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| Number | Title | Issue Date |
| 7919649 | Plasticiser esters Esters produced by the catalyzed reaction of alcohols and acids or anhydrides are neutralized by treatment with an aqueous alkaline alkali metal salt solution in an amount that provides less than a stoichiometric amount of alkali metal salt in relation to the acidit... | 04/05/2011 |
| 7306738 | Method of deionizing solution yielded by polyester decomposition with ethylene glycol There is provided a method for deionizing a decomposition produced solution resulting from decomposition of a polyester by ethylene glycol. The ester interchange reaction and hydrolysis reaction along with cation removing treatment of a decomposition product resulti... | 12/11/2007 |
| 7300966 | Method for producing blends of phthalic acid diesters, decanols and tridecanols A process is described for preparing mixtures of diesters of phthalic acid with decanols and tridecanols by reacting phthalic acid or a reactive derivative of phthalic acid with a mixture made from at least one decanol and at least one tridecanol. Mixtures ob... | 11/27/2007 |
| 7267803 | Degassing apparatus A degassing apparatus for use with a polymerisation reactor is disclosed. Slurry from the reactor is discharged into a flask tank (3) in which monomers or dilluent vaporise to form a gas. Filler units (9, 10) are provided at the upper part of the flash... | 09/11/2007 |
| 7247742 | Recycling polyethylene naphthalate containing materials in a process to produce diesters A process for preparing a dialkylester of a naphthalenedicarboxylic acid comprising directing a liquid phase reaction mixture comprising a low molecular weight alcohol, a naphthalenedicarboxylic acid, a dialkylester of a naphthalenedicarboxylic acid, and a polyethyl... | 07/24/2007 |
| 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 |
| 7211193 | Processes for the purification of bis(2-hydroxyethyl)terephthalate A method is disclosed for efficiently obtaining BHET of high purity from an EG (ethylene glycol) solution containing crude BHET (bis(2-hydroxyethyl)terephthalate), especially a decomposition product solution obtained by decomposing a polyester containing PET (polyet... | 05/01/2007 |
| 7202283 | Method for dissolving saturated polyester solution for decomposing saturated polyester and method for decomposition using the same The present invention provides a dissolution method for saturated polyester capable of recycling saturated polyester used in fibers, a film, a bottle and others with ease and a low cost, a solution decomposing saturated polyester and a decomposition method using the... | 04/10/2007 |
| 7135588 | Method of producing dimethyl phthalate from naphthalene based chemicals The present invention results to an improved and environment friendly method of producing dimethyl phthalate of about 99% purity from naphthalene based chemicals, said method comprising steps of mixing phthalic anhydride with methanol in the ratio ranging between 2:... | 11/14/2006 |
| 7122083 | Apparatus and process used in growing crystals This invention relates to a novel system for making uniform crystals. The system, by virtue of the nature of its crystal product, is useful in various chemical, pharmaceutical, agricultural, and biotechnology applications. The invention features physically separated... | 10/17/2006 |
| 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 |
| 7064834 | Method for analyzing impurities in carbon dioxide This invention relates to methods and systems for detecting contaminants that can precipitate and deposit on a workpiece during a carbon dioxide application, especially contaminants that are already present and dissolved in the fresh carbon dioxide fed to the applic... | 06/20/2006 |
| 7030264 | Bis-β-hydroxyethyl terephthalate Bis-β-hydroxyethyl terephthalate having an optical density measured in a 10 wt % methanol solution at a measurement wavelength of 380 nm and a cell optical path length of 10 mm of 0.000 to 0.006. The present invention makes it clear that purified BHET having an opt... | 04/18/2006 |
| 7015267 | Polyethylene terephthalate compositions A method for increasing the crystallization rate of a polyethylene terepthalate (PET) prepared based on terepthalic acid (TPA) and ethylene glycol monomers, by adding into said TPA-based PET an effective amount of a polyethylene terepthalate prepared based on dimeth... | 03/21/2006 |
| 6939980 | Process for producing ester A method for producing an ester comprising the steps of reacting an alcohol with a carboxylic acid to obtain a crude esterfied product, adding 5 to 100 parts by weight of a hydrocarbon solvent with respect to 100 parts by weight of the crude esterified product and p... | 09/06/2005 |
| 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 |
| 6720448 | Method of recovering chemical species by depolymerization of poly (ethylene terephthalate) and related use The present invention relates to a method of recovering a solution comprising the chemical species obtained by depolymerization of PET from a material containing poly(ethylene terephthalate) in the form of bottles, by making said material react, in the absence of wa... | 04/13/2004 |
| 6710202 | Process for production of high-purity bis-β-hydroxyethyl terephthalate To provide a process for producing a high-purity bis-β-hydroxyethyl terephthalate from crude terephthalic acid. A process for producing high-purity bis-β-hydroxyethyl terephthalate by carrying out the following steps (1) to (4) in the mentioned order: (1) t... | 03/23/2004 |
| 6706843 | Method for separating and recovering dimethyl terephthalate and ethylene glycol from polyester waste For separation and recovery of dimethyl terephthalate (DMT) and ethyiene glycol (EG) from polyester waste containing foreign materials, the polyester waste is treated in EG containing a polyester depolymerization catalyst, a solid foreign material fraction floated o... | 03/16/2004 |
| 6630601 | Methods for the preparation or purification of bis-ଲ-hydroxyethyl terephthalate An aromatic polyester is pre-decomposed by heating together with bis-ଲ-hydroxyethyl terephthalate and/or a low condensate thereof and then, reacted with ethylene glycol to convert the terephthalic acid component of the pre-decomposed product into bi... | 10/07/2003 |
| 6569901 | Alkynyl-substituted propionic acid derivatives, their preparation and use The present invention relates to compounds of formula (I) ##STR1## The compounds are useful in the treatment and/or prevention of conditions mediated by nuclear receptors, in particular the Peroxisome Proliferator-Activated Receptors (PPAR).... | 05/27/2003 |
| 6548695 | Process for producing isocoumarins and intermediates for the same Provided is a process for producing an isocoumarin-3-yl-acetic acid derivative, characterized by reacting a homophthalic acid derivative represented by a formula: ##STR1## (wherein Rc, R2 and R are mainly protecting groups) with a ... | 04/15/2003 |
| 6534677 | Non-crushable, non-friable, non-breakable carbon catalyst supports The present invention provides a carbon-containing catalyst support that includes at least a carbonaceous material nd a thermosetting or sinterable polymer. The components are mixed and the polymer sintered or thermoset to provide a non-crushable, non-fri... | 03/18/2003 |
| 6509507 | Polymerizable biaryls, process for their preparation and their use A process for preparing polymerizable biaryl derivatives comprises reacting an aromatic comprising a 6-membered ring which bears ester or benzylic OH groups in the 1,4 position with a second aromatic in a palladium-catalyzed cross-coupling reaction to giv... | 01/21/2003 |
| 6472557 | Process for recycling polyesters A process for producing high quality TPA suitable for PET feedstock material from recycled polyester. The process includes the steps of depolymerizing the polyester to form DMT; separating the DMT from secondary materials; and hydrolyzing the DMT to form ... | 10/29/2002 |
| 6369263 | Process for producing hydroquinone diester derivative A hydroquinone diester derivative represented by the formula (1): ##STR1## wherein R1 and R2 are the same or different, each representing an alkyl group, a cycloalkyl group, an aryl group, or a heterocyclic group is crystallized from a re... | 04/09/2002 |
| 6310235 | Method for producing ester plasticizers The invention relates to an improved method for producing ester plasticizers by reacting di- or polycarboxylic acids or their anhydrides with alcohols in the presence of metal catalysts.... | 10/30/2001 |
| 6262294 | Process for continuously producing monomer components from aromatic polyester This invention relates to a process for producing aromatic divalent carboxylic acid ester and diatomic alcohol by reacting aromatic polyester and super critical monatomic alcohol, and by the process, PET is decomposed for recovering monomer components the... | 07/17/2001 |
| 6211398 | Process for the preparation of dialkyl esters of naphthalenedicarboxylic acids Disclosed is a process for the production and purification of dialkyl naphthalenedicarboxylate compounds wherein a crude naphthalenediacarboxylic acid is esterified with an alkanol such as methanol to produce a crude esterification product comprising dial... | 04/03/2001 |
| 6180817 | Process for the distillation of crude ester in the DMT/PTA process A process for preparing crude dimethyl terephthalate, comprises oxidizing a mixture comprising para-xylene and methyl para-toluate, esterifying the oxidized mixture with methanol, separating the resulting crude ester into fractions. By separating the crud... | 01/30/2001 |
| 6150552 | Efficient methods for making tetrahalophthalate esters having excellent purity Provided are methods for the preparation and purification of alkyl tetrahalophthalate esters by the reaction of a tetrahalophthalic compound with an alkanol in the presence of a titanate catalyst. More particularly, improved methods are provided for makin... | 11/21/2000 |
| 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 |
| 6096171 | Process for the distillation of crude ester in the DMT/PTA process A process for purifying a crude ester containing dimethyl terephthalate, includes flash distilling a mixture including para-xylene and methyl para-toluate, and separating the crude ester into fractions. By separating the crude ester with a distillation co... | 08/01/2000 |
| 6013831 | Processes for the production of high-purity dimethyl 2, 6-naphthalenedicarboxylate and naphthalenedicarboxylic acid A process for the production of high-purity dimethyl 2,6-naphthalenedicarboxylate, which comprises esterifying 2,6-naphthalenedicarboxylic acid obtained by liquid phase oxidation of 2,6-dialkylnaphthalene with molecular oxygen in the presence of an o... | 01/11/2000 |
| 5952520 | Recovery of ester monomer from polyester resins There is described a process for improving the yield of diester monomer recovered from the depolymerization of polyethylene terephthalate by converting a mixture of dimethyl terephthalate and methylhydroxyethyl terephthalate to predominantly dimethyl tere... | 09/14/1999 |
| 5948934 | Process for recycling polyester obtained from orto, meta and para bencendicarboxilic acids A process is disclosed for recycling of polyester used in the fabrication of molded plastic goods, such as films, carbonated beverage bottles and particularly waste poly(ethylene terephthalate) (PET) bottle grade, manufacturing residues and other manufact... | 09/07/1999 |
| 5880310 | Process for producing plasticizer esters Provided is a process for producing a plasticizer ester characterized by previously removing dissolved oxygen in a starting alcohol, and then subjecting an organic acid or its anhydride and the alcohol to an esterification reaction in the presence of an o... | 03/09/1999 |
| 5852201 | Process for the distillation of crude ester in the DMT/PTA process A process for preparing crude dimethyl terephthalate, comprises oxidizing a mixture comprising para-xylene and methyl para-toluate, esterifying the oxidized mixture with methanol, separating the resulting crude ester into fractions. By separating the crud... | 12/22/1998 |
| 5821381 | Low pressure process for purifying crude polyester by sublimation There is described a process for depolymerizing polyesters such as polyethylene terephthalate polyester to monomer components comprising esters such as dimethyl terephthalate and purifying the ester by sublimation, which purified ester can then be used to... | 10/13/1998 |
| 5728323 | Process for preparing dialkyl tetrahalophthalates A process for the preparation of dialkyl tetrahalophthalates. A tetrahalophthalic anhydride or acid is dissolved in excess C1 -C18 alkanols. Residual sulfuric acid is removed by treatment with magnesium acetate or multiple water wash... | 03/17/1998 |
