Material Is A Metal-containing Material Patents (Class 528/14)
  • Patent number: 5605998
    Abstract: There is disclosed a method for producing polycarbosilanes, comprising polymerizing silane of the formula SiH.sub.4 with dienes in the presence of a rare earth metal complex. Polycarbosilanes useful as photoreactive materials and as raw material of silicon carbide-series ceramics can be obtained in a high yield from silane (SiH.sub.4) and dienes.
    Type: Grant
    Filed: March 9, 1995
    Date of Patent: February 25, 1997
    Assignee: Director-General of Agency of Industrial Science and Technology
    Inventors: Toshi-aki Kobayashi, Masato Tanaka
  • Patent number: 5605999
    Abstract: An anaerobically curing composition is comprised of (i) a silicone fluid formed as the reaction product of at least one first silane of formula I:R.sub.n Si(X).sub.4-n (I),wherein the R groups are the same or different and selected from the group consisting of hydrogen, C1-C12 alkyl, C6-C12 aryl, C7-C18 arylalkyl, C7-C18 alkylaryl, haloalkyl, haloaryl and monovalent ethylenically unsaturated radicals excluding (meth)acryloxy functional groups, X is a hydrolyzable functionality, and n is an integer of from 0 to 3, and at least one second silane of formula II:R.sup.1.sub.m R.sup.2.sub.p Si(X).sub.4-(m+p) (II),wherein R.sup.1 is a (meth)acrylic functional group and R.sup.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: February 25, 1997
    Assignee: Loctite Corporation
    Inventors: Hsien-Kun Chu, Richard D. Rich, I. David Crossan, Robert P. Cross
  • Patent number: 5567790
    Abstract: A highly efficient method for preparing a diphenylsiloxane-dimethylsiloxane copolymer having a narrow molecular weight distribution, said method comprising:(I) polymerizing(A) a mixture of hexamethylcyclotrisiloxane and hexaphenylcyclotrisiloxane, using as polymerization initiator(B) a lithium compound having the formula ##STR1## in which R independently denotes a monovalent hydrocarbon radical, X and X' are selected from the group consisting of hydrogen and lithium, with the proviso that one of X and X' must be lithium, and m is an integer having a value of at least 1, optionally, in the presence of(C) a molecular-weight regulator selected from the group consisting of water and a compound having the formula ##STR2## in which R has its previously defined meaning and p is an integer having a value of at least 1, said polymerization taking place in the presence of both(D) a nitrile compound and(E) an active hydrogen-free polar solvent; and(II) terminating the polymerization reaction product from step (I) with a
    Type: Grant
    Filed: July 14, 1995
    Date of Patent: October 22, 1996
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventor: Tadashi Okawa
  • Patent number: 5567789
    Abstract: A highly efficient method for preparing an organopolysiloxane which contains little low molecular weight organosiloxane is disclosed, said method comprising:(I) polymerizing(A) cyclic trisiloxane having the formula ##STR1## wherein R is a monovalent hydrocarbon radical, excluding aryl radical, using as a polymerization initiator(B) a lithium compound having the formula ##STR2## in which R' is independently selected from monovalent hydrocarbon radicals, X and X' are selected from the group consisting of hydrogen and lithium, with the proviso that one of X and X' must be lithium, and m is an integer having a value of at least 1, optionally, in the presence of(C) a molecular-weight regulator selected from the group consisting of water and a compound having the formula ##STR3## in which R' has its previously defined meaning and p is an integer having a value of at least 1,said polymerization taking place in the presence of both(D) a nitrile compound and(E) an active hydrogen-free polar solvent; and(II) terminatin
    Type: Grant
    Filed: July 14, 1995
    Date of Patent: October 22, 1996
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Ryuko Manzouji, Tadashi Okawa
  • Patent number: 5565540
    Abstract: The present invention pertains to a method for the preparation of organosiloxane oligomer with the general formulaR.sup.1.sub.3 SiO(R.sup.2.sub.2 SiO).sub.n Hwhere each R.sup.1 and R.sup.2 are independently monovalent hydrocarbon groups and n has a value of 1 to 10; wherein the method comprises cohydrolyzing a triorganohalosilane and diorganodihalosilane in the presence of a basic compound in a two-layer liquid system comprised of an aqueous layer and an organic solvent layer. The method of the instant invention is a high-yield method for the preparation of organosiloxane oligomer having the silicon-bonded hydroxyl group at only one molecular chain terminal.
    Type: Grant
    Filed: July 21, 1993
    Date of Patent: October 15, 1996
    Assignee: Dow Corning Toray Silicon Co., Ltd.
    Inventors: Tadashi Okawa, Shuji Yamada
  • Patent number: 5561210
    Abstract: A method for preparing a telechelic polydiene having at least 70% 1,4-microstructure and at least 70% of its end groups capped by silanol-terminated siloxane functionality is disclosed, said method comprising:(I) reacting, in a non-polar solvent solution,(A) at least one diene monomer,(B) a dianionic initiator which is soluble in said non-polar solvent and, optionally,(C) a polymerization adjuvant to form a dianionically active polydiene;(II) reacting said dianionically active polydiene from step (I) with(D) a cyclic siloxane, in the presence of(E) a promoter selected from the group consisting of an organic sulfoxide, a tertiary amide and mixtures thereof to cap both ends of said dianionically active polydiene; and(III) quenching the capped product from step (II).
    Type: Grant
    Filed: May 30, 1995
    Date of Patent: October 1, 1996
    Assignee: Dow Corning Corporation
    Inventor: Aroop K. Roy
  • Patent number: 5548009
    Abstract: A process for improving the storage life of a one-component silicone paste containing an alkali metal phosphate and which cures with elimination of acetic acid on exposure to atmospheric moisture, which comprises adding to such paste an acidic additive bearing the functional group --SO.sub.3 H or hydrogen chloride in a concentration sufficient to convene the alkali metal phosphate into the alkali metal salt of the acidic additive.
    Type: Grant
    Filed: April 26, 1994
    Date of Patent: August 20, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilhelm Weber, Karl-Heinz Sockel, Hans-Heinrich Moretto
  • Patent number: 5548053
    Abstract: The present invention relates to a process for the preparation of organopolysiloxane resins by hydrolysis and condensation of silanes and/or (partial) hydrolysates thereof.
    Type: Grant
    Filed: October 12, 1994
    Date of Patent: August 20, 1996
    Assignee: Wacker-Chemie GmbH
    Inventors: Richard Weidner, Konrad Mautner, Reinhardt Mueller
  • Patent number: 5534608
    Abstract: Linear triorganosiloxy-terminated polydiorganosiloxanes having a silanol content of less than about 200 ppm are prepared by condensing linear higher molecular weight polydiorganopolysiloxanediols having one Si-bonded hydroxyl group in each terminal unit and a silanol content of preferably greater than about 1000, in two separate stages, one using a fixed bed of a solid form of a conventional equilibration catalyst, and the other using a condensation/disproportionation catalyst, e.g., a phosphonitrilic halide or an oligomer thereof or a reaction product thereof with water, an alcohol, an acid, or a siloxane or silane, until the polydiorganosiloxane has reached the desired low content of silanol groups, e.g., below 200 ppm, by weight. The two stages can be carried out in either order, and a conventional monofunctional chain terminating agent can be present in either or both stages. The process preferably does not increase the cyclic byproduct content.
    Type: Grant
    Filed: January 30, 1995
    Date of Patent: July 9, 1996
    Assignee: General Electric Company
    Inventors: Dennis P. Thompson, Patricia P. Anderson, Donald Slick
  • Patent number: 5532288
    Abstract: Process for the preparation of a polysilane crosslinked by ioning radiation and process for the production of a composite material having a polysilane matrix. The preparation process consists of subjecting to ionizing radiation chosen from among X-rays and an electron bombardment, a formulation crosslinkable by ionizing radiation incorporating at least one polysilane having at least one vinyl termination.
    Type: Grant
    Filed: March 29, 1995
    Date of Patent: July 2, 1996
    Assignee: Aerospatiale Societe Nationale Industrille
    Inventors: Daniel Beziers, Evelyne Chataignier, Patrick Noireaux
  • Patent number: 5527872
    Abstract: There is provided electronic devices with dielectric layers obtained from boron-oxide doped, spin-on glass formulations which form glassy layers with high oxygen resistance. Suitable electronic devices include integrated circuits. With high oxygen resistance, the glassy layer formed maintains its integrity in subsequent processing. Also provided is a method for preparing boron-oxide doped, spin-on glass formulations with a high carbon content having a silane adhesion promoter and boron-dopant incorporated therein.
    Type: Grant
    Filed: March 17, 1994
    Date of Patent: June 18, 1996
    Assignees: AT&T Global Information Solutions Company, Hyundai Electronics America, Symbios Logic Inc.
    Inventor: Derryl D. J. Allman
  • Patent number: 5516871
    Abstract: There is disclosed a diphenylsiloxane oligomer functionalized at both terminals and methods for the preparation thereof, said oligomer having the following general formulaG-(OSiPh.sub.2).sub.m O-G (i)wherein Ph denotes a phenyl radical, m is 3 to 50 and G has a formula independently selected from the group consisting of ##STR1## in which R, R.sup.4 and R.sup.5 are independently selected from the group consisting of methyl, phenyl and R.sup.1, R.sup.1 is selected from the group consisting of hydrogen and a monovalent hydrocarbon group having 2 to 8 carbon atoms excluding phenyl, tolyl, xylyl, and ethylphenyl radicals, Q is a divalent hydrocarbon group and k is independently 0 to 3 at each terminus of said oligomer with the proviso that k is >0 at one terminus of said oligomer, at least one substituent among R, R.sup.4 and R.sup.5 in formula (ii) is R.sup.1 and, when both R.sup.4 and R.sup.5 groups at one terminus of said oligomer are phenyl, groups R.sup.4 and R.sup.
    Type: Grant
    Filed: March 21, 1995
    Date of Patent: May 14, 1996
    Assignee: Dow Corning Asia, Ltd.
    Inventors: Brian R. Harkness, Mamoru Tachikawa
  • Patent number: 5516868
    Abstract: A vinyl copolymer is provided comprising a silanol group-containing (meth)acryl siloxane unit of formula (1): ##STR1## wherein R.sup.1 is hydrogen or methyl, R.sup.2, R.sup.3, and R.sup.4 are independently a monovalent C.sub.1 -C.sub.8 hydrocarbon group or a siloxy group, R.sup.5 is a monovalent C.sub.1 -C.sub.8 hydrocarbon group, n=1 to 12, and a=0 or 1. The vinyl copolymer is prepared by copolymerizing a polymerizable vinyl monomer with a silanol group-containing (meth)acryl siloxane in the presence of a radical initiator or by emulsion polymerizing a polymerizable vinyl monomer with a silanol group-containing (meth)acryl siloxane in an aqueous medium in the presence of a surfactant and a polymerization initiator. The copolymer is blended with a condensation catalyst to form a room temperature curable resin composition which crosslinks in the presence of moisture into a cured coating having weatherability, flexibility, and adherence.
    Type: Grant
    Filed: June 30, 1995
    Date of Patent: May 14, 1996
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Toshio Yamazaki, Shinichi Morioka, Nobuyuki Syzuki, Ichinobe Shoji
  • Patent number: 5512650
    Abstract: Block copolymers having a repeating unit comprised of polysiloxane and urea segments are prepared by copolymerizing certain diaminopolysiloxanes with diisocyanates. The invention also provides novel diaminopolysiloxanes useful as precursors in the preparation of the block copolymers and methods of making such diaminopolysiloxanes. Pressure sensitive adhesive compositions comprising the block copolymer are also provided as are sheet materials coated with the same.
    Type: Grant
    Filed: July 21, 1993
    Date of Patent: April 30, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Charles M. Leir, Jerome J. Hoffman, Leonard A. Tushaus, Gary T. Wiederholt, Mjeczyslaw H. Mazurek, Audrey A. Sherman, William R. Bronn
  • Patent number: 5512605
    Abstract: Epoxysilicone polyether block copolymers, when combined with certain sulfonium photocatalysts, provide one-component shelf-stable UV curable compositions. Non-polyether containing epoxy silicones form one part UV curable compositions with sulfonium salt solubilized in the presence of fluoroalcohols.
    Type: Grant
    Filed: December 28, 1994
    Date of Patent: April 30, 1996
    Assignee: General Electric Company
    Inventors: Richard P. Eckberg, Michael J. O'Brien
  • Patent number: 5504177
    Abstract: Copolysiloxanecarbonates are prepared in the melt by the reaction of a diaryl carbonate such as diphenyl carbonate with a mixture of a dihydroxyaromatic compound and a carbonate-terminated polydiorganosiloxane, the latter typically prepared by reaction of a diaryl carbonate or aryl chloroformate with a hydroxyorgano-terminated polydiorganosiloxane. By this method, incorporation of silicone units in the copolysiloxanecarbonate is maximized.
    Type: Grant
    Filed: March 2, 1995
    Date of Patent: April 2, 1996
    Assignee: General Electric Company
    Inventors: Joseph A. King, Jr., Patrick J. McCloskey, Gary C. Davis
  • Patent number: 5496961
    Abstract: Organosilicon compounds having Si-bonded hydrogen atoms are reacted with organic compounds having aliphatic multiple bonds in the presence of triazene oxide-transition metal complexes. The triazene oxide-transition metal complexes are activated by heating at temperatures of from 50.degree. C. to 250.degree. C. and/or by irradiation with light.
    Type: Grant
    Filed: May 10, 1995
    Date of Patent: March 5, 1996
    Assignee: Wacker-Chemie GmbH
    Inventors: Jochen Dauth, Josef Wolferseder, Bernward Deubzer
  • Patent number: 5492993
    Abstract: Strain-crystallizing poly{methyl(3,3,3-trifluoropropyl)siloxane} elastomers and methods for their making. The process comprises the cross-linking of cis stereoregular polymers prepared by reacting isomers of 1,3,5-trimethyl-1,3,5-tris(3',3',3'-trifluoropropyl)cyclotrisiloxane, where at least 30 percent of the isomers are of cis configuration, in the presence of an aprotic polar promoter and a lithium compound. The lithium compound initiates ring opening and polymerization of the isomers without affecting the steric arrangement of the leomars. Elastomers prepared by cross-linking these cis stereoregular polymers have sufficient cis 3,3,3-trifluoropropyl substitution to allow the elastomers to strain crystallize and provide reinforcement to the elastomers at typical use temperatures.
    Type: Grant
    Filed: February 3, 1994
    Date of Patent: February 20, 1996
    Assignee: Dow Corning Corporation
    Inventors: John C. Saam, Chung M. Kuo
  • Patent number: 5492992
    Abstract: A process for making liquid polymers by condensing monomers and/or oligomers, mixing them with a catalyst where required, and dispersing the mixture via an atomizing device to form small droplets suspended in a reaction chamber. The reagents are caused to polymerize in the dispersed state. The process is preferably carried out in a spray dryer using an atomizing device and is particularly useful for polymerizing organosilicon compounds by condensation.
    Type: Grant
    Filed: December 5, 1994
    Date of Patent: February 20, 1996
    Assignee: Dow Corning S.A.
    Inventor: Jean M. Gilson
  • Patent number: 5491203
    Abstract: This invention relates to a polyorganosiloxane comprising a polymethylsilsesquioxane structure as a main structural unit and having a methyl group and a reactive group at the side chains thereof, which is suitable as a polymer modifier; a process for producing the same; a copolymer resin obtained by polymerizing the polyorganosiloxane with a polymerizable monomer or by reacting the polyorganosiloxane with a polymer; a method for crosslinking the copolymer resin; and a coating composition containing the copolymer resin.
    Type: Grant
    Filed: September 8, 1994
    Date of Patent: February 13, 1996
    Assignee: Showa Denko K. K.
    Inventors: Fumio Matsui, Nobuo Uotani, Masatoshi Murakami, Yuji Itoh
  • Patent number: 5489662
    Abstract: A process for the preparation of an organosilicon polymer, which comprises reacting one equivalent of a bis(alkoxysilyl) compound represented by the following general formula:R.sup.1 R.sup.2 R.sup.3 Si--(A).sub.p --SiR.sup.1 R.sup.2 R.sup.3wherein R.sup.1, R.sup.2 and R.sup.3 each represents the same or different substituted or unsubstituted monovalent hydrocarbon group or an alkoxy group, with the proviso that at least one of R.sup.1, R.sup.2 and R.sup.3 is an alkoxy group; A represents a divalent aromatic group, a divalent conjugated or nonconjugated unsaturated aliphatic group, or a divalent saturated aliphatic group; and p represents an integer of 1 or more, with one or more equivalents of an alkoxydisilane represented by the following general formula:(OR.sup.4).sub.6-n Si.sub.2 (R.sup.5).sub.nwherein R.sup.4 and R.sup.
    Type: Grant
    Filed: August 31, 1994
    Date of Patent: February 6, 1996
    Assignee: Toshiba Silicone Co., Ltd.
    Inventors: Shigeru Wakamatsu, Keiji Kabeta, Takafumi Imai
  • Patent number: 5484871
    Abstract: The invention relates to organopolysiloxanes containing hydrophilic groups, processes for their preparation and their use in organopolysiloxane compositions which are crosslinkable upon intake of moisture.
    Type: Grant
    Filed: September 1, 1994
    Date of Patent: January 16, 1996
    Assignee: Wacker-Chemie GmbH
    Inventor: Michael Stepp
  • Patent number: 5475076
    Abstract: The invention relates to organo(poly)siloxane compositions which have long shelf life in the absence of water, but can be crosslinked in the presence of water, even at room temperature, to give elastomers with elimination of alcohols, and to a process for the preparation of such compositions.
    Type: Grant
    Filed: July 29, 1994
    Date of Patent: December 12, 1995
    Assignee: Wacker-Chemie GmbH
    Inventors: Rudolf Braun, Petra Absmaier
  • Patent number: 5475077
    Abstract: A silanol-terminated diorganopolysiloxane can be reproducibly imparted with a viscosity as desired by the alkali-catalyzed ring-opening or siloxane rearrangement reaction from a cyclic or linear-chain diorganosiloxane oligomer by conducting, instead of exactly controlling the water content in the starting reaction mixture as in the prior art method, the reaction at least in the latter stage thereof under a controlled water-vapor pressure until neutralization of the alkali catalyst after equilibrium of the reaction has been reached according to the discovery that the viscosity or degree of polymerization of the silanol-terminated diorganopolysiloxane is a function of the water-vapor pressure, under which the reaction is brought into equilibrium, at the respective temperature.
    Type: Grant
    Filed: February 27, 1991
    Date of Patent: December 12, 1995
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Makoto Sato, Masaaki Furuya, Masao Maruyama
  • Patent number: 5464917
    Abstract: A straight-chain organopolysiloxane represented by the general formula: ##STR1## wherein R.sup.1 represents a monovalent hydrocarbon group, R.sup.2 represents a bivalent organic group, Rf represents a perfluoroalkyl ether group or a perfluoroalkyl group, X represents a hydrogen atom or an organosilyl group, and n is an integer of 15 to 4,000 and having a content of cyclic polysiloxanes with a molecular weight of 3,000 or below of 50 ppm or below. This organopolysiloxane is novel in that the content of cyclic siloxanes with a molecular weight of 3,000 or below is only 50 ppm or below and the organopolysiloxane can obviate contact failure due to volatilization of components or surrounding contamination due to bleeding when used as materials in the field of electricity and electronics or as building materials.
    Type: Grant
    Filed: August 1, 1994
    Date of Patent: November 7, 1995
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Hirofumi Kishita, Kouichi Yamaguchi, Nobuyuki Kobayashi, Kouichi Ishida
  • Patent number: 5461134
    Abstract: Block copolymers having a repeating unit comprised of polysiloxane and urea segments are prepared by copolymerizing certain diaminopolysiloxanes with diisocyanates. The invention also provides novel diaminopolysiloxanes useful as precursors in the preparation of the block copolymers and a method of making such diaminopolysiloxanes. Pressure sensitive adhesive compositions comprising the block copolymer are also provided as are sheet materials coated with the same.
    Type: Grant
    Filed: December 5, 1994
    Date of Patent: October 24, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Charles M. Leir, Jerome J. Hoffman
  • Patent number: 5457166
    Abstract: A process for preparing a polyester-modified silicone resin comprises mixing an alkoxysilane and/or its hydrolyzate, i.e. an alkoxysiloxane, and a polyester resin having at least two hydroxyl groups in the molecule, and subjecting the mixture to hydrolysis and polycondensation reactions in the presence of an acid catalyst. This process is performed by a continuous one-stage reaction sequence including hydrolysis, polycondensation and modification and is simplified. A composition comprising the polyester-modified silicone resin is also described. The composition comprising organozinc compounds along with the modified silicone resin is significantly improved in heat resistance and color-difference.
    Type: Grant
    Filed: July 21, 1994
    Date of Patent: October 10, 1995
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Yuji Yoshikawa, Tadashi Takahashi, Mitsuhiro Takarada
  • Patent number: 5457220
    Abstract: The present invention relates to a new silicone cure system. More particularly, the present invention discloses that a siloxane system containing sufficiently high levels of T or Q species in addition to M, D and a limited amount of silanol species can be cured by linear phosphonitrilic chloride disproportionation catalyst.
    Type: Grant
    Filed: April 29, 1994
    Date of Patent: October 10, 1995
    Assignee: General Electric Company
    Inventor: John S. Razzano
  • Patent number: 5442011
    Abstract: Novel polymeric fluorocarbon siloxane represented by the formula: ##STR1## and corresponding polymeric branched structures wherein R.sub.a is a perfluoroalkyl radical, R.sub.b is an aminoalkyl or substituted aminoalkyl radical and R.sub.c hydrocarbyl, substituted hydrocarbyl phenyl, substituted phenyl or cyanoalkyl radical are shown to form stable aqueous emulsions without the use of volatile organic solvents and by a low energy processing. These emulsion are found to be highly hydrolyzed in solution without leading to precipitation via intermolecular condensation The emulsions when applied to substrates impart both oil and water repellent properties as well as improved lubricity.
    Type: Grant
    Filed: March 4, 1994
    Date of Patent: August 15, 1995
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Robert A. Halling
  • Patent number: 5417867
    Abstract: A fiber treating agent which is a silicone modified polyester in which a polyester has a polyoganosiloxane grafted thereto. The grafted polyester is the reaction product of an allyl ether containing polyester and a polyorganosiloxane wherein at least one of the silicon atoms of the polyorganosiloxane has a hydrogen atom attached thereto. Preferably, the hydrogen atom is attached to one terminal end of the polyorganosiloxane. The reaction product is modified by reacting the reaction product with a polycarboxylic anhydride, and the amine salt of the modified reaction product may be formed by reacting the modified reaction product with an aminoalkylalkoxysilane. Methods of treating fibrous materials are also described.
    Type: Grant
    Filed: October 4, 1993
    Date of Patent: May 23, 1995
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Ryuzo Mikami, Isao Ona
  • Patent number: 5412055
    Abstract: 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: Grant
    Filed: April 18, 1994
    Date of Patent: May 2, 1995
    Assignee: Hercules Incoporated
    Inventor: De-Kai Loo
  • Patent number: 5408025
    Abstract: Linear triorganosiloxy-terminated polydiorganosiloxanes having a silanol content of less than about 200 ppm are prepared by condensing linear higher molecular weight polydiorganopolysiloxanediols having one Si-bonded hydroxyl group in each terminal unit and a silanol content of preferably greater than about 1000, in two separate stages, one using a fixed bed of a solid form of a conventional equilibration catalyst, and the other using a condensation/disproportionation catalyst, e.g., a phosphonitrilic halide or an oligomer thereof or a reaction product thereof with water, an alcohol, an acid, or a siloxane or silane, until the polydiorganosiloxane has reached the desired low content of silanol groups, e.g., below 200 ppm, by weight. The two stages can be carried out in either order, and a conventional monofunctional chain terminating agent can be present in either or both stages. The process preferably does not increase the cyclic byproduct content.
    Type: Grant
    Filed: July 15, 1993
    Date of Patent: April 18, 1995
    Assignee: General Electric Company
    Inventors: Dennis P. Thompson, Patricia P. Anderson, Donald Slick
  • Patent number: 5401822
    Abstract: The present invention is stereoregular poly{methyl(3,3,3-trifluoropropyl)siloxane} polymers and copolymers and methods for their making. The process involves reacting isomers of 1,3,5-trimethyl-1,3,5-tris(3',3',3'-trifluoropropyl)cyclotrisiloxane in the presence of an aprotic polar promoter and a lithium compound. The lithium compound initiates ring opening and polymerization of the isomers without effecting the steric arrangement of the isomers. Elastomers prepared by cross-linking polymers of the present invention can have sufficient cis 3,3,3-trifluoropropyl substitution to allow the elastomers to strain crystallize and provide reinforcement to the elastomers at typical use temperatures.
    Type: Grant
    Filed: February 3, 1994
    Date of Patent: March 28, 1995
    Assignee: Dow Corning Corporation
    Inventors: Warde T. Collins, Chung M. Kuo, John C. Saam
  • Patent number: 5399649
    Abstract: A method for the high-purity synthesis of a diorganopolysiloxane having a functional group at only one molecular chain terminal, that is characterized by the preliminary silylation with a silylating agent of the silanol group-containing impurity present in the cyclic trisiloxane, and that is characterized by preliminarily converting the silanol group-containing impurity in the cyclic trisiloxane into a lithiated material by lithiation with an organolithium compound and then silylating this lithiated material using a silylating agent that contains silicon-bonded halogen.
    Type: Grant
    Filed: April 25, 1994
    Date of Patent: March 21, 1995
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventor: Tadashi Okawa
  • Patent number: 5399648
    Abstract: High-purity silicone ladder polymer a weight average molecular weight of 600-1,000,000 and a molecular weight distribution of no more than 10 and it contains no more than 1 ppm each of sodium, potassium, iron, copper, lead and chlorine and no more than 1 ppb each of uranium and thorium. This silicone ladder polymer is very pure, has high molecular weight and yet can be produced easily. Hence, it can advantageously be used as a material for making surface protective or inter-level insulation films in semiconductor devices.
    Type: Grant
    Filed: August 23, 1993
    Date of Patent: March 21, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shigeyuki Yamamoto, Hiroshi Adachi
  • Patent number: 5391675
    Abstract: A process for the preparation of amino-substituted organopolysiloxanes which comprises the steps of mixing a catalyst comprising both (i) at least one compound selected from barium hydroxide and strontium hydroxide and (ii) at least one compound selected from borates and phosphates of sodium with (A) a silanol terminated organopolysiloxane compound and (B) an organosilicon compound having at least one silicon-bonded alkoxy or alkoxyalkoxy group and a monovalent substituent composed of carbon, nitrogen and hydrogen and having at least one --NH.sub.2 therein attached to silicon by way of a silicon to carbon linkage and thereafter allowing (A) and (B) to react at a temperature of at least 50.degree. C.
    Type: Grant
    Filed: May 31, 1994
    Date of Patent: February 21, 1995
    Assignee: Dow Corning Limited
    Inventors: Steven E. Cray, Mubarik M. Chowdhry
  • Patent number: 5391674
    Abstract: A process for producing a branched organopolysiloxane, comprising the steps of subjecting mixture of (A) a trialkoxysilane having the general formula (1):R.sup.1 Si(OR.sup.2).sub.3 (1)wherein R.sup.1 is a hydrocarbon group, and R.sup.2 are each a hydrocarbon group, and (B) an organosiloxane oligomer obtained by hydrolysis-condensation of a silane compound having the general formula (2):R.sup.3.sub.a SiCl.sub.4-a (2)wherein R.sup.3 are each a hydrocarbon group and a is 2 or 3, to equilibration reaction in the presence of an alkali catalyst, and adding water, subsequently to or concurrently with the equilibration reaction, to the reaction mixture, thereby hydrolyzing the Si--OR.sup.2 groups contained in the organopolysiloxane resulting from the hydrolysis-condensation. A branched organopolysiloxane stable in molecular composition and properties such as viscosity, can be produced.
    Type: Grant
    Filed: February 17, 1994
    Date of Patent: February 21, 1995
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Hiroyasu Hara, Masayuki Ikeno, Akihito Tsukuno
  • Patent number: 5391679
    Abstract: Polyether siloxanes, which are linked to the polysiloxane backbone through Si--C bonds, are synthesized by reacting given polysiloxanes with a compound having at least one epoxide group in such amounts, that there are at least two epoxide groups per OH group, in the presence of Lewis acids at temperatures not exceeding 60.degree. C. or in the presence of complex catalysts, which accelerate the addition between epoxide groups and hydroxyl groups, at temperatures up to 140.degree. C., the reaction optionally being carried out in the presence of an inert solvent. The polyether siloxanes obtained have a defined functionality and are free of excess, unreacted polyol components.
    Type: Grant
    Filed: May 17, 1993
    Date of Patent: February 21, 1995
    Assignee: Th. Goldschmidt AG
    Inventors: Georg Burkhart, Dietmar Schaefer, Andreas Weier, Dietmar Wewers
  • Patent number: 5386007
    Abstract: The present invention relates to siloxane copolymers containing alkenyl groups and a process for their preparation. The siloxane copolymers of the present invention can be used in cross-linkable compositions for the production of coatings which repel tacky substances, an example of which would include coatings for release papers or films.
    Type: Grant
    Filed: January 10, 1994
    Date of Patent: January 31, 1995
    Assignee: Wacker-Chemie GmbH
    Inventors: Christian Herzig, Michael Geck, Alfred Rengstl, Friedrich Hockemeyer, Helmut Oswaldbauer
  • Patent number: 5378787
    Abstract: The invention relates to a series of novel silicone reactive amino containing dimethicone copolyols. This class of compounds provides unique softening, durability and solubility properties when applied to fibers including textile fibers and hair and skin. The compounds of the present invention contain (a) an amino group, (b) an alkylene oxide containing portion, (c) a reactive group selected from the group consisting of silanol hydroxyl and optionally a alkoxy group. The compounds of the invention are self dispersing in water, by virtue of the alkylene oxide, softening to fiber, by virtue of the amino group and durable by virtue of the silanol and/or hydroxyl group. An additional critically important aspect of the molecule is the fact that it is water soluble or dispersible resulting in stable aqueous systems for delivery to the fiber.
    Type: Grant
    Filed: March 21, 1994
    Date of Patent: January 3, 1995
    Assignee: Siltech Corporation
    Inventors: Rick Vrckovnik, Anthony J. O'Lenick, Jr.
  • Patent number: 5374702
    Abstract: A chain organopolysiloxane is obtained by polymerizing a fluorine-containing cyclotrisiloxane of the general formula: ##STR1## (wherein R.sup.1 is a monovalent hydrocarbon group, and Rf is a perfluoroalkyl group or perfluoroalkyl ether group)in the presence of a lithium silanolate catalyst, silylating the resulting polymerization product, and treating the silylated product at a temperature of not lower than 100.degree. C. under a reduced pressure of not higher than 10.sup.-1 mmHg to remove volatile components therefrom. The organopolysiloxane is essentially free of volatile low-molecular siloxanes. Therefore, the chain organopolysiloxane can be used without the problems which might arise from the volatile low-molecular siloxanes, such as evaporation of low-molecular siloxanes from a cured rubber product with the result of electrical-contact troubles.
    Type: Grant
    Filed: February 15, 1994
    Date of Patent: December 20, 1994
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Hiroshi Inomata, Hirofumi Kishita, Kouichi Yamaguchi, Kenichi Fukuda, Yoshikazu Saito, Nobuyuki Kobayashi
  • Patent number: 5373073
    Abstract: A process for the preparation of 1-monoalkyl(C.sub.1 -C.sub.4) dimethylsilyl-1-propyne polymers which comprises polymerizing a 1-monoalkyl (C.sub.1 -C.sub.4)dimethylsilyl-1-propyne monomer in the presence of a compound of a transition metal and a member selected from .alpha.,.omega.-dihydropolydialkylsiloxanes and polyalkylhydrosiloxanes in a solvent inert to the polymerization. The polymerization reaction proceeds at low temperatures in an efficient manner. Membranes of the resultant polymer have a high gas transmission and suffer but little degradation when placed under severe temperature conditions.
    Type: Grant
    Filed: September 8, 1992
    Date of Patent: December 13, 1994
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yukihiro Saito, Katsunori Waragai, Shiro Asakawa
  • Patent number: 5364888
    Abstract: A UV light-curable organopolysiloxane composition which comprises (A) 100 parts by weight of an organopolysiloxane having at least one functional epoxy group in one molecule, (B) from 1 to 100 parts by weight of a polyether compound of the formula, R.sup.1 --(OR.sup.2).sub.n --OR.sup.3, wherein R.sup.1 represents an alkyl or alkenyl group having from 1 to 8 carbon atoms, R.sup.2 represents an alkylene group having from 2 to 4 carbon atoms, R.sup.3 represents a hydrogen atom or an alkyl or alkenyl group having from 1 to 8 carbon atoms, and n is an integer of from 1 to 50, and (C) from 0.01 to 40 parts by weight of all onium salt photoinitiator.
    Type: Grant
    Filed: September 6, 1991
    Date of Patent: November 15, 1994
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Shunji Aoki, Yasuaki Hara
  • Patent number: 5360878
    Abstract: A new highly crosslinked silicone polymer particle for gas chromatography application and a process for synthesizing such copolymer. The new copolymer comprises vinyltriethoxysilane and octadecyltrichlorosilane. The copolymer has a high degree of crosslinking and a cool balance of polar to nonpolar sites in the porous silicon polymer assuring fast separation of compounds of variable polarity.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: November 1, 1994
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Thomas C. Shen
  • Patent number: 5360833
    Abstract: A UV curable epoxysilicone blend of an epoxy functional silicone resin containing Q groups, epoxy functional M groups, and at least one member selected from D groups and T groups, at least 5 parts of the sum of M groups and epoxy functional M groups per 10 parts of the sum of Q groups, D groups and T groups; and an epoxy-stopped silicone fluid containing epoxy functional M groups.
    Type: Grant
    Filed: November 25, 1992
    Date of Patent: November 1, 1994
    Assignee: General Electric Company
    Inventors: Richard P. Eckberg, Robert F. Agars
  • Patent number: 5357016
    Abstract: The instant invention pertains to a method for producing polydiorganosiloxanes wherein the method comprises contacting (A) at least one organosilicon compound having in the molecule at least one silanol group and/or (C) triorganosilyl endblocker and (D) a diorganocyclicsiloxane with (B) a cation exchanged acid treated montmorillonite clay. The polydiorganosiloxanes produced by the method of this invention have less branching along the siloxane chain than those polydiorganosiloxanes produced by other methods.
    Type: Grant
    Filed: September 20, 1993
    Date of Patent: October 18, 1994
    Assignee: Dow Corning Corporation
    Inventor: Donald K. Takehara
  • Patent number: 5357019
    Abstract: Polycarbosilane polymers are prepared from 1,3-butadiene or substituted 1,3-butadiene by reacting the butadiene with a dichlorosilane in the presence of a reducing metal. The polymers contain silicon hydride or other crosslinkable groups in the polymer chain.
    Type: Grant
    Filed: January 31, 1994
    Date of Patent: October 18, 1994
    Inventors: William P. Weber, Guo-Hong Wang
  • Patent number: 5352751
    Abstract: Straight-chain diorganopolysiloxanes having alkoxy endgroups, well adapted for formulation into single-component polysiloxane compositions which are stable on storage in the absence of moisture, but which crosslink into elastomeric state in the presence of moisture, are prepared by reacting a dihydroxydiorganopolysiloxane with a polyalkoxysilane, and advantageously also with an alkanol, in the presence of a catalytically effective amount of sodium hydroxide or potassium hydroxide.
    Type: Grant
    Filed: May 2, 1991
    Date of Patent: October 4, 1994
    Assignee: Rhone-Poulenc Chimie
    Inventor: Roger Cocco
  • Patent number: 5346968
    Abstract: Oligosiloxanes of the formula I ##STR1## where R.sup.1 is a C.sub.1 -C.sub.4 -alkyl andn is from 2 to 50,are chiefly used for fabricating fiber-reinforced composite and ceramic materials.
    Type: Grant
    Filed: December 1, 1993
    Date of Patent: September 13, 1994
    Assignee: BASF Aktiengesellschaft
    Inventor: Karl-Heinz Haas
  • Patent number: 5331074
    Abstract: Silicone rubber coatings resistant to fouling by aquatic organisms are based on a hydroxy-functional polydiorganosiloxane and a crosslinking agent therefor. The hydroxy-functional polydiorganosiloxane may be packaged separately from the crosslinking agent, or a stable package comprising a hydroxy-functional polydiorganosiloxane terminated by excess crosslinking agent may be packaged separately from further hydroxy-functional polydiorganosiloxane. In either case the two packages can be combined to give the optimum ratio of crosslinking agent to silicon-bonded hydroxyl groups to ensure cure and give optimum resistance to fouling, whilst overcoming the problem of premature gelation during storage.
    Type: Grant
    Filed: December 17, 1992
    Date of Patent: July 19, 1994
    Assignee: Courtaulds Coatings (Holdings) Limited
    Inventors: William W. Slater, deceased, Margaret Slater, executrix, Rodney R. Brooks, Michael J. Winter