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| Number | Title | Issue Date |
| 7915374 | Copolyesters having improved thermal stability and methods for making them Processes for producing polyethylene terephthalate copolyesters are disclosed, that include the steps of: esterifying a mixture of at least terephthalic acid, from 20 mole percent to 45 mole percent 1,4-cyclohexanedimethanol, and e... | 03/29/2011 |
| 7087704 | Method for manufacturing thermotropic liquid-crystalline polymer It is an object of the present invention to manufacture high quality thermotropic liquid-crystalline polymer generating no low boiling gas and inducing no discoloration resulted from thermal degradation at high yield. To manufacture a liquid-crystalline polymer havi... | 08/08/2006 |
| 7063892 | Aromatic liquid-crystalline polyester and film thereof An aromatic liquid-crystalline polyester having a small dielectric loss in a wide frequency region is provided. An aromatic liquid-crystalline polyester is provided that can manufacture a film having a small volume expansion by heating. An aromatic liquid-crystallin... | 06/20/2006 |
| 7041773 | Polyimide sulfones, method and articles made therefrom Polyimide sulfone resins are provided with a glass transition temperature of from 200–350° C., residual volatile species concentration of less than 500 ppm and a total reactive end group concentration of less than about 120 milliequivalents/kilogram resin. The re... | 05/09/2006 |
| 6984712 | Liquid-crystal polyester resin The present invention provides a liquid-crystalline polyester resin which comprises monomer units derived from 2-hydroxy-3-naphthoic acid and/or 2-hydroxynaphthalene-3,6-dicarboxylic acid in an amount of 1-5000 mmol % based on the total monomer components of the res... | 01/10/2006 |
| 6596839 | Wholly aromatic polyester and production process therefor A process for producing a wholly aromatic polyester which is excellent in heat resistance, mechanical properties and yet color and has a high degree of polymerization by melt polymerizing a dicarboxylic acid and a diol directly on an industrial scale at a... | 07/22/2003 |
| 6524566 | Synthetic soil-extract materials and medicaments for herpes viruses based thereon Phenolic polymers are prepared by oxidizing and polymerizing starting organic compounds comprising at least one hydroxyl group and at least one carbonyl group or at least two hydroxyl groups on an aromatic structure. One or more inorganic compounds or sal... | 02/25/2003 |
| 6482915 | Method for producing liquid crystalline polymer The invention provides a method for producing a thermotropic liquid crystalline polymer of high quality at high yield and in short polymerization time, which method includes polymerizing staring monomers I, II, III, and IV, i.e., (I) an aromatic hydroxyca... | 11/19/2002 |
| 6420511 | Process for the preparation of aromatic polyesters This invention relates to a process for the preparation of aromatic polyesters which comprises polymerization of a aromatic dicarboxylic acid substituted with a polar group weight percentage in the range of 20 to 75 with a substituted aromatic diol weight... | 07/16/2002 |
| 6419851 | Melt processible liquid crystalline terpolyesters and process for the preparation thereof Melt processable liquid crystalline terpolyesters of the formula I below: ##STR1## where R is Cl, C6 H5, CH3 CO, CH3, and process for the preparation thereof are disclosed. The process comprises acetylating 8(3-... | 07/16/2002 |
| 6392005 | Manufacturing method for decreasing the cyclic oligomer content in polyester The present invention relates to a manufacturing method for decreasing the cyclic oligomer content in polyester which effectively restrains the production of the cyclic oligomer in ester chips and further decreases the amount of regenerated cyclic oligome... | 05/21/2002 |
| 6291122 | Polyesters A branched polyester resin of the Formula ##STR1## wherein n and m represent randomly repeating segments, and the number of n and m segments in the polymer backbone are each of from about 10 to about 10,000; X is an alkylene group, an olefinic group, or a... | 09/18/2001 |
| 6242558 | Modified polytrimethylene terephthalate A 1,3-propanediol-based aromatic polyester such as polytrimethylene terephthalate is modified by reaction with a hindered phenolic acid or ester to provide an endcapped polyester which has improved resistance to generation of acrolein when heated in air.... | 06/05/2001 |
| 6235868 | Porphyrinogenic resin systems and polymers derived therefrom Polymerisable resins which comprise a porphyrinogenic ring system obtained by the reaction of: (a) one or more compounds selected from the group consisting of pyrrole and N-(lower)alkyl pyrroles, any of which may be optionally substituted, and (b) a C4 | 05/22/2001 |
| 6180747 | Polyesters A branched polyester resin of the Formula ##STR1## wherein n and m represent randomly repeating segments, and the number of n and m segments in the polymer backbone are each of from about 10 to about 10,000; X is an alkylene group, an olefinic group, or a... | 01/30/2001 |
| 6129982 | Aromatic polyimide film having improved adhesion In a heat-resistant aromatic polyimide/metal (or metal oxide) composite sheet composed of an aromatic polyimide film and a metal or metal oxide layer arranged on the film, the polyimide film is composed of an aromatic polyimide resin and an Al-containing ... | 10/10/2000 |
| 6063464 | Isosorbide containing polyesters and methods for making same A polyester polymer and method for making the polyester, wherein the polyester is prepared by (1) combining in a reactor a monomer containing a diacid moiety; a monomer comprising a diol moiety; and a monomer containing an isosorbide moiety; with a conden... | 05/16/2000 |
| 5945446 | Process for preparing synthetic soil-extract materials and medicaments based thereon Phenolic polymers are prepared by dissolving one or more organic phenols along with sodium periodate in aqueous base at pH 8-11, and allowing the mixtures to stand between 35 and 80° C. for a period of 30 minutes to 100 hours. One or more inorganic compo... | 08/31/1999 |
| 5807962 | Aromatic sulfonated diester monomer, process to synthesize, polymer derived therefrom and method to prepare said polymer A sulfonated dicarboxylic acid and a diaromatic carbonate are reacted by a solution process to form a sulfonated aromatic diester such as diphenyl sodium 5-sulfoisophthalate. The sulfonated aromatic diester is reacted with an aromatic polymer precursor mi... | 09/15/1998 |
| 5744575 | Aromatic polyimide and gas separation An aromatic polyimide having a recurring unit of the formula (I): ##STR1## wherein Ar is a divalent aromatic group having one or two benzene rings which has a sulfonate group of --SO3 H, --SO3 M, and --SO3 N(L)4 | 04/28/1998 |
| 5726279 | Preparation of poly-o-hydroxyamides and poly o-mercaptoamides In a process for the preparation of poly-o-hydroxyamides and poly-o-mercaptoamides, a bis-o-aminophenol or a bis-o-aminothiophenol is reacted with a dicarboxylic acid derivative of the following structure: ##STR1## with D=O, S, or NH and where R* is ... | 03/10/1998 |
| 5714567 | Process for the preparation of aromatic polyesters An improved process for the preparation of aromatic polyesters, whereby dialkyl esters of aromatic dicarboxylic acids are melt-polymerized with aromatic bisphenol to furnish an amorphous poly(arylester) prepolymer. The amorphous poly(arylester) prepolymer... | 02/03/1998 |
| 5696222 | Process for the production of polycarbonate A process for the production of a terminal-blocked aromatic polycarbonate by melt-polycondensing an aromatic dihydroxy compound and diphenylcarbonate, the process comprising adding a specific carbonate or carboxylic ester after a polycarbonate formed has ... | 12/09/1997 |
| 5677416 | Flame-retardant wholly aromatic polyester and method for preparing the same There are disclosed a wholly aromatic polyester represented by formula I with enhanced flame retardance and chemical stability, and a method for the preparing the same. The polymer is prepared in interface polymerization wherein an alkali aqueous phase co... | 10/14/1997 |
| 5674968 | Aromatic sulfonated diester monomer, process to synthesize, polymer derived therefrom and method to prepare said polymer A sulfonated dicarboxylic acid and a diaromatic carbonate are reacted by a solution process to form a sulfonated aromatic diester such as dipbenyl sodium 5-sulfoisophthalate. The sulfonated aromatic diester is reacted with an aromatic polymer precursor mi... | 10/07/1997 |
| 5665855 | Polymers and copolymers originating from the addition of oligomers containing diamino and dihydroxy ends and of bisoxazinones or bioxazolinones, and process for obtaining them Disclosed are polymers and copolymers containing at least one repeating unit of the formula ##STR1## in which X is O or NH; R is a single bond or a hydrocarbon chain; R' is a hydrocarbon chain containing one or two carbon atoms, and P is the residue ... | 09/09/1997 |
| 5606007 | Processes for preparing aromatic polycarbonates According to the present invention, there is provided an improvement which comprises adding an acid compound and if necessary an epoxy compound to a reaction product resulting from melt polycondensation reaction of an aromatic dihydroxy compound with a ca... | 02/25/1997 |
| 5567795 | Process for preparing hyperbranched polymers The present invention provides novel one-step processes for preparing highly branched macromolecule polymers that have highly controlled molecular architectures. The process comprise the reaction of a branching monomer such as a substituted phenyl compoun... | 10/22/1996 |
| 5561183 | Preparation method of antibacterial and deodorant polyester for fiber Antibacterial and deodorant polyester for fiber which is much improved in melt viscosity, is prepared by adding the melt viscosity enhancers represented by the following general formulas I to IV and compounding with zirconium phosphate: ##STR1##... | 10/01/1996 |
| 5554722 | Aromatic polyamide compositions with improved electrostatic properties, formed structures produced therefrom, and use and production thereof Aromatic polyamide compositions with improved electrostatic properties, formed structures produced therefrom, and use and production thereof. Described are compositions comprising an aromatic polyamide which is soluble in organic solvents and from 0.01 to 30% ... | 09/10/1996 |
| 5550205 | Copolycarbonates and manufacturing method for them To provide novel polycarbonates and a manufacturing method for them. Copolycarbonates obtained by copolymerizing at least two aromatic dihydroxy compounds and a compound capable of introducing carbonate links. Preferably, they contain, as the components derive... | 08/27/1996 |
| 5510450 | Method of producing copolymerized polycarbonates The object of the present invention is to provide a method of producing copolymerized polycarbonates having improved flow and formability, in addition to excellent mechanical properties, heat resistance, transparency, and color tone. A method of producing... | 04/23/1996 |
| 5506330 | Polymerization method for preparing non-halogenated aromatic The present invention relates to a polymerization method for preparing non-halogenated aromatic polyesters by a standard interfacial polymerization except the addition of a phase-transfer catalyst to the organic phase. More specifically, the present inven... | 04/09/1996 |
| 5443783 | Process for blow molding articles from liquid crystal polymers Disclosed is a process for blow molding articles from liquid crystal polymers containing ionic moieties in the backbone. The ionic moieties increase the melt viscosity of the polymers sufficiently high to blow mold articles therefrom. An illustrative liqu... | 08/22/1995 |
| 5418311 | Method for the synthesis of polymers, which have polyurethane and/or polyurea groups Polymers, which have polyurethane and/or polyurea groups and contain finely divided fillers, are synthesized by reacting compounds, which contain at least two hydroxyl and/or amino groups, with at least difunctional isocyanates, optionally in the presence... | 05/23/1995 |
| 5391690 | Process for producing (co)polycarbonate and (co)polycarbonate composition A process for producing a (co)polycarbonate or a (co)polyestercarbonate having a high molecular weight and excellent hue, heat stability and mechanical properties by reacting a dihydroxyl compound with a diester of carbonic acid and/or a diester of dicarb... | 02/21/1995 |
| 5384388 | Method of producing copolymerized polycarbonates [Purpose] The object of the present invention is to provide a method of product copolymerized polycarbonates having improved flow and formability, in addition to excellent mechanical properties, heat resistance, transparency, and color tone. [Constitution... | 01/24/1995 |
| 5350828 | Synthesis and polymerization of dithioether-linked phthalonitrile monomers Dithioether-linked phthalonitrile monomer are prepared by a substitution reaction between 4-nitrophthalonitrile and a dimercaptan and are polymerized to a high-temperature, oxidation-resistant polymer by heating them at a temperature above their melting p... | 09/27/1994 |
| 5340906 | Process for the preparation of polyester containing little deposited antimony particles as impurities Disclosed is a process for the preparation of polyester having an ethylene-terephthalate recurring-unit in the amount of not less than 60 molar % of the total recurring-unit of the polyester by polymerizing a bifunctional carboxylic acid comprising tereph... | 08/23/1994 |
| 5340908 | Process for the preparation of aromatic polyesters This invention relates to a process for the preparation of aromatic polyester(s) having an intrinsic viscosity greater than 0.4 dL/g in chloroform at 30° C. which comprises (a) reacting diarylesters of tere and isophthalic acid(s) and dihydric phenol(s) ... | 08/23/1994 |
