Treating At O Deg C (32 Deg F) Or Below, Or At 200 Deg C (392 Deg F) Or Above Patents (Class 528/481)
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Patent number: 5420239Abstract: Inhibition of popcorn polymer growth by treatment with heat. Heat can be applied to extant popcorn polymer, particularly in the absence of organic material from which the popcorn polymer is formed. A chemical inhibitor of popcorn polymerization can be used in conjunction with the heat treatment.Type: GrantFiled: August 30, 1994Date of Patent: May 30, 1995Assignee: Exxon Chemical Patents Inc.Inventors: Hsiang-ning Sun, Cynthia C. Ingram, John Jr. J. McManus
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Patent number: 5420166Abstract: The present invention is directed to a method for treating cross-linked (cured) filled or untilled unsaturated polyester for deriving an alcohol recycle reactant useful in the synthesis of alcohol-formed derivative products. The first step of the method is the attrition of the cured unsaturated polyester to form particulates thereof. In the next step of the process, at least a fraction of any filler or fiberglass in the cured unsaturated polyester is separated to form a cured unsaturated polyester regrind. The next step is the subjecting of the cured unsaturated polyester regrind to agitated, uncatalyzed or catalyzed glycolysis in the presence of excess glycol and, optionally, a transesterification catalyst under agitation at elevated transesterification temperature. The final step of the process is the recovery of the recycle alcohol reactant for use in the synthesis of alcohol-formed derivative products.Type: GrantFiled: September 30, 1994Date of Patent: May 30, 1995Assignee: Ashland Oil, Inc.Inventors: Timothy A. Tufts, Chung-Chieh Tsai, Stephen S. Hupp
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Patent number: 5418314Abstract: In a process for producing a polycarbonate by subjecting a dihydroxy compound and a diester of carbonic acid to melt polycondensation through transesterification, after a polycarbonate prepolymer is prepared in the first-stage reaction, polycondensation is conducted as the second-stage reaction at a residence time in the range of from 15 to less than 60 min or through the use of at least one paddle-type self-cleaning twin-screw extruder.This process enables a colorless, transparent polycarbonate having a high molecular weight to be produced at a high efficiency on an industrial scale.Type: GrantFiled: November 2, 1992Date of Patent: May 23, 1995Assignee: Daicel Chemical Industries, Ltd.Inventors: Tsutomu Yamamoto, Yasuhiro Oshino, Yutaka Fukuda, Tatsuya Kanno, Takaaki Kuwana
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Patent number: 5412063Abstract: Polyester prepolymer granules with open-ended cavities provide greatly improved solid state polymerization rates by improving reaction by-product diffusion characteristics.Type: GrantFiled: August 31, 1994Date of Patent: May 2, 1995Assignee: Shell Oil CompanyInventors: Ben Duh, William C. T. Tung
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Patent number: 5408035Abstract: This invention is a process for solid state polymerization of polyester using multiple reactors in series to achieve molecular weight increases, as measured by intrinsic viscosity, in excess of 0.25 dl/g with low levels of undesirable by-products.Type: GrantFiled: July 2, 1993Date of Patent: April 18, 1995Assignee: Shell Oil CompanyInventor: Ben Duh
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Patent number: 5407984Abstract: A process for producing macrocyclic polyester oligomers from polyester linears is described and the process comprises the steps of combining polyester linears and organic solvents having tin catalysts present therein.Type: GrantFiled: August 31, 1994Date of Patent: April 18, 1995Assignee: General Electric CompanyInventors: Daniel J. Brunelle, Tohru Takekoshi
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Patent number: 5401827Abstract: A semiconductive conjugated copolymer comprises at least two chemically different monomer units which, when existing in their individual homopolymer forms, have different semiconductor bandgaps. The proportion of said at least two chemically different monomer units in the copolymer is selected to control the semiconductor bandgap of the copolymer so as to control the optical properties of the copolymer. The copolymer is formed in a manner enabling it to be laid down as a film without substantially affecting the luminescent characteristics of the copolymer and is stable at operational temperature.The semiconductor bandgap may be spatially modulated so as to increase the quantum efficiency of the copolymer when excited to luminesce, to select the wavelength of radiation omitted during luminescence or to select the refractive index of the copolymer.Type: GrantFiled: August 22, 1991Date of Patent: March 28, 1995Assignee: Cambridge Display Technology LimitedInventors: Andrew Holmes, Donal D. Bradley, Richard H. Friend, Arno Kraft, Paul Burn, Adam Brown
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Patent number: 5395858Abstract: A process for recycling polyester contained in waste materials is provided. The polyester is converted into ethylene glycol and terephthalic acid. The process steps generally include first combining materials containing polyester with an alkaline solution to form a slurry. The slurry is heated, causing ethylene glycol to evaporate which can then be collected. The remaining product stream is then mixed with water and filtered to remove any undissolved impurities. The aqueous filtrate can be acidified causing terephthalic acid to precipitate. Further, if silver is contained within the materials fed to the process, the silver can also be isolated and recovered.Type: GrantFiled: April 28, 1994Date of Patent: March 7, 1995Assignee: Partek, Inc.Inventor: John A. Schwartz, Jr.
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Patent number: 5391710Abstract: Amine functional polymers are purified to remove formate present by contact with a supported Group VIII metal hydrogen transfer catalyst under conditions favoring formate decomposition to carbon dioxide and hydrogen which are removed as gases. The preferred catalyst is palladium on carbon. Essentially salt-free poly(vinylamines) can be obtained by hydrolysis of polymers of N-vinylformamide in aqueous solution using ammonia or a volatile amine as a hydrolysis agent so that formate salts are the principal by-product of the hydrolysis which creates amine functionality in the polymer. Formate can then by removed by the catalytic decomposition described. Removal of carbon dioxide is enhanced by degassing the hydrolyzate prior to formate decomposition and by nitrogen purge of the polymer solution during the catalytic decomposition reaction.Type: GrantFiled: March 25, 1993Date of Patent: February 21, 1995Assignee: Air Products and Chemicals, Inc.Inventor: Michael E. Ford
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Patent number: 5391694Abstract: Polyester prepolymer granules with open-ended cavities provide greatly improved solid state polymerization rates by improving reaction by-product diffusion characteristics.Type: GrantFiled: October 15, 1993Date of Patent: February 21, 1995Assignee: Shell Oil CompanyInventors: Ben Duh, William C. T. Tung
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Patent number: 5380822Abstract: A polymer melt may be devolatilized to less than 500, preferably less than 150 ppm of residual volatile material by injecting into the melt an amount of water greater than the amount of residual volatile material in the melt, typically not more than about 10 weight % and passing the melt through a flash chamber devolatilizer at a pressure of 8 mm of Hg or less at a temperature of from 200.degree. to 350.degree. C.Type: GrantFiled: May 27, 1993Date of Patent: January 10, 1995Assignee: Novacor Chemicals (International) S.A.Inventor: John P. Skilbeck
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Patent number: 5378801Abstract: The invention relates to a continuous process for the preparation of resorbable polyesters.Type: GrantFiled: August 3, 1993Date of Patent: January 3, 1995Inventors: Dieter Reichert, Franz D. Klingler, Horst Schwall, Albert Christmann, Berthold Buchholz
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Patent number: 5378802Abstract: A method of removing ionic impurities from a resist component, comprising the steps of:(a) dissolving said resist component in a solvent;(b) contacting said resist component solution with a fibrous ion exchange resin for a sufficient amount of time to remove at least a portion of said ionic impurities onto said fibrous ion exchange resin; and(c) separating said fibrous ion exchange resin bearing said ionic impurities from said resist component solution.Type: GrantFiled: September 3, 1991Date of Patent: January 3, 1995Assignee: OCG Microelectronic Materials, Inc.Inventor: Kenji Honda
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Patent number: 5376734Abstract: A process for the production of polyester resins having an intrinsic viscosity higher than 0.57 dl/g from polyester resins having intrinsic viscosities of lower than 0.57 dl/g in which 1) a melt of the polyester resin having an intrinsic viscosity lower than 0.57 dl/g is mixed with a polyaddition additive containing at least two groups which react with the terminal OH and COOH groups of the resin, 2) the melted mixture is converted into solid particles which are subsequently crystallized at temperatures higher than the Tg of the polyester resin and lower than its melting point, and 3) the particles are heated at temperatures higher than 150.degree. C. but lower than the melting point of the resin to increase the intrinsic viscosity.Type: GrantFiled: June 11, 1993Date of Patent: December 27, 1994Assignee: M. & G. Ricerche S.p.A.Inventor: Hussain A. K. Al Ghatta
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Patent number: 5374709Abstract: A method for removing oligomers and non-polymeric impurities from poly(arylene sulfide) polymers and producing the polymers in easily recoverable granular form is provided in which a poly(arylene sulfide) polymer associated with oligomers and non-polymeric impurities is contacted with a solvent, water, and optionally, a base, at a sufficient temperature to substantially dissolve the polymer, oligomers and impurities; then the solution is cooled to a temperature at which the poly(arylene sulfide) precipitates while oligomers and impurities remain in solution, then the precipitated polymer is separated from the solution containing the oligomers and impurities. A polymer product produced by this method is also disclosed.Type: GrantFiled: October 23, 1992Date of Patent: December 20, 1994Assignee: Phillips Petroleum CompanyInventors: Earl Clark, Jr., Lacey E. Scoggins, Glenn F. Kile
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Patent number: 5369148Abstract: Continuous agglomeration of an absorbent resin powder is accomplished by a method which comprises introducing the absorbent resin powder into a cylindrical member having an open lower end by means of a current of air through a dispersing member disposed in the upper part of the cylindrical member and, at the same time, spraying minute droplets of an aqueous liquid downwardly through a nozzle disposed inside the dispersing member thereby establishing mutual parallel flow contact between the absorbent resin powder descending toward the lower part of the cylindrical member as dispersed with the current of air and the liquid droplets descending toward the lower part of the cylindrical member as diffused in the radial direction, and removing the produced agglomerate having a plurality of particles of the absorbent resin powder cohesively united through the medium of the liquid droplets via the lower part of the cylindrical member. An apparatus for working the method is also disclosed.Type: GrantFiled: December 26, 1991Date of Patent: November 29, 1994Assignee: Nippon Shokubai Co., Ltd.Inventors: Hitoshi Takahashi, Hiroyuki Kakita, Yoshio Irie, Teruaki Fujiwara, Kazumi Akihisa
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Patent number: 5362807Abstract: An acrylic molded product comprising an acrylic polymer coagulated material having excellent characteristics in impact resistance, optical properties, and hydrothermal resistance; an acrylic polymer coagulated material used for the preparation thereof; an composition comprising thereof; and a process for manufacture thereof; characterized by using an emulsion polymerization and a polymer with multiphase structured material comprising a hard phase and a soft phase and being freeze-coagulated.Type: GrantFiled: December 14, 1993Date of Patent: November 8, 1994Assignee: Kuraray Co., Ltd.Inventors: Kouichi Nogura, Kouichi Fujie, Chouji Suga, Naokiyo Inomata, Mitsuo Ootani
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Patent number: 5357014Abstract: There are disclosed a styrenic resin molding having a high crystallinity and excellent in heat resistance, solvent resistance and transparency, and a process for producing the same. Specifically the present invention provides an orientable or thermoformable non-oriented styrenic resin molding having a crystallinity of 25% or more, a spherulite radius of 10 .mu.m or less and a haze of 5% or less and comprising a styrenic polymer having a high degree of syndiotactic configuration; a process for producing the above non-oriented molding; a transparent styrenic-resin molding having a crystallinity of 30% or more which is obtained by thermoforming or orienting the above non-oriented molding at an expansion ratio by area of 1.2 or more; and the process for producing the same.Type: GrantFiled: August 3, 1992Date of Patent: October 18, 1994Assignee: Idemitsu Kosan Co., Ltd.Inventors: Takaaki Uchida, Tomoaki Takebe, Keisuke Funaki, Komei Yamasaki
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Patent number: 5350834Abstract: Poly(arylene sulfide/sulfone) polymers are treated in order to increase melt stability and decrease impurities by contacting the poly(arylene sulfide/sulfone) polymer with a soluble zinc compound and an acidic solution. In one embodiment, the polymer is treated first with the soluble zinc compound, followed by treatment with the acidic solution. In another embodiment, the polymer is treated in one step with a solution comprising a water soluble zinc compound in an acidic solution.Type: GrantFiled: May 14, 1993Date of Patent: September 27, 1994Assignee: Phillips Petroleum CompanyInventors: Rex L. Bobsein, Michael C. Yu, Roy F. Wright, David A. Soules
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Patent number: 5340917Abstract: This invention relates to syndiotactic polypropylene having greater than 55% racemic dyads having elastic characteristics at room or ambient temperature, a method for producing said syndiotactic polypropylene and articles made therefrom.Type: GrantFiled: May 7, 1993Date of Patent: August 23, 1994Assignee: Exxon Chemical Patents Inc.Inventors: Richard R. Eckman, Andrew J. Peacock, Paul M. Henrichs
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Patent number: 5340896Abstract: Aluminum-nitrogen polymers comprising a backbone of alternating aluminum and nitrogen atoms both having pendant organic groups, wherein some of the pendant organic groups are unsaturated, are prepared by reacting an unsaturated organic nitrile with a dialkylaluminum hydride. The polymers are crosslinked by supplying energy to generate free radicals. The crosslinked polymers can be pyrolyzed to form an aluminum nitride ceramic.Type: GrantFiled: November 8, 1993Date of Patent: August 23, 1994Inventor: James A. Jensen
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Patent number: 5340509Abstract: Disclosed is a process for pelletizing ultra high melt flow crystalline polymers to produce dust-free, uniform ultra high melt flow crystalline pellet products. The process comprises feeding polymer into melting/mixing means, resulting in molten polymer. The molten polymer is transferred to a droplet forming means that produces droplets of the molten polymer. The droplets collect on a continuously moving cooling conveyer and solidify to form dust-free, uniform ultra high melt flow crystalline polymer pellets. Further, the process produces ultra high melt flow crystalline polymer pellets which are uniformly compounded.Type: GrantFiled: June 30, 1992Date of Patent: August 23, 1994Assignee: Shell Oil CompanyInventors: David S. Chang, Aaron S. Rhee, Ronald K. Crossland, Jorge O. Buhler-Vidal
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Patent number: 5338808Abstract: A process for the solid state upgrading of a polyester resin by polyaddition reaction in which the resin is upgraded in the presence of an upgrading additive which is a compound different from a dianhydride of an aromatic tetracarboxylic acid, containing two groups capable of addition reactions with the terminal groups of the polyester, selected for example in the group of the dianhydrides of aliphatic and cycloaliphatic tetracarboxylic acids.Type: GrantFiled: December 28, 1992Date of Patent: August 16, 1994Assignee: M.& G. Ricerche S.p.A.Inventor: Guido Ghisolfi
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Patent number: 5334669Abstract: A process for the solid state polyaddition of a polyester resin in which the resin, blended in a molten state with a dianhydride of an aromatic tetracarboxylic acid is granulated, crystallized and then upgraded, characterized in that the crystallization and upgrading temperature is comprised in the range between the TG and 170.degree. C., preferably between 130.degree. and 170.degree. C.Type: GrantFiled: November 25, 1992Date of Patent: August 2, 1994Assignee: M. & G. Ricerche S.p.A.Inventor: Guido Ghisolfi
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Patent number: 5330668Abstract: An organic ferromagnetic substance including an amorphous carbonaceous substance in mid course of graphitization prepared from an organic compound having a hydrogen/carbon ratio of 1.7 or more and a process for producing same are disclosed. This organic ferromagnetic substance is stable and easy to produce, and has a high saturation magnetization and is advantageous as an industrial product such as a toner for copiers utilizing its light weight and high saturation magnetization.Type: GrantFiled: February 28, 1992Date of Patent: July 19, 1994Assignee: Director-General of Agency of Industrial Science & TechnologyInventors: Kazuhisa Murata, Akio Matsuda, Takashi Masuda
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Patent number: 5328982Abstract: Ester bonds are hydrolyzed in the conversion of substantially amorphous polyesters to their monomeric components, by being contacted with a mixture of (a) an alcohol, such as methanol, or glycol, (b) a polar aprotic solvent such as N-methyl-pyrrolidone or dimethyl sulfoxide and (c) an alkoxide or hydroxide such as sodium hydroxide.Type: GrantFiled: November 2, 1992Date of Patent: July 12, 1994Assignee: Eastman Chemical CompanyInventors: George W. Tindall, Randall L. Perry, Art T. Spaugh, Jr.
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Patent number: 5328981Abstract: A poly(arylene sulfide ketone) or poly(arylene sulfide diketone) resin having improved handling characteristics is prepared by a process comprising preparing in a first enclosed vessel a slurry comprising a solid poly(arylene sulfide ketone) or poly(arylene sulfide diketone) resin and a liquid polar organic compound, and optionally water; then substantially liquifying the resin to form a mixture comprising substantially liquified resin and polar organic compound; then flashing the mixture into a second vessel having a pressure lower than the first vessel, thereby removing a portion of the polar organic compound and solidifying the resin.When the slurry further comprises water, the invention method optionally includes a venting step prior to the substantial liquification of the resin and/or a concentration step after the substantial liquification of the resin.Type: GrantFiled: November 19, 1991Date of Patent: July 12, 1994Inventors: Afif M. Nesheiwat, Jon F. Geibel
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Patent number: 5326791Abstract: The present invention relates to a process for reactively separating hydrolyzable polymers, such as PET, in mixtures of the polymer and certain non-hydrolyzable polymers, specifically polyolefins by converting the hydrolyzable polymers to their corresponding water soluble components (e.g., PET to ethylene glycol and terephthalic acid) in the presence of liquid water at temperatures from about 200.degree. C. up to the critical temperature of water and autogenous pressure. The process has utility in recycling and waste material separation processes.Type: GrantFiled: December 20, 1991Date of Patent: July 5, 1994Assignee: Exxon Research and Engineering CompanyInventors: Ramzi Y. Saleh, William E. Wellman
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Patent number: 5324816Abstract: This invention relates to a process for improving the optical, thermal and/or mechanical properties of a polymer by subjecting a melt of the polymer to a shearing action at an effective shear rate, as for example a shear rate of greater than about 100 sec.sup.-1, for a time sufficient to improve said properties.Type: GrantFiled: June 14, 1989Date of Patent: June 28, 1994Assignee: Allied-Signal Inc.Inventors: Yash P. Khanna, John J. Belles, Jr., Annemarie C. Reimschuessel, Asis Banerjie
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Patent number: 5324817Abstract: The present invention relates to a process for dehydrochlorinating polyvinylchloride polymers to remove about 30 wt % chlorine therefrom by heating the starting materials PVC and deoxygenated liquid water, preferably neutral liquid water at temperatures from about 200.degree. C. up to the critical temperature of water at autogenous pressure to maintain the water as a liquid phase. The process has utility in recycling by enabling PVC to be dechlorinated specifically by a means that does not release chlorine gas.Type: GrantFiled: May 18, 1993Date of Patent: June 28, 1994Assignee: Exxon Research and Engineering CompanyInventors: Ramzi Y. Saleh, Michael Siskin, George A. Knudsen
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Patent number: 5314972Abstract: In one embodiment, a process is provided for treating virgin arylene sulfide resins, wherein a heated polymer slurry, comprising a virgin arylene sulfide resin and water, is contacted by a buffer solution having a pH less than about 9.35 but greater than that necessary to result in at least a partial curing of the virgin arylene sulfide resin. In a further embodiment, a process is provided for treating a virgin arylene sulfide resin, wherein a virgin arylene sulfide resin is slurried in a buffer solution having a pH less than about 9.35 but greater than that necessary to result in at least a partial curing of the virgin arylene sulfide resin. The treating process of this invention is conducted at an elevated temperature, below the melting point of the virgin arylene sulfide resin, while in the substantial absence of a gaseous oxidizing atmosphere. The treated arylene sulfide resins are recovered from the polymer slurry in a manner which does not result in at least a partial curing of the treated resin.Type: GrantFiled: September 21, 1989Date of Patent: May 24, 1994Assignee: Phillips Petroleum CompanyInventors: Afif M. Nesheiwat, John F. Geibel
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Patent number: 5312898Abstract: The present invention relates to a process for depolymerizing polyacrylonitrile into water soluble by-products, including ammonia and lower molecular weight carbonaceous materials by contacting the starting materials, polyacrylonitrile, and neutral, hot liquid water at a temperature from about 200.degree. C. up to the critical temperature of water at autogenous pressure. The present invention has utility as a means for degrading polyacrylonitrile without producing toxic hydrogen cyanide as a by-product.Type: GrantFiled: December 20, 1991Date of Patent: May 17, 1994Assignee: Exxon Research & Engineering Co.Inventors: Michael Siskin, Ramzi Y. Saleh, George A. Knudsen
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Patent number: 5306777Abstract: An acrylic molded product comprising an acrylic polymer coagulated material having excellent characteristics in impact resistance, optical properties, and hydrothermal resistance; an acrylic polymer coagulated material used for the preparation thereof; an composition comprising thereof; and a process for manufacture thereof; characterized by using an emulsion polymerization and a polymer with multiphase structured material comprising a hard phase and a soft phase and being freeze-coagulated.Type: GrantFiled: July 17, 1991Date of Patent: April 26, 1994Assignee: Kuraray Co., Ltd.Inventors: Kouichi Nogura, Kouichi Fujie, Chouji Suga, Naokiyo Inomata, Mitsuo Ootani
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Patent number: 5302686Abstract: A hollow article or sheet of a copolyester which comprises, as main components, terephthalic acid as a dicarboxylic acid component and ethylene glycol as a diol component and which is characterized by:(1) isophthalic acid as a dicarboxylic acid component being from 0.5 to 3.0 mol %,(2) diethylene glycol as a diol component being from 1.0 to 2.5 mol %,(3) the intrinsic viscosity being from 0.60 to 1.50 dl/g,(4) the concentration of terminal carboxyl groups being at most 18 eq/ton, and(5) the content of a cyclic trimer being at most 0.40% by weight.Type: GrantFiled: July 15, 1993Date of Patent: April 12, 1994Assignee: Mitsubishi Kasei CorporationInventors: Katsuji Tanaka, Hitoshi Matsumoto, Takuji Hirahara, Osamu Kishiro
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Patent number: 5300628Abstract: A chemically modified chelate resin comprising the reaction product of a cross-linked polymer bead chelate resin containing amine reaction sites with an aromatic aldehyde selected from the group consisting of 4-Formyl-benzo-15-Crown-5; 4-Formyl-benzo-18-Crown-6; 3,4-dihydroxybenzaldehyde; 3-ethoxy salicylaldehyde; salicylaldehyde; 2-pyridine carboxaldehyde, 3-pyridine carboxaldehyde; 4-pyridine carboxaldehyde; and pyrrole-2-carboxaldehyde.Type: GrantFiled: June 29, 1992Date of Patent: April 5, 1994Assignee: OCG Microelectronic Materials, Inc.Inventor: Kenji Honda
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Patent number: 5298530Abstract: A process of recovering components such as ethylene glycol and dimethylterephthalate from scrap polyester. The process steps are: (a) introducing oligomers of ethylene glycol and terephthalate acid or dimethyl terephthalate to a first vessel and heating the oligomers; (b) introducing scrap polyester to the first vessel and forming a startup melt with the oligomers; (c) transferring melt from the first vessel to a second vessel; (d) passing super-heated methanol through the melt in the second vessel to form a final melt comprising low molecular weight polyesters and monomers; (e) transferring final melt from the second vessel to the first vessel; and (f) recovering components from the second vessel.Type: GrantFiled: November 25, 1992Date of Patent: March 29, 1994Assignee: Eastman Kodak CompanyInventors: William J. Gamble, Andrius A. Naujokas, Bruce R. DeBruin
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Patent number: 5296510Abstract: A method for treating the surface of a thin porous film material of tetrafluoroethylene resin is disclosed, which comprises heating said surface to a temperature higher than the thermal decomposition point of said resin so as to decompose and remove part of said surface. The resulting thin porous film material of tetrafluoroethylene resin has an adhesive surface while retaining the desired pore size, hardness, and degree of penetration of adhesive.Type: GrantFiled: April 26, 1990Date of Patent: March 22, 1994Assignee: Sumitomo Electric Industries Ltd.Inventors: Katsuya Yamada, Koichi Okita, Shin-ichi Toyo-oka, Shigeru Asako
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Patent number: 5292862Abstract: The method includes the steps of feeding a polymer to an extruder where the polymer is melted, metering the molten polymer from the extruder to a tubular pyrolysis reactor through metering means connected to the extruder, and pyrolytically decomposing the polymer in the tubular pyrolysis reactor in the presence of a higher fatty acid, and/or a hydrochloric acid acceptor.Type: GrantFiled: January 22, 1992Date of Patent: March 8, 1994Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Eigo Miura, Takashi Yamanaka, Ryoji Ohori, Akio Ohdaira, Kenichi Nishiwaki, Yoshikuni Itoh, Yoshinori Morita, Hajime Inagaki
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Patent number: 5283318Abstract: The present invention relates to a process for depolymerizing and dehalogenating rubber materials by heating the rubber materials with neutral liquid water at temperatures from about 200.degree. C. up to the critical temperature of water at autogenous pressure. The process has utility in degrading rubber materials, and further does not release hydrogen halogen into a gas phase.Type: GrantFiled: December 20, 1991Date of Patent: February 1, 1994Assignee: Exxon Research and Engineering CompanyInventors: Ramzi Y. Saleh, Michael Siskin, George Knudsen
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Patent number: 5272216Abstract: Both a system and method are provided for remotely heating a polymeric material to a selected temperature. The system generally comprises particulate ferromagnetic material dispersed throughout the polymeric material to form a composite, wherein the particulate material has a Curie temperature that corresponds to the selected heating temperature, and a source of microwave energy for remotely applying a beam of microwave energy to the polymeric composite material. Preferably, the particulate ferromagnetic material comprises only about 2 percent of the total composite by weight. The polymeric material may be compliant, thermosettable plastic, and the Curie temperature of the particulate ferromagnetic material dispersed therein may advantageously be above the curing temperature of the polymer, such that the beam from the source of microwave energy may be used to remotely join surfaces or construct joints in composite structures.Type: GrantFiled: December 28, 1990Date of Patent: December 21, 1993Assignee: Westinghouse Electric Corp.Inventors: William G. Clark, Jr., Robert E. Shannon, Warren R. Junker
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Patent number: 5270442Abstract: Styrene-based polymer moldings with a crystallinity of at least 20% obtained by subjecting moldings of crystalline styrene-based polymers having mainly syndiotactic configuration to heat treatment at a temperature of 120.degree. to 270.degree. C. These moldings are excellent in physical properties such as heat resistance and chemical resistance, and thus are expected to find various applications, for example, in general construction materials, electric or electronic devices, and car parts.Type: GrantFiled: October 13, 1992Date of Patent: December 14, 1993Assignee: Idemitsu Kosan Co., Ltd.Inventor: Akikazu Nakano
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Patent number: 5264511Abstract: Monomers, B-stage polymers, C-stage polymers, cured polymers and electricy conducting polymers of acetylene-terminated aromatic monomers containing three benzene rings separated by ethylene groups are disclosed. These new polymers can withstand aggressive environments and are particularly adapted for use in high temperature composites in addition to the utilization of their electrical conducting properties. Preparation of these materials is accomplished by melt polymerization and heat treatment at high temperatures.Type: GrantFiled: June 30, 1992Date of Patent: November 23, 1993Assignee: The United States of America as represented by the Secretary of the NavyInventor: Theordore R. Walton
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Patent number: 5262489Abstract: A process is provided for producing a low molecular weight isoolefin polymer by contacting at conversion conditions a higher molecular weight saturated isoolefin polymer, for example, polyisobutylene or a copolymer of a C.sub.4 to C.sub.7 isoolefin and a para-alkylstyrene, in the melt phase, with an initiator, such as an oxygen-containing gas, an organic peroxide or an azo compound.Type: GrantFiled: February 25, 1993Date of Patent: November 16, 1993Inventors: Donald A. White, Lawrence W. Flatley, Richard C. Yeh, Raymond F. Murphy
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Patent number: 5260415Abstract: This invention relates to a process for the crosslinking of polymers containing diaryl ketone groups consisting of heating the polymer with an alcohol and/or alkoxide, and optionally exposing the polymer to a strong mineral acid. The crosslinked polymers have enhanced chemical resistance.Type: GrantFiled: March 12, 1992Date of Patent: November 9, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventor: Israel A. David
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Patent number: 5260397Abstract: Aluminum-nitrogen polymers comprising a backbone of alternating aluminum and nitrogen atoms both having pendant organic groups, wherein some of the pendant organic groups are unsaturated, are prepared by reacting an unsaturated organic nitrile with a dialkylaluminum hydride. The polymers are crosslinked by supplying energy to generate free radicals. The crosslinked polymers can be pyrolyzed to form an aluminum nitride ceramic.Type: GrantFiled: February 3, 1992Date of Patent: November 9, 1993Inventor: James A. Jensen
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Patent number: 5256363Abstract: Polyethylene terephthalates of the present invention are excellent in mechanical strength, heat resistance and transparency, and therefore blow molded containers molded from the present polyethylene terephthalate are excellent in high temperature filling properties when they are filled with juice, refrigerant beverage, carbonated beverage, seasonings, etc. Furthermore, the blow molded containers prepared from the present polyethylene terephthalates have such characteristic features that they are free from thermal deformation at the time when they are subjected to high temperature filling, they are readily subjected to sterilization treatment and hence excellent in high speed filling properties.Type: GrantFiled: December 4, 1992Date of Patent: October 26, 1993Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Mikio Hashimoto, Hiroji Niimi, Tadao Yatsu, Shigemi Shiraki
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Patent number: 5248734Abstract: Polyphenylene is prepared by exposing a poly(1,2-disubstituted-cyclohexa-3,5-diene) precursor to ultraviolet light in the presence of an acid catalyst. The acid catalyst is activated by the ultraviolet radiation and forms polyphenylene by aromatizing the cyclohexene rings of the poly(1,2-disubstituted-cyclohexa-3,5-diene).Type: GrantFiled: June 16, 1992Date of Patent: September 28, 1993Assignee: Cornell Research Foundation, Inc.Inventors: Christopher K. Ober, George Barclay, Thomas Mates, Hwan-Kyu Kim
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Patent number: 5237049Abstract: A process for purifying fluoropolymers by contacting them at temperatures above 140.degree. C. with a liquid perfluorinated cycloalkane. The resulting polymers are particularly useful where polymers with reduced impurities are desirable, such as in medical devices and in parts for the semiconductor manufacturing industry. The liquid perfluorinated cycloalkanes improve the adhesion of fluoropolymer to themselves and other materials.Type: GrantFiled: August 28, 1992Date of Patent: August 17, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventors: Robert J. Cavanaugh, William H. Tuminello
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Patent number: 5237048Abstract: There is disclosed a method for purifying a polymer by extracting volatile materials contained in the molten polymer. According to the disclosure, a polymer having a very high degree of extraction of volatile materials can be obtained. The polymer obtained by the method of disclosure can meet the severe demands of the market that restricts the concentration of remaining volatile material impurities.Type: GrantFiled: February 13, 1991Date of Patent: August 17, 1993Assignee: Toyo Engineering CorporationInventors: Hisashi Miyakawa, Takanobu Shinohara, Tetsuo Maeda
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Patent number: 5235034Abstract: Poly(arylene sulfide/sulfone) polymers are treated in order to increase melt stability and decrease impurities by contacting the poly(arylene sulfide/sulfone) polymer with a soluble zinc compound and an acidic solution. In one embodiment, the polymer is treated first with the soluble zinc compound, followed by treatment with the acidic solution. In another embodiment, the polymer is treated in one step with a solution comprising a water soluble zinc compound in an acidic solution.Type: GrantFiled: May 6, 1991Date of Patent: August 10, 1993Assignee: Phillips Petroleum CompanyInventors: Rex L. Bobsein, Michael C. Yu, Roy F. Wright, David A. Soules