From Inorganic Sulfur-containing Reactant Patents (Class 528/381)
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Patent number: 5750656Abstract: The invention is a process for the preparation of a sulfur-containing polymer, comprising:A. contacting sulfuric acid with one or more of fatty acid, fat or oil, and an inert solvent that allows dispersion of the sulfuric acid;B. contacting the mixture from Part A with a polymer which contains olefinic and/or aromatic unsaturation and, optionally, an organic acid anhydride under conditions such that a homogeneous sulfated or sulfonated polymer is formed wherein a sulfonated polymer is prepared when organic anhydride is present; and, optionally,C. contacting the mixture from Part B with a metal salt or one or more amine compounds under conditions such that a salt or neutralized form of a sulfated or sulfonated polymer is prepared.The process of the invention allows the preparation of homogeneous sulfonated or sulfated polymers at relatively high solids levels and at elevated temperatures.Type: GrantFiled: May 31, 1996Date of Patent: May 12, 1998Assignee: The Dow Chemical CompanyInventor: Michael O. Myers
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Patent number: 5712039Abstract: The invention provides a curable, structural epoxy adhesive composition comprising: (a) an epoxy resin; (b) a curing agent for the epoxy resin; and (c) a compound of the formula I: ##STR1## in which R.sup.1 and R.sup.2, which may be the same or different, are selected from an alkyl group, a hydroxyalkyl group, a cycloalkyl group, an aryl group, an arylalkyl group, or a heterocyclic group in which the one to three non-carbon atoms in the ring are independently selected from S, N, and O.Type: GrantFiled: April 11, 1995Date of Patent: January 27, 1998Assignee: Minnesota Mining and Manufacturing CompanyInventors: Virginia C. Marhevka, Allen L. Griggs, Kent S. Tarbutton
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Patent number: 5635587Abstract: A process for efficiently manufacturing high purity polyarylene sulfide. The process comprises feeding a liquid or gaseous sulfur compound (e.g. hydrogen sulfide) to a mixture comprising lithium hydroxide and a non-lithium hydroxide solid compound (e.g. alkali metal chloride or alkaline earth metal chloride) in a non-protonic organic solvent (e.g. N-methyl-2-pyrrolidone), separating the alkali metal chloride or alkaline earth metal chloride, adjusting the sulfur content of the reaction mixture, feeding a dihalogeno aromatic compound e.g. p-dichlorobenzene) to effect a polycondensation reaction, and adding of an alkali metal hydroxide (e.g. sodium hydroxide) to recover lithium ion.Type: GrantFiled: December 16, 1994Date of Patent: June 3, 1997Assignee: Idemitsu Petrochemical Co., Ltd.Inventors: Yoshinari Koyama, Norio Ogata, Hiroshi Nishitani
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Patent number: 5563240Abstract: Poly[2,5-bis(polysulphano)-1,3,4-thiadiazoles] of the formula ##STR1## wherein X signifies a number from 1 to 10 andn signifies a number from 2 to 1,000.Type: GrantFiled: June 29, 1995Date of Patent: October 8, 1996Assignee: Rhein Chemie Rheinau GmbHInventors: Hans-Joachim Graf, Volker Sch afer, Kurt Schilling, Clemens Schudok
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Patent number: 5561215Abstract: A method for removing cured sulfur-containing polymer sealants from surfaces is disclosed. The method comprises applying to the surface a sealant remover comprising at least about 50 wt. % of a pyrrolidone, especially N-methyl-2-pyrrolidone, and allowing the cured sulfur-containing polymer and the remover to remain in contact until the cured sulfur-containing polymer is loosened and can be easily removed from the surface. The method of the invention enables fast, effective removal of the sulfur-containing polymer sealants commonly used in the aerospace, construction, and insulating-glass industries.Type: GrantFiled: August 31, 1994Date of Patent: October 1, 1996Assignee: Arco Chemical Technology, L.P.Inventor: Daniel B. Pourreau
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Patent number: 5500474Abstract: Conductive polymers having repeating units of formula (II) ##STR1## formed by chemical or electrochemical oxidation of aniline derivatives of formula (I) ##STR2## wherein R.sub.1 denotes --(CH.sub.2).sub.n --; n is an integer between 2 and 12; R.sub.2, R.sub.3, R.sub.4 and R.sub.5 denote hydrogens or one or two of them can be a halogen atom, methyl, methoxy or nitro groups; and X denotes hydrogen an alkali metal ion, an ammonium ion, an alkyl ammonium ion or an anilinium ion. The conductive polymers have excellent stability toward electrochemical redox cyclization and good processibility.Type: GrantFiled: July 6, 1995Date of Patent: March 19, 1996Assignee: Korea Research Institute of Chemical TechnologyInventors: Suh B. Rhee, Myong-Hoon Lee, Chang-Jin Lee, Bong S. Moon
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Patent number: 5432257Abstract: A process is disclosed for preparing a polysulfide polymer using a heavy ends waste generated in chlorinated hydrocarbon production. The process involves first pretreating the heavy ends waste by an enriching process to form an enriched heavy ends waste with an ethylene dichloride content less than 10% by weight. The enriched heavy ends waste is then reacted with alkaline polysulfide within a temperature range of 50.degree. C. to 150.degree. C. to form a polysulfide polymer.Type: GrantFiled: October 26, 1994Date of Patent: July 11, 1995Assignee: Formosa Plastics CorporationInventors: Chester Lee, Tao C. Chang, Yung-Hui Huang
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Patent number: 5411776Abstract: A sealant comprising a mercapto-terminal liquid oligomer containing plasticizers, fillers and additives wherein the improvement comprises as curing agent an acrylic or methacrylic compound with at least two acrylic or methacrylic groups per molecule and a guanidine derivative as a curing catalyst having good chemical and weathering stability, low water vapor permeability and long-term elasticity properties.Type: GrantFiled: March 25, 1994Date of Patent: May 2, 1995Assignee: Morton International, Inc.Inventors: Gerald Schmidt, Rainer Jung
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Patent number: 5364928Abstract: A process for preparing high molecular weight arylene sulfide polymers by dehydrating an aqueous mixture of a sulfur source and a cyclic organic amide to form a dehydrated mixture, contacting the dehydrated mixture with a dihaloaromatic compound to produce a polymerization mixture, polymerizing the polymerization mixture and recovering the arylene sulfide polymer wherein an aqueous alkali metal carboxylate mixture is added to the polymerization mixture after the conversion of the dihaloaromatic compound is about 40 percent to about 30 minutes prior to entering into termination of the polymerization.Type: GrantFiled: May 14, 1993Date of Patent: November 15, 1994Assignee: Phillips Petroleum CompanyInventor: Carlton E. Ash
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Patent number: 5306805Abstract: This invention relates to a simplified process for the preparation of polyarylene sulphides with improved product quality from alkali metal sulphides and dihalogenated aromatic compounds, in which the alkali metal sulphides are prepared and reacted in situ.Type: GrantFiled: February 10, 1992Date of Patent: April 26, 1994Assignee: Bayer AGInventors: Wolfgang Arlt, Wolfgang Alewelt, Karl-Heinrich Meyer, Manfred Schmidt, Erhard Tresper, Wolfgang Eisermann
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Patent number: 5268451Abstract: The present invention discloses a process for producing a granular polyarylene sulfide which has a high melt viscosity and a high degree of cross-linkage, becomes gel under melting and is easy to handle in the production and the fabrication thereof.The process disclosed herein comprises (1) a step (A) an initial-stage polymerization step for obtaining a polyarylene sulfide by reacting an alkali metal sulfide, a dihaloaromatic compound and a polyhaloaromatic compound, having three or more halogen substituents in a molecule, in the presence of water in an amount of 0.5 to 2.9 moles per mol of said alkali metal sulfide at a temperature in the range of 180.degree. to 235.degree. C. until the total conversion ratio of said dihalo- and polyhaloaromatic compounds reaches 50 to 98% and the melt viscosity of a polyarylene sulfide obtained at the end of the step becomes 5 to 5,000 poise, measured at 310.degree. C.Type: GrantFiled: December 3, 1992Date of Patent: December 7, 1993Assignee: Kureha Kagaku Kogyo Kabushiki KaishaInventors: Yo Iizuka, Toshio Hosokawa, Yoshinobu Itoh, Shinji Yamamoto, Kazuo Kusida, Takayuki Katto
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Patent number: 5250657Abstract: Polyarylene thioether is easily prepared by oxidative polymerizing an aromatic compound of the formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are independently a hydrogen atom, a halogen atom, a lower alkyl group or a lower alkoxy group, and Y is a hydrogen atom or a group of the formula: ##STR2## wherein R.sup.5, R.sup.6, R.sup.7 and R.sup.8 are independently a hydrogen atom, a halogen atom, a lower alkyl group or a lower alkoxy group and X is --O--, --S--, a methylene group or an ethylene group with a sulfidizing agent in the presence of an acid and an oxidizing agent, or in the presence of an acid, a catalyst for oxidative polymerization and oxygen, or in the presence of a Friedel-Crafts catalyst.Type: GrantFiled: January 29, 1991Date of Patent: October 5, 1993Assignee: Seisan Kaihatsu Kagaku KenkyushoInventors: Eishun Tsuchida, Hiroyuki Nishide, Kimihisa Yamamoto, Mitsutoshi Jikei, Junya Katoh
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Patent number: 5239050Abstract: A process for preparing high molecular weight arylene sulfide polymers by dehydrating an aqueous mixture of a sulfur source and a cyclic organic amide to form a dehydrated mixture, contacting the dehydrated mixture with a dihaloaromatic compound to produce a polymerization mixture, polymerizing the polymerization mixture and recovering the arylene sulfide polymer wherein an aqueous alkali metal carboxylate mixture is added to the polymerization mixture after the conversion of the dihaloaromatic compound is about 40 percent to about 30 minutes prior to entering into termination of the polymerization.Type: GrantFiled: May 13, 1991Date of Patent: August 24, 1993Assignee: Phillips Petroleum CompanyInventor: Carlton E. Ash
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Patent number: 5200500Abstract: The present invention discloses a process for producing a granular polyarylene sulfide which has a high melt viscosity and a high degree of cross-linkage, becomes gel under melting and is easy to handle in the production and the fabrication thereof.The process disclosed herein comprises (1) a step (A) an initial-stage polymerization step for obtaining a polyarylene sulfide by reacting an alkali metal sulfide, a dihaloaromatic compound and a polyhaloaromatic compound, having three or more halogen substituents in a molecule, in the presence of water in an amount of 0.5 to 2.9 moles per mol of said alkali metal sulfide at a temperature in the range of 180.degree. to 235.degree. C. until the total conversion ratio of said dihalo- and polyhaloaromatic compounds reaches 50 to 98% and the melt viscosity of a polyarylene sulfide obtained at the end of the step becomes 5 to 5,000 poise, measured at 310.degree. C.Type: GrantFiled: August 22, 1990Date of Patent: April 6, 1993Assignee: Kureha Kagaku Kogyo Kabushiki KaishaInventors: Yo Iizuka, Toshio Hosokawa, Yoshinobu Itoh, Shinji Yamamoto, Kazuo Kusida, Takayuki Katto
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Patent number: 5179194Abstract: Disclosed herein is a process for the production of a polyarylenesulfide, wherein an alkali metal sulfide is reacted with a dihalo-aromatic compound in an organic amide solvent. The process comprises causing at least one compound selected from the oxides and hydroxides of alkaline earth metals to exist in a proportion not less than 0.01 mole but less than 0.1 mole per mole of the alkali metal sulfide charged in the reaction system, and performing the reaction of the alkali metal sulfide and dihalo-aromatic compound while raising the temperature by at least two stages in the presence of water in an amount defined in a specific range. A high-molecular weight linear polyarylenesulfide can be provided without use of a crosslinking agent or a polymerization aid.Type: GrantFiled: January 14, 1991Date of Patent: January 12, 1993Assignee: Kureha Kagaku Kogyo K.K.Inventors: Yukichika Kawakami, Yo Iizuka, Takayuki Katto
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Patent number: 5112892Abstract: A polymer solution contains a sulphonated polyarylethersulphone in a solvent mixture containing at least three components, where the solvent mixture has a delta-H in the range from 3 to 8.5; a delta-P in the range from 4 to 8 and a delta-D in the range 7.2 to 9.5 and each component of the solvent mixture is a liquid or low melting solid which is a non-solvent or poor solvent for the sulphonated polyarylethersulphone, and at least one of the components satisfies at least one of the conditions:a) said component has a delta-D of less than 8 when the value of delta-P is not more than 3; andb) said component has a delta-H of greater than 3 when the value of delta-P is at least 8.5; andc) said component has a delta-H of less than 8 when it contains at least one hydroxylic group; andd) said component is free of hydroxylic groups and has a delta-P which is greater than 3 and less than 8.5.The solution can be used for the production of membranes suitable for use in reverse osmosis applications.Type: GrantFiled: September 6, 1990Date of Patent: May 12, 1992Assignee: Imperial Chemical Industries plcInventors: Peter T. Cardew, David R. Holmes, John W. Smith
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Patent number: 5066776Abstract: The invention concerns a process for the manufcture of polyarylene sulphides from alkali sulphide and aromatic dihalogen compounds, whereby the alkali sulphide is produced in situ.Type: GrantFiled: August 13, 1990Date of Patent: November 19, 1991Assignee: Bayer AktiengesellschaftInventors: Wolfgang Russeler, Karsten-Josef Idel, Ernst-Ulrich Dorf, Wolfgang Alewelt, Dieter Freitag
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Patent number: 5030672Abstract: An asymmetric membrane formed from a sulphonated polyarylethersulphone has a salt rejection of at least 99%. Alternatively, a membrane has a good salt rejection and an acceptable water flux such that the ratio ##EQU1## has the value of at least 0.7. The membranes can be obtained using barium salts of the sulphonated polyarylethersulphone, with the proportion of barium being controlled to be at least 85%, preferably at least 86%, and not more than 91%, preferably not more than 90% of the barium required to react with the sulphonic acid groups on the sulphonated polymer.Type: GrantFiled: October 1, 1990Date of Patent: July 9, 1991Assignee: Imperial Chemical Industries PLCInventors: Richard A. Hann, David R. Holmes, John W. Smith
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Patent number: 4973663Abstract: A novel thermoplastic poly(arylene thioether) copolymer which may be cross-linked is provided. The copolymer may be prepared by reacting a dihalogenobenzonitrile, a dihalogenophenyl sulfone and a thioetherifying agent in a suitable organic solvent.Type: GrantFiled: April 14, 1989Date of Patent: November 27, 1990Assignee: Tosoh CorporationInventors: Tomoji Tamai, Tetsuya Asahi, Yozo Kondo
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Patent number: 4965338Abstract: The properties of polyesters, in particular the tracking index and the antistatic properties, can be improved by the addition of a salt of an alkane sulphonic acid.Type: GrantFiled: August 9, 1989Date of Patent: October 23, 1990Assignee: General Electric CompanyInventors: Farshid M. H. Tabankia, Jan de Boer
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Patent number: 4942218Abstract: The present invention provides a method of making a polymer by reacting, in the absence of water, an organic compound having the general formula R-H wherein R represents an organo radical having at least one unsaturated carbon-carbon bond and H is covalently bonded to one of said carbons, with PX.sub.3, wherein X is a halide radical, and zirconium ions to yield a reaction product and oxidizing and hydrolyzing such reaction product to yield a polymer represented by the general formula Zr(O.sub.3 PR).sub.n wherein n varies from about 1 to about 2.5. R may comprise sulfonic acid groups or may comprise sulfonatable site for sulfonation during the oxidation step. In either case, the resulting product is useful as an acid catalyst.Type: GrantFiled: May 23, 1988Date of Patent: July 17, 1990Assignee: Catalytica Associates, Inc.Inventors: William A. Sanderson, David L. King
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Patent number: 4920193Abstract: An asymmetric membrane formed from a sulphonated polyarylethersulphone has a salt rejection of at least 99%. Alternatively, a membrane has a good salt rejection and an acceptable water flux such that the ratio ##EQU1## has the value of at least 0.7. The membranes can be obtained using barium salts of the sulphonated polyarylethersulphone, with the proportion of barium being controlled to be at least 85%, preferably at least 86%, and not more than 91%, preferably not more than 90% of the barium required to react with the sulphonic acid groups on the sulphonated polymer.Type: GrantFiled: July 19, 1988Date of Patent: April 24, 1990Assignee: Imperial Chemical Industries PLCInventors: Richard A. Hann, David R. Holmes, John W. Smith
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Patent number: 4739018Abstract: Polycarbon sulphide derivatives comprise units (R.sub.x CS.sub.m).sub.n in whichR represents hydrogen, an alkali metal or a transition metal,x is the degree to which R is present in the carbon-sulphur structure,m is the degree of substitution with sulphur andn is the number of units in the polymer chain.As shown by the single figure of the drawing, the insertion of R is reversible.Type: GrantFiled: July 10, 1985Date of Patent: April 19, 1988Assignee: Societe Nationale Elf AquitaineInventors: Michel Armand, Mireille Fouletier, Pierre Degott
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Patent number: 4719286Abstract: A conductive polymer is set forth which comprises a plurality of interconnected units. Each unit comprises a generally centrally positioned moiety and a ligand or set of ligands having a total dentation capability of three or more non-coplanar dentations and being positioned about the centrally positioned moiety, at least two of the dentations being parts of conjugated systems. The units are interconnected by having at least one ligand in common and the conjugation of the conjugated systems extend from one centrally positioned moiety to an adjacent centrally positioned moiety. Through proper selection of ligands and centrally positioned moieties, conductive polymers of various desired characters including intrinsically conductive polymers, p-type semiconductor polymers, n-type semiconductor polymers, p-type metal conducting polymers and a n-type metal conducting polymers can be constructed.Type: GrantFiled: March 14, 1985Date of Patent: January 12, 1988Assignee: Northrop CorporationInventor: Sheldon L. Matlow
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Patent number: 4649190Abstract: Poly(sulfide carbonate) compositions are prepared by reacting a bis(allyl)carbonate with a sulfur dihalide and optionally also with a bis- or polyallyl compound.Type: GrantFiled: February 28, 1986Date of Patent: March 10, 1987Assignee: The Dow Chemical CompanyInventors: Robert E. Hefner, Jr., Mary N. White
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Patent number: 4605733Abstract: A polyarylene sulfide is prepared in a reaction mixture containing a dihaloaromatic compound, a sulfur source, a polar organic compound and an alkali metal or alkaline earth metal dithionite. The presence of dithionite in the reaction mixture enables the production of polymer and products therefrom having a reduced Tmc and enhanced heat stability.Type: GrantFiled: August 31, 1984Date of Patent: August 12, 1986Assignee: Phillips Petroleum CompanyInventor: Guy Senatore
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Patent number: 4503206Abstract: Tetrafluoroethylene is reacted in an aqueous environment with hydroxyl radicals, generating a mixture of water soluble and water insoluble .alpha.,.omega.-perfluorodicarboxylic acids.Type: GrantFiled: December 22, 1982Date of Patent: March 5, 1985Assignee: Indiana University FoundationInventor: Ivan M. Robinson
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Patent number: 4503205Abstract: A soluble polyene polymer and a method of making the same are disclosed. The polymer is of the class suitable for doping to produce an electrically conductive polymer. The method is generally applicable to acetylenic and aromatic monomers, proven examples of which include acetylene, benzene, anthracene and napthalene. In accordance with the method, the monomer is dissolved in arsenic trifluoride. Arsenic pentafluoride is then introduced into the solution to induce polymerization by what is speculated to be an ionic polymerization reaction. The resulting polymer differs from other polyene polymers in that it is soluble in common organic solvents, and further in that it can be melted without undergoing decomposition, thereby rendering it particularly suitable for processing to form various polymeric articles.Type: GrantFiled: December 16, 1983Date of Patent: March 5, 1985Assignee: The United States of America as represented by the United States Department of EnergyInventors: Mahmoud Aldissi, Raimond Liepins
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Patent number: 4501884Abstract: This invention relates to a process for the production of optionally branched polyarylene sulphides in piperazinones as solvent.Type: GrantFiled: October 31, 1983Date of Patent: February 26, 1985Assignee: Bayer AktiengesellschaftInventors: Edgar Ostlinning, Karsten Idel
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Patent number: 4493927Abstract: Condensation polymers having sulfur containing backbones exhibit high char formation properties. Polymers are prepared, for example, by reacting sodium tetrasulfide and dicyclopentadiene dichloroacetate under polymerization conditions.Type: GrantFiled: December 22, 1983Date of Patent: January 15, 1985Assignee: The Dow Chemical CompanyInventors: Kathleen M. McCreedy, Kenneth R. Hilton
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Patent number: 4393241Abstract: Provided is a novel process for the synthesis of aryl sulfides substituted with an alkoxy or phenoxy substituent. The process comprises reacting an alkoxy or phenoxy substituted aromatic compound with a sulfur dihalide, preferably sulfur dichloride, in the presence of an alkali metal tetrafluoroborate catalyst, with the amount of said aromatic reactant compound preferably being sufficient to solvate the sulfur dichloride and catalyst sufficiently to allow the reaction to occur.Type: GrantFiled: February 1, 1982Date of Patent: July 12, 1983Assignee: Celanese CorporationInventors: Harry T. Hanson, John B. Sapp, Jr.
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Patent number: 4361693Abstract: Poly(arylene ketones) are prepared by the reaction of difunctional aromatic compounds with derivatives of thio- or dithiocarbonic acids in the presence of a superacid catalyst system. In a preferred embodiment, diphenyl ether reacts with S-methyl chlorothioformate in HF/BF.sub.3 to produce poly(p-phenyleneoxy-p-phenylene carbonyl), i.e.Type: GrantFiled: July 8, 1981Date of Patent: November 30, 1982Assignee: Raychem CorporationInventor: Viktors Jansons
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Patent number: 4346191Abstract: An alkali metal hydroxide, sulfur, a polyfunctional amine and an oxidated silicon compound are mixed, then heated to just above the melting temperature of sulfur while agitating for 10 to 30 minutes, thereby producing an alkali metal amine polysulfide silicate reaction product; then it is added to an aqueous solution containing an emulsifying or dispersing agent and is reacted with a polysubstituted organic compound, thereby producing a poly(amine polysulfide silicate) resinous product which may be used to cure epoxy resins.Type: GrantFiled: March 3, 1981Date of Patent: August 24, 1982Inventor: David H. Blount
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Patent number: 4281072Abstract: A polymeric material which comprises an amorphous solid solution formed between a metallic compound and a polymer by virtue of ether, thioether or urethane linkages contained therein, the metal of the metallic compound being selected from the group consisting of Be, Mg, Sr, Ba, Sc, Y, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn, Sb, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, Tl, Pb, Bi, Al, La and the other lanthanides.Type: GrantFiled: October 12, 1979Date of Patent: July 28, 1981Assignee: National Research Dev'p Corp.Inventors: Raymond E. Wetton, David B. James
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Patent number: 4259474Abstract: The sulfur-containing polyoxyalkylenes having the formula: ##STR1## wherein E is --SW or a halogen atom; W is hydrogen, phenyl, alkyl of 1 to 4 carbon atoms, an alkali metal or ammonium ion, or a heterocyclic radical containing from 2 to 4 hetero atoms in a 5-or 6-membered ring which may be monocyclic or may be fused to an aromatic ring; A, C and D represent lower alkylene of 2 to 4 carbon atoms; B is alkylene of 2 to 8 carbon atoms; y and z are each integers having a value of 0 to 50; x is an integer having a value of from 2 to 50; and n is an integer having a value of from 1 to 30; and intermixtures of said polyoxyalkylenes.The above compounds display a wide variety of uses; however, all are active metal working lubricants.Type: GrantFiled: September 25, 1979Date of Patent: March 31, 1981Assignee: GAF CorporationInventors: Paritosh M. Chakrabarti, Lindley S. Wood, David J. Tracy
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Patent number: 4255561Abstract: The sulfide polymers of polyoxyalkylenes having the formula: ##STR1## wherein M is alkyl of from 1 to 4 carbon atoms, benzyl, phenyl, hydrogen or an alkali metal or ammonium ion; A, C and D represent lower alkylene of 2 to 4 carbon atoms; B is alkylene of 2 to 8 carbon atoms; y and z are each integers having a value of 0 to 50; x is an integer having a value of from 1 to 50; n is an integer having a value of 1 to 30; and m has a value of from 2 to 10; and intermixtures of said polyoxyalkylene sulfide polymers.The above polymers have excellent antioxidating properties and are useful as synthetic metal working lubricants, antistatic agents and antioxidants for various other types of applications. They can also be used as crosslinking agents to impart oxidation resistance and static elimination.Type: GrantFiled: September 25, 1979Date of Patent: March 10, 1981Assignee: GAF CorporationInventors: Lindley S. Wood, David J. Tracy, Paritosh M. Chakrabarti
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Patent number: 4197395Abstract: A process, and the composition therefrom, is provided for crosslinking of polymers containing hydroxy or mercaptan groups by reaction with polyaldehyde compounds, the crosslinks being thermally labile.Type: GrantFiled: March 27, 1978Date of Patent: April 8, 1980Assignee: Polysar LimitedInventors: Raymond U. Lemieux, Rastko Vukov
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Patent number: 4195132Abstract: The present invention relates to novel, substantially insoluble and infusible plastics which are cross-linked by way of triazine rings and, optionally, by way of tri-substituted bis-oxymethylene urea groups or urethane groups.Type: GrantFiled: May 5, 1977Date of Patent: March 25, 1980Assignee: Bayer AktiengesellschaftInventors: Rudolf Sundermann, Gunther Rottloff, Ernst Grigat
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Patent number: 4178433Abstract: Polyarylene sulfide resins essentially free of disulfide linkages are obtained by reacting S.sub.2 Cl.sub.2 or S.sub.2 Br.sub.2 with a benzenoid aromatic compound having 0-2 substituents per benzene ring at about 90.degree. C.-350.degree. C. in the presence of a metal halide Friedel-Crafts catalyst. The process is conveniently carried out at 90.degree. C.-150.degree. C. in inert solvent solution from which the polymer precipitates as it is formed.Type: GrantFiled: May 11, 1978Date of Patent: December 11, 1979Assignee: The Dow Chemical CompanyInventor: Harry A. Smith
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Patent number: 4175178Abstract: Novel polymers, useful as films or filaments, are prepared as by the reaction of a bispiperazide with a reactive derivative of an acid.Type: GrantFiled: June 16, 1978Date of Patent: November 20, 1979Assignee: s.a. Texaco Belgium n.v.Inventor: Johny C. Hermans
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Patent number: 4175179Abstract: Novel polymers, useful as films or filaments, are prepared as by the reaction of a bispiperazide with a reactive derivative of an acid.Type: GrantFiled: June 22, 1978Date of Patent: November 20, 1979Assignee: s.a. Texaco Belgium n.v.Inventor: Johny C. Hermans