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...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 7935737 | Articles derived from compositions containing modified polybutylene terephthalate (PBT) random copolymers derived from polyethylene terephthalate (PET) Compositions of matter including articles derived from (a) from 5 to 99.99 wt % of a modified polybutylene terephthalate random copolymer that (1) is derived from polyethylene terephthalate and (2) contains a at least one residue derived from polyethylene terephthal... | 05/03/2011 |
| 7902264 | Polytrimethylene terephthalate (PTT) derived from polyethylene terephthalate (PET) and containing PET residues A composition comprising a polytrimethylene terephthalate random copolymer that (1) is derived from polyethylene terephthalate component selected from the group consisting of polyethylene terephthalate and polyethylene terephthalate copolymers and (2) contains at le... | 03/08/2011 |
| 7897651 | Method for depolymerizing polyester and unsaturated polyester, and method for recovering polyester monomer using the depolymerization A method for rapidly depolymerizing a polyester and an unsaturated polyester by irradiating the polyester with microwaves in the presence of an alkylene glycol in which a titanium oxide fine powder having a bulk density of not more than 0.3 g/cm3 has been... | 03/01/2011 |
| 7893122 | Chemical process for recycling polyethylene terephthalate (PET) waste The present invention relates to a process for chemical recycling of PET waste that comprises, among other stages, a saponification reaction stage, wherein PET waste particles are reacted with stoichiometric or excessive amounts of a strong base metal in an alcoholi... | 02/22/2011 |
| 7339017 | Acryl-modified polyester resin composition and method of preparing the same A condensation polymerization of apolyhydric alcohol and a polybasic acid in a solvent is performed to give a polyester resin. The polyester resin and an unsaturated polybasic acid are polymerized to give a polyester resin intermediate of following formula (1) havin... | 03/04/2008 |
| 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 |
| 7297721 | Process for controlled polymerization of a mixed polymer The present invention provides a process for the preparation of high molecular weight crystalline Polyethyleneterephthalate (PET) using up to 50% of Post consumer recycled PET flakes along with Pure Terephthalic Acid (PTA), Isophthalic Acid (IPA) and Mono Ethylene G... | 11/20/2007 |
| 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 |
| 7241854 | Thermoplastic polyurethanes Thermoplastic polyurethanes are obtainable by reacting (a) isocyanates with (b1) polyesterdiols having a melting point greater than 150° C., (b2) polyetherdiols and/or polyesterdiols, each having a melting point of less than 150° C. and a molecular weight of from ... | 07/10/2007 |
| 7214723 | Method for the decontamination of polyethylene terephthalate A process for removing contaminants from PET components by mixing ethanediol with the PET feedstock at a temperature about the boiling point of ethanediol and for a time sufficient to convert the polyethylene terephthate components to polyethylene terephthate polyme... | 05/08/2007 |
| 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 |
| 7192988 | Process for recycling polyester materials The present invention is a process for recycling colored polyester. More specifically, colored polyester for recycling is depolymerized by the addition of glycol to form the monomer BHET. The BHET is contacted with activated carbon to remove some colorant. The remai... | 03/20/2007 |
| 7188436 | Heating and drying apparatus for particulate material A continuous gravity flow apparatus for heating and/or drying of particulate material is vertically disposed and is provided with an inlet at the top and an outlet at the bottom. The apparatus includes a flow passage for the particulate material which is defined bet... | 03/13/2007 |
| 7179869 | Process for producing polyester resins In the invention, a polyester resin having dicarboxylic acid constitutional units and diol constitutional units wherein 5 to 60 mol % of the diol constitutional units has a cyclic acetal skeleton is produced by a process including an oligomerization step and a polym... | 02/20/2007 |
| 7138435 | Method of decomposing thermosetting resin, apparatus and heat control program A method of decomposing a thermosetting resin by a decomposer comprising the steps of: pre-heating the thermosetting resin up to a pre-heating temperature T0; kneading the pre-heated thermosetting resin together with a decomposer, and concurrently heating a m... | 11/21/2006 |
| 7129278 | Aqueous polymer dispersions The overall performance of water-reducible polymer dispersions, more specifically alkyd dispersions, can be substantially improved by utilizing resins derived from acidolysis reaction products of polyalkylene terephthalates and polyalkylene naphthalates. According t... | 10/31/2006 |
| 7098299 | Separation of contaminants from polyester materials The present invention is generally directed to a process for separating and recovering post-consumer polyester from various contaminant materials. The invention can be utilized to separate post-consumer polyester from various contaminants including glass, dirt, pape... | 08/29/2006 |
| 7033167 | Device for purifying and/or decontaminating polyester The invention relates to an apparatus for cleaning and/or decontaminating polyester, in particular polyethylene terephthalate (PET). The apparatus has an at least partially heated rotary tubular furnace to be fed with a mixture of polyester and an alkaline material ... | 04/25/2006 |
| 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 |
| 7014970 | Resin composition A resin composition having a softening point of from 80° to 165° C., obtained by reacting a poly C2-4 alkylene terephthalate having a melting point of 200° C. or more with a low-molecular weight polyester having a number-average molecular weight of fro... | 03/21/2006 |
| 6962438 | Temperature sensor temperature sensing tube A temperature sensor temperature sensing tube comprised of a head section having an outer conoidal hem formed along the circumference at its lower extent, a neck section formed at the center, a passage disposed in the neck section, and a tube member having a hollow ... | 11/08/2005 |
| 6919383 | CO2-assisted deploymerization, purification and recycling of step-growth polymers A method of depolymerizing a polymer comprises contacting a polymer with a fluid comprising carbon dioxide and at least one component, wherein the fluid plasticizes the polymer and facilitates penetration of the component into the polymer to depolymerize the polymer... | 07/19/2005 |
| 6887909 | Processes for producing aqueous alkyd resin dispersions The present invention provides production processes of aqueous alkyd resin dispersions, said processes comprising a step of synthesizing alkyd resin by dissolving polyester resin whose chief component is terephthalic acid and which has been recovered from waste mate... | 05/03/2005 |
| 6884558 | Resin composition A resin composition having a softening point of from 80° to 165° C., obtained by reacting a poly C2-4 alkylene terephthalate having a melting point of 200° C. or more with a low-molecular weight polyester having a number-average molecular weight of fro... | 04/26/2005 |
| 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 |
| 6833094 | Dimensionally stable parts having good torsional stability and compositions and methods for making same Compositions, apparatus and methods of the present invention concern the manufacturing parts that remain strong and dimensionally stable after exposure to e-coat painting conditions. Such manufacturing includes providing a molding compound having about 55-65% by wei... | 12/21/2004 |
| 6803389 | Process for producing polyester resin This invention discloses a process for producing a polyester resin, which is transparent, substantially free of occurrence of foreign matters or filtration residue, and is subject to no problem in physical properties, within short time, by concurrently reacting poly... | 10/12/2004 |
| 6780894 | Treatment liquid for cured unsaturated polyester resin and treatment method thereof The present invention provides a decomposition treatment liquid for a cured unsaturated polyester resin, comprising a phosphoric acid-type compound or salt thereof and an organic solvent as essential components. By using the treatment liquid of the invention, a cure... | 08/24/2004 |
| 6777048 | Polyester compositions containing silicon carbide A polyester pellet composition, a preform, and a bottle, each comprising a polyester polymer and silicon carbide. A polyester, and in particular a polyethylene terephthalate polyester, bottle containing silicon carbide has a low coefficient of static friction and a ... | 08/17/2004 |
| 6770680 | Method for recycling pet components and device for carrying out said method A process for the recycling of PET flakes from comminuted PET bottles, wherein the flakes are subjected to a washing treatment, are treated for at least 20 minutes in at least one washer at an elevated temperature higher than 70° C. with a cleaning solution which c... | 08/03/2004 |
| 6750260 | Process for chemical recycling of polyurethane-containing scrap A process of chemically recycling polyurethane-containing scrap. Polyurethane-containing scrap is subjected to a chemolysis reaction to produce chemolysis polyol products. The chemolysis polyol products are used as initiators in a reaction with alkylene oxide to pro... | 06/15/2004 |
| 6730709 | Biodegradable recycled polyester resin and production process therefor The present invention provides a biodegradable recycled polyester resin and a production process therefor, wherein the polyester resin is inexpensive and economical due to use of recycled aromatic polyesters, and further, can solve problems of wastes by affording bi... | 05/04/2004 |
| 6689821 | Chemical method of removing paint film on plastic resin using isopropyl alcohol Thermosetting paint film is removed by adding plastic resin coated with thermosetting paint film into a mixed solution of an alcoholic solvent and alkali and heating this mixed solution while stirring. Isopropyl alcohol, phenoxy alcohol and alkali are add... | 02/10/2004 |
| 6642350 | Method of purifying bishydroxyalkyl terephthalate A container made of, e.g., polyethylene terephthalate is pulverized and decomposed in the presence of a catalyst by the use of a solvent such as an alcohol or glycol to obtain crude bishydroxyalkyl terephthalate. This crude bishydroxyalkyl terephthalate i... | 11/04/2003 |
| 6576774 | Process for recycling polytrimethylene terephthalate cyclic dimer This invention is an improvement upon the known process for polymerization of polytrimethylene terephthalate by esterification of terephthalic acid or dimethyl terephthalate with 1,3-propane diol, precondensation of the esterification product to produce a... | 06/10/2003 |
| 6573304 | Method for obtaining polyols and polyol thus obtained The invention relates to the field of polymer chemistry. It features a method for obtaining polyols consisting in a first step in reacting glycols, i.e. plurialcohols with a functionality at least equal to two (MEG,DEG,DPG, . . . ) on polyethyleneterephth... | 06/03/2003 |
| 6545061 | Recycling of polyethylene terephthalate with regeneration of acetic acid Disclosed herein is a process for depolymerizing and purifying recyclable PET comprising the steps of: (a) conducting acetolysis on recyclable PET to form terephthalic acid and ethylene glycol diacetate; (b) reacting the terephthalic acid with methanol to form... | 04/08/2003 |
| 6518322 | Conversion of contaminated polyethylene terephthalate to decontaminated polybutylene terephthalate Decontaminated crushed polyethylene terephthalate is converted to decontaminated PBT withtout requiring a catalyst by mixing with 1,4-butanediol under reduced pressure, transeterifying at 120-190° C., distilling off ethanediol and tetrahydrofuran under s... | 02/11/2003 |
| 6512046 | Polymerizable unsaturated polyester resin composition A practical polymerizable unsaturated polyester resin composition is provided, wherein a polyester skeleton derived from collected PET is introduced, for effective utilization of waste PET such as a PET bottle which has recently been considered a large ob... | 01/28/2003 |
