Patents Represented by Attorney Roger H. Borrousch

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  • Microwave cured silicone elastomeric foam
    Patent number: 4391765
    Abstract: A simplified method of manufacturing a silicone elastomeric foam comprises mechanically generating a stable froth of an aqueous emulsion, while adding surfactant and thickener, then exposing the stable froth to microwave energy to remove the water. The emulsion consists essentially of anionically stabilized hydroxyl endblocked polydiorganosiloxane, colloidal silica, an organic tin compound, and water, the emulsion having a pH in the range of 9 to 11.5 inclusive. The dried froth is an elastomeric, cellular structure possessing typical silicone elastomer heat stability and long-term aging stability.
    Type: Grant
    Filed: June 25, 1982
    Date of Patent: July 5, 1983
    Assignee: Dow Corning Corporation
    Inventors: Chi-long Lee, Sherwood Spells
  • Color stable chelated titanate compositions
    Patent number: 4391937
    Abstract: A composition containing a chelated titanium compound and an additive selected from the group consisting of (1) esters of thioalkanoic acids, (2) di-tertiary-butyl phenol containing compounds, (3) organic phosphites, and (4) mixtures of (2) and (3), retards the color change of the composition on storage. When this composition is used as the catalyst for one package, room temperature curing silicone elastomeric compositions of the type comprising a hydroxyl endblocked polydiorganosiloxane and a silane having an average of from 2.01 to 4 inclusive alkoxy radicals, the silicone elastomeric composition can be stored without substantial color formation. The improvement in reduced color change is useful in silicone elastomeric compositions which are clear or light colored.
    Type: Grant
    Filed: October 5, 1981
    Date of Patent: July 5, 1983
    Assignee: Dow Corning Corporation
    Inventors: James R. Falender, Angelika H. McHale
  • Room temperature curable organopolysiloxane compositions and methods for their preparation
    Patent number: 4387177
    Abstract: A low modulus silicone rubber which cures at room temperature can be obtained by exposing a composition made from a hydroxyl endblocked polydiorganosiloxane, an aminoxy silicon compound having two aminoxy groups per molecule, such as, methylvinyldi-(N,N-diethylaminoxy)silane, and a hydrolyzable organosilicon compound which has at least three hydrolyzable groups per molecule including oxime, alkoxy, amino, vinyloxy, amide, imide, and lactam such as methyltri(N-methylacetamido)silane or methyltrimethoxysilane. The compositions can be packaged in a single container and, if sealed, remain stable until exposed to moisture. The compositions can be made by a two-step method comprising mixing the aminoxy silicon compound and the hydroxyl endblocked polydiorganosiloxane and thereafter blending in the hydrolyzable organosilicon compound.
    Type: Grant
    Filed: February 2, 1982
    Date of Patent: June 7, 1983
    Assignee: Toray Silicone Company, Ltd.
    Inventors: Katsutoshi Mine, Tadao Tamaki
  • Curable fluorinated silicone elastomer
    Patent number: 4386170
    Abstract: The resistance of a fluorinated silicone elastomer to the effects of exposure to hot fuel, hot oil, and elevated temperature has been improved by the addition of from 0.8 to 5 parts by weight of polytetrafluoroethylene powder to a curable fluorinated silicone elastomeric composition, consisting essentially of a fluorinated polydiorganosiloxane gum having from 45 to 50 percent of the organic radicals being 2-(perfluoroalkyl)ethyl radicals, from 50 to 55 percent of the organic radicals being monovalent hydrocarbon radicals with from 0.1 to 1 percent of the monovalent hydrocarbon radicals being aliphatic unsaturated radicals, and a treated reinforcing silica filler. The resistance is further improved by also including an alkaline earth metal oxide or hydroxide acid acceptor.
    Type: Grant
    Filed: October 31, 1980
    Date of Patent: May 31, 1983
    Assignee: Dow Corning Corporation
    Inventor: Carl M. Monroe
  • Low temperature silicone gel
    Patent number: 4374967
    Abstract: This invention relates to a novel low-temperature dielectric silicone gel which is the reaction product of a polyorganosiloxane consisting essentially of Me.sub.2 SiO, MeSiO.sub.1.5, Me.sub.3 SiO.sub.0.5 and Me.sub.2 ViSiO.sub.0.5 ; an organohydrogensiloxane and a platinum catalyst.
    Type: Grant
    Filed: February 8, 1982
    Date of Patent: February 22, 1983
    Assignee: Dow Corning Corporation
    Inventors: Paul L. Brown, Chi-Long Lee, Myron T. Maxson
  • Flame retardant silicone rubber compositions containing carboxamides
    Patent number: 4366278
    Abstract: A flame retardant silicone rubber with improved flame retardant properties and colorability can be obtained from a polydiorganosiloxane, a silica filler, a carboxamide, a platinum, an organic peroxide, and optionally cerium oxide or cerium hydroxide.
    Type: Grant
    Filed: March 20, 1981
    Date of Patent: December 28, 1982
    Assignee: Toray Silicone Co., Ltd.
    Inventors: Mitsuo Hamada, Sadami Yasuda
  • Flowable, room temperature vulcanizable silicone composition
    Patent number: 4360631
    Abstract: A flowable, room temperature vulcanizable silicone composition is obtained by mixing 100 parts by weight of hydroxyl endblocked polydiorganosiloxane, 0 to 150 parts by weight of a nonacidic, nonreinforcing filler, 2 to 20 parts by weight of methylvinyldi-(epsilon-caprolactamo)silane and 0.25 to 7 parts by weight of an aminoxysilicon compound having 3 to 10 aminoxy groups per molecule. The composition cures on exposure to moisture to a low modulus silicone elastomer which is useful as a sealant for horizontal joints such as in highways or outdoor patios.
    Type: Grant
    Filed: March 6, 1981
    Date of Patent: November 23, 1982
    Assignee: Dow Corning Corporation
    Inventor: James R. Hahn
  • Method of improving silicone rubber composition
    Patent number: 4360610
    Abstract: A new method of producing a silicone rubber composition yields a unique composition. When the composition is further mixed with extending filler and vulcanized, the tensile strength of the vulcanized silicone rubber is improved over that obtained when the composition is not produced following the method of this invention. The method mixes polydiorganosiloxane gum, treated reinforcing silica filler, a portion of hydroxylated organosilicon compound having an average of from 1 to 20 percent by weight hydroxyl radicals and an average of from 1 to 31 percent by weight vinyl radicals; heating the mixture; then cooling and admixing another portion of the hydroxylated organosilicon compound.
    Type: Grant
    Filed: March 23, 1981
    Date of Patent: November 23, 1982
    Assignee: Dow Corning Corporation
    Inventors: Milton C. Murray, Joan M. Donatelli
  • Curable organopolysiloxane composition for heat fixing rolls
    Patent number: 4360566
    Abstract: Heat fixing rolls for electrophotographic dry toner processes are made with a silicone rubber outer layer which contains substantial amounts of siliceous filler, including reinforcing silica filler. The heat fixing rolls produce an increased number of copies before offset occurs.
    Type: Grant
    Filed: February 4, 1982
    Date of Patent: November 23, 1982
    Assignee: Toray Silicone Co., Ltd.
    Inventors: Koji Shimizu, Toshio Watanabe, Mitsuo Hamada
  • Organopolysiloxane elastomer-forming compositions
    Patent number: 4355129
    Abstract: A pigmented composition which is curable to a silicone rubber having improved color retention under conditions involving exposure to a corona discharge. The composition comprises (A) a curable polydiorganosiloxane, (B) a filler, (C) an organic peroxide curing agent and (D) a pigment which is an inorganic calcined complex containing Co and Al.
    Type: Grant
    Filed: April 13, 1981
    Date of Patent: October 19, 1982
    Assignee: Dow Corning Limited
    Inventor: Michael J. Dams
  • Heat cured silicone elastomer
    Patent number: 4347336
    Abstract: A composition comprising a hydroxyl endblocked polydiorganosiloxane, methylvinylsilyl-bis-pyrrolidone, and organic peroxide will simultaneously chain extend and crosslink when heated. The composition can be prepared with a low viscosity polydiorganosiloxane to yield a low viscosity composition useful for coating, impregnating, and forming operations. Because the polymer chain extends as well as crosslinks during cure, the physical properties of the cured elastomer are superior to those of a low viscosity polymer which is merely crosslinked to an elastomer.
    Type: Grant
    Filed: October 13, 1981
    Date of Patent: August 31, 1982
    Assignee: Dow Corning Corporation
    Inventors: Gary R. Homan, Charles A. Romig
  • Rubber compositions containing ethylene-propylene-diene terpolymers or ethylene-propylene copolymers and silicones
    Patent number: 4341675
    Abstract: A rubber made from a blend of EPDM or EPR and a polydiorganosiloxane gum has strength, heat resistance, and adhesiveness to room-temperature, moisture-curable silicone rubber. The rubber is made from a blend of EPDM or EPR, polydiorganosiloxane gum, a polyorganosiloxane containing aliphatic hydrocarbon radicals of 4 to 20 carbon atoms, a polyoxyalkylene-organosiloxane copolymer or a poly(hydroxyalkyl)organosiloxane, and an organic peroxide.
    Type: Grant
    Filed: March 30, 1981
    Date of Patent: July 27, 1982
    Assignee: Toray Silicone Company, Ltd.
    Inventor: Akito Nakamura
  • Silicone compositions for the treatment of glass fibers and methods of treatment
    Patent number: 4340090
    Abstract: A product obtained by mixing a vinyl-containing poly- diorganosiloxane, an organohydrogenpolysiloxane, a silica filler treated with dimethyldichlorosilane, optionally diphenylsilanediol, and a platinum catalyst is useful for treating glass fiber and is an electrical insulating material. The cured product has excellent electrical characteristics, flame retardancy, mechanical strength, and transparency.
    Type: Grant
    Filed: August 21, 1981
    Date of Patent: July 20, 1982
    Assignee: Toray Silicone Company, Ltd.
    Inventors: Takao Matsushita, Kazuo Hirai
  • Method of producing organosilicon composition with in situ produced cure inhibitor
    Patent number: 4336364
    Abstract: A storage stable, one part, heat curable organosilicon composition is prepared by mixing an organosilicon polymer having at least two monovalent hydrocarbon radicals containing aliphatic unsaturation, a platinum catalyst, an acetylenic alcohol, and a siloxane compound having at least three silicon-bonded hydrogen atoms bonded to at least three separate silicon atoms; heating above 100.degree. C.; cooling below 50.degree. C.; removing excess acetylenic alcohol; and adding an organosilicon compound containing silicon-bonded hydrogen atoms to yield the organosilicon composition. The method produces an inhibitor for the curing reaction during the process of manufacture so that the composition is storage stable even though all the ingredients necessary for cure are present in the composition.
    Type: Grant
    Filed: July 20, 1981
    Date of Patent: June 22, 1982
    Assignee: Dow Corning Corporation
    Inventor: Myron T. Maxson
  • Silicone compositions for adhesion and method for adhering silicone rubber to a substrate
    Patent number: 4332844
    Abstract: A silicone composition prepared from an alkoxy-containing silicon compound, an organotitanate, and an organohydrogensilicon compound, optionally an organic solvent is useful for improving the adhesion between silicone rubber and a substrate.
    Type: Grant
    Filed: January 2, 1981
    Date of Patent: June 1, 1982
    Assignee: Toray Silicone Limited
    Inventors: Mitsuo Hamada, Sadami Yasuda, Chiichiro Hasegawa
  • Flame retardant silicone rubber compositions
    Patent number: 4310444
    Abstract: Flame retardant silicone rubber can be prepared from organopolysiloxane, silica filler, platinum, a fatty acid or a metal salt of the fatty acid in which the fatty acid has at least 11 carbon atoms, organic peroxide and optionally a triazole. Such silicone rubber is transparent and flame retardant. Silicone rubber which does not require the transparency can be prepared from such compositions which include titanium dioxide to enhance the flame retardant properties.
    Type: Grant
    Filed: August 25, 1980
    Date of Patent: January 12, 1982
    Assignee: Toray Silicone Company, Ltd.
    Inventors: Mitsuo Hamada, Sadami Yasuda
  • Base member coated with an electrically conductive silicone elastomer
    Patent number: 4303735
    Abstract: It has been discovered that the addition of a small amount (less than 5 percent by weight) of chopped graphite fibers to an electrically conductive silicone elastomeric mixture increases the electrical conductivity to an unexpected degree. The electrically conductive silicone elastomeric mixture can be coated on a base member and cured to yield an electrically conductive device.An application of the technology is the manufacture of conductive core for use in automotive ignition cable. By using this electrically conductive silicone elastomeric mixture it is no longer necessary that the base member itself be conductive.
    Type: Grant
    Filed: September 2, 1980
    Date of Patent: December 1, 1981
    Assignee: Dow Corning Corporation
    Inventors: Gerald P. Kehrer, William G. Smith
  • Curable organopolysiloxane composition containing microcapsules
    Patent number: 4293677
    Abstract: One package compositions of organopolysiloxane containing alkenyl radicals, organohydrogenpolysiloxane and a catalyst for the addition reaction can be prepared by using microcapsules which contain the organohydrogenpolysiloxane. The microcapsules have nonpermeable films which keep the organohydrogenpolysiloxane separated from the other reactive components. When the microcapsules are ruptured, the composition cures. These one-package compositions can be used as coating materials, potting materials for electrical equipment, release coatings and bonding agents.
    Type: Grant
    Filed: June 9, 1980
    Date of Patent: October 6, 1981
    Assignee: Toray Silicone Company, Ltd.
    Inventor: Takeshi Imai
  • Polysiloxane emulsion elastomers reinforced with emulsified organo-silicone copolymers
    Patent number: 4288356
    Abstract: A method of blending an emulsion of an emulsion polymerized copolymer of an organic monomer and an organosilicon monomer and an emulsion of a polydiorganosiloxane to provide a reinforced elastomeric product is disclosed. The physical properties of the cured polydiorganosiloxane elastomeric product are improved by the addition of the copolymer emulsion, as compared to the addition of an organic homopolymer, particularly the tear strength. The blended emulsions and the product obtained by devolatilizing the blended emulsion is also claimed. The cured product is useful as a coating for surfaces, as a textile treatment, and as a paper treatment.
    Type: Grant
    Filed: September 30, 1980
    Date of Patent: September 8, 1981
    Assignee: Dow Corning Corporation
    Inventors: David J. Huebner, Donald R. Weyenberg
  • Compositions including mercaptoorganopolysiloxanes, aliphatically unsaturated polydiorganosiloxanes and carboxylic acid salts of metals
    Patent number: 4284539
    Abstract: Oxygen curable compositions are provided by mixing mercaptoorganopolysiloxane, aliphatically unsaturated polydiorganosiloxane and a metal salt of a carboxylic acid, where the metal is iron, manganese, or nickel.
    Type: Grant
    Filed: December 3, 1979
    Date of Patent: August 18, 1981
    Assignee: Dow Corning Corporation
    Inventors: Gary R. Homan, Chi-Long Lee