Patents Represented by Attorney Sharon K. Severance
  • Patent number: 5905108
    Abstract: An optical silica-containing polysiloxane resin comprises colloidal silica and a polysiloxane resin. The polysiloxane resin has the formula RSiO.sub.3/2, where R is selected from the group consisting of hydrocarbon groups of 1 to 4 carbon atoms and fluorohydrocarbon groups of 3 to 10 carbon atoms. The fluorohydrocarbon groups have the general formula C.sub.n F.sub.(2n+1) C.sub.2 H.sub.4 --, where n is an integer of 1 to 8. The optical silica-containing polysiloxane resin has high light transmissivity and high surface hardness, and can be used for optical elements.
    Type: Grant
    Filed: March 18, 1998
    Date of Patent: May 18, 1999
    Assignee: Dow Corning Asia, Ltd.
    Inventors: Nobuo Kushibiki, Kikuko Takeuchi
  • Patent number: 5904791
    Abstract: A method of adhering an electronic component to substrate in which a layer of a preceramic polymer is applied between the electronic component and the substrate to which it is to be adhered followed by heating to convert the preceramic polymer into a ceramic. The method forms a strong bond which is not affected by the environment. The method is valuable for adhering integrated circuit chips to carriers or circuit boards.
    Type: Grant
    Filed: June 2, 1997
    Date of Patent: May 18, 1999
    Assignee: Dow Corning Corporation
    Inventors: Clayton R. Bearinger, Robert Charles Camilletti, Grish Chandra, Theresa Eileen Gentle, Loren Andrew Haluska
  • Patent number: 5905123
    Abstract: A moisture-curable silicone hot melt pressure-sensitive adhesive composition is disclosed, said composition comprising(i) a solid hydroxyl-functional organopolysiloxane resin comprising R.sub.3 SiO.sub.1/2 siloxane units and SiO.sub.4/2 siloxane units in a molar ratio of 0.5/1 to 1.2/1, respectively, wherein R is selected from hydrocarbon and halogenated hydrocarbon radicals and said hydroxyl content is 1.2 to 6 percent by weight;(ii) an alkoxy-functional diorganopolysiloxane polymer having a viscosity at 25.degree. C. of 20 to <100,000 centipoise, the weight ratio of said resin to said polymer being in the range 40:60 to 80:20;(iii) a silane of the formula R'.sub.4-y SiX.sub.
    Type: Grant
    Filed: June 11, 1993
    Date of Patent: May 18, 1999
    Assignee: Dow Corning Corporation
    Inventors: Martin Eric Cifuentes, William Patrick Brady, Randall Gene Schmidt, William Joseph Schoenherr, Michael Raymond Strong, Bernard VanWert, Gary Allen Vincent
  • Patent number: 5905131
    Abstract: Siloxane-based elastomer-forming compositions comprise a first a,w-dihydroxyl polydiorganosiloxane, a second a,w-dihydroxyl polydiorganosiloxane, a third a,w-dihydroxyl polydiorganosiloxane, an organosilicon compound having at least three silicon-bonded substituents selected from the group consisting of hydrogen and alkoxy groups, and a condensation catalyst. The number average molecular weight ratio of the first a,w-dihydroxyl polydiorganosiloxane to the second a,w-dihydroxyl polydiorganosiloxane is in the range of 20 to 80 and the number average molecular weight ratio of second a,w-dihydroxyl polydiorganosiloxane to the third a,w-dihydroxyl polydiorganosiloxane is in the range of 1 to 6. The molar ratio of the first a,w-dihydroxyl polydiorganosiloxane to the second a,w-dihydroxyl polydiorganosiloxane is in the range of 0.01 to 0.15 and the molar ratio of the second a,w-dihydroxyl polydiorganosiloxane to the third a,w-dihydroxyl polydiorganosiloxane is in the range of 0.2 to 2.
    Type: Grant
    Filed: September 27, 1996
    Date of Patent: May 18, 1999
    Assignee: Dow Corning GmbH
    Inventors: Edouard Joseph, Klaus Kunz
  • Patent number: 5891529
    Abstract: Curable compositions comprising a substance that produces a base when exposed to radiation and a polymer molecule that contains silicon-hydrogen bonds which react with hydroxyl groups under the action of the base to form silicon-oxygen bonds (Si--O) and hydrogen molecules. These compositions cure when exposed to radiation. A pattern can be formed by placing a mask between a coating of the composition and the radiation source during this exposure episode and thereafter dissolving the uncured composition. The compositions have little weight loss during their cure, they can be cured by low intensity radiation, and they yield heat-resistant cured products.
    Type: Grant
    Filed: May 18, 1998
    Date of Patent: April 6, 1999
    Assignee: Dow Corning Asia, Ltd.
    Inventors: Brian Robert Harkness, Mamoru Tachikawa
  • Patent number: 5885741
    Abstract: A coating agent for a carrier for electrostatic latent image development comprised of (A) an organopolysiloxane having the formula (R.sub.3 SiO.sub.1/2).sub.a (R.sub.2 SiO.sub.2/2).sub.b (RSiO.sub.3/2).sub.c, wherein R is a monovalent hydrocarbon group or an epoxy-functional monovalent organic group, provided that the content of epoxy-functional monovalent organic groups relative to total R groups is 0.1 to 100 mol %, a is 0 or a positive number, b is a positive number, c is a positive number and a+b+c is 1; and (B) a curing agent.A carrier for electrostatic latent image development comprised of an inorganic powder coated with the coating agent described above.
    Type: Grant
    Filed: October 23, 1997
    Date of Patent: March 23, 1999
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Shoji Akamastu, Takao Amemiya
  • Patent number: 5882467
    Abstract: The combination of reduced flammability and adhesion can be imparted to cured organosiloxane materials when the curable compositions used to prepare these materials contain 1) an adhesion promoting composition comprising up to about 0.1 weight percent, based on the weight of the curable composition, of a chelated organoaluminum compound in combination with an organic epoxide compound and an alkoxysilane or condensation product of the silane, and 2) as a flame-retarding additive, hydrated aluminum oxide and/or magnesium hydroxide, preferably in combination with additional fillers such as quartz.
    Type: Grant
    Filed: October 28, 1997
    Date of Patent: March 16, 1999
    Assignee: Dow Corning Corporation
    Inventors: David Alan Sierawski, Steven West Wilson, Beth Ann Witucki
  • Patent number: 5877256
    Abstract: The instant invention pertains to a liquid silicone rubber coating composition for application to air bags that is comprised of (A) a diorganopolysiloxane having at least 2 alkenyl groups in each molecule, (B) an organopolysiloxane resin, (C) an inorganic filler, (D) an organohydrogenpolysiloxane having at least 2 silicon-bonded hydrogen atoms in each molecule, (E) a platinum group metal catalyst, and (F) an epoxy group-containing organosilicon compound. The liquid silicone rubber coating composition of the instant invention is capable of coating synthetic air bag fabrics without the use of a diluting solvent and at the same time that has an excellent adhesion to and infiltrability into synthetic air bag fabrics.
    Type: Grant
    Filed: January 22, 1993
    Date of Patent: March 2, 1999
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Akito Nakamura, Yuichi Tsuji
  • Patent number: 5877237
    Abstract: The thermosetting silicone composition of the instant invention is comprised of (a) a diorganopolysiloxane containing alkenyl groups, (b) an organohydrogenpolysiloxane, (c) a platinum catalyst-containing silicone resin fine particle catalyst comprised of (i) a thermoplastic silicone resin containing 5 to 90 mole % PhSiO.sub.3/2 siloxane units and 5 to 20 mole % MeViSiO.sub.2/2 siloxane units, wherein Ph denotes phenyl, Me denotes methyl and Vi denotes vinyl; said resin having a glass transition point of 40.degree. to 70.degree. C. and (ii) 0.05 to 2 wt % as platinum atoms of a platinum catalyst; and (d) a hydrosilation reaction inhibiting compound. The thermosetting silicone compositions have excellent storage stability at about room temperature, and cure at a fast rate when heated.
    Type: Grant
    Filed: December 16, 1994
    Date of Patent: March 2, 1999
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Junji Nakanishi, Toshio Saruyama, Atsushi Togashi
  • Patent number: 5877228
    Abstract: Method for curing UV-curable silicone compositions, characterized by the formation of cured silicone, having a low-tack surface that is harder than the interior, by exposing an ultraviolet-curable silicone composition to ultraviolet radiation at a ratio of the exposure dose for wavelengths of 200 to 280 nm (excluding 280 nm) to the exposure dose for wavelengths of 280 to 400 nm of 0.5 to 10.0.
    Type: Grant
    Filed: September 9, 1997
    Date of Patent: March 2, 1999
    Assignee: Dow Corning Toray Silicone Co., LTD.
    Inventors: Katsutoshi Mine, Hiroyoshi Naito, Kimio Yamakawa
  • Patent number: 5866197
    Abstract: This invention pertains to a method for producing crack-free, insoluble, greater than 1.25 .mu.m thick coatings from hydrogen silsesquioxane resin compositions. The method for producing the coating comprises applying a fillerless hydrogen silsesquioxane resin composition onto a substrate and thereafter heating the hydrogen silsesquioxane resin at a temperature of less than 500.degree. C. for a controlled period of time to produce the crack-free coating having a thickness of greater than 1.25 .mu.m. The resins may be cured in an inert or oxygen containing environment.
    Type: Grant
    Filed: June 6, 1997
    Date of Patent: February 2, 1999
    Assignee: Dow Corning Corporation
    Inventors: Jeffrey Nicholas Bremmer, Kyuha Chung, Chandan Kumar Saha, Michael John Spaulding
  • Patent number: 5863848
    Abstract: This invention relates to the preparation of thermally stable, substantially polycrystalline silicon carbide ceramic fibers using borosilazane resins. The method comprises spinning fibers from the resin, infusibilizing the spun fibers and pyrolyzing the spun fibers at a temperature greater than about 1700.degree. C.
    Type: Grant
    Filed: September 27, 1991
    Date of Patent: January 26, 1999
    Assignee: Dow Corning Corporation
    Inventors: Duane Ray Bujalski, Gregg Alan Zank, Thomas Duncan Barnard
  • Patent number: 5863595
    Abstract: This invention pertains to a method of forming a coating on an electronic substrate and to the electronic substrates coated thereby. The method comprises applying on the electronic substrate a coating composition comprising an aqueous alkanol dispersion of colloidal silica and partial condensate of RSi(OH).sub.3 where R is selected from the group consisting of an alkyl radical having from 1 to 3 carbon atoms, the vinyl radical, the 3,3,3-trifluoropropyl radical, the gamma-glycidoxypropyl radical and the gamma-methacryloxypropyl radical with the provision that at least 70% of the R radicals are methyl, and thereafter ceramifying the coating by heating at a temperature of about 200.degree. C. to 1000.degree. C. The use of the coating composition comprising an aqueous alkanol dispersion of colloidal silica and partial condensate of RSi(OH).sub.3 allows for the formation of thick planarizing coatings on the electronic substrate.
    Type: Grant
    Filed: January 10, 1997
    Date of Patent: January 26, 1999
    Assignee: Dow Corning Corporation
    Inventors: Robert Charles Camilletti, Diana Kay Deese, Loren Andrew Haluska, Mark Jon Loboda, Keith Winton Michael
  • Patent number: 5861235
    Abstract: This invention pertains to a curable composition comprising a N-substituted 4-(o-nitrophenyl)dihydropyridine (a compound that generates base under the action of ultraviolet radiation) and a silanol-containing polymer that condenses under the action of the base generated to form a siloxane bond. The compositions of the instant invention cure by exposure to ultraviolet radiation. Cured patterns may be formed from the curable composition by interposing a mask between a film of the said composition and the radiation source during UV exposure, then dissolving and removing the uncured composition to form a pattern, and thereafter heating the residual material. The compositions can be cured by low-strength ultraviolet radiation and produce a highly heat-resistant cured product.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: January 19, 1999
    Assignee: Dow Corning Asia, Ltd.
    Inventors: Brian R. Harkness, Mamoru Tachikawa, Kasumi Takei
  • Patent number: 5852110
    Abstract: The instant invention pertains to a method for making amino-functional polysiloxane emulsions wherein said method comprises the emulsion polymerization of a mixture comprising cyclosiloxanes and an aminosilane having an amino-functional group solubility parameter equal to or less than 10.0. Said emulsion polymerization is carried out in the presence of water, at least one cationic surfactant and a basic polymerization catalyst. By using an aminosilane having an amino-functional group solubility parameter of equal to or less than 10.0 it is possible to produce emulsions with higher amine concentrations in the resulting polymer.
    Type: Grant
    Filed: June 24, 1996
    Date of Patent: December 22, 1998
    Assignee: Dow Corning Corporation
    Inventor: Ronald Paul Gee
  • Patent number: 5851431
    Abstract: The invention concerns a microemulsion having a mean particle size of 0.15 microns or less comprising:(A) an organopolysiloxane having at least one epoxy containing group per molecule, wherein said epoxy containing group is selected from the group consisting of: ##STR1## where R.sup.1 and R.sup.2 are divalent hydrocarbon groups,and wherein said organopolysiloxane also has carboxyl containing groups present in the amount of 0.5 to 15 moles of caboxyl containing groups per mole of silicon atoms in said organopolysiloxane, wherein said carboxyl containing groups are expressed by the formula:--R.sup.3 --COOR.sup.4whereR.sup.3 is a divalent hydrocarbon group, andR.sup.4 is selected from the group consisting of hydrogen atoms, monovalent hydrocarbon groups and silyl groups expressed by the formula --SiR.sup.5.sub.3, where R.sup.5 indicates the same or different monovalent hydrocarbon groups; (B) a nonionic surfactant; and (C) water.
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: December 22, 1998
    Assignee: Dow Corning Toray Silicone Co., LTD.
    Inventors: Hiroki Ishikawa, Tsutomu Naganawa, Isao Ona
  • Patent number: 5840242
    Abstract: The present invention relates to a method for preparing a ceramic fiber from alkenyl or alkynyl functional resins and to the ceramic fibers produced therefrom. The method comprises (A) forming a fiber from a siloxane resin comprised of R.sup.1.sub.a R.sup.2.sub.b RSiO.sub.(3-a-b)/2 units wherein R is an unsaturated carbon group; each R.sup.1 is selected from the group consisting essentially of an aryl group having from 6 to 10 carbon atoms and functional derivatives thereof; each R.sup.2 is selected from the group consisting essentially of an alkyl group having from 1 to 4 carbon atoms and functional derivatives thereof; a has a value of 0, 1 or 2; b has a value of 0, 1, or 2 with the proviso that a+b <2; (B) curing the fiber by exposing the fiber to high energy radiation to render it non-fusible; and (C) heating the non-fusible fiber in an inert environment to a temperature above about 800.degree. C. to convert it to a ceramic fiber.
    Type: Grant
    Filed: April 22, 1997
    Date of Patent: November 24, 1998
    Assignee: Dow Corning Corporation
    Inventors: William Henry Atwell, Duane Ray Bujalski, Jonathan Lipowitz, Kai Su, Gregg Alan Zank
  • Patent number: 5840220
    Abstract: Organosiloxane compositions exhibiting excellent vibration damping properties comprise(A) from 70 to 99.9 weight percent of a liquid polyorganosiloxane,(B) from 0.1 to 10 weight percent of hollow particles of a thermoplastic organic resin, and(C) from 0 to 20 weight percent of a thickener.
    Type: Grant
    Filed: April 21, 1997
    Date of Patent: November 24, 1998
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Shoji Akamatsu, Yasue Kanzaki
  • Patent number: 5837364
    Abstract: Disclosed are novel ceramic matrix composites in which coated refractory fibers are imbedded in a ceramic matrix derived from a modified hydrogen silsesquioxane resin.
    Type: Grant
    Filed: October 21, 1996
    Date of Patent: November 17, 1998
    Assignee: Dow Corning Corporation
    Inventor: Gregg Alan Zank
  • Patent number: 5825078
    Abstract: This invention relates to integrated circuits which are protected from the environment. Such circuits are hermetically sealed by applying additional ceramic layers to the primary passivation.
    Type: Grant
    Filed: September 23, 1992
    Date of Patent: October 20, 1998
    Assignee: Dow Corning Corporation
    Inventor: Keith Winton Michael