| Entries |
| Document | Title | Date |
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| 20080242830 | Lower-color polytrimethylene ether glycol using hydride compounds - The present invention relates to a process for preparing lower-color polytrimethylene ether glycol, comprising contacting said polytrimethylene ether glycol, or its precursor reaction-mixture, with a hydride compound during at least one stage of the process of manufacture, or on the polytrimethylene ether glycol resulting form such process, such that the polytrimethylene ether glycol demonstrates a reduced color (as compared to using no hydride compound). | 10-02-2008 |
| 20080275208 | POLYHYDROXYALKANOATE BIOPOLYMER COMPOSITIONS - Several novel PHA polymer compositions produced using biological systems include monomers such as 3-hydroxybutyrate, 3-hydroxypropionate, 2-hydroxybutyrate, 3-hydroxyvalerate, 4-hydroxybutyrate, 4-hydroxyvalerate and 5-hydroxyvalerate. These PHA compositions can readily be extended to incorporate additional monomers including, for example, 3-hydroxyhexanoate, 4-hydroxyhexanoate, 6-hydroxyhexanoate or other longer chain 3-hydroxyacids containing seven or more carbons. This can be accomplished by taking natural PHA producers and mutating through chemical or transposon mutagenesis to delete or inactivate genes encoding undesirable activities. Alternatively, the strains can be genetically engineered to express only those enzymes required for the production of the desired polymer composition. Methods for genetically engineering PHA producing microbes are widely known in the art (Huisman and Madison, 1998, Microbiology and Molecular Biology Reviews, 63: 21-53). These polymers have a variety of uses in medical, industrial and other commercial areas. | 11-06-2008 |
| 20080275209 | POLY(CARBONATE-CO-UREA) COPOLYMERS AND MELT TRANSESTERIFICATION METHOD OF PREPARING THESE COPOLYMERS - Disclosed herein is a process to prepare a poly(carbonate-co-urea) copolymer comprising reacting in the melt: (a) a dihydroxy reaction component comprising a dihydroxy compound, (b) a diaryl carbonate reaction component comprising a diaryl carbonate, (c) a urea reaction component comprising a urea compound in the presence of (d) a transesterification catalyst during at least part of the reaction and removing a phenolic byproduct to produce a poly(carbonate-co-urea) copolymer, wherein the urea and dihydroxy compounds are reacted in a molar ratio: (total moles of urea compound)/((total moles of urea compound)+(total moles of dihydroxy compound)) of less than or equal to 0.5. | 11-06-2008 |
| 20090221785 | PRODUCTION OF NON-SOLID-STATED POLYESTER PARTICLES HAVING SOLID-STATED PROPERTIES - A process for producing non-solid-stated polyester polymer particles having one or more properties similar to polyester polymer particles that have undergone solid-state processing. | 09-03-2009 |
| 20100041856 | ENZYME-CATALYZED POLYCARBONATE AND POLYCARBONATE ESTER SYNTHESIS - An enzymatic process for preparing aliphatic polycarbonates via terpolymerization or transesterification using a dialkyl carbonate, an aliphatic diester, and an aliphatic diol or triol reactant. A catalyst having an enzyme capable of catalyzing an ester hydrolysis reaction in an aqueous environment is subsequently added to the reaction mixture. Next, polymerization of the reaction proceeds for an allotted time at a temperature≦100° C. Finally, the copolymer is isolated from an the catalyst via filtration. | 02-18-2010 |
| 20120178896 | BIODEGRADABLE POLYESTER - The present invention relates to a substantially gel-free and substantially linear biodegradable polyester obtainable by means of reaction with radical initiators starting from a precursor polyester provided with an unsaturated chain terminator, said terminator having the formula: | 07-12-2012 |
| 20120184706 | METHOD FOR SYNTHESIZING POLYESTERS IN AN ACIDIC IONIC LIQUID MEDIUM - The present invention relates to a method for synthesizing polyesters or copolyesters having a mean molar mass in mass M | 07-19-2012 |
| 20130030143 | METHOD FOR MANUFACTURING LIQUID CRYSTAL POLYESTER AND LIQUID CRYSTAL POLYESTER - A method for manufacturing a liquid crystal polyester, comprising: a melt polycondensation step in which 0.001 to 1% by mass of a heterocyclic aromatic compound represented by the following formula (I) is added to a monomer mixture comprising at least one monomer selected from the group consisting of terephthalic acid, a terephthalic acid derivative, 2,6-naphthalenedicarboxylic acid and a 2,6-naphthalenedicarboxylic acid derivative, relative to 100% by mass of the monomer mixture, and then a melt polycondensation is conducted at a temperature of 240 to 300° C. so as to obtain a polymer. | 01-31-2013 |
| 20130184429 | FUNCTIONAL BIODEGRADABLE POLYMERS - Biodegradable polyesters are made by synthesizing copolymers derived from biodegradable hydroxyacid monomers as well as from hydroxyacid monomers containing a functional group such as an azide group, a halogen group, a thioacetate group, and the like. Preferably, the functionalized biodegradable polyester copolymers are derived from a functionalized hydroxyacid such as a homolog of lactic acid and/or glycolic acid with the copolyester thus containing functional groups on the backbone thereof. These biodegradable polyesters can be utilized wherever biodegradable polyesters are currently used, and also serve as a polymer to which various medical and drug delivery systems can be attached. | 07-18-2013 |
| 20130237682 | METHOD FOR PREPARING STAR POLYMERS - The invention relates to a method for preparing linear polymers having an amide end or having a star architecture comprising an amide core, by means of a ring opening using lactide and glycolide monomers or a lactide monomer ring in the presence of a catalyst, wherein the method includes the steps of: (i) reacting the excess monomer(s) with an initiator in a solvent, said initiator being selected from among an amine and an amino alcohol, given that the initiator has at least one primary or secondary amine function; (ii) adding a catalyst, said catalyst being a non-nucleophilic base and including at least one neutral sp2 nitrogen atom; and (iii) neutralizing the reaction mixture. Said novel method is particularly advantageous in that it can be easily monitored and enables better modulation of the polymers, and thus of the properties thereof, than the methods of the prior art. The invention also relates to novel polymers that are obtainable by means of said method. | 09-12-2013 |
| 20140100350 | SOLID-PHASE POLYMERIZATION METHOD FOR PREPARING HIGH-MOLECULAR-WEIGHT ALIPHATIC POLYESTER - A solid-phase polymerization method of high-molecular-weight aliphatic polyester conducts the solid-phase polymerization of aliphatic polyester prepolymer under a gas stream containing sulfonic acid catalyst. The method features preparing metal free aliphatic polyester with high molecular weight, good color and luster and perfect thermal stability efficiently. The non-metal-ion aliphatic polyester is not only applicable to common use, but is also suitable as high value-added medical material and packing material which contacts with food directly than other metal-containing polyester. | 04-10-2014 |
| 20140121347 | HIGH MOLECULAR WEIGHT POLYLACTIC ACID SYNTHESIZED VIA POLYCONDENSATION CATALYZED BY BIONIC CREATININE GUANIDININIUM CHLORIDE - Disclosed is a high molecular weight polylactic acid synthesized by using a method for synthesizing and catalytically-polycondensing bionic creatinine-guanidinium chloride. Creatinine is used as the material in a reaction with aqueous hydrochloric acid to synthesize a bionic creatinine-guanidinium salt catalyst, creatinine-guanidinium chloride (CR.Cl). The creatinine-guanidinium chloride synthesized is used as a catalyst, an industrial grade lactic acid (LA, 85% to 90%, aqueous solution) is used as a monomer, a solvent-free two-step polycondensation method is used to synthesize and afford metal-free and toxic residue-free polylactic acid featuring high biological safety and high molecular weight. | 05-01-2014 |
| 20140163194 | METHOD FOR PRODUCING POLYMER - To provide a method for producing a polymer, which contains: bringing a compressive fluid and a ring-opening polymerizable monomer into contact with each other, followed by adding a catalyst thereto, to thereby allow the ring-opening polymerizable monomer to carry out ring-opening polymerization. | 06-12-2014 |
| 20140275467 | Polylactone Polymers Prepared from Monol and Diol Polymerization Initiators Processing Two or More Carboxylic Acid Groups - The present invention is directed to a novel polymerization process for making novel absorbable, linear polylactone polymers prepared using novel polymerization initiators to achieve rates of mechanical property loss or of absorption of articles made from the polymers that are at least about 1.2 times faster than the rates of mechanical property loss of polymers made by similar processes utilizing conventional initiators. The novel polymerization initiators include monols or diols possessing at least one primary alcohol group and two or more carboxylic acid groups. The invention also is directed to absorbable polylactone polymers prepared by processes of the present invention and to medical devices made from such polymers. | 09-18-2014 |
| 20140350209 | METHOD FOR PRODUCING POLYMER AND POLYMER PRODUCT - A method for producing a polymer, including: (i) bringing a compressive fluid and raw materials containing a ring-opening polymerizable monomer into contact with each other at a mixing ratio represented by the following formula, to thereby allow the ring-opening polymerizable monomer to carry out ring-opening polymerization in the presence of a metal catalyst: 1{Mass of the raw materials/(Mass of the raw materials+Mass of the compressive fluid)} | 11-27-2014 |
| 20140371420 | POLYMER PARTICLE AND METHOD FOR PRODUCING THE SAME - A method for producing polymer particles, including (A) polymerizing and granulating a ring-opening polymerizable monomer in a compressive fluid with a catalyst in the presence of a surfactant, or (B) polymerizing and granulating an addition polymerizable monomer in a compressive fluid in the presence of a silicone surfactant. | 12-18-2014 |
| 20150011724 | METHOD FOR PRODUCING POLYMER - A method for producing a polymer, including: (i) bringing a compressive fluid and raw materials containing a ring-opening polymerizable monomer into contact with each other at a mixing ratio represented by the following formula, to thereby allow the ring-opening polymerizable monomer to carry out ring-opening polymerization: 1>{Mass of the raw materials/(Mass of the raw materials+Mass of the compressive fluid)}≧0.5. | 01-08-2015 |
| 20150126703 | CATALYZED POLYMERIZATION OF CYCLIC ESTERS AND CYCLIC CARBONATES - A process for the preparation of polyesters or polycarbonates including (i) the provision of cyclic esters or cyclic carbonates, (ii) polymerizing by ring-opening in the presence of a betaine based metal-free catalyst showing formula | 05-07-2015 |
| 20190144603 | THERMOSETTING RESIN COMPOSITION | 05-16-2019 |
