process for producing a multimodal polyethylene in at least two reactors connected in series, in which 20-80 wt % of a high molecular weight (HMW) polymer is made in suspension in a first reactor and 20-80 wt % of a low molecular weight (LMW) polymer is made in susp... | 05/22/2012 |
| 8183332 | Slurry phase polymerisation process Process for producing a multimodal polyethylene in at least two reactors connected in series, in which 20-80 wt % of a high molecular weight (HMW) polymer is made in suspension in a first reactor and 20-80 wt % of a low molecular weight (LMW) polymer is made in susp... | 05/22/2012 |
| 8183333 | Slurry phase polymerisation process Polymerisation process in which polyethylene is produced in slurry in a polymerisation reactor in the presence of a Ziegler Natta catalyst and an activator, and a stream or slurry containing the polymer is withdrawn from the reactor and transferred to a flash tank o... | 05/22/2012 |
| 8153734 | Process for preparing a polyethylene resin in a double loop reactor with a mixture of bis-indenyl and bis-tetrahydroindenyl The present invention discloses a process for preparing polyethylene resins in a double loop reactor wherein the catalyst system comprises a bis-tetrahydroindenyl and a bis-indenyl catalyst component deposited on the same support. It also discloses the polyethylene ... | 04/10/2012 |
| 8148476 | Slurry phase polymerisation Process for transferring a slurry stream containing polymer through a transfer line from a polymerisation reactor to a downstream vessel by, prior to entry into the downstream vessel, separating the slurry stream into two flows, the first flow being recycled upstrea... | 04/03/2012 |
| 8148477 | Tubular flow reactor and method of manufacturing polymeric resin fine particle In the present invention, a tubular flow reactor can maintain a plug flow property even though the tubular flow reactor is downsized, and provided is the tubular flow reactor with which uniform resin fine particles exhibiting a narrow particle size distribution and ... | 04/03/2012 |
| 8138282 | Loop reactor suitable for olefin polymerization with improved product removal means The present invention relates to a loop reactor suitable for olefin polymerization process comprising: a plurality of interconnected pipes defining a flow path for a polymer slurry, said slurry consisting essentially of an olefin r... | 03/20/2012 |
| 8129483 | Circulating fluidized bed reactor A continuous gas phase circulating bed reactor, including: a riser for contacting a catalyst and a first gas composition comprising an olefin to form a polyolefin under fast-fluidization regime or a dilute-phase pneumatic conveying regime conditions; a downer for co... | 03/06/2012 |
| 8106136 | Optimisation of the ethylene polymerisation process A method for ethylene slurry polymerisations in a loop reactor in the presence of ethylene monomer, diluent and catalyst and optionally co-monomer and hydrogen, wherein the polymerisation temperature is maintained below the swelling temperature, characterised in tha... | 01/31/2012 |
| 8101692 | Slurry phase polymerisation process A process comprising polymerising in a loop reactor of continuous tubular construction an olefin monomer optionally together with an olefin comonomer in the presence of a polymerisation catalyst in a diluent to produce a slurry comprising solid particulate olefin po... | 01/24/2012 |
| 8101693 | Multi reactor process This invention relates to the polymerization of ethylene polymers using a continuously stirred tank reactor (CSTR) that is connected in series to a tubular reactor. The tubular reactor receives a polymer solution from the CSTR. Further polymerization in the tubular ... | 01/24/2012 |
| 8097686 | Multistage process for the polymerization of olefins A process for the multistage polymerization of olefins in a sequence of an upstream slurry reactor and a downstream gas-phase reactor, the transfer of polymer from the upstream reactor to the downstream reactor comprising the following steps: a) heating... | 01/17/2012 |
| 8067509 | Reactor systems and processes for using the same A process for the polymerization of olefin's, including: introducing an olefin and a polymerization catalyst into a polymerization reactor to form a polyolefin, the polymerization reactor including: a fluidized bed region having a top and a bottom; and a motive bed ... | 11/29/2011 |
| 8063158 | Polymerization process and associated apparatus There are disclosed polymerization processes and associated apparatuses. The polymerization processes involve both making a polymeric material in a fluidized bed reactor having a feed distributor and catching a spitwad with a spitwad catcher, and the apparatuses are... | 11/22/2011 |
| 8058367 | Methods and systems for controlling polymer particle size Techniques are provided for producing polymer particles of a size just slightly larger than the size of polymer fines. The technique may prevent or limit the occurrence of reactor fouls associated with large polymer particles. The technique also may provide a greate... | 11/15/2011 |
| 8058366 | Polymerization monitoring and method of selecting leading indicators Embodiments of our invention relate generally to methods of monitoring and controlling polymerization reactions including reactions producing multimodal polymer products using multiple catalysts in a single reactor. Embodiments of the invention provide methods of ra... | 11/15/2011 |
| 8048971 | Process for the production of polyethylene and ethylene copolymers The invention provides a process and an apparatus for the high pressure polymerization of ethylene in which a jet pump is used to pump a fluid into a polymer/monomer product mixture leaving a bumped tubular reactor. The fluid may be recycled monomer or another fluid... | 11/01/2011 |
| 8039562 | Method for seed bed treatment before a polymerization reaction In some embodiments, a method in which at least one continuity additive (“CA”) and a seed bed are pre-loaded into a reactor, and a polymerization reaction is optionally then performed in the reactor. In other embodiments, at least one flow improver, at least one... | 10/18/2011 |
| 8026322 | Method and apparatus for controlling the recovery of solid polyolefin from a continuous reaction zone A Polymerisation process and a loop reactor comprising polymerising olefins in a liquid diluent to produce a liquid slurry containing particles of normally solid polymer within the loop reactor, allowing the polymer to settle in a settling leg, periodically opening ... | 09/27/2011 |
| 8008412 | Polymer production at supersolution conditions This invention relates to a process to polymerize olefins comprising contacting propylene, at a temperature of 65° C. to 150° C. and a pressure of 1.72 to 34.5 MPa, with: 1) a catalyst system comprising one or more activators and one or more nonmetallocene metal-c... | 08/30/2011 |
| 7994264 | Slurry phase polymerisation process Process comprising polymerizing in a loop reactor of a continuous tubular construction an olefin monomer optionally together with an olefin comonomer in the presence of a polymerization catalyst in a diluent to produce a slurry comprising solid particulate olefin po... | 08/09/2011 |
| 7985813 | Slurry phase polymerisation process A process comprising polymerising in a loop reactor of a continuous tubular construction an olefin monomer optionally together with an olefin comonomer in the presence of a polymerisation catalyst in a diluent to produce a slurry comprising solid particulate olefin ... | 07/26/2011 |
| 7981983 | Slurry phase polymerisation process A process for controlling a slurry phase (co-) polymerisation process in the presence of a polymerisation catalyst, which comprises maintaining the density SPAN of the polymer powder particles (defined as the absolute value of the density difference in g/cm3 | 07/19/2011 |
| 7981982 | Process for the preparation of soft propylene polymer compositions A process for the preparation of a propylene copolymer composition having a Flexural modulus lower than 500 MPa, a total ethylene content higher than 9% and a Xylene soluble fraction at room temperature higher than 20% comprising at least one polymerization step car... | 07/19/2011 |
| 7960484 | Method for transitioning between ziegler-natta and metalocene catalysts in a bulk loop reactor for the production of polypropylene Polymerization processes in a bulk loop reactor are described herein. In particular, a method of contacting a flow of metallocene with a flow of propylene is provided. This method includes directing the flow of metallocene towards a junction, directing the flow of p... | 06/14/2011 |
| 7956137 | Loop reactor for emulsion polymerisation A polymerisation reactor comprising one or more circulation loops with one or more inlets for raw material, one or more outlets, and a circulation pump for circulating a reactor charge within the circulation loop. A by-pass line for by-passing the circulation pump c... | 06/07/2011 |
| 7906598 | Recirculation loop reactor bulk polymerization process A process for producing polymer and more particularly adhesive using a recirculating loop reactor. In one embodiment the reactor includes one or more mixers to mix feed stock with the polymerized material recirculating in the reactor. In another embodiment a planeta... | 03/15/2011 |
| 7906597 | Method and apparatus for preparing and supplying catalyst slurry to a polymerization reactor The present invention relates to an apparatus for preparing and supplying catalyst to an ethylene slurry loop polymerisation reactor and to an apparatus for controlling the injection of catalyst slurry in a polymerization reactor wherein polyethylene is prepared. Th... | 03/15/2011 |
| 7902307 | Olefin polymerization process with optimized product discharge The present invention relates to a polymerization process for producing olefin polymers in a loop reactor comprising the steps of: introducing into the loop reactor one or more olefin reactants, polymerization catalysts and diluents, and while circulating said react... | 03/08/2011 |
| 7863393 | Method for producing polyoxymethylenes Process for preparation of polyoxymethylenes via polymerization of the monomers a) in the presence of cationic initiators b), and also, if appropriate, in the presence of regulators c), and subsequent deactivation and isolation of the polymer, which comprises undert... | 01/04/2011 |
| 7858714 | Polymerization process This invention is directed to processes of making polymer in the presence of a fluorinated hydrocarbon and recovering the polymer. The processes provided enable polymerization processes to be practiced with minimal fouling in the reaction system, and allows for the ... | 12/28/2010 |
| 7858715 | Loop reactor for emulsion polymerisation Method of emulsion polymerization wherein a reactor comprising a closed reactor loop is continuously charged with fresh monomers and water phase at substantially the same rate as the rate of an overflow of reactor charge discharged into a secondary line section. The... | 12/28/2010 |
| 7851566 | Interconnected loop reactors The present invention describes a reactor comprising two interconnected loops wherein the growing polymer flows continuously in circuit from the first loop to the second loop through a First pipe and back to the first loop through a second pipe. It also discloses pr... | 12/14/2010 |
| 7829640 | Recirculation loop reactor bulk polymerization process A process for producing polymer and more particularly adhesive using a recirculating loop reactor. In one embodiment the reactor includes one or more mixers to mix feed stock with the polymerized material recirculating in the reactor. In another embodiment a planeta... | 11/09/2010 |
| 7816465 | Process for producing polyethylene Process and apparatus for continuously producing olefin polymers in a slurry phase reactor in a hydrocarbon diluent or liquid monomer. The process comprises continuously withdrawing from the slurry phase reactor a polymer slurry containing polymer and a fluid phase,... | 10/19/2010 |
| 7795359 | Continuous process for production of polymeric materials The invention provides a continuous-flow process for producing a polymeric material. The process of the invention comprises the steps of: introducing at least two solutions, each comprising one or more reactants, into a microreactor to mix the two solutions to form ... | 09/14/2010 |
| 7781546 | Slurry phase polymerisation process A process comprising polymerising in a loop reactor of continuous tubular construction an olefin monomer optionally together with an olefin comonomer in the presence of a polymerisation catalyst in a diluent to produce a slurry comprising solid particulate olefin po... | 08/24/2010 |
| 7781545 | Process for the catalytic polymerization of olefins, a reactor system, its use in the process, the polyolefins obtained and their use The present invention relates to a process for the catalytic polymerization of olefins comprising the steps of; i) a first polymerization in a first reactor, wherein olefins are polymerized with a particulate catalyst, hydrogen and optional a comonomer in a fluidum ... | 08/24/2010 |
| 7763685 | Method of discharging a polymer from a polymerization reactor A method of discharging polymer from a continuously operated polymerization reactor, wherein at least a monomer is polymerized to form polymer particles, the method comprising adjusting the discharge rate of the polymer particles by means of a piston valve having a ... | 07/27/2010 |
| 7745551 | Low gel chromium catalysis The present invention discloses the use of a chromium-based catalyst system in two serially connected loop reactors for copolymerising ethylene and a comonomer, at reduced productivity, the final polyethylene having a reduced amount of gel. ... | 06/29/2010 |
