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| Number | Title | Issue Date |
| 8163869 | Purification method of carboxyl group-containing polyoxyethylene derivative An object of the present invention is to provide a purification method of separating impurities from a carboxyl group-containing polyoxyethylene derivative having a molecular weight of 2,000 to 100,000. The purification method according to the invention inclu... | 04/24/2012 |
| 7402264 | Sensing/actuating materials made from carbon nanotube polymer composites and methods for making same An electroactive sensing or actuating material comprises a composite made from a polymer with polarizable moieties and an effective amount of carbon nanotubes incorporated in the polymer for a predetermined electomechanical operation of the composite when such compo... | 07/22/2008 |
| 7342088 | Method for precipitation of polyphenylene ether Method for precipitating polyphenylene ether which decreases fine particles therein and reduces periodic fluctuations in particle size. Method provides homogeneous polyphenylene ether particles. Polyphenylene ether particles are precipitated using mixed solution com... | 03/11/2008 |
| 7259231 | Extraction and fractionation of biopolymers and resins from plant materials A method for the extraction, separation, fractionation and purification of biopolymers from plant materials using supercritical and/or subcritical solvent extractions is disclosed. Specifically, the process can be used for the separation of resins and rubber from gu... | 08/21/2007 |
| 7255798 | Recycling of used perfluorosulfonic acid membranes A method for recovering and recycling catalyst coated fuel cell membranes includes dissolving the used membranes in water and solvent, heating the dissolved membranes under pressure and separating the components. Active membranes are produced from the recycled mater... | 08/14/2007 |
| 7223471 | Polytrimethylene terephthalate resins with improved properties A composition comprising Polytrimethylene terephthalate (PTT) with a reduced emission of acrolein is obtained by contacting Polytrimethylene terephthalate (PTT) resin with an effective amount of a melt stable, organic stabilizing compound. Such PTT resin has an acro... | 05/29/2007 |
| 7148296 | Capped poly(arylene ether) composition and process A thermoset composition exhibiting reduced water absorption in the cured state includes an olefinically unsaturated monomer and a capped poly(arylene ether) prepared by the reaction of an uncapped poly(arylene ether) with an anhydride capping agent. The capped poly(... | 12/12/2006 |
| 7138485 | Method for removing metal ions from polymers or polymer solutions The invention relates to a simple, economical and reliable method for removing catalytic residues from polymer solutions. According to the inventive method, the copper content is reduced to a non-disturbing concentration level. ... | 11/21/2006 |
| 7112652 | Solvents useful in the preparation of polymers containing hydrophilic and hydrophobic monomers This invention relates to solvents which may be used to extract polymers that are made of hydrophilic and hydrophobic monomers. ... | 09/26/2006 |
| 7078440 | Dimethyl terephthalate composition and process for producing the same A dimethyl terephthalate composition includes 0.001 to 200 ppm of methyl 4-(1,3-dioxolan-2-yl)benzoate and 0 to 1 ppm of dimethyl hydroxyterephthalate contained in dimethyl terephthalate, and exhibits improved properties as a material for producing polyester. ... | 07/18/2006 |
| 7049394 | Method for preparing free flow resin The present invention provides a method for producing a free flowing and/or non clumping resin that includes prior to drying, shrinking the resin under agitation. In one variant of the invention, the is a resin used in solid phase synthesis of peptides. In another a... | 05/23/2006 |
| 6939943 | Method for deactivating and recovering boron trifluoride when producing polyisobutenes The invention relates to a method for deactivating and recovering boron trifluoride when producing polyisobutenes by means of cationic polymerization of isobutene or hydrocarbon streams containing isobutene in the liquid phase in the presence of boron trifluoride or... | 09/06/2005 |
| 6894145 | Methods to purify polymers The present invention discloses methods to remove impurities in polymeric materials in order to improve the opto-electronic characteristics of devices fabricated from these polymers. The polymers include but not limited to polyarylenes, polyarylenevinylenes, polyary... | 05/17/2005 |
| 6867322 | Ester-forming monomer An ester-forming monomer obtained by depolymerization of polytrimethylene terephthalate and having an acrolein content of no greater than 0.5 wt %. Polymers obtained using the monomer and fibers, films and molded articles comprising the polymers. The ester-forming m... | 03/15/2005 |
| 6787611 | Purification means Polymers derived from 4-acyloxystyrene are purified by fractionalization plus heating and cooling of the polymers in alcoholic solvents. ... | 09/07/2004 |
| 6765083 | Solvents useful in the preparation of polymers containing hydrophilic and hydrophobic monomers This invention relates to solvents which may be used to extract polymers that are made of hydrophilic and hydrophobic monomers. ... | 07/20/2004 |
| 6759507 | Process for producing polyphenylene ether At the time of preparing polyphenylene ether resin, there can be separated and recovered efficiently an aromatic compound solvent, amines making an azeotrope with water (hereafter, referred to as ‘the amines’ for short.) and methanol. A method for produci... | 07/06/2004 |
| 6627727 | Method of precipitating polyphenylene ether Polyphenylene ether particles which contain fine powder in a small amount and are easy to handle at the time of molding, are obtained. A method for precipitating polyphenylene ether, which comprises adding a non-solvent for polyphenylene ether to a solution of... | 09/30/2003 |
| 6599969 | Preparation of polyolefins with low extractables contents A process for preparing stabilized olefin polymers which have a low cold heptane extractables content by polymerization of olefins with Ziegler or Phillips catalysts, wherein the polymer is, immediately after leaving the polymerization reactor, brought in... | 07/29/2003 |
| 6593451 | Method of processing polyacrylonitrile The present invention involves a method of processing polyacrylonitrile into a predetermined form. The first step in this method includes preparing a solution of a room temperature solvent that will dissolve polyacrylonitrile at room temperature and, a ro... | 07/15/2003 |
| 6593431 | Purification means Polymers derived from 4-acyloxystyrene are purified by fractionalization plus heating and cooling of the polymers in alcoholic solvents.... | 07/15/2003 |
| 6580015 | Absorbent composition including an uncrosslinked polymer An absorbent composition comprising an uncrosslinked, high molecular weight polymer, wherein the uncrosslinked, high molecular weight polymer is treated by a means to effectively insolubilize the uncrosslinked, relatively high molecular weight polymer suc... | 06/17/2003 |
| 6514438 | Pulse extraction of ocular medical devices A method of extracting residual materials from a polymeric, ophthalmic biomedical device, such as a contact lens, by using a mixture comprised of a primary solvent, such as carbon dioxide, and a polar co-solvent, such as isopropanol. By exposing the devic... | 02/04/2003 |
| 6489373 | Method for decomposition and recovery of polyurethane resin The present invention provides a method of recovering a polyamine compound and/or a polyol compound useful for starting materials of polyurethane resin in an industrially advantageous manner by first dissolving the polyurethane resin such as polyurethane ... | 12/03/2002 |
| 6465609 | Process for removal of metal catalyst from polymer selectively hydrogenated using organotitanium compound The present invention provides an effective process for removal of the residual metal catalyst from a polymer solution using water and alcohol containing an inorganic acid after selective hydrogenation of the unsaturated olefinic double bonds in a polymer... | 10/15/2002 |
| 6437084 | Method of preparing a poly (arylene ether) and a poly (arylene ether) prepared thereby A method of preparing a poly(arylene ether) includes oxidatively coupling a monohydric phenol in a reaction solution at a reaction temperature that exceeds the cloud point temperature of the reaction solution. The oxidative coupling occurs in the presence... | 08/20/2002 |
| 6423821 | Method for producing poly(p-t-butoxystyrene) A method for producing poly(p-t-butoxystyrene), which comprises polymerizing p-t-butoxystyrene in a hydrocarbon type reaction solvent in the presence of a polymerization initiator, and, after termination of the polymerization reaction, conducting a separa... | 07/23/2002 |
| 6369293 | Absorbent composition including an uncrosslinked polymer An absorbent composition comprising an uncrosslinked, high molecular weight polymer, wherein the uncrosslinked, high molecular weight polymer is treated by a means to effectively insolubilize the uncrosslinked, relatively high molecular weight polymer suc... | 04/09/2002 |
| 6359110 | Quick-set film-forming compositions The present invention relates to a quick set composition and a method for preparing the composition. The composition comprises an aqueous sol of a polymer having a backbone that contains pendant cationic groups and pendant acid groups. The sol is prepared... | 03/19/2002 |
| 6323305 | Process for preparing polyethylene naphthalate based polymers by using NDCA or its derivates The present invention provides a process for preparing polyethylene naphthalate polymers comprising: esterifying a slurry comprising NDCA or a dicarboxylic acid containing NDCA or derivatives thereof, and ethylene glycol or a glycol containing ethylene gl... | 11/27/2001 |
| 6300467 | Production of polytetrahydrofuran with terminal hydroxyl groups by changing the continuous and dispersed phase The present invention relates to a process for preparing hydroxyl-containing polymers, in particular for preparing polytetrahydrofuran with terminal hydroxyl groups, from the corresponding acyloxy-containing polymers by transesterification with alcohols i... | 10/09/2001 |
| 6191177 | Depolymerization apparatus for recycling polyesters An apparatus for depolymerizing recycled polyester into its component ester monomers and half esters includes a first reactor for depolymerizing the recycled polyester, a separator for separating ester monomeric components and half-esters from secondary m... | 02/20/2001 |
| 6166156 | Method for making photocurable halofluorinated acrylates Halofluorinated alkylene monomers are made by a method comprising the steps of: (a) subjecting a first polymer which is the reaction product of a fluorinated vinyl monomer and a vinyl comonomer to dehydrohalogenation to form a second polymer; (b) treating... | 12/26/2000 |
| 6160086 | Process for removing impurities from polymers A continuous, preferably counter-current, extraction process that can be used to significantly reduce the concentrations of residual monomers, residual catalyst, undesired solvents, and other impurities in polymer compositions. The invention is particular... | 12/12/2000 |
| 6136869 | Depolymerization process for recycling polyesters A process for recovering suitable polyester feedstock material from recycled polyester includes the steps of depolymerizing the polyester into its component ester monomers and half-esters; separating the monomers and half-esters from other secondary mater... | 10/24/2000 |
| 6133329 | Aromatic polyester polyols made from a natural oil Methods of making aromatic polyester polyols that are suitable for use with hydrocarbon and hydrofluorocarbon blowing agents. The polyols are made by reacting polyethylene terephthalate, dissolved in a solution comprising a plurality of glycols, with a na... | 10/17/2000 |
| 6083283 | Method for removing color from ionically dyeable polymeric materials A method for removing color and extracting dyes from ionically dyeable polymeric materials is provided. The method includes contacting the ionically dyeable polymeric material with a swelling agent for the material under conditions sufficient to effect di... | 07/04/2000 |
| 6068789 | Method of cleaning or purifying elastomers and elastomeric articles which are intended for medical or pharmaceutical use A method of cleaning or purifying elastomers and elastomeric articles which are intended for medical or pharmaceutical use is disclosed. In particular, although not exclusively, the invention has applicability to elastomers which are used in metering valv... | 05/30/2000 |
| 6036726 | Process for separating polyamide from colorant A process for recycling colored polyamide material comprises the steps of (a) contacting solid colored polyamide material with an organic solvent composition at a temperature effective to dissolve the polyamide, thereby forming a solution containing color... | 03/14/2000 |
| 6015609 | Process for manufacture of a porous polymer from a mixture The present invention is directed to a process for the production of a porous polymer comprising the steps of: i) forming a mixture comprising a polymerizable component and an organic solvent wherein the polymerizable component comprises at least one macr... | 01/18/2000 |
