Ring Consisting Of Silicon And Oxygen Patents (Class 556/460)
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Patent number: 5545837Abstract: The present invention relates to cyclic organosilicon compounds which are viscous liquids at room temperature and have a high surface tension. The present invention also relates to methods of making the cyclic organosilicon compounds which easily produce these compounds in good yields.Type: GrantFiled: May 16, 1995Date of Patent: August 13, 1996Assignee: Dow Corning Toray Silicone Co., Ltd.Inventor: Hideki Kobayashi
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Patent number: 5539137Abstract: A method is provided for making silicone fluids having a high refractive index by effecting a hydrosilylation reaction between an arylacetylene such as phenylacetylene and a silicon hydride substrate, such as a cyclic or linear hyridosiloxane in the presence of a platinum catalyst.Type: GrantFiled: June 7, 1995Date of Patent: July 23, 1996Assignee: General Electic CompanyInventors: Larry N. Lewis, Susan A. Nye
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Patent number: 5519158Abstract: A method of polymerizing organosiloxane monomers to produce high molecular weight polymers having a relatively narrow range of molecular weights, which includes drying the monomers to a selected moisture content of 10 ppm or less by moisture transfer contact with a desiccant at temperatures below the polymerization temperature prior to polymerization.Type: GrantFiled: November 21, 1994Date of Patent: May 21, 1996Assignee: General Electric CompanyInventor: Edwin R. Evans
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Patent number: 5516870Abstract: Linear or straight-chain trimethylsiloxy endcapped methylhydrogen polysiloxanes are made by contacting hexamethyldisiloxane with a highly pure methylhydrogen cyclic siloxane, in the presence of anhydrous trifluoromethane sulfonic acid catalyst at room temperature. Trimethylsiloxy endcapped alkylmethyl siloxanes are made by reacting the linear or straight-chain trimethylsiloxy endcapped methylhydrogen polysiloxanes with an alpha-olefin, in the presence of a platinum catalyst. Alkylmethyl cyclic siloxanes containing zero parts per million residual .ident.SiH, are made by reacting anhydrous alpha-olefins and a highly pure methylhydrogen cyclic siloxane, in the presence of dried platinum supported on carbon catalyst.Type: GrantFiled: May 3, 1995Date of Patent: May 14, 1996Assignee: Dow Corning CorporationInventors: Timothy N. Biggs, Gary E. Le Grow
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Patent number: 5491249Abstract: Cyclic polysiloxanes are produced by continuously passing a feed comprising linear polysiloxanes through a reactor containing a solid acidic catalyst at a pressure greater than one atmosphere under an inert atmosphere to produce a mixture comprising volatile cyclic polysiloxanes, nonvolatile reaction products, and unreacted linear polysiloxanes. The volatile products can then be recovered, and the nonvolatile reaction products and unreacted linear polysiloxanes can be added to the linear polysiloxane feed to form a recycle stream that is passed back through the reactor. Recycling increases the yield of the desired cyclic species.Type: GrantFiled: April 20, 1995Date of Patent: February 13, 1996Assignee: Hercules IncorporatedInventor: John N. Kostas
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Patent number: 5484867Abstract: A process for preparation of reactive polyhedral oligomeric silsesquioxanes and the subsequent synthesis of polysilsesquioxanes which produce high yield, tractable polymers containing silsesquioxane segments is provided. A trifunctional polyhedral oligomeric silsesquioxane of the formula Si.sub.7 R.sub.7 O.sub.9 (OA).sub.3 is corner capped by reacting it with a compound of the formula M-Z to form a polyhedral oligomeric silsesquioxane which can be reacted in various ways with oligomers, polymers, catalysts, or co-monomers to form polyhedral silsesquioxane polymers containing silsesquioxanes as pendant, block, or end group segments. The resulting polymers are essentially free of impurities and have controllable properties through the proper selection of the synthesis process and starting materials.Type: GrantFiled: June 1, 1994Date of Patent: January 16, 1996Assignees: The University of Dayton, The Regents of the University of California, The United States of America as represented by the Secretary of the Air ForceInventors: Joseph D. Lichtenhan, Jeffrey W. Gilman, Frank J. Feher
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Patent number: 5473037Abstract: Disclosed is a method of producing dimethylpolysiloxanes through hydrolysis of dimethyldichlorosilane wherein a water solution containing a water-soluble oxygen-containing organic compound is introduced into dimethyldichlorosilane. Therein, linear dimethylpolysiloxanes alone having both ends blocked with chlorine atoms can be selectively produced by properly controlling the water content in the hydrolysis system and further by rendering the hydrolysis system acidic, and cyclic dimethylpolysiloxanes alone can also be selectively produced by properly controlling the water content in the hydrolysis system and optionally rendering the hydrolysis system acidic.Type: GrantFiled: August 17, 1994Date of Patent: December 5, 1995Assignee: Shin-Etsu Chemical Co. Ltd.Inventors: Kunio Itoh, Toshio Shinohara, Hiroaki Kizaki, Shoichi Tanaka, Yukinori Satou, Kazunobu Umemura
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Patent number: 5436360Abstract: The present invention relates to novel cyclic or linear allylpolysiloxane type silicone fluids having allylalkylsiloxy and diorganosiloxy groups as represented by the formula I and their preparation methods by hydrolyzing mixtures of allyldichlorosilane and diorganodichlorosilane as represented by the formula II and formula III respectively. ##STR1## wherein R is selected from the group consisting of hydrogen alkyl(C.sub.3 -C.sub.20), chloroalkyl, cyanoalkyl, fluoroalkyl, and phenylalkyl group; R.sup.x and R.sup.2 represent independentlhydrogen, methyl or phenyl group; M represents H or SiMe.sub.3 group wherein Me is methyl group and when M is hydrogen, the silanol groups at the both ends of the molecule easily undergo dehydration and cyclize to form the cyclic silicone fluids as represented by the following formula I'; the mixing ratio (x/y) of the compounds as represented in formula I and formula HI respectively can be 1:0.01-1:100; CH.sub.2 CH.sub.2 R.sup.3 of formula II equals to R of formula I or I'.Type: GrantFiled: September 8, 1994Date of Patent: July 25, 1995Assignee: Korea Institute of Science and TechnologyInventors: Il N. Jung, Bok R. Yoo, Bong W. Lee, Seung H. Yeon
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Patent number: 5420325Abstract: The present invention relates to an improved cracking process for continuously making cyclic siloxanes.Type: GrantFiled: July 29, 1994Date of Patent: May 30, 1995Assignee: General Electric CompanyInventor: John S. Razzano
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Patent number: 5412053Abstract: A synthesis process for polysilsesquioxanes which produces a high yield, tractable copolymer of perfectly alternating silsesquioxane and bridging group segments is provided. A difunctional silsesquioxane monomer of the formula Si.sub.8 R.sub.8 O.sub.11 (OA).sub.2 or Si.sub.7 R.sub.7 O.sub.9 (OSiR.sup.4 R.sup.5 R.sup.6)(OA).sub.2 is reacted with a difunctional compound of the formula X--M--X which forms a bridging group for a time sufficient to condense the difunctional silsesquioxane monomers and bridging groups into a linear polymer containing alternating silsesquioxane and bridging group segments. The resulting linear copolymer is essentially free of impurities and has controllable properties through the proper selection of the monomeric starting materials.Type: GrantFiled: August 12, 1993Date of Patent: May 2, 1995Assignee: The University of DaytonInventors: Joseph D. Lichtenhan, Ngo Q. Vu, Jeffrey W. Gilman, Frank J. Feher
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Patent number: 5412055Abstract: Disclosed are organosilicon crosslinked polymers and crosslinkable prepolymers that are the reaction product of (a) a cyclic polysiloxane in which each silicon atom is substituted with (i) a saturated, substituted or unsubstituted alkyl or alkoxy group or a substituded or unsubstituted aryl or aryloxy group, and (ii) a substituted or unsubstituted hydrocarbon group having at least one carbon-carbon double bond that is reactive in hydrosilation, (b) at least one organosilicon compound having at least two .tbd.SiH groups, and optionally (c) a hydrocarbon polyene having at least two nonaromatic carbon-carbon double bonds that are reactive in hydrosilation. A process for preparing the polymers and prepolymers and for preparing the cyclic polysiloxanes is also disclosed.Type: GrantFiled: April 18, 1994Date of Patent: May 2, 1995Assignee: Hercules IncoporatedInventor: De-Kai Loo
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Patent number: 5403945Abstract: A cyclotrisiloxane represented by the general formula (1): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 may be the same or different and are each an alkyl group of 1 to 3 carbon atoms and X is a cyclohexyl group or an alkyl group expressed by the formula:--C.sub.n H.sub.2n+1where n is an integer of 4 to 15. The cyclotrisiloxane is useful as an intermediate for producing silicone oils and silicone rubbers, and the obtained silicone oils and silicone rubbers are excellent in lubricity.Type: GrantFiled: November 5, 1993Date of Patent: April 4, 1995Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Hirofumi Kishita, Kouichi Yamaguchi, Kenichi Fukuda, Nobuyuki Kobayashi
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Patent number: 5384383Abstract: This invention pertains to pristine phenylpropylalkylsiloxanes consisting of mixtures of linear and cyclic siloxanes containing the structure ##STR1## and a method for their preparation. The pristine phenylpropylalkylsiloxanes of the instant invention contain no detectable silicon hydride (--SiH), free organics (--C.dbd.C--) or free inorganics. Additionally, the pristine phenylpropylalkylsiloxanes of the instant invention are high refractive index organosilicone polymers.Type: GrantFiled: January 31, 1994Date of Patent: January 24, 1995Assignee: Dow Corning CorporationInventors: Gary E. Legrow, Joan E. Sudbury-Holtschlag
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Patent number: 5359111Abstract: This invention discloses a method of controlling hydrosilylations in a reaction mixture by controlling the solution concentration of oxygen in the reaction mixture, relative to any platinum present in the reaction mixture. This invention further discloses a method for controlling isomerization in linear or branched alkenyl compounds having at least 4 carbon atoms during a hydrosilylation reaction by introducing a controlled amount of oxygen into the alkenyl compounds during the hydrosilylation. This invention further discloses a method for producing dicycloalkylsubstituted silanes by reacting a halo-or alkoxy-silane with a unsaturated cycloalkenyl compound in the presence of oxygen and a hydrosilylation catalyst.Type: GrantFiled: July 30, 1993Date of Patent: October 25, 1994Assignee: Dow Corning CorporationInventors: Don L. Kleyer, Binh T. Nguyen, Dale E. Hauenstein, Sean P. Davern, William J. Schulz, Jr.
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Patent number: 5347028Abstract: A composition curable to a thermally reversible rubber comprises(i) a strong acid catalyst having a pK.sub.a of less than about -9,(ii) at least one polycyclosiloxane containing at least one polyfunctional siloxane unit, and(iii) at least one polysiloxane selected from the group consisting of a linear polydimethylsiloxane; a polydimethylcyclosiloxane containing from about 6 to about 50 silicon-oxygen bonds; a linear or cyclic block copolymer of polydimethylsiloxane and a non-siloxane organic polymer; and a linear or cyclic random copolymer of a siloxane of the formula Si(R)(R.sup.1)O wherein R and R.sup.1 are different and are selected from the group consisting of hydrogen, C.sub.1 -C.sub.18 hydrocarbon and C.sub.2 -C.sub.18 hydroxyalkyl,wherein the catalyst comprises from about 0.05 to about 0.5 wt % of the composition, and the concentration of polyfunctional siloxane units is at least about two times the catalyst concentration in the composition, but no more than about 0.27 molar.Type: GrantFiled: December 23, 1993Date of Patent: September 13, 1994Assignee: Temple University of the Commonwealth System of Higher EducationInventors: Mark A. Buese, Pao-Sun Chang
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Patent number: 5304667Abstract: The present invention relates to cyclic siloxanes which have at least one group of formula (1) bonded to a silicon atom--(CH.sub.2).sub.x --R"--[--L--A--].sub.y --(L).sub.z --T (1),in which x is an integer having a value of at least 2, preferably having a value of from 2 to 10, R" is a chemical bond or a divalent radical of the formula --COO--, --OOC--, --CH.sub.2 --CH.sub.2 --, --CH.dbd.CH--, --C.tbd.C--, --N.dbd.N--, --N.dbd.N, --N.dbd.CH--, --CH.dbd.N or --Si(R).sub.Type: GrantFiled: March 29, 1993Date of Patent: April 19, 1994Assignee: Consortium fur elektrochemische Industrie GmbHInventors: Norman Haeberle, Wolfgang Haas, Franz-Heinrich Kreuzer
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Patent number: 5282998Abstract: Mixtures of siloxane oligomers having a degree of oligomerization of 0 to 8, which have no more than one vinyl substituent attached per silicon atom as well as methoxy and/or ethoxy groups, the molar ratio of vinyl groups to alkoxy groups being 1:1 to 1:8, and in addition optionally alkyl substituents of 1 to 18 carbon atoms, the molar ratio of vinyl groups to alkyl groups being 1:0 to 1:8, are prepared by hydrolysis or cohydrolysis of vinyltrialkoxysilanes and optionally tetraalkoxysilanes and alkyltrialkoxysilanes in alcoholic solution in the presence of an acid catalyst with an amount of water calculated for the degree of oligomerization, followed by removal of the catalyst and of the free alcohol. The siloxane oligomer mixture is useful as a crosslinking agent for thermoplastic polyolefins.Type: GrantFiled: June 2, 1992Date of Patent: February 1, 1994Assignee: Huls AktiengesellschaftInventors: Michael Horn, Hans-Joachim Kotzsch
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Patent number: 5268511Abstract: A two step process, each of the steps being novel, for the production of trifluorovinyl ethers by reaction of a siloxane with selected acyl fluorides or carboxylic anhydrides, is disclosed. Also disclosed is a novel silyl ester intermediate.Type: GrantFiled: March 27, 1992Date of Patent: December 7, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventor: William B. Farnham
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Patent number: 5252767Abstract: This invention relates to a process for the preparation of organosiloxanes, in particular those containing a high proportion of low molecular weight cyclic and chain structured organosiloxanes, preferably cyclic dimethylsiloxanes, by hydrolysis of the corresponding organochlorosilanes, in which a high proportion of gaseous hydrogen chloride is formed at the same time.Type: GrantFiled: July 16, 1992Date of Patent: October 12, 1993Assignee: Bayer AktiengesellschaftInventors: Gunther Maass, Manfred Schulze
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Patent number: 5246703Abstract: A cyclopolysiloxane having the general structure ##STR1## wherein Q is a monovalent siloxane moiety selected from the group consisting of the structure (R.sub.3 SiO).sub.2 SiR--A-- and the structure GR.sub.2 SiOSiR.sub.2 --A'--, in which A is a divalent hydrocarbon group having 4 to 14 carbon atoms and A' is a divalent hydrocarbon group having 2 to 18 carbon atoms, each R' group and each G group is independently selected from the group consisting of an alkyl radical having 1 to 30 carbon atoms, a phenyl radical, an arylalkyl group and a halogenated alkyl radical having 3 to 6 carbon atoms, each R is independently selected from the group consisting of an alkyl radical having 1 to 30 carbon atoms. a phenyl radical, an arylalkyl group, a halogenated alkyl radical having 3 to 6 carbon atoms and hydrogen, and x and y are each integers, with the proviso that (x+y) is an integer having a value of 4 to 6 inclusive and y is at least 1.Type: GrantFiled: December 27, 1991Date of Patent: September 21, 1993Assignee: Dow Corning CorporationInventor: Loren D. Durfee
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Patent number: 5247116Abstract: Cyclosiloxanes are produced by the acid-catalyzed redistribution of siloxane bonds in polysiloxane fluids at a temperature of about 20-200.degree. C. Little catalyst and no water or solvent is required. Cyclosiloxane product mixtures contain .ltoreq.1 wt. % cyclosiloxane species having more than 18 silicon-oxygen bonds, and .ltoreq.0.5 wt. % cyclosiloxanes having 6 or fewer silicon-oxygen bonds, based upon the weight of the product mixture. The process may be carried out in continuous fashion where redistribution is carried out simultaneously with the stripping of cyclics from the equilibration mixture.Type: GrantFiled: July 10, 1992Date of Patent: September 21, 1993Assignee: Temple University of the Commonwealth System of Higher EducationInventors: Mark A. Buese, Pao-Sun Chang
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Patent number: 5241097Abstract: This invention relates to an improved, high-yield process for producing cyclic siloxane in a biphasic reaction solvent mixture comprising an alkane, an alcohol and water.Type: GrantFiled: December 21, 1992Date of Patent: August 31, 1993Assignee: Allied-Signal Inc.Inventors: Joseph J. Zupancic, Jeffrey P. Conrad
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Patent number: 5239085Abstract: An organocyclosiloxane having utility as a coupling agent is disclosed said organocyclosiloxane having the general formula ##STR1## wherein R.sup.1 is independently selected from monovalent hydrocarbon groups having 1 to 8 carbons, R.sup.2 is selected from the group consisting of an alkoxy group and an alkoxysilylalkyl group, R.sup.3 is an organofunctional group selected from the group consisting of glycidoxyalkyl, methacryloxyalkyl, N-(trialkylsilyl)aminoalkyl (hydroxyphenyl)alkyl and haloalkyl x is 1 to 6 and y is 1 to 6, with the proviso that x+y is an integer having a value of 3 to 8.Type: GrantFiled: February 26, 1992Date of Patent: August 24, 1993Assignee: Dow Corning Toray Silicone Co., Ltd.Inventors: Hiroji Enami, Shoji Akamatsu
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Patent number: 5233071Abstract: Alpha-fluorinated olefins are hydrosilated using selected cobalt compounds as catalysts. The products are useful in coatings, and as chemical intermediates, elastomers, and caulks.Type: GrantFiled: March 17, 1992Date of Patent: August 3, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventor: Lech Wilczek
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Patent number: 5233070Abstract: The present invention is a process for converting chlorine end-terminated polyorganosiloxanes to polyorganocyclosiloxanes. The process comprises forming a mixture comprising chlorine end-terminated polyorganosiloxanes, aqueous hydrogen chloride, and a heterogeneous reequilibrium catalyst. The mixture is heated at a temperature within a range of about 70.degree. C. to 150.degree. C. to effect reequilibrium of the chlorine end-terminated polyorganosiloxanes to form polyorganocyclosiloxanes which are removed from the process as they are formed.Type: GrantFiled: December 23, 1992Date of Patent: August 3, 1993Assignee: Dow Corning CorporationInventors: Gary N. Bokerman, Larry H. Wood
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Patent number: 5221759Abstract: The present invention relates to cyclic siloxanes which have at least one group of formula (1) bonded to a silicon atom--(CH.sub.2).sub.x --R"--[--L--A--].sub.y --(L).sub.z --T (1),in which x is an integer having a value of at least 2, preferably having a value of from 2 to 10, R" is a chemical bond or a divalent radical of the formula --COO--, --OOC--, --CH.sub.2 --CH.sub.2 --, --CH.dbd.CH--, --C.tbd.C--, --N.dbd.N--, --N.dbd.N(O)--, --CH.dbd.N--, --N.dbd.CH--, --N.dbd.N--, --N.dbd.N(O)--, --N.dbd.CH--, --CH.dbd.N--, or --Si(R).sub.Type: GrantFiled: July 11, 1991Date of Patent: June 22, 1993Assignee: Consortium fur Elektrochemische Industrie GmbHInventors: Norman Haeberle, Wolfgang Haas, Franz-Heinrich Kreuzer
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Patent number: 5196559Abstract: A process for preparing cyclosiloxanes by the redistribution of a cyclosiloxane or mixture of cyclosiloxanes in the presence of a rearrangement catalyst.Type: GrantFiled: January 23, 1992Date of Patent: March 23, 1993Assignee: Dow Corning CorporationInventors: William J. Schulz, Jr., Joseph B. Lambert, Lidia Kania
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Patent number: 5169970Abstract: A method for hydrolyzing an organochlorosilane to produce an organopolysiloxane, which comprisesa first-stage hydrolysis of hydrolyzing the organochlorosilane using a substantially stoichiometrically equivalent amount of water, thereby producing a hydrolyzate, anda second-stage hydrolysis of hydrolyzing the hydrolyzate obtained in the first-state hydrolysis using a stoichiometrically excess amount of aqueous hydrogen chloride solution having a predetermined hydrogen chloride concentration, thereby to produce an organopolysiloxane as a hydrolyzate and, at the same time, regulate the viscosity of the organopolysiloxane.Type: GrantFiled: June 26, 1989Date of Patent: December 8, 1992Assignee: Toshiba Silicone Co., Ltd.Inventor: Nobuaki Ohkawa
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Patent number: 5110972Abstract: The present invention relates generally to the re-utilization of silicone scrap material. More specifically, the process of the present invention is directed to dissolving silicone scrap in an appropriate solvent and chemically converting the scrap into dimethyl silicone cyclic trimer, tetramer, pentamer and/or the like by means of a two step acid/base catalyzed cracking process.Type: GrantFiled: July 18, 1991Date of Patent: May 5, 1992Assignee: Tremco IncorporatedInventor: Thomas W. Greenlee
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Patent number: 5095131Abstract: The described invention is a process for producing silanes and polysiloxanes. The process comprises contacting silica with a preformed alkylaluminum compound in the presence of a catalyst effective in facilitating the reaction. Preferred catalysts are copper, tin, zinc, phosphorous, and compounds thereof.Type: GrantFiled: November 19, 1990Date of Patent: March 10, 1992Assignee: Dow Corning CorporationInventors: Gary N. Bokerman, John P. Cannady, Douglas H. Lenz
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Patent number: 5086146Abstract: A methylalkoxy-methylalkyl cyclosiloxane copolymer having the formula(OSiROR).sub.d (OSiRR').sub.ewhere R is an alkyl radical having one to three carbon atoms; R' is the alkyl radical (CH.sub.2).sub.c R; c is an integer having a value of from 1 to 17; d is an integer having a value of from 3 to 10; and e is an integer having a value of from one to seven.Type: GrantFiled: April 8, 1991Date of Patent: February 4, 1992Assignee: Dow Corning CorporationInventors: Donald T. Liles, Renee A. Klein
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Patent number: 5068383Abstract: The instant invention is a catalyzed process for the redistribution of linear, chloride or hydroxy end-terminated polyorganosiloxanes or cyclic polyorganosiloxanes. Effective catalysts for the described process are alumina, silica-alumina, activated carbon, zeolite, and acid clay. The catalyzed redistribution process can be incorporated as an element of a three-stage process. The three-stage process allows control of the yield of cyclic polyorganosiloxanes.Type: GrantFiled: November 9, 1990Date of Patent: November 26, 1991Assignee: Dow Corning CorporationInventors: Jodi A. Bourgoin, Steven K. Freeburne, Roland L. Halm, Brian M. Naasz, David S. Niswonger, Dennis G. VanKoevering
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Patent number: 5045621Abstract: A diorganopolysiloxane in which a polymerizable functional group is present at one (or both) molecule chain ends and in which an arbitrary group is present at the other end can be easily synthesized. The synthesis involves the opening of a cyclotrisiloxane using an alkali metal silanolate which bears the polymerizable functional group, followed by a capping reaction. The resulting diorganopolysiloxane can be used effectively as a feed material for manufacturing silicone rubbers, feed material for manufacturing novel grafted organopolysiloxanes, comonomer components for resins other than organopolysiloxanes or plastics, etc.Type: GrantFiled: September 26, 1989Date of Patent: September 3, 1991Assignee: Toray Silicone Company, Ltd.Inventor: Toshio Suzuki
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Patent number: 5013809Abstract: Organosilicon prepolymer compositions which are the reaction products of (a) at least one of cyclic polysiloxanes or tetrahedral siloxysilanes containing at least two .tbd.SiH groups and (b) polycyclic polyenes having at least two non-aromatic, non-conjugated carbon-carbon double bonds in their rings, wherein the total ratio of the non-aromatic, non-conjugated carbon-carbon double bonds in the rings of (b) to .tbd.SiH groups in (a) in greater than 1.8:1 and either the .tbd.SiH containing compounds (a) or the polycyclic polyenes (b) have more than two reactive sites. The organosilicon compositions are blended with (c) at least one of additional cyclic polysiloxanes, additional tetrahedral siloxysilanes or linear, short chain .tbd.SiH terminated polysiloxanes to make fluid hydrosilation compositions. These storable blends are polymerized to thermally stable thermoset polymers.Type: GrantFiled: October 10, 1989Date of Patent: May 7, 1991Assignee: Hercules IncorporatedInventor: Raymond T. Leibfried, Sr.
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Patent number: 4992573Abstract: A rhodium colloid has been found to be a superior catalyst for the hydrosilylation of silicon hydride having two or three hydrogens attached to silicon. The rhodium colloid is made by effecting reaction between rhodium trichloride and certain silicon hydride.Type: GrantFiled: April 13, 1990Date of Patent: February 12, 1991Assignee: General Electric CompanyInventor: Larry N. Lewis
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Patent number: 4962221Abstract: The instant invention is a process for reducing residual chloride content of polysiloxane fluids, without detrimental effects on the polysiloxane polymer. The process comprises contacting the polysiloxane fluid, containing residual chloride, with selected weakly-basic alkaline metal compounds at a temperature less than 100.degree. C. After an appropriate contact time, the polysiloxane fluid is separated from the solid alkaline metal compounds. In a preferred embodiment of the present invention, water is added to the process to facilitate removal of residual chloride.Type: GrantFiled: March 12, 1990Date of Patent: October 9, 1990Assignee: Dow Corning CorporationInventors: Arnold R. Huntress, Daryl D. Landis, Donald E. McVannel, Timothy Allen
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Patent number: 4950779Abstract: A nonaqueous method is provided for making silicone oligomers by using stoichiometric amounts of formic acid to effect the condensation of polyalkoxysilanes or polayminosilanes. Reaction can be effected under ambient conditions.Type: GrantFiled: December 4, 1989Date of Patent: August 21, 1990Assignee: General Electric CompanyInventors: Jeffrey H. Wengrovius, Virginia M. VanValkenburgh
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Patent number: 4918197Abstract: A method is provided for silylating aromatic acylhalide by effecting reaction between an aromatic acylhalide and halogenated polysilane in the presence of an effective amount of a supported transition metal catalyst, such as a transition metal catalyst supported by an organic or inorganic substrate.Type: GrantFiled: August 15, 1988Date of Patent: April 17, 1990Assignee: General Electric CompanyInventors: Jonathan D. Rich, Terry E. Krafft, Philip J. McDermott
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Patent number: 4895967Abstract: A method is provided for making cyclic poly(siloxane) by incrementally contacting linear polysilxoane with a fixed bed cracking catalyst, such as an acidic Zeolite under reduced pressure. The resulting volatile cyclic poly(siloxane) is then recovered.Type: GrantFiled: September 26, 1988Date of Patent: January 23, 1990Assignee: General Electric CompanyInventors: James V. Crivello, Julia L. Lee
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Patent number: 4874868Abstract: Novel volatile silicon compounds are disclosed which are very suitable for use in cosmetic and household products.Type: GrantFiled: March 16, 1988Date of Patent: October 17, 1989Assignee: The Procter & Gamble CompanyInventor: Raymond E. Bolich, Jr.
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Patent number: 4824985Abstract: The present invention relates to a process for the preparation of alkoxy, aryloxy, alkyl, and aryl cyclotetrasiloxanes from a metal silicate halide salt, Ca.sub.8 Si.sub.4 O.sub.12 Cl.sub.8.Type: GrantFiled: June 11, 1987Date of Patent: April 25, 1989Assignee: Dow Corning CorporationInventors: George B. Goodwin, Malcolm E. Kenney
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Patent number: 4780554Abstract: Novel O-silylated ketene acetals and enol ethers are prepared via the 1,4-hydrosilation of a hydrosilation composition selected from the group consisting of aminosilanes, siloxanes and alkylalkoxysilanes with an .alpha.,.beta.-unsaturated carbonyl in the presence of a rhodium catalyst.Type: GrantFiled: June 6, 1985Date of Patent: October 25, 1988Assignee: Union Carbide CorporationInventors: Jennifer M. Quirk, Linda K. Kozak, Bernard Kanner
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Patent number: 4780519Abstract: During the polymerization of diorganocyclosiloxane, to produce a polymer for use in manufacturing silicone rubber, a small amount of --SiOH is formed. The amount of --SiOH present in the polymer can be controlled by controlling the water vapor pressure present in the reaction container during polymerization.Type: GrantFiled: December 7, 1987Date of Patent: October 25, 1988Assignee: Dow Corning CorporationInventors: John C. Saam, Leo F. Stebleton
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Patent number: 4772737Abstract: Admixtures of cyclic and linear diorganopolysiloxanes, relatively rich in cyclic species, are produced by hydrolyzing a diorganodichlorosilane, in an aqueous hydrochloric acid medium, in the presence of an effective amount of at least one amphoteric surface-active agent, characteristically at least one compound of the formula: ##STR1## The medium of hydrolysis is facilely separated into an aqueous phase and a cyclic oligomer-enriched siloxane phase essentially devoid of surfactant(s).Type: GrantFiled: October 23, 1987Date of Patent: September 20, 1988Assignee: Rhone-Poulenc ChimieInventors: Francoise Lartigue-Peyrou, Hugues Porte
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Patent number: 4764631Abstract: A process for preparing a product cyclopolydiorganosiloxane, (R.sub.2 SiO).sub.c. The process comprises (A) vaporizing a feed cyclopolydiorganosiloxane material, (R.sub.2 SiO).sub.x ; (B) passing the vapors from (A) through a heated bed of a solid catalyst, the catalyst comprising an alkali metal compound; (C) controlling pressure and temperature in the heated catalyst bed to favor formation of (R.sub.2 SiO).sub.c in an equilibrating mixture with other cyclopolydiorganosiloxanes; and (D) recovering an amount of the product cyclopolydiorganosiloxane, (R.sub.2 SiO).sub.c, which is substantially increased from the amount present in the feed cyclopolydiorganosiloxane material.Type: GrantFiled: January 15, 1988Date of Patent: August 16, 1988Assignee: Dow Corning CorporationInventors: Roland L. Halm, Sidney A. Hansen, Charles E. Neal, Jr.
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Patent number: 4719024Abstract: The invention relates to methylalkylcyclosiloxanes wherein each silicon atom in the siloxane ring has a methyl attached and each siloxane ring has at least two different non-methyl alkyl groups. The methylalkylcyclosiloxanes display a wide range of viscosity and thermal stability.Type: GrantFiled: May 5, 1986Date of Patent: January 12, 1988Assignee: Dow Corning CorporationInventors: John L. Speier, James R. Malek
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Patent number: 4709054Abstract: A method is provided for silylating organic substrates, utilizing a halogenated polysilane, such as 1,1,2,2-tetrachloro dimethyldisilane and an aromatic acyl halide, for example, trimellitic anhydride acid chloride in the presence of a transition metal catalyst.Type: GrantFiled: August 13, 1985Date of Patent: November 24, 1987Assignee: General Electric CompanyInventor: Jonathan D. Rich
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Patent number: 4689420Abstract: What is disclosed is a process for converting polydiorganosiloxanes to cyclopolydiorganosiloxanes with reduced cleavage of organic groups from silicon atoms. The process comprises (A) feeding a mixture of the polydiorganosiloxanes, a catalyst, and an organic solvent to a device in which water is formed as the polydiorganosiloxanes react in the presence of the catalyst and the organic solvent, the water formed being driven out of said device as a two-phase organic solvent/water azeotrope; (B) reacting the polydiorganosiloxane/catalyst/organic solvent mixture from (A), essentially free of water, to convert the polydiorganosiloxanes to the desired product cyclopolydiorganosiloxanes; and (C) recovery of the desired product cyclopolydiorganosiloxanes.Type: GrantFiled: November 19, 1985Date of Patent: August 25, 1987Assignee: Dow Corning CorporationInventors: Gnaneshwar R. Baile, Jane A. Crompton, Daniel F. McMahon
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Patent number: 4681963Abstract: A colloidal hydrosilylation catalyst is provided by effecting reaction between a silicon hydride or a siloxane hydride and a Pt(O) or Pt(II) catalyst. The colloidal catalyst forms stable mixtures with olefinically unsaturated organopolysiloxanes.Type: GrantFiled: December 9, 1986Date of Patent: July 21, 1987Assignee: General Electric CompanyInventor: Larry N. Lewis
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Patent number: 4649220Abstract: Disclosed is a process for the performance of organic reactions in the liquid phase wherein silicone oils are used as the reaction medium. These silicone oils have no functional groups, are liquid at room temperature and have viscosities between 40 and 20,000 cs. at 25.degree. C. The obtained reaction products are very pure and generally do not require additional purifying operations.Type: GrantFiled: July 26, 1985Date of Patent: March 10, 1987Assignee: Dynamit Nobel AGInventors: Hans P. Suerken, Jurgen Amort, Horst Hanisch, Hendrikus van der Maas