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| Number | Title | Issue Date |
| 8084557 | Gas-phase process for the polymerization of alpha-olefins A continuous gas-phase process for the polymerization of alpha-olefins, in particular ethylene, comprising passing an alpha-olefin monomer stream through an oil filter in order to reduce the amount of oil to less than 8 ppm, and polymerizing the thus purified monome... | 12/27/2011 |
| 8013082 | Processes for correlating UV-VIS spectra of norbornene compound to polymerization processes using the same, and related purification methods and compositions The invention provides a process of polymerizing ethylene and at least one α-olefin, said process comprises polymerizing the ethylene and the at least one α-olefin in the presence of 5-ethylidene-2-norbornene, which comprises low levels of impurities, as determine... | 09/06/2011 |
| 7960485 | Method for producing water-absorbing polymers The invention relates to processes for preparing water absorbing polymers by polymerization of a monomer solution comprising allyl acrylate and/or allyl alcohol, the solution comprising not more than 0.002% by weight of allyl acrylate and/or allyl alcohol, based on ... | 06/14/2011 |
| 7932329 | Use of alkali metal-silica gel (M-SG) materials in solvent and monomer drying and purification for their use in anionic polymerization Stage I Group 1 metal/porous metal oxide compositions or Stage II Group 1 metal/porous metal oxide compositions are shown to be useful to remove impurities and act as drying agents for various types of solvents and for olefinic monomers used in anionic polymerizatio... | 04/26/2011 |
| 7772336 | Method for producing α-methylstyrene and heat-resistant styrene-based copolymer using the α-methylstyrene An object of the present invention is to provide highly pure α-methylstyrene by efficiently removing polar substances present in the α-methylstyrene. The present invention discloses a method for purifying α-methylstyrene by reacting polar substances contained in ... | 08/10/2010 |
| 7709585 | Ethylene recovery from a polymerization process A method for solution polymerizing ethylene wherein an ethane purge stream is separated, subjected to high efficiency cryogenic distillation, and a side cut from that distillation recycled to the polymerization process while the overhead and bottoms from that distil... | 05/04/2010 |
| 7700698 | Process for producing ring-opening metathesis polymer A process of producing a ring-opening metathesis polymer characterized in that a treatment to decrease the amount of oxygen and/or peroxide in at least one kind of polymerization starting material is performed prior to the ring-opening metathesis polymerization reac... | 04/20/2010 |
| 7339007 | Low sediment process for thermally reacting highly reactive polymers and enophiles A process for forming an ene reaction product wherein an enophile, such as maleic anhydride, is reacted with reactive polyalkene having a terminal vinylidene content of at least 30 mol. %, at high temperature in the presence of a free radical inhibitor. The polyalke... | 03/04/2008 |
| 7238743 | Production process for water-absorbent resin The present invention provides a process for producing a water-absorbent resin of which the residual monomer content and the extractable content are low. The process for producing a water-absorbent resin comprises the step of polymerizing at least one monomer compon... | 07/03/2007 |
| 7205447 | Process for removing aldehydes and/or ketones from an olefinic stream The present invention provides a process for removing an oxygenate impurity selected from aldehyde and/or ketone, from an olefinic product stream. A product stream is contacted with a metal oxide-containing catalyst in the presence of a C1 to C6 | 04/17/2007 |
| 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 |
| 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 |
| 7141631 | Non-conjugated cyclic diene, non-conjugated cyclic diene composition and method of producing polymer based on non-conjugated cyclic diene It is an object of the present invention to provide a non-conjugated cyclic diene and a non-conjugated cyclic diene composition which enable the production of a polymer based on non-conjugated cyclic diene which makes it possible to produce a (co)polymer at a high d... | 11/28/2006 |
| 7128815 | Process for recovery of pure acrylonitrile Process for recovery of highly pure acrylonitrile by quickly vaporizing under vacuum the contaminated acrylonitrile as well as fresh acrylonitrile followed by contacting with hydrophilic agents in an extractive distillation column using plural number of packed secti... | 10/31/2006 |
| 7102049 | Process for operating a quench device in an oxygenate-to-olefin production unit The present invention is a process for producing olefin(s) from oxygenates that is more effective than previously known processes at removing carbon dioxide from the effluent stream by operating a quench tower at a pH greater than 7.0. ... | 09/05/2006 |
| 7094724 | Catalytic solid supported on calcined hydrotalcite for olefinic polymerisation Catalyst solid for olefin polymerization comprising A) at least one calcined hydrotalcite and B) at least one organic transition metal compound, and also a catalyst system comprising the catalyst solid, the use of the catalyst sol... | 08/22/2006 |
| 7067597 | Process of making polypropylene from intermediate grade propylene This invention concerns using an intermediate grade propylene stream as feed to a polypropylene forming reaction system. The intermediate grade propylene stream is preferably recovered form the olefin product of an oxygenate to olefins reaction process, and low in d... | 06/27/2006 |
| 7060866 | High pressure separation of dimethyl ether from an olefin stream Disclosed is a method of removing dimethyl ether from an ethylene and/or propylene containing stream. Dimethyl ether is removed at a high pressure, preferably in a distillation column. The high pressure separation has the benefit of providing a relatively low bottom... | 06/13/2006 |
| 7049366 | Acrylic acid composition and its production process, and process for producing water-absorbent resin using this acrylic acid composition, and water-absorbent resin In order to produce inexpensively with high productivity a water-absorbent resin of which: the residual monomer content and the water-extractable content are both low, and the properties are high, and the colorability is low; there is provided a process for producin... | 05/23/2006 |
| 7009010 | Water-absorbent resin and production process therefor To provide: a process in which a coarse gel itself is made not to form in the case of applying the aqueous solution polymerization; and a process in which the polymerization is mildly controlled and the production is stably carried out in the case of applying the re... | 03/07/2006 |
| 6987152 | Feed purification at ambient temperature A method for olefin polymerization is provided. A feed stream comprising more than 0.1 ppm by volume of oxygen and 0.3 ppm by volume of water is passed through a first packed bed to selectively remove at least a portion of the oxygen. The feed stream is then passed ... | 01/17/2006 |
| 6977283 | Polymerization process The present invention relates to a process for polymerizing monomer and comonomer(s) utilizing a bulky ligand transition metal metallocene-type catalyst or catalyst system, where the process is operated in the absence of or with a low amount of any of the isomers of... | 12/20/2005 |
| 6969739 | Rubber composition A diene polymer rubber composition comprising (A) 100 parts by weight of a raw material rubber comprising (A-1) a diene rubbery polymer which is a conjugated diene rubber polymer or conjugated diene-styrene rubbery copolymer (1) containing a modified component in an... | 11/29/2005 |
| 6933351 | Process for forming polyalkenyl acylating agents A process for producing polyalkenyl acylating agent, wherein, upon completion of the thermal reaction of a polyalkene and an unsaturated mono- or dicarboxylic acid or anhydride compound, the reaction mixture is allowed to cool to below the reaction temperature, an a... | 08/23/2005 |
| 6927268 | Production process for water-absorbent resin The present invention provides a process for producing a water-absorbent resin of which the residual monomer content and the extractable content are low. The process for producing a water-absorbent resin comprises the step of polymerizing at least one monomer compon... | 08/09/2005 |
| 6924248 | Catalyst system for carrying out olefin polymerization comprising a calcined hydro-talcite serving as a supporting material Catalyst system for olefin polymerization comprising A) at least one calcined hydrotalcite, B) at least one organic transition metal compound, C) optionally one or more cation-forming compounds and D) at least one ... | 08/02/2005 |
| 6906152 | Rubber compositions The present invention provides a diene rubber composition having excellent processability and being improved in both the balance between low rolling resistance and wet skid resistance, and strength properties. The composition according to the invention is a diene po... | 06/14/2005 |
| 6844480 | Method of separating dimethyl ether from an olefin stream This invention is directed to a method of removing dimethyl ether from an olefin stream. Dimethyl ether is removed from the olefin stream by first separating the olefin stream into a first stream comprising dimethyl ether and lighter boiling point compounds, and a s... | 01/18/2005 |
| 6825290 | Process for the preparation of latices using block copolymers as surfactants A subject-matter of the present invention is a process for the preparation of a latex by radical aqueous emulsion polymerization in the presence of at least one ethylenically unsaturated monomer, of at least one radical polymerization initiator and of at least one s... | 11/30/2004 |
| 6559248 | Process of removing contaminants from an olefin stream using extractive distillation Disclosed is a method of purifying olefin containing oxygenate contaminants. The method incorporates the use of extractive distillation. Under the appropriate conditions, olefins containing very low levels of oxygenate contaminants can be recovered.... | 05/06/2003 |
| 6476162 | Method for preventing easily polymerizing substance from polymerization and method for production of (meth) acrylic acid or ester thereof In a packed column handling an easily polymerizing substance, the packing with which the column is stuffed is subjected to a water-repelling treatment or a wetting treatment to prevent the easily polymerizing substance in the packed column from polymerizi... | 11/05/2002 |
| 6458900 | Process for preparing polyolefins The invention relates to a process for the production of polyolefins in a reactor system which comprises at least one gas-phase reactor with at least one monomer is polymerized. According to the process, there is fed into the gas-phase reactor the monomer... | 10/01/2002 |
| 6444744 | Hydrophilic resin, absorbent article, and acrylic acid for polymerization The invention provides a hydrophilic resin and an absorbent article, both of which display still less coloring and discoloring when preserved for a long time. The hydrophilic resin is any one of: 1) a hydrophilic resin, obtained by a process including the... | 09/03/2002 |
| 6403743 | Petroleum resins and their production with supported catalyst Petroleum resins are produced by using a supported halide based Lewis acid polymerization catalyst wherein the Lewis acid is chemically bound to the support and free hydrogen halide and/or alkane formed by the reaction of the Lewis acid with the support h... | 06/11/2002 |
| 6291544 | Reactive esters of 2-cyanopenta-2,4-dienoic acid and the adhesives and polymers thereof The present invention provides pure, storage stable, reactive esters of 2-cyanopenta-2,4-dienoic acid and the adhesives and polymers thereof. The monomers of the present invention have the formula: ##STR1## where R is alkyl, alkenyl, alkynyl, alkoxyalkyl,... | 09/18/2001 |
| 6288178 | Process for reducing transient operation time in polymerization reactors In the operation of a gas phase polymerization reactor, a significant amount of production time and material can be lost during the transition from initial process conditions for the production of one product to the desired process conditions for the prod... | 09/11/2001 |
| 6271319 | Membrane-augmented polypropylene manufacturing A process for polypropylene manufacturing, including treating a vent stream from the polymerization reactor, to recover propylene for return to the reactor. The process involves using a gas separation membrane to separate propylene from propane in the rea... | 08/07/2001 |
| 6258901 | Process for producing lightly colored p-vinylphenol polymer There is provided a process for efficiently and economically producing a polymer which is superior in transmittances of visible light and far-ultraviolet light, has a high molecular weight and is light-colored. A process for producing a light-colored viny... | 07/10/2001 |
| 6124410 | Method for purification of alpha-olefins for polymerization use and method for production of poly-alpha-olefins The invention provides a method for purification of an -olefin selected from ethylene and propylene for polymerization use which comprises contacting the -olefin with an alkali metal carried on a support material. The invention further provi... | 09/26/2000 |
| 5977274 | Method for making polymers from N-vinyl formamide monomer The present invention is directed to precipitation polymerization processes for the manufacture of polymers prepared from N-vinyl formamide monomer, the processes including the steps of contacting the N-vinyl formamide monomer with a polymerization medium... | 11/02/1999 |
