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| Number | Title | Issue Date |
| 7838605 | Polymerization monitoring and control using improved 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... | 11/23/2010 |
| 7315369 | Method and apparatus for monitoring polyolefin production The present technique provides for the use of spectroscopic probes, such as Raman probes, within the conduits of a polyolefin production system. The Raman probe or other spectroscopic probes may be used to obtain spectroscopic measurements of the contents of the con... | 01/01/2008 |
| 7265190 | Process and apparatus for production of water-absorbent resin There is disclosed a process to uniformly and rapidly carry out the mixing of a monomer liquid and a polymerization initiator and thus for the resulting polymer not to adhere to the inner surface of the piping or the inside of the apparatus in an art of producing a ... | 09/04/2007 |
| 7211634 | Process for the preparation of polyesters containing 1,4-cyclohexanedimethanol Disclosed is a process for the preparation of high molecular weight polyesters by reacting one or more dicarboxylic acids directly with 1,4-cyclohexanedimethanol and, optionally, one or more diols. The process uses an overall diol to dicarboxylic acid molar ratio of... | 05/01/2007 |
| 7204962 | Production apparatus for polybutylene terephthalate Polybutylene terephthalate having good heat stability and excellent hydrolysis resistance is continuously produced in a series of a first reactor for reacting an aromatic dicarboxylic acid comprising terephthalic acid as a main ingredient or a derivative thereof wit... | 04/17/2007 |
| 7189675 | Olefin polymerization catalyst on plasma-contacted support A method for preparing an olefin polymerization catalyst is disclosed. An inorganic oxide is contacted with plasma and a transition metal compound is supported on the contacted inorganic oxide. The method is fast, convenient, and avoids many of the problems associat... | 03/13/2007 |
| 7135544 | Living olefin polymerization processes Processes for the living polymerization of olefin monomers with terminal carbon-carbon double bonds are disclosed. The processes employ initiators that include a metal atom and a ligand having two group 15 atoms and a group 16 atom or three group 15 atoms. The ligan... | 11/14/2006 |
| 7132484 | Continuous process for producing poly (trimethylene terephthalate) A continuous process for the production of poly(trimethylene terephthalate) is disclosed. According to the process, a liquid feed mixture comprising bis-3-hydroxypropyl terephthalate and/or low molecular weight polyesters of 1,3-propanediol and terephthalic acid, th... | 11/07/2006 |
| 7034091 | Combinatorial synthesis and screening of non-biological polymers Methods and apparatus for the preparation and use of a substrate having an array of diverse materials in predefined regions thereon. A substrate having an array of diverse materials thereon is generally prepared by delivering components of materials to predefined re... | 04/25/2006 |
| 6998463 | Polyester resin and process for its production A polyester resin characterized in that the content of the copolymerized components other than the terephthalic acid component and the ethylene glycol component, is not more than 4 mol % based on the total discarboxylic acid component, and when polyester resin is fo... | 02/14/2006 |
| 6995232 | Synthesis of polyol medium fatty acid polyesters Processes for the preparation of polyol fatty acid polyesters comprise heating a mixture of polyol, fatty acid ester, emulsifying agent and catalyst. In one embodiment, the fatty acid chains of the fatty acid ester have from about 6 to about 14 total carbon atoms an... | 02/07/2006 |
| 6995216 | Process for manufacturing single-site polyolefins A dual olefin polymerization process is disclosed. The process uses a bridged indenoindolyl ligand-containing Group 4 transition metal complex and an activator. It is carried out in multiple stages or in multiple reactors. The same complex and the same activator are... | 02/07/2006 |
| 6982236 | Process to polymerize olefins This invention relates to a method to prepare a supported catalyst system comprising preparing a combination comprising 1) a first supported catalyst system comprising a support, an activator and a metal catalyst compound, and 2) a second supported catalyst system c... | 01/03/2006 |
| 6979752 | Continuous process for converting polytetramethylene ether diester to polytetramethylene ether glycol A continuous process for converting by transesterification the diester of polytetramethylene ether (PTMEA) to the corresponding polytetramethylene ether glycol (PTMEG). The process is characterized by the fact that the feed, consisting of PTMEA along with an alkanol... | 12/27/2005 |
| 6969746 | Process for the preparation of ethylene copolymers, and their use as additives to mineral oil and mineral oil distillates Process for the preparation of ethylene copolymers, and their use as additives to mineral oil and mineral oil distillates. The invention relates to a process for the preparation of terpolymers of ethylene and at least 2 further olefinically unsaturated compou... | 11/29/2005 |
| 6914104 | Process for polymerization of α-olefin The object of the present invention is to provide a polyolefin polymerization method which prevents fine particles of polymer from scattering from a fluidized bed in a gas phase polymerization reactor. This object is achieved by a process for polymerization of α-ol... | 07/05/2005 |
| 6887953 | Esterification process A process that can be used for direct esterification of a dicarboxylic acid such as terephthalic acid with a glycol such as 1,3-propanediol. The process comprises (1) contacting, at an elevated temperature, optionally in the presence of a preformed oligomer, the aci... | 05/03/2005 |
| 6875826 | High melt strength polypropylene The present invention concerns a high melt strength propylene polymer or copolymer suitable for manufacturing foams and thermoformed product exhibiting a melt strength of at least 3 g and comprising a high molar mass portion and a low or medium molar mass portion. T... | 04/05/2005 |
| 6800718 | Process for producing polytrimethylene terephthalate (PTT) Process of producing polytrimethylene terephthalate (PTT) by esterification of terephthalic acid (TPA) with trimethylene glycol (TMG) in the presence of a catalytic, titanium compound, precondensation and polycondensation. The esterification is effected in at least ... | 10/05/2004 |
| 6762253 | Process for the preparation of ethylene copolymers, and their use as additives to mineral oil and mineral oil distillates The invention relates to a process for the preparation of terpolymers of ethylene and at least 2 further olefinically unsaturated compounds by polymerization in a tubular reactor fitted with at least one side branch, wherein the fresh monomer components, which are i... | 07/13/2004 |
| 6762254 | Ethylene(meth)acrylate copolymers with low residual content in comonomers Copolymers of ethylene have from 1 to 30 mol % of alkyl(meth)acrylates and, if desired, other comonomers, and have a residual comonomer content of less than 0.5% by weight in the copolymer. A process for preparing copolymers of this type in a combination of stirred ... | 07/13/2004 |
| 6670443 | Method for the production of olefin/carbon monoxide copolymers A process for preparing linear, alternating carbon monoxide copolymers, in which at least one olefinically unsaturated compound having from two to twenty carbon atoms (component K1) and carbon monoxide are copolymerized in the presence of a) metal com... | 12/30/2003 |
| 6632907 | Process for producing methacrylic polymer The present invention relates to a process for the production of methacrylic polymers which comprises the steps of, in one perfect mixing type reactor, effecting continuous bulk polymerization at a polymerization temperature of 110 to 160° C. by using a ... | 10/14/2003 |
| 6610797 | Method for producing ethylene copolymers in segmented tubular reactors and utilizing copolymers as a flow improver In a process for preparing ethylene-vinyl acetate copolymers in which a mixture of ethylene and vinyl acetate is polymerized continuously in the presence of free-radical polymerization initiators and, if desired, molecular weight regulators in a cooled tu... | 08/26/2003 |
| 6610806 | Living olefin polymerization processes Processes for the living polymerization of olefin monomers with terminal carbon-carbon double bonds are disclosed. The processes employ initiators that include a metal atom and a ligand having two group 15 atoms and a group 16 atom or three group 15 atoms... | 08/26/2003 |
| 6592913 | Crosslinked branched polyesters A gum base comprising a crosslinked branched polyester gel prepared from the process comprising: a) providing a first pre-gel composition having carboxyl end groups; b) providing a second pre-gel composition having hydroxyl end groups; c) removing either ... | 07/15/2003 |
| 6590069 | Methods of post-polymerization extruder injection in condensation polymer production The invention is a novel method for the late introduction of additives into condensation polymers. The method employs a reactive carrier that functions as a delivery vehicle for one or more additives. The reactive carrier reacts with the condensation poly... | 07/08/2003 |
| 6573343 | Multistep process for preparing polyolefins having high melt strength Olefin polymers are prepared in a plurality of polymerization stages, optionally in a plurality of polymerization reactors, in the presence of hydrogen and an olefin polymerization multisite catalyst, preferably a dualsite catalyst, having at least cataly... | 06/03/2003 |
| 6573359 | Methods of post-polymerization injection in condensation polymer production The invention is a novel method for the late introduction of additives into a process for making condensation polymers. The method employs a reactive carrier that functions as a delivery vehicle for one or more additives. The reactive carrier reacts with ... | 06/03/2003 |
| 6566486 | Method of producing branched polyamides A process for the production of polyamides is disclosed. In a first reaction step, suitable monomers such as caprolactam or an aliphatic aminocarboxylic acid are reacted with polyfunctional amines, which contain at least one secondary amino group, and/or ... | 05/20/2003 |
| 6534094 | Manufacturing process of microcapsules for sustained release of water soluble peptides A process for the manufacturing of microcapsules for sustained release of water soluble peptides, with adjustable release periods of between 1 to 18 weeks. The microcapsule wall are made of a biodegradable polymer. The process is based on the formation of... | 03/18/2003 |
| 6509424 | Process for the preparation of ethylene copolymers, and their use as additives to mineral oil and mineral oil distillates The invention relates to a process for the preparation of terpolymers of ethylene and at least 2 further olefinically unsaturated compounds by polymerization in a tubular reactor fitted with at least one side branch, wherein the fresh monomer components, ... | 01/21/2003 |
| 6469129 | Process for crosslinked branched polyesters A process for making a crosslinked branched polyester gel from at least two pregel compositions comprising: a) reacting precursor repeat units formed from (1) at least one polyol having three or more hydroxyl groups or esters thereof, (2) at least one ali... | 10/22/2002 |
| 6458896 | Superabsorbent powders of high absorption and high capillary suction Certain mixtures of two superabsorbent powders having very different capillary suctions exhibit a resulting capillary suction which approaches the higher value. The resulting mixtures simultaneously exhibit a high capillary suction and a high intrinsic ab... | 10/01/2002 |
| 6395870 | Process for preparing biodegradable polymers having repeating succinyl units A process for preparing biodegradable polymers having repeating succinyl units, characterized in that an optionally substituted 1,4-butanedicarboxylic acid, or a 1,4-butanedicarboxylic acid derivative is reacted with an acid anhydride.... | 05/28/2002 |
| 6391984 | Polymerization process A staged method of forming vinyl (e.g. acrylate) copolymer by solution polymerization which involves a) charging up to 90% of at least two vinyl monomers of the vinyl copolymer to a first stage reaction zone, b) polymerizing the at least two vinyl monomer... | 05/21/2002 |
| 6384153 | Process optimization of peroxide injection during polyethylene production In a process for the high-pressure polymerization of ethylene in a high-pressure autoclave or in a high-pressure tube reactor having one or more metering points for one or more peroxides, no peroxide or a reduced amount of peroxide is metered in during th... | 05/07/2002 |
| 6369158 | Dibenzyltrithiocarbonate molecular weight regulator for emulsion polymerization Mercaptans are normally used as chain transfer agents in emulsion polymerizations. The mercaptans used in commercial applications are typically complex mixtures of hundreds of similar compounds having boiling points within a narrow range. The chain transf... | 04/09/2002 |
| 6362305 | Method for producing formaldehyde from methanol In a process for preparing formaldehyde from methanol by dehydrogenation in a reactor in the presence of a catalyst at a temperature in the range from 300 to 1000° C., a circulating gas stream comprising by-products of the dehydrogenation is passed throu... | 03/26/2002 |
| 6335411 | Ethylene polymer and processes for obtaining it Ethylene polymer having a blow-up ratio (RB) of at least 1.4, a resistance to crazing under stress (ESCR) of at least 55 h and a melt index (MI5) of at least 0.2 g/10 min. Processes for obtaining this ethylene polymer using different... | 01/01/2002 |
