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| Number | Title | Issue Date |
| 8022152 | Copolymers of vinyl- and allylsilanes Ethylene and allyl- or vinylsilanes are efficiently copolymerized by certain late transition metal complexes containing selected bidentate or tridentate ligands. The resulting novel polymers may be crosslinked by moisture when vinylsilane contains groups bound to si... | 09/20/2011 |
| 8013083 | Means for controlling the exothermic reaction of styrenic monomers with sulfonic acids A method for inhibiting the premature polymerization of styrenic monomers is disclosed wherein the method comprises adding to said monomers a combination of: (A) at least one inhibitor that is a sulfonic acid compound in a concentr... | 09/06/2011 |
| 7999046 | Neutralization of deactivated polymerization catalyst using phosphoric or phosphonic acid salts A process for deactivating an active catalyst species in an olefin polymer stream exiting a polymerization reactor and neutralizing catalyst residues, as well as reducing corrosion, plugging or fouling of olefin production and recovery equipment and imparting antiox... | 08/16/2011 |
| 7973111 | Mechanically operated kill agent injection safety system and method to stop a runaway chemical reaction Disclosed is a method to safely terminate a runaway reaction within a reaction vessel, comprising: sensing an increase in pressure in the reaction vessel, opening a barrier blocking a flow path into the reactor, wherein the barrier opening is achieved via a mechanic... | 07/05/2011 |
| 7960486 | Process for producing olefin polymer The purpose of the present invention is provite a process for producing an olefin polymer, which can produce an olefin polymer having a higher molecular weight even in the presence of hydrogen and can obtain an olefin polymer having good powder characteristics by lo... | 06/14/2011 |
| 7943708 | Method for the production of telechelic polymers The present invention relates to the coupling of two polymer chains to give end group-functionalized polymers, the simultaneous precipitation of transition metals from polymer solutions and to the removal of halogen atoms from polymer chain ends. ... | 05/17/2011 |
| 7776975 | Aqueous polymerization process for preparing an aqueous polymer dispersion The present invention relates to a process for preparing an aqueous polymer dispersion containing polymer particles dispersed in an aqueous medium. The process includes providing first polymer particles; adding a hydrophobic polymerization blocker or a styrenic mono... | 08/17/2010 |
| 7728083 | Aromatic sulfonic acids, amines and nitrophenols in combination with nitroxyl radical-containing compounds or C-nitrosoanilines as polymerization inhibitors Disclosed herein is a method for inhibiting and retarding the premature polymerization and the polymer growth of vinyl aromatic monomers wherein the method comprises adding to said monomers an effective amount of an inhibitor and retarder blend comprising: ... | 06/01/2010 |
| 7696290 | Aromatic sulfonic acids, amines, and nitrophenols in combination with nitroxyl radical-containing compounds or C-nitrosanilines as polymerization inhibitors Disclosed herein is a method for inhibiting and retarding the premature polymerization and the polymer growth of vinyl aromatic monomers wherein the method comprises adding to said monomers an effective amount of an inhibitor and retarder blend comprising: ... | 04/13/2010 |
| 7691952 | Sulfonated nitrophenols as polymerization inhibitors Disclosed herein is a method for inhibiting and retarding the premature polymerization and the polymer growth of ethylenically unsaturated monomers comprising adding to said monomers an effective amount of at least one inhibitor that is a sulfonated nitrophenol of t... | 04/06/2010 |
| 7683144 | Process for chain stopping of PVC polymerization The present invention relates to a process and composition for the chain stopping of vinyl chloride polymerization or copolymerization in the presence of a stable free nitroxyl radical and a phenolic antioxidant. A further subject of the invention is the use of a st... | 03/23/2010 |
| 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 wherein the polymer obtained in the first step is contacted with a c... | 04/29/2008 |
| 7351777 | Retarded anionic polymerization of vinyl aromatic monomers using insoluble or heterogeneous retardants This invention is a process to manufacture high quality vinyl aromatic polymer that is essentially free of unreacted vinyl aromatic monomer using retarded anionic polymerization wherein the retardant is insoluble and can be removed from the polymerization at an inte... | 04/01/2008 |
| 7351776 | Bulk polymerization process A method for the continuous production of polydienes, the method comprising the steps of (a) charging a mixture of one or more monomer, catalyst system, and less than 50% weight percent organic solvent based on the total weight of the monomer, catalyst and solvent, ... | 04/01/2008 |
| 7348388 | Copolymers of olefins and vinyl- and allylsilanes Ethylene and allyl- or vinylsilanes are efficiently copolymerized by certain late transition metal complexes containing selected bidentate or tridentate ligands. The resulting novel polymers may be crosslinked by moisture when vinylsilane contains groups bound to si... | 03/25/2008 |
| 7343225 | Method for reducing off-grade product production during reaction transitions In some embodiments, a method for determining initial conditions for a transition from an initial reaction to a target reaction to minimize (or substantially minimize) the amount of off-grade material produced during the transition, and optionally also process contr... | 03/11/2008 |
| 7300987 | Polymerization process The present invention relates to a continuous gas phase process comprising polymerizing one or more hydrocarbon monomer(s) in a fluidized bed reactor in the presence of catalyst system or polymerization catalyst and a condensable fluid for a period of at least 12 ho... | 11/27/2007 |
| 7276565 | Continuous miniemulsion polymerization process A process including: heating to a first polymerization temperature a first mixture including a free radical polymerizable monomer, a free radical initiator, and a stable free radical compound to polymerize only a portion of the mon... | 10/02/2007 |
| 7265191 | Multi-functional admixtures for hydraulic cement compositions A multi-functional admixture for simultaneously providing specified characteristics to hydraulic cement compositions such as concrete contains one or more of specified reaction mixtures obtained by specified two processes as well as partially or completely neutraliz... | 09/04/2007 |
| 7256247 | Polymerization of polyethylene having high molecular weight The present invention includes a bimodal polyethylene polymerization process wherein metallocene catalyst to is used to adjust the hydrogen response of a Ziegler-Natta catalyst. The polymerization may be carried out in a single reactor or in two or more reactors in ... | 08/14/2007 |
| 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 high molecular weight polymer into a low molecular weight polymer to... | 07/03/2007 |
| 7235614 | Methods for injecting catalyst into a polymerization reactor A polymerization process and a catalyst delivery system are provided. For example, a polymerization process is described, including providing a conduit having a catalyst inlet, a first propylene stream inlet located downstream of the catalyst inlet, and a second pro... | 06/26/2007 |
| 7232868 | Methods of delivering catalyst systems for propylene polymerization A polymerization process is provided. For example, a polymerization process is described, including providing a catalyst slurry having a metallocene catalyst and a first oil, providing a transport medium including a second oil and combining the transport medium and ... | 06/19/2007 |
| 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 |
| 7214642 | Methods of preparing active chromium/alumina catalysts via treatment with sulfate Methods of preparing a polymerization catalyst are provided that include contacting a support comprising alumina with a sulfating agent and with chromium. In an embodiment in which the chromium is provided from a chromium compound such as chromium oxide, the support... | 05/08/2007 |
| 7193012 | Dispersing agent comprising vinyl alcohol polymer having conjugated double bonds in its molecule A dispersing agent suitable for suspension polymerization of vinyl compounds, comprising a polyvinyl alcohol resin containing carbonyl groups in its molecule and having a block character of remaining fatty acid ester groups of at least 0.5 and an absorbance of at le... | 03/20/2007 |
| 7179870 | Method for the preparation of poly sg(a)-methylstyrene The invention relates to a process for the preparation of poly(α-methylstyrene) by anionic polymerization of the α-methylstyrene monomer, said process successively comprising the following stages: a) a stage of preparation of a solution comprising the... | 02/20/2007 |
| 7172987 | 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... | 02/06/2007 |
| 7166178 | Protective film and method for preparing same A high-quality protective film for a dry film resist is provided. A film of a polyethylene is used as the protective film, the polyethylene being prepared by pressurizing ethylene with use of an ultra-high pressure compressor and then polymerizing the ethylene at a ... | 01/23/2007 |
| 7163906 | Organochromium/metallocene combination catalysts for producing bimodal resins This invention relates to the field of olefin polymerization catalyst compositions, and methods for the polymerization and copolymerization of olefins, including polymerization methods using a supported catalyst composition. In one aspect, the present invention enco... | 01/16/2007 |
| 7160964 | Liquid phase process for the polymerization of α-olefins A liquid-phase process for polymerizing α-olefins of the formula CH2═CHR, where R is H or an alkyl radical C1–C6, to produce a polymer that is soluble in the reaction medium, comprising the steps of: a) continuously polymerizing in liquid phase the ... | 01/09/2007 |
| 7144963 | Catalytic polymerization process This invention relates to a process for controlling the architecture of copolymers of at least two unsaturated monomers, made by free-radical polymerization in the presence of a cobalt-containing chain transfer agent, including the control of molecular weight, degre... | 12/05/2006 |
| 7141630 | Methods of feed purification for olefin polymerization A polymerization process is provided. For example, a polymerization process is described, including contacting olefin monomers with a supported metallocene catalyst to polymerize the olefin monomers and form a product mixture that includes polyolefins macromers or p... | 11/28/2006 |
| 7129294 | Functional groups-terminated vinyl polymers A vinyl polymer which has at least one terminal functional group per molecule and has a ratio of weight average molecular weight to number average molecular weight of less than 1.8 as determined by gel permeation chromatography, said terminal functional group being ... | 10/31/2006 |
| 7122607 | Polymerization process The present invention relates to a continuous gas phase process comprising polymerizing one or more hydrocarbon monomer(s) in a fluidized bed reactor in the presence of catalyst system or polymerization catalyst and a condensable fluid for a period of at least 12 ho... | 10/17/2006 |
| 7112643 | Polymers having low levels of long chain branching and methods of making the same Methods of producing a polymer include contacting at least one olefin with a catalyst prepared by contacting a support comprising alumina with a sulfating agent and with chromium. Polymer compositions produced in this manner may exhibit relatively low levels of long... | 09/26/2006 |
| 7091288 | Polymerization of vinylidene fluoride (VF) in a supercritical fluid medium Polymerization of fluoroolefin monomers proceeds in a supercritical carbon dioxide solvent at high monomer loading levels to provide a high molecular weight polymer with low polydispersity and/or a unimodal molecular weight distribution. ... | 08/15/2006 |
| 7056991 | Method for transitioning between Ziegler-Natta and metallocene catalysts in a bulk loop reactor for the production of polypropylene The present invention relates to propylene polymerization process in a bulk loop reactor, and particularly to propylene polymerization process for polymerizing commercial quantities of polypropylene in a bulk loop reactor by sequentially introducing Ziegler-Natta an... | 06/06/2006 |
| 7045582 | Preparation process of copolymer for semiconductor lithography and a copolymer for semiconductor lithography available by this process Provided are a preparation process of a copolymer for semiconductor lithography, suited for a film forming composition used for the formation of minute patterns necessary for semiconductor fabrication, which comprises carrying out radical polymerization of at least ... | 05/16/2006 |
| 7037989 | Copolymers of ethylene and/or α-olefins and vicinally disubstituted olefins Substantially random ethylene and/or α-olefin copolymers containing units derived from vicinally disubstituted olefin monomers are described. The vicinally disubstituted olefin monomers may be represented by the generic formula (R1)CH═CH(R2)... | 05/02/2006 |
