Two Silicons Bonded Directly To The Same Oxygen Patents (Class 556/434)
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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: 5272243Abstract: The linear organosilicon compounds of this invention contain at least two silicon-bonded hydrogen atoms at one of the two terminal positions of the molecule and at least two silicon-bonded hydrolyzable groups at the other terminal position. The compounds are useful as intermediates for preparing organosilicon compounds containing at least two organofunctional groups in each molecule.Type: GrantFiled: July 24, 1992Date of Patent: December 21, 1993Assignee: Dow Corning Toray Silicone Co., Ltd.Inventors: Hisataka Nakashima, Tadashi Okawa
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Patent number: 5262506Abstract: There is described an organopolysiloxane which contains at least 2 amino groups, carboxyl groups, hydroxyl groups, or epoxy-functional organic groups at one and only one molecular chain terminal, as well as a method for the preparation of same. The organopolysiloxane has the formula ##STR1## wherein R is a monovalent hydrocarbon group which is free of aliphatically unsaturated bonds and wherein the groups R may be identical or different; A' is selected from the group consisting of groups, the carboxyl group, the hydroxyl group, and epoxy-functional organic groups; B is the same or a different divalent organic group having at least 2 carbon atoms; m is zero or one; and n is an integer with a value of zero to 200.Type: GrantFiled: April 20, 1992Date of Patent: November 16, 1993Assignee: Dow Corning Toray Silicone Co., Ltd.Inventors: Tadashi Okawa, Shuji Yamada
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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: 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: 5200543Abstract: Novel siloxane compounds containing a SiH group, an alkoxy or epoxy group-containing organic group attached to a silicon atom, and a perfluoropolyether group-containing organic group, each at least one per molecule, are useful tackifiers for imparting good adhesion to various resins and even fluorinated silicone resins.Type: GrantFiled: July 2, 1992Date of Patent: April 6, 1993Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Hiroshi Inomata, Hiromasa Yamaguchi, Kenichi Fukuda
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Patent number: 5196558Abstract: Novel siloxane compounds are provided which have 1-5 hydrogen atoms each attached to a silicon atom (SiH group) and 1-5 epoxy or alkoxy - containing organic groups each attached to a silicon atom in a molecule. These siloxane compounds are useful tackifiers to conventional resins, have good affinity to fluorinated silicone resins and rubbers so that they impart adhesion to fluorinated silicone resins and rubbers, and contribute to solvent resistance and minimal moisture permeability.Type: GrantFiled: August 6, 1992Date of Patent: March 23, 1993Assignee: Shin-Etsu Chemical Company, LimitedInventors: Hiroshi Inomata, Yasushi Yamamoto, Yasuo Tarumi, Kenichi Fukuda
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Patent number: 5191102Abstract: A process of producing a silethylene oxide represented by the following general formula (1): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 each represent a hydrocarbon group having 1 to 8 carbon atoms such as a methyl group, comprising the steps of thermally decomposing the hydrolyzate of 1,4-dichloro-1,1,4,4-tetrahydrocarbyl-1,4-disilabutane in the presence of an alkali, bringing the thermally decomposed product in contact with carbon dioxide and distilling the reaction mixture. According to this process, in the distillation, since polymerization or formation of 2,5-disilahexane-2,5-diol can be obviated, a purified silethylene oxide can be obtained in high yield. Further, the distillation apparatus will not be clogged with by-products.Type: GrantFiled: July 15, 1992Date of Patent: March 2, 1993Assignee: Shin-Etsu Chemical Co. Ltd.Inventors: Masayuki Oyama, Kenichi Fukuda, Yasushi Yamamoto, Noriyuki Koike
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Patent number: 5158702Abstract: The present invention relates to compounds of the formula ##STR1## in which Z is a radical bonded to the benzene ring in the 2-, 3-, 5- or 6-position, namely a halogen atom, a cyano group or a hydroxyl group,n is 0, 1 or 2,R" is a radical of the formulaR'''--[Si(R*).sub.2 ](CH.sub.2).sub.y R""-- (9),in whichY is an integer from 4 to 18,R''' is as defined in the description,R* is identical or different, optionally substituted C.sub.1 - to C.sub.18 -hydrocarbon or hydrocarbonoxy radicals,R"" is a radical of the formula --(E).sub.z -- which is optionally bonded to the carboxy group via a phenylene or biphenylene radical, whereE is a divalent radical of the formula --O-- or --Si(R*).sub.2 --, andZ is the number 0 or 1, and the radicalR' is a halogen atom, a cyano radical, a cholesteryl radical, a radical as defined for R* or of the formula --C.sub.6 H.sub.4 --R**, andR** may have any meaning of R*, with the exception of an n-octyloxy or an n-decyloxy radical,and the preparation and use thereof.Type: GrantFiled: June 22, 1990Date of Patent: October 27, 1992Assignee: Consortium fur Elektrochemische Industrie GmbHInventors: Wolfgang Haas, Norman Haberle, Rainer Winkler, Franz-Heinrich Kreuzer
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Patent number: 5153332Abstract: An organocyclosiloxane is disclosed which has both silicon-bonded alkoxy groups and organofunctional groups within each molecule. This cyclic siloxane finds utility as a coupling agent and has the general formula ##STR1## wherein R.sup.1 is independently selected from the group consisting of a monovalent hydrocarbon group having 1 to 8 carbon atoms and a monovalent halogen-substituted hydrocarbon group having 1 to 8 carbon atoms, 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 groups, methacryloxyalkyl groups, N-(trialkylsilyl)aminoalkyl groups, (hydroxyphenyl)alkyl groups, and haloalkyl groups and n and m each represent an integer having a value of 1 to 6 with the proviso that n+m is an integer with a value of 3 to 8.Type: GrantFiled: September 10, 1991Date of Patent: October 6, 1992Assignee: Dow Corning Toray Silicone Company, Ltd.Inventors: Hiroji Enami, Shoji Akamatsu
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Patent number: 5136068Abstract: The specification discloses an organopolysiloxane-polyoxyalkylene emulsifier for polar in nonpolar liquid emulsions wherein organopolysiloxane-polyoxyalkylene polymer molecules are intentionally cross linked through a cross linking agent joined thereto by nonhydrolyzable bonds and being free of internal hydrolyzable bonds.Type: GrantFiled: April 26, 1989Date of Patent: August 4, 1992Assignee: Dow Corning CorporationInventors: Bradley C. Bahr, Peter Y. Lo, A. Wade Lomas, David J. Romenesko
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Patent number: 5117025Abstract: The present polysilethylenesiloxane is a liquid polymer represented by the following general formula: ##STR1## wherein R.sup.1 and R.sup.2 each represent a lower alkyl group and R.sup.3 and R.sup.4 each represent a perfluoroalkylethyl group, and n is an integer of 10 to 1,000. This polymer is quite useful as a major component of elastomer compositions having chemical resistance, electrical properties, and high strength.Type: GrantFiled: July 5, 1991Date of Patent: May 26, 1992Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Toshio Takago, Hirofumi Kishita, Hitoshi Kinami, Kenichi Fukuda, Shinich Sato, Koichi Yamaguchi, Shuji Suganuma
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Patent number: 5087720Abstract: A polysilethylenesiloxane having the following formula: ##STR1## wherein R.sup.1 and R.sup.2 are each a methyl group or a perfluoroalkyl group. The polysilethylenesiloxane has excellent resistance to acid, alkali, etc., and are curable to produce rubber products having excellent mechanical strength.Type: GrantFiled: July 5, 1991Date of Patent: February 11, 1992Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Hirofumi Kishita, Shinichi Sato, Hitoshi Kinami, Toshio Takago, Kenichi Fukuda, Hirokazu Yamada
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Patent number: 5041591Abstract: The present invention provides an organohydrogenpolysiloxane which does not have an average chemical structure as encountered with organopolysiloxanes prepared by equilibration polymerization reactions, but rather which has a clear, defined chemical structure in which the position and number of silicon-bonded hydrogen groups is clearly defined. The organopolysiloxane has a branched structure in the vicinity of one terminal of the molecular chain and has the silicon-bonded hydrogen group at each of the resulting derivative terminals. The organopolysiloxanes can be addition-reacted with, for example, organic compounds having various functional groups to give organopolysiloxane having two organofunctional groups clustered at one terminal.Type: GrantFiled: August 15, 1990Date of Patent: August 20, 1991Assignee: Dow Corning Toray Silicone Company, Ltd.Inventor: Tadashi Okawa
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Patent number: 5026891Abstract: Surface active silicone compounds which have an improved stability at a pH above 9 or below 4, have the general formula ##STR1## wherein each R independently represents an alkyl or aryl group, each R' represents an alkylene group preferably separating neighbouring silicon atoms by up to 3 carbon atoms, each R" independently denotes R or, only if a is 0, the group R.sub.3 SiR'--, Z represents a hydrophilic sulphur, nitrogen or phosphor containing substituent or a carboxy-functional group or a salt thereof, and a has the value 0, 1 or 2.Type: GrantFiled: July 28, 1989Date of Patent: June 25, 1991Assignee: Dow Corning LimitedInventors: Andre R. L. Colas, Franck A. D. Renauld, George C. Sawicki
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Patent number: 5006584Abstract: A polymer is disclosed that is useful in increasing the viscosity of carbon dioxide. That polymer comprises a polydialkylsilalkylene polymer; wherein the dialkyl group is preferably dimethyl, methylethyl, or diethyl; and the alkylene group is preferably ethylene or methylene. Preferably, the polymer is polydimethylsilalkylene. That polymer can be used in a method for recovering oil from an underground oil-bearing earth formation penetrated by an injection well and a producing well, in which method carbon dioxide is injected into the formation to displace oil towards the producing well from which oil is produced to the surface. The viscosity of the carbon dioxide injected into the formation is increased at least three-fold by the presence of a sufficient amount of the polydialkylsilalkylene polymer and a sufficient amount of a cosolvent to form a solution of the polymer in the carbon dioxide.Type: GrantFiled: February 22, 1990Date of Patent: April 9, 1991Assignee: Chevron Research and Technology CompanyInventor: Bruce W. Davis
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Patent number: 4988470Abstract: Structures of inorganic fibers which may contain inorganic particles, flakes or powders, are prepared by adding aqueous silicone resin emulsions containing curing catalysts and emulsifiers to the fiber material, shaping the treated fiber material, and subsequently curing the silicone resin, in which salts or chelates of trivalent iron are employed as the curing catalysts. Iron (III) acetylacetonate is preferably employed as the curing catalyst. The structures are preferably produced in a continuous process in which the aqueous silicone resin emulsion is sprayed onto the fiber material, then the fiber material is compacted to the desired bulk density and the silicone resin is cured by contacting the compacted fiber material with hot gases. Curing of the silicone resin is preferably carried out at a temperature of from 150.degree. to 300.degree. C. over a period of from 5 to 8 minutes.Type: GrantFiled: May 12, 1989Date of Patent: January 29, 1991Assignee: Wacker-Chemis GmbHInventors: Ulrich Demlehner, Bernward Beubzer, Matthias Wolfgruber
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Patent number: 4985576Abstract: A bisindenyl derivate of the formula I ##STR1## (M.sup.1 =Si or Ge, R.sup.6 and R.sup.7 =unsubstituted or substituted idenyl radical)is obtained in very good yield by reacting a compound of the formula II ##STR2## (X=halogen) with a compound of the formula III or IVR.sup.6 -M.sup.2 (III) R.sup.7 -M.sup.2 (IV)(M.sup.2 =alkali metal)if, in the reaction, compound III or IV is added slowly to compound II.Compound I is suitable as a starting material for the preparation of metallocene catalyst components.Type: GrantFiled: December 29, 1989Date of Patent: January 15, 1991Assignee: Hoechst AktiengesellschaftInventors: Jurgen Rohrmann, Martin Antberg
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Patent number: 4971831Abstract: A novel organopolysiloxane compound is proposed which has, in a molecule, at least three (meth)acryloxy groups localized at only one of the molecular chain ends of the polysiloxane chain. By virtue of the localization of the (meth)acryloxy groups, the organopolysiloxane compound is highly curable by the irradiation with a radiation, e.g., electron beams and ultraviolet light, to give a cured coating film on a substrate surface exhibiting excellent releasability against sticky substances. A synthetic route for the preparation of such a one-end crosslinkable organopolysiloxane compound is described.Type: GrantFiled: April 10, 1990Date of Patent: November 20, 1990Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Toshio Ohba, Shinji Irifune
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Patent number: 4902731Abstract: A novel organosilicon prepolymer, which is the partial reaction product of (a) a cyclic polysiloxane or a tetrahedral siloxysilane containing at least two hydrosilane groups and (b) a polycyclic polyene having in its rings at least two chemically distinguishable carbon-carbon double bonds, wherein the ratio of carbon-carbon double bonds in the rings of (b) to hydrosilane groups in (a) is greater than 0.5:1 and up to 1.8:1, and at least one of the compounds (a) and (b) has more than two reactive sites, a method for making the organosilicon prepolymer, and a method for preparing an organosilicon polymer therefrom, are disclosed.Type: GrantFiled: August 16, 1988Date of Patent: February 20, 1990Assignee: Hercules IncorporatedInventor: Raymond T. Leibfried
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Patent number: 4900779Abstract: Novel thermoset and thermoplastic organosilicon polymers, comprised substantially of alternating polycyclic hydrocarbon residues and cyclic polysiloxane or tetrahedral siloxysilane residues linked through carbon-silicon bonds, are disclosed.Type: GrantFiled: July 30, 1987Date of Patent: February 13, 1990Assignee: Hercules IncorporatedInventor: Raymond T. Leibfried
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Patent number: 4888404Abstract: The method of this invention produces an elastomeric silicone sealant having an improved shelf life. The sealant comprises an alkoxysilethylene ended polydiorganosiloxane polymer, an alkoxytrialkoxysilane crosslinker, and a titanium catalyst.Type: GrantFiled: February 27, 1989Date of Patent: December 19, 1989Assignee: Dow Corning CorporationInventors: Jerome M. Klosowski, Michael D. Meddaugh
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Patent number: 4877820Abstract: Disclosed are novel, cross-linked or cross-linkable linear poly(organohydrosiloxanes) wherein the cross-linking units are derived from polycyclic polyenes. These polymers or prepolymers are prepared by reacting or partially reacting the poly(organohydrosiloxanes) with the polycyclic polyene in the presence of a catalyst.Type: GrantFiled: August 4, 1988Date of Patent: October 31, 1989Assignee: Hercules IncorporatedInventor: Patrick J. Cowan
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Patent number: 4871827Abstract: The method of this invention produces an elastomeric silicone sealant having an improved shelf life. The sealant comprises an alkoxysilethylene ended polydiorganosiloxane polymer, an alkoxytrialkoxysilane crosslinker, and a titanium catalyst.Type: GrantFiled: March 3, 1986Date of Patent: October 3, 1989Assignee: Dow Corning CorporationInventors: Jerome M. Klosowski, Michael D. Meddaugh
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Patent number: 4853474Abstract: The specification discloses an organopolysiloxane-polyoxyalkylene emulsifier for polar in nonpolar liquid emulsions wherein organopolysiloxane-polyoxyalkylene polymer molecules are intentionally cross linked through a cross linking agent joined thereto by nonhydrolyzable bonds and being free of internal hydrolyzable bonds.Type: GrantFiled: July 8, 1987Date of Patent: August 1, 1989Assignee: Dow Corning CorporationInventors: Bradley C. Bahr, Peter Y. Lo, A. Wade Lomas, David J. Romenesko
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Patent number: 4801725Abstract: An organosilicon compound represented by General Formula (I): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 may be the same or different, and each represent a substituted or unsubstituted monovalent hydrocarbon group, x and y each represent an integer of 1 to 3, and n is an integer of 0 or more.This compound is useful as a starting material for ultraviolet curable silicone compositions and room temperature curable silicone compositions.Type: GrantFiled: September 2, 1987Date of Patent: January 31, 1989Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Masatoshi Arai, Shinichi Satoh, Kazutoshi Fujioka
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Patent number: 4772675Abstract: The method of this invention produces an elastomeric silicone sealant having an improved shelf life. The sealant comprises an alkoxysilethylene ended polydiorganosiloxane polymer, an alkoxytrialkoxysilane crosslinker, and a titanium catalyst.Type: GrantFiled: January 28, 1988Date of Patent: September 20, 1988Assignee: Dow Corning CorporationInventors: Jerome M. Klosowski, Michael D. Meddaugh
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Patent number: 4705887Abstract: Aromatic polyvinylethers and active hydrogen compound reaction products thereof have been found to provide fast heat curable molding compositions when used with various heat activated curing catalysts, for example, diaryliodonium salts in combination with aromatic polyvinylether soluble copper compounds, or dialkylhydroxyarylsulfonium salts in combination with certain organic oxidants.Type: GrantFiled: April 1, 1985Date of Patent: November 10, 1987Assignee: General Electric CompanyInventor: James V. Crivello
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Patent number: 4645848Abstract: Phenylene group-containing organopolysiloxanes formed of a plurality of identical or different units represented by the structural formula: ##STR1## where in each case all three possible isomers in relation to the position of the SiO.sub.3/2 --R.sup.1 substituents on the phenylene group can be present concurrently, in which R.sup.1 stands for --CH.sub.2 --CH.sub.2 -- or CH.sub.3 --CH< and the free valences of the oxygen atoms are saturated by silicon atoms of other groups of formula (1) and/or by cross-linking bridge groups. A process for the preparation of these polysiloxanes and the use thereof for the synthesis of carriers of active substances is also disclosed.Type: GrantFiled: May 21, 1986Date of Patent: February 24, 1987Assignee: Degussa AktiengesellschaftInventors: Peter Panster, Peter Kleinschmit
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Patent number: 4645847Abstract: Functionalized phenylene group-containing organopolysiloxanes, comprising a plurality of identical or different units of the formula: ##STR1## where in each case all three possible isomers in relation to the position of the SiO.sub.3/2 --R.sup.1 substituents on the phenylene group can be present concurrently, in which the bridge groups R.sup.1 represent the groups --CH.sub.2 --CH.sub.2 -- or CH.sub.3 --CH<, X represents Cl, Br, CH.sub.2 Cl, P(C.sub.6 H.sub.5).sub.2, and Ch.sub.2 P(C.sub.6 H.sub.5).sub.2, and the free valences of the oxygen atoms are saturated by silicon atoms of other groups of formula (1) and/or by cross-linking agents. Also disclosed is a process for the preparation of said polysiloxanes.Type: GrantFiled: May 21, 1986Date of Patent: February 24, 1987Assignee: Degussa AktiengesellschaftInventors: Peter Panster, Peter Kleinschmit
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Patent number: 4579964Abstract: Novel alkoxysilyl functional silicones capable of imparting satisfactory lubricity and other properties such as softness to a variety of textile fabrics over an extended period of time under normal usage. The alkoxysilyl functional silicones include at least one functional group of the formula: ##STR1## wherein R is an alkyl or an acyl hydrocarbon radical having from one to four carbon atoms; R.sub.1 is an alkyl radical of from one to two carbon atoms or a mixture thereof; and w is an interger of from 2 to about 20.Type: GrantFiled: March 31, 1983Date of Patent: April 1, 1986Assignee: Union Carbide CorporationInventors: George E. Totten, Arthur N. Pines
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Patent number: 4525400Abstract: The adhesion of self-bonding, low modulus, one package, room temperature vulcanizable silicone compositions to a variety of substrates is effectively promoted by incorporating in the silicone composition, before curing, a small effective amount of an adhesion promoting composition comprising predominantly at least one diorganocyclopolysiloxane compound of the formula: ##STR1## wherein R.sup.1 may be C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 gamma-trihaloalkyl or phenyl; R.sup.2 is alkylene of from 2 to 6 carbon atoms; R.sup.3, R.sup.4 and R.sup.5 are, independently, C.sub.1 -C.sub.6 alkyl or C.sub.2 -C.sub.6 alkanoyl; and n is either 3 or 4.Type: GrantFiled: May 25, 1984Date of Patent: June 25, 1985Assignee: General Electric CompanyInventor: Richard P. Surprenant
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Patent number: 4367216Abstract: Compounds of the formula ##STR1## wherein R.sup.1 is hydroxy-C.sub.2-8 -alkyl containing 1-5 OH-groups;R.sup.2 is hydrogen, C.sub.1-4 -alkyl or R.sup.1 ;R.sup.3 and R.sup.4 can be identical or different, and each independently is hydrogen or C.sub.1-4 -alkyl; andX is straight chain or branched C.sub.2-12 alkylene interrupted by sulfur or selenium atoms, and, optionally, additionally interrupted by oxygen atoms, by a di(C.sub.1-4 -alkyl)silyl group or a tetra(C.sub.1-4 -alkyl)disiloxane group;are very useful as X-ray contrast media opaque agents, which can be employed even in lymphography.Type: GrantFiled: June 27, 1980Date of Patent: January 4, 1983Assignee: Schering AktiengesellschaftInventors: Wolfgang Mutzel, Hans-Martin Siefert, Ulrich Speck, Heinrich Pfeiffer, Paul-Eberhard Schulze, Bernhard Acksteiner
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Patent number: 4238402Abstract: Reactions of chlorosilanes and methoxysilanes with chlorosiloxanes, methoxysiloxanes and siloxanes are carried out in the presence of hydrochloric acid and methanol, without the addition of any catalyst, to provide methoxy-functional polysiloxane intermediate fluids. Improved yields are provided by utilizing the hydrolyzate forms of Me.sub.2 SiCl.sub.2 and MeHSiCl.sub.2, respectively, in order to obtain Me.sub.2 SiO and MeHSiO siloxane units.Type: GrantFiled: June 5, 1979Date of Patent: December 9, 1980Assignee: General Electric CompanyInventors: Harold J. Clayton, Theodore A. Kulpa, George F. Roedel
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Patent number: 4220600Abstract: A process for producing polycarbosilane partly containing siloxane bonds, ich comprises adding 0.01 to 15% by weight of polyborosiloxane having phenyl groups in at least a part of the side chains of Si with its skeletal structure being composed of B, Si and O to a polysilane having the structure ##STR1## wherein n is at least 3, and R.sub.1 and R.sub.2, independently from each other, represent methyl, ethyl, phenyl or hydrogen; and heating the polymer mixture in an atmosphere inert to the reaction thereby to polymerize it. The polycarbosilane has excellent properties, and is especially suitable as a raw material for the production of silicon carbide fibers.Type: GrantFiled: October 23, 1978Date of Patent: September 2, 1980Assignee: The Foundation: The Research Institute for Special Inorganic MaterialsInventors: Seishi Yajima, Kiyohito Okamura, Yoshio Hasegawa