Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 8441250 | Method and apparatus for monitoring electrical properties of polymerization reactor wall film Disclosed is a method for using at least one static probe during polymerization in a fluid bed polymerization reactor system to monitor a coating on a surface of the reactor system and a distal portion of each static probe, wherein the coating is exposed to flowing ... | 05/14/2013 |
| 8435914 | Mixed metal catalyst systems having a tailored hydrogen response A polymerization catalyst system and polymerization processes using the catalyst systems are disclosed. The polymerization catalyst systems may include a) a first catalyst compound, and b) a second catalyst compound, wherein the first catalyst compound includes an o... | 05/07/2013 |
| 8433443 | Method for on-line monitoring and control of polymerization processes and reactors to prevent discontinuity events Generally, a method of monitoring a polymerization reaction in a fluid bed reactor to generate, in on-line fashion, data indicative of the imminent occurrence of a discontinuity event (for example, sheeting) and optionally also control the reaction to prevent the oc... | 04/30/2013 |
| 8420754 | Production of polyethylene The present invention is directed to the use of aluminum alkyl activators and co-catalysts to improve the performance of chromium-based catalysts. The aluminum alkyls allow for the variable control of polymer molecular weight, control of side branching while possess... | 04/16/2013 |
| 8420733 | Continuity additives and their use in polymerization processes A continuity additive according to one general approach includes a substance having an ability to reduce, prevent, or mitigate at least one of fouling, sheeting, and static level of a material present in a polymerization reactor system when added to the reactor syst... | 04/16/2013 |
| 8404612 | Catalyst compositions and methods of making and using the same Catalyst compositions for the polymerization of olefins having improved flowability properties are provided. ... | 03/26/2013 |
| 8399581 | Polyethylene films with improved physical properties Metallocene catalyzed polyethylenes are found to have improved physical properties, improved processability and improved balance of properties. Surprisingly, there is a direct relationship between MD shrinkage, and MD tear. Additionally, MD tear is greater than TD t... | 03/19/2013 |
| 8383739 | Systems and methods for monitoring a polymerization reaction Systems and methods for monitoring a polymerization reactor are provided. The method can include estimating an acoustic condition of a polymer produced in a reactor. The method can also include estimating a stickiness control parameter of the polymer produced in the... | 02/26/2013 |
| 8383730 | Bimodal polyethylene compositions for blow molding applications Bimodal polyethylene compositions and methods for making the same are provided. In at least one specific embodiment, the bimodal polyethylene composition can include a high molecular weight component having a weight average molecular weight (Mw) of from about 400,00... | 02/26/2013 |
| 8378043 | Ethylene alpha olefin copolymers and polymerization processes for making the same A process for the production of an ethylene alpha-olefin copolymer is disclosed. The process includes polymerizing ethylene and at least one alpha-olefin by contacting the ethylene and the at least one alpha-olefin with a metallocene catalyst in at least one gas pha... | 02/19/2013 |
| 8378040 | Methods for cleaning the distributor plate in a fluidized bed reactor system A method for cleaning a distributor plate in a fluidized bed polymerization reactor system according to one embodiment includes, in a first mode, operating with about a normal, baseline value of superficial gas velocity in a fluidized bed polymerization reactor syst... | 02/19/2013 |
| 8378029 | Polyethylene compositions Provided are various compositions, including but not limited to a bimodal polyethylene composition having a density of 0.940 g/cc or more, the composition comprising a high molecular weight polyethylene component and a low molecular weight polyethylene component, wh... | 02/19/2013 |
| 8329835 | Polyethylene compositions having improved properties Polyethylene compositions having improved properties are provided. In one aspect, a polyethylene composition having a long chain branching index (g′avg) of 0.5 to 0.9; a Melt Flow Rate (MFR) of greater than (49.011×MI(−0.4304)), where MI i... | 12/11/2012 |
| 8318872 | Method for controlling bimodal catalyst activity during polymerization A method of performing a polymerization reaction in a gas phase polymerization reactor to produce a bimodal polymer while controlling activity of a bimodal polymerization catalyst composition in the reactor by controlling concentration of at least one induced conden... | 11/27/2012 |
| 8293853 | Raw material efficiency method and process A method and apparatus are disclosed for controlling product discharge from a fluidized bed reactor and for minimizing the loss of the unreacted monomer in the fluidizing gas upon removing the solid polymer product from the reactor. The method and apparatus utilize ... | 10/23/2012 |
| 8281796 | Slurry catalyst flow splitters and methods of using the same A system for feeding a slurry catalyst composition including: a primary slurry feed system comprising a primary slurry flow meter and a primary catalyst injection device, wherein the primary slurry flow meter measures a primary slurry catalyst composition flow rate ... | 10/09/2012 |
| 8273834 | Methods for determining temperature value indicative of resin stickiness from data generated by polymerization reaction monitoring In some embodiments, a method including the steps of monitoring a polymerization reaction which produces a polymer resin in a fluid bed reactor, where a dry melt reference temperature is characteristic of melting behavior of a dry version of the resin, and in respon... | 09/25/2012 |
| 8247588 | Catalyst and compositions and methods of making and using the same Catalyst compositions for the polymerization of olefins having improved flowability properties are provided. ... | 08/21/2012 |
| 8227564 | Ethylene copolymers and their uses The invention provides for ethylene copolymers having a polymodal CD, wherein under temperature rising elution fractionation (TREF) analysis the ethylene copolymers evidence at least two peaks. ... | 07/24/2012 |
| 8227552 | Methods of controlling polymer properties The invention generally provides for methods for controlling polymer properties. In particular, invention provides for methods for controlling the comonomer composition distribution of polyolefins such as ethylene alpha-olefin copolymers by altering at least one or ... | 07/24/2012 |
| 8222176 | Bimetallic catalyst, method of polymerization and bimodal polyolefins therefrom Bimetallic catalysts, and methods of producing a bimetallic catalyst comprising a modified Ziegler-Natta catalyst and a metallocene are provided, in one embodiment the method including combining: (a) a Ziegler-Natta catalyst comprising a Group 4, 5 or 6 metal halide... | 07/17/2012 |
| 8206654 | Catalyst feed systems and methods for using the same Catalyst feed systems and processes utilizing such systems are described herein. Some embodiments disclosed herein relate to a process for improving the flowability of catalyst in a catalyst feed system, including providing a catalyst feed vessel with at least one h... | 06/26/2012 |
| 8202940 | Bimodal polyethylene compositions for blow molding applications Bimodal polyethylene compositions and methods for making the same are provided. In at least one specific embodiment, the bimodal polyethylene composition can include a high molecular weight component having a weight average molecular weight (Mw) of from about 400,00... | 06/19/2012 |
| 8192690 | Methods and devices for polymerization A method of treating a gas phase fluidized bed reactor and a method of polymerizing olefins in a gas phase fluidized bed reactor in the presence of a catalyst prone to cause sheeting by introducing a chromium-containing compound into the reactor and forming a high m... | 06/05/2012 |
| 8153068 | Method of using an upper discharge in a fluidized bed reactor and system thereof A method according to one embodiment includes operating a reactor or providing a reactor after operation, wherein the reactor includes a bottom section, a bed section above the bottom section, a distributor plate between the bottom section and the bed section, an ex... | 04/10/2012 |
| 8148481 | Method for seed bed treatment for a polymerization reaction A method for preparing a reactor for performance of a polymerization reaction, the method including providing at least one seed bed into the reactor; wherein the at least one seed bed includes at least one organometallic compound and polymer particles. ... | 04/03/2012 |
| 8129486 | Discharge systems and methods of using the same A discharge system for removing a solid/gas mixture from a fluidized bed pressure vessel is provided. The discharge system includes a fluidized bed pressure vessel, a settling vessel, a transfer vessel, discharge line, primary discharge valve, and primary exit valve... | 03/06/2012 |
| 8129485 | Integrated hydrocarbons feed stripper and method of using the same Systems and methods for removing a volatile catalyst poison from a liquid hydrocarbon are provided. In one embodiment, a process vent (106) can be introduced to a vent recovery system (108) to provide a recycle gas (110). A first portion of the ... | 03/06/2012 |
| 8129484 | Blow molding polyethylene resins Disclosed herein are various processes, including continuous fluidized-bed gas-phase polymerization processes for making a high strength, high density polyethylene copolymer, comprising (including): contacting monomers that include ethylene and optionally at least o... | 03/06/2012 |
| 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 |
| 8129481 | Methods for applying solution catalysts to reactor surfaces A method for treating at least one interior surface (for example, a bed wall) of a fluidized bed polymerization reactor system, including by applying a solution catalyst (preferably at least substantially uniformly and in liquid form) to each surface, and optionally... | 03/06/2012 |
| 8124696 | Method of using an upper discharge in a fluidized bed reactor and system thereof A method according to one embodiment includes operating a reactor or providing a reactor after operation, wherein the reactor includes a bottom section, a bed section above the bottom section, a distributor plate between the bottom section and the bed section, an ex... | 02/28/2012 |
| 8101691 | Systems and methods for fabricating polymers Disclosed herein are various methods and systems for gas and liquid phase polymer production. In certain embodiments, the methods comprise manipulating properties of polymers produced by adjusting the hydrogen feed rate. ... | 01/24/2012 |
| 8088871 | Catalyst systems and polymerization processes A method of polymerizing olefins with catalyst systems, such as, for example, a multimodal catalyst system, wherein the catalyst system is stored at a controlled temperature to minimize loss of catalyst system productivity. ... | 01/03/2012 |
| 8088870 | Methods for applying solution catalysts to reactor surfaces A method for treating at least one interior surface (for example, a bed wall) of a fluidized bed polymerization reactor system, including by applying a solution catalyst (preferably at least substantially uniformly and in liquid form) to each surface, and optionally... | 01/03/2012 |
| 8088704 | Polymerization catalysts and methods of using the same to produce polyolefin products Polymerization catalyst systems including three or more catalyst compounds are provided. Methods for olefin polymerization including the aforementioned catalyst systems are also provided. ... | 01/03/2012 |
| 8084560 | Polymerization processes using metallocene catalysts, their polymer products and end uses A process for the production of an ethylene alpha-olefin copolymer is disclosed, the process including polymerizing ethylene and at least one alpha-olefin by contacting the ethylene and the at least one alpha-olefin with a metallocene catalyst in at least one gas ph... | 12/27/2011 |
| 8084554 | Methods and devices for polymerization A method of treating a gas phase fluidized bed reactor and a method of polymerizing olefins in a gas phase fluidized bed reactor in the presence of a catalyst prone to cause sheeting by introducing a chromium-containing compound into the reactor and forming a high m... | 12/27/2011 |
| 8076262 | Production of broad molecular weight polyethylene Broad molecular weight polyethylene and polyethylene having a bimodal molecular weight profile can be produced with chromium oxide based catalyst systems employing alkyl silanols. The systems may also contain various organoaluminum compounds. Catalyst activity and m... | 12/13/2011 |
| 8067518 | Polymers made with metallocene catalysts, for use in rotomolding and injection molding products Ethylene alpha-olefin copolymers formed by contacting at least one supported metallocene catalyst, ethylene, and an alpha-olefin in a gas phase reactor are disclosed. In some embodiments, the polymer may have: a density of between 0.890 and 0.970 g/cc; a melt index ... | 11/29/2011 |
