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| Number | Title | Issue Date |
| 5763686 | Method for preparing 1,1,1-tris(4-hydroxyphenyl)ethane 1,1,1-Tris(4-hydroxyphenyl)ethane, a branching agent for polycarbonates, is prepared by the reaction of phenol with 2,4-pentanedione in the presence of sulfuric acid and at least one mercapto sulfonic acid such as 3-mercaptopropanesulfonic acid as promote... | 06/09/1998 |
| 5759406 | Adsorption process for organic base recovery from aqueous brine solutions An adsorption process uses a non-ion-exchangeable adsorbent polymeric resin of a monoethylenically unsaturated monomer such as styrene and a polyvinylidene monomer such as divinylbenzene for the adsorption of organic bases, such amines, amine salts and gu... | 06/02/1998 |
| 5756801 | Method of purifying diphenyl carbonate-phenol adduct Adducts of hydroxyaromatic compounds such as phenol and diaryl carbonates such as diphenyl carbonate are washed with a washing composition comprising a major proportion, typically about 90%, of the hydroxyaromatic compound and a minor proportion, typicall... | 05/26/1998 |
| 5756859 | Method for preparing and purifying 1,1,1-tris(4-hydroxyphenyl)ethane 1,1,1-Tris(4-hydroxyphenyl)ethane in admixture with bisphenol A is obtained by the reaction of 2,4-pentanedione with excess phenol under acidic conditions and in the presence of a mercapto compound as promoter. The products may be separated by extracting ... | 05/26/1998 |
| 5726856 | Hexasubstituted guanidinium salts and ultracapacitors employing them as electrolytes Ultracapacitors including at least one cell with two solid, non-porous current collectors, two porous electrodes, preferably of carbon, and a porous separator between the electrodes, employ as electrolytes materials comprising at least one hexasubstituted... | 03/10/1998 |
| 5723689 | Process for recovering bisphenols A method for recovering substantially pure p,p-bisarylols from a mixture comprising the same by subjecting the mixture to vacuum distillation and melt crystallization in the absence of an adduct crystallization and the generation of a reaction recycle str... | 03/03/1998 |
| 5721280 | Method for depolymerizing polyimides and recovering reagents therefrom Polyimides, especially thermoset polyimides such as those prepared by the reaction of p-phenylenediamine with 4,4'-hexafluoroisopropylidenebis(phthalic anhydride) and nadic ester, are converted to monomers which may be recycled for polyimide synthesis by ... | 02/24/1998 |
| 5717056 | Method for preparing polycarbonate by solid state polymerization Solid state polycarbonate formation comprises an initial step of converting a precursor polycarbonate to an enhanced crystallinity precursor polycarbonate and a second step of polymerizing said enhanced crystallinity precursor polycarbonate in the solid s... | 02/10/1998 |
| 5712325 | Method for making radiation curable silicon containing polyacrylate hardcoat A method is provided for making a radiation curable silicon containing polyacrylate hardcoat composition based on the use of a dispersion of colloidal silica in a C(3-5) branched aliphatic alcohol such as isopropyl alcohol. A reduction in the use of exces... | 01/27/1998 |
| 5710475 | Insulation of high thermal conductivity and apparatus containing same Metallic conductors of electricity, such as stator bars in turbine generators, are coated with an insulating composition comprising a high temperature-resistant thermoplastic resin, such as a polyimide or polyethersulfone, having uniformly dispersed there... | 01/20/1998 |
| 5710238 | Process for preparing branched polycarbonates by solid state polymerization This invention involves a novel process for preparing branched polycarbonates employing a solid state polycondensation process; specifically, subjecting a linear crystallized oligomer derived from dihydroxydiaryl compound and a diaryl carbonate to solid s... | 01/20/1998 |
| 5710086 | Titanate catalysts Reaction mixtures prepared from tetraalkyl titanates and mixtures of glycols, said reaction mixtures comprising titanium bisglycoxide oligomers, may be used as depolymerization catalysts for conversion of linear polyesters to macrocyclic polyester oligome... | 01/20/1998 |
| 5707439 | Layered minerals and compositions comprising the same Novel silicate minerals that have undergone a cation exhange with at least one heteroaromatic cation comprising a positively charged organo-substituted heteroatom and/or at least one positively charged heteroatom not part of an aromatic ring with at least... | 01/13/1998 |
| 5705696 | Extractive method for the preparation of quaternary salts Quaternary (e.g., tetraalkylammonium and tetraalkylphosphonium) salts containing non-halide anions are prepared by performing an anion exchange reaction by liquid-liquid extraction with a chlorinated solvent of a mixture of an aqueous solution an alkali m... | 01/06/1998 |
| 5693742 | Solventless method for making polyarylene ethers A method for making polyarylene ethers comprises the step of melt polymerizing phenolic monomers in the presence of oxygen and oxidative coupling catalysts without employing environmentally unfriendly solvents.... | 12/02/1997 |
| 5693700 | Flame retardant polymer compositions A metal borate, metal phosphate or metal borophosphate in combination with either a metal sulfide or sulfur polysiloxanes are incorporated into polymer systems to produce a polymer composition which unexpectedly displays flame retardant properties without... | 12/02/1997 |
| 5691411 | High performance polymer compositions High performance polymer compositions comprising orthoester or orthocarbonate functionalized olefin polymers and polyphenylene ethers, polyamides or combinations thereof, and the compositions unexpectedly display improved impact resistances and/or decreas... | 11/25/1997 |
| 5691019 | Foul release system A coated article for foul release for use in aquatic applications does not require a discrete tie-layer to ensure adhesion of a coating to a substrate. An adhesion promoting layer comprising an anticorrosive material and a bonding agent is applied directl... | 11/25/1997 |
| 5688837 | Method of improving adhesion of polyurethane foam to polycarbonate and articles made thereby A method improves the adhesion of polyurethane foam to polycarbonate by providing reactive groups on the polycarbonate surface. The adhesion is further improved by utilizing a polyurethane mix with an isocyanate index greater than 82. Articles comprising ... | 11/18/1997 |
| 5688888 | Peralkylated phosphazene base-catalyzed silanol condensation method Organopolysiloxane oils and gums are produced by the condensation of silanol-terminated organosiloxane in the presence of an effective amount of a peralkylated phosphazene base as a catalyst and at reduced pressure.... | 11/18/1997 |
| 5685506 | Insect abatement system An insect abatement system prevents adhesion of insect debris to surfaces which must be kept substantially free of insect debris. An article is coated with an insect abatement coating comprising polyorganosiloxane with a Shore A hardness of less than 50 a... | 11/11/1997 |
| 5683062 | Aircraft anti-insect system Insect debris is removed from or prevented from adhering to insect impingement areas of an aircraft, particularly on an inlet cowl of an engine, by heating the area to 180°-500° C. An apparatus comprising a means to bring hot air from the aircraft engin... | 11/04/1997 |
| 5672776 | Method for purifying 1,1,1-tris(4-hydroxyphenyl)-alkanes Tris(4-hydroxyphenyl)alkanes such as 1,1,1 -tris(4-hydroxyphenyl)ethane are purified by formation of an adduct with a molar excess of a C1-4 primary alkyl tertiary amine, preferably triethylamine. Adduct formation is preferably effected in a po... | 09/30/1997 |
| 5672085 | Methods of making an improved x-ray tube cathode cup assembly An improved method of making a high performance x-ray system having cathode cup assembly which reduces tube manufacturing costs and failures due to filament misalignment during the manufacturing process is available.... | 09/30/1997 |
| 5668186 | Process for depolymerizing polyesters The invention relates to a novel process for depolymerizing polyesters by subjecting the polyesters to catalysts and organic solvents which are substantially free of oxygen and water in order to produce macrocyclic polyester oligomers substantially free o... | 09/16/1997 |
| 5663275 | Preparation of polyether polymers using bisphenol hydrate as intermediate Aromatic polyether polymers, illustrated by polyethersulfones, polyetherketones and polyetherimides, are prepared by a phase transfer catalyzed reaction between a hydrate of a salt of a dihydroxyaromatic compound and a substituted aromatic compound such a... | 09/02/1997 |
| 5663282 | Method for producing polyesters A method for preparing rapidly crystallized polyesters from macrocyclic polyester oligomers comprising the step of contacting macrocyclic polyester oligomers, polymerization catalysts and nucleating agents.... | 09/02/1997 |
| 5661214 | Titanate esters useful as polymerization initiators for macrocylic polyester oligomers Macrocyclic polyester oligomer compositions are polymerized to high molecular weight polyesters by heating with a titanate ester composition comprising moieties having oxygen or nitrogen chelated with a titanium atom or having two titanium atom connected ... | 08/26/1997 |
| 5659006 | Method for making polyarylene ethers from mesitol A method for making polyarylene ethers comprising the step of melt polymerizing 2,6-disubstituted-4-alkylphenols in the presence of an oxidative coupling catalyst and in the absence of environmentally unfriendly solvents.... | 08/19/1997 |
| 5656061 | Methods of close-coupled atomization of metals utilizing non-axisymmetric fluid flow Close-coupled atomization methods employing non-axisymmetric fluid flow geometries have demonstrated superior efficiency in the production of fine superalloy powder, such as, for example, nickel base superalloys compared to conventional close-coupled atom... | 08/12/1997 |
| 5652017 | Method for rendering inorganic powder hydrophobic Inorganic powder, preferably fumed silica, is rendered hydrophobic by treatment with a silylating agent in the presence of a third reagent selected from the group consisting of protonic acids, especially those having a boiling point at atmospheric pressur... | 07/29/1997 |
| 5652312 | Redistribution of organic polyestercarbonate compositions Polyestercarbonates, particularly those containing aliphatic dicarboxylic acid-derived structural units, are redistributed by heating in the presence of a carbonate redistribution catalyst, and, optionally, a diaryl carbonate. The redistribution products ... | 07/29/1997 |
| 5650470 | Polycarbonate redistribution using diethyldimethylammonium hydroxide as catalyst Polycarbonate compositions are redistributed by melt equilibration using diethyldimethylammonium hydroxide as the redistribution catalyst. This catalyst affords an odorless polycarbonate product having a very low residual amine level.... | 07/22/1997 |
| 5650031 | Extruding thermoplastic insulation on stator bars An apparatus and a method provide for the extruding of thermoplastic insulation onto complex shapes, such as generator stator bars. The method of the present invention comprises the steps of feeding the complex shape through a central bore of an extrusion... | 07/22/1997 |
| 5649430 | Insulating foam of low thermal conductivity and method of preparation Insulating foam for refrigerators and the like is prepared by blowing in the presence of carbon dioxide as the sole or principal blowing agent. The thermal conductivity of the foam is decreased by sealing said foam in a gas-impervious enclosure with at le... | 07/22/1997 |
| 5648454 | Process for producing high ductile polyesters A process for making high ductile and high melting point polyesters comprising the step of contacting macrocyclic copolyester oligomers having structural units with C4 alkylene bridging radicals and structural units with bridging radicals other... | 07/15/1997 |
| 5643637 | Method of grading the electric field of an electrode A method is described for grading the electrical field at the surface of an electrode by depositing a semiconductive coating thereon. An electrode substrate is powered at a preselected temperature and power. A mixture of gases is then passed through an el... | 07/01/1997 |
| 5640767 | Method for making a double-wall airfoil A method for making double-wall airfoil for applications such as the blades and vanes of gas turbine engines by depositing an airfoil skin over an inner support wall which is separately formed and contains channels filled by a channel filling means. The c... | 06/24/1997 |
| 5636545 | Composite diamond wire die A composite diamond wire die for drawing wire has a single crystal or HTHP diamond substrate and a CVD layer or layers deposited thereon. A wire die bore extends through the substrate and between the CVD layers, with a wire bearing surface being located c... | 06/10/1997 |
| 5636181 | Ultrasonic/vibration detection using polarization beating in a microchip laser An ultrasound/vibration sensor consisting of a microchip laser or an array of microchip lasers constructed to oscillate at two different laser frequencies corresponding to two orthogonal polarizations is disclosed. The frequency difference between these t... | 06/03/1997 |
