Patents Examined by Karen A. Dean
  • Silicone binder material and products formed therefrom
    Patent number: 5512615
    Abstract: A silicone rubber binder composition is provided which includes silicone rubber, silicon dioxide and an aggregate such as sand, gravel, cinders and the like. The silicone rubber is preferably an RTV silicone rubber which is solubilized using a solvent and mixed with the silicon dioxide and aggregate. The mixture may be spray applied to form a roofing coating or may be molded to form another building element such as a beam, post, block, shingle, wallboard or the like.
    Type: Grant
    Filed: August 12, 1994
    Date of Patent: April 30, 1996
    Assignee: Tamko Roofing Products, Inc.
    Inventor: Thomas O. Olsen
  • Process for preparing a liquid silicone rubber base composition
    Patent number: 5506303
    Abstract: A process for preparing a liquid silicone rubber base composition of the type which comprises (A) an organopolysiloxane of the following average compositional formula (1)R.sub.a SiO.sub.(4-a)/2 (1)wherein each R independently represents an unsubstituted or substituted monovalent hydrocarbon group and a is a value of from 1.95 to 2.05, and (B) a finely divided silica filler is described. The process comprises the steps of mixing a first portion of the ingredient (A) and the ingredient (B) at a temperature not higher than 80.degree. C., further mixing a second portion of the ingredient (A) with the mixture obtained in the first step at a temperature not higher than 80.degree. C. and subjecting the resultant mixture to thermal treatment at a temperature of 130.degree. to 200.degree. C. By this, the base composition has good fluidity and is able to yield a cured product having good tear strength under stress.
    Type: Grant
    Filed: June 6, 1994
    Date of Patent: April 9, 1996
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Takeo Yoshida, Masanobu Miyakoshi, Hironao Fujiki, Shiniti Ide
  • High temperature pressure sensitive adhesives
    Patent number: 5506288
    Abstract: Novel silicone pressure sensitive adhesives containing relatively minor amounts of oil- or organic-metal salts are disclosed which exhibit improved high temperature stability properties.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: April 9, 1996
    Assignee: General Electric Company
    Inventors: Shaow B. Lin, William E. Cooper
  • Method of emulsion polymerization
    Patent number: 5504149
    Abstract: A method is described for making a silicone emulsion. According to the method, there is formed a mixture of water, a cyclic siloxane, optionally a nonionic surfactant, and a cationic surfactant. There is then added to the mixture a polymerization initiator which can be a silanolate or an organosilanolate. The mixture is heated and agitated, and the cyclic siloxane is allowed to polymerize until an emulsion is formed. The benefit of this emulsion polymerization method is that the rate of emulsion polymer formation is enhanced. Thus, the method provides for the production of emulsions in a new and more efficient manner. The silicone emulsion will produce an elastomeric product when water is removed under ambient conditions.
    Type: Grant
    Filed: August 25, 1994
    Date of Patent: April 2, 1996
    Assignee: Dow Corning Corporation
    Inventor: Jeffrey A. Kosal
  • Composition of matter for raised characters and method for manufacturing raised characters for use in signs
    Patent number: 5504144
    Abstract: The invention is a composition of matter used in the making of raised characters for use in signs, and a method of manufacturing raised characters made from the composition. The matter is a polymerizable composition comprising a silicone rubber compound, and about 10 to about 50 weight percent of a silica filler based on the weight of the polymerizable composition. Moreover, the composition of matter is a curable composition comprising a vinyl resin selected from a vinyl plastisol or vinyl organosol, and about 10 to about 50 weight percent of a silica filler based on the weight of curable composition. The composition of matter may be a silicone rubber compound. The invention also includes a method of manufacturing raised characters for use in signs comprising machining the characters from a partially cured polymerizable material.
    Type: Grant
    Filed: December 23, 1992
    Date of Patent: April 2, 1996
    Assignee: American Tactile Corporation
    Inventors: Wayne L. Dorpfeld, Robert W. Williams, Arnold R. Wolfe
  • Method of emulsion polymerization
    Patent number: 5502105
    Abstract: An emulsion is made by dispersing a siloxane in water by forming a mixture of water, a cyclic siloxane, and an ethoxylated alcohol nonionic surfactant. An organosilanolate initiator is used, and the mixture is free of other surfactants which bear a charge. The cyclic siloxane is polymerized until an emulsion is formed, and the emulsion is free of electrical charge. The emulsion is more compatible in the personal care arena.
    Type: Grant
    Filed: August 25, 1994
    Date of Patent: March 26, 1996
    Assignee: Dow Corning Corporation
    Inventor: Anthony Revis
  • Isocyanate reactive blends and internal mould release composites
    Patent number: 5500466
    Abstract: Internal mould release compositions suitable for use in the production of moulded articles by the RIM process, comprises a blend of a metal salt of an organic acid and a polysiloxane polymer having isocyanate reactive organic groups and optionally a compatibilizing amount of an amidine or imidate compound.
    Type: Grant
    Filed: May 17, 1995
    Date of Patent: March 19, 1996
    Assignee: Imperial Chemical Industries PLC
    Inventor: Herbert R. Gillis
  • Silcone elastomer incorporating electrically conductive microballoons and method for producing same
    Patent number: 5498644
    Abstract: An electromagnetic interference shielding composition comprising a silicone elastomer having electrically conductive, magnetic, silver coated ceramic microballoons incorporated therein. The silicone elastomer is formed by combining a room temperature vulcanizing silicone rubber, a quantity of electrically conductive microballoons, and a heat cured silicone rubber.
    Type: Grant
    Filed: September 10, 1993
    Date of Patent: March 12, 1996
    Assignee: Specialty Silicone Products, Inc.
    Inventor: Ned J. Reo
  • Process for preparing uniformly sized, fine particles of polymer
    Patent number: 5496897
    Abstract: Uniformly sized, fine particles of a polymer are produced by:(1) mixing (B) a nonionic-organic compound being liquid at room temperature, having a solubility in water at 25.degree. C. of 0.01 wt. % or larger and being compatible with (A) an oil-soluble, ethylenically unsaturated monomer, with the monomer (A) in an amount of 0.5 to 300 wt. % based on the monomer (A),(2) then adding the mixture of (A) and (B) to an aqueous dispersion of (C) particles of a seed polymer so as to make the mixture of (A) and (B) absorb onto the paricles (C) and(3) polymerizing the mixture of (A), (B) and (C) in the presence of an oil-soluble initiator for the polymerization to obtain said uniformly sized, fine particles.
    Type: Grant
    Filed: August 10, 1992
    Date of Patent: March 5, 1996
    Assignee: Kao Corporation
    Inventors: Akira Yoshimatsu, Akihiro Kondo, Rikio Tsushima
  • Heat-curable silicone elastomer composition
    Patent number: 5494750
    Abstract: A heat-curable silicone elastomer composition comprising (A) a thermoplastic resin containing a platinum catalyst and a hydrosilylation reaction retarding agent, (B) an organopolysiloxane having at least two unsaturated aliphatic hydrocarbon groups bonded to silicon atoms in its molecule, and (C) an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in its molecule. The composition is excellent in storage stability. That is, even when stored for a long time, the composition has good stability at room temperature and retains curability at high temperatures.
    Type: Grant
    Filed: May 10, 1994
    Date of Patent: February 27, 1996
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Kazutoshi Fujioka, Takashi Kondou, Takeo Yoshida
  • Isocyanate reactive blends and internal mould release compositions
    Patent number: 5484829
    Abstract: Internal mould release compositions suitable for use in the production of moulded articles by the RIM process, comprises a blend of a metal salt of an organic acid and a polysiloxane polymer having isocyanate reactive organic groups and optionally a compatibilizing amount of an amidine or imidate compound.
    Type: Grant
    Filed: October 11, 1994
    Date of Patent: January 16, 1996
    Assignee: Imperial Chemical Industries, PLC
    Inventor: Herbert R. Gillis
  • Hot-melt silicone pressure sensitive adhesive with siloxylated polyether waxes as additives
    Patent number: 5482988
    Abstract: The instant invention pertains to a hot-melt pressure sensitive adhesive composition wherein the composition is comprised of a silicone pressure sensitive adhesive selected from the group consisting of a mixture of (i) a silicone resin and (ii) a silicone fluid and a condensed product of (i) and (ii); the silicone pressure sensitive adhesive exhibiting tackiness and adhesiveness; the silicone pressure sensitive adhesive being blended with (iii) from about 1 to 20 weight percent, based on the total weight of (i) and (ii), of a siloxylated polyether wax. The instant invention also encompasses method of using the composition, methods of making hot-melt silicone pressure sensitive adhesive-coated substrates, and devices made using the composition.
    Type: Grant
    Filed: January 14, 1994
    Date of Patent: January 9, 1996
    Assignee: Dow Corning Corporation
    Inventors: Katherine L. Ulman, Randall P. Sweet, Loren D. Durfee
  • Electronic device sealing resin compositions and sealed electronic devices
    Patent number: 5474828
    Abstract: Disclosed herein are electronic device sealing resin compositions containing (A) 40-25 parts by weight of a thermoplastic resin composed of 100-10 wt. % of a poly(arylene thioether-ketone) and 0-90 wt. % of a poly(arylene sulfide), (B) 60-75 parts by weight of an inorganic filler, and per 100 parts by weight of the sum of the thermoplastic resin (A) and inorganic filler (B), (C) 1.5-5 parts by weight of a silicone oil, (D) 10-15 parts by weight of a silicone rubber or (C) 0.5-3 parts by weight of a silicone oil and (D) 5-13 parts by weight of a silicone rubber. Electronic devices sealed using such resin compositions are also disclosed.
    Type: Grant
    Filed: June 30, 1994
    Date of Patent: December 12, 1995
    Assignee: Kureha Kagaku Kogyo K.K.
    Inventors: Toshitaka Kouyama, Keiichiro Suzuki, Toshio Enoki, Yasuo Sakaguchi
  • Method for the preparation of diorganopolysiloxane end-blocked with silanolic hydroxy groups
    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
  • Microwave-heatable exercise putty
    Patent number: 5472994
    Abstract: A microwaveable exercise putty includes a borosiloxane or stannosiloxane reaction product. The resulting reaction product is mixed with a second polysiloxane, an internal lubricant such a monounsaturated fatty acid, and a particulate material which creates heating upon subjection to microwave energy. Precipitated silica is a particularly preferred particulate material. The exercise putty may be manipulated by patients, and at the same time is capable of delivering heat to the body part undergoing the manipulation.
    Type: Grant
    Filed: January 23, 1995
    Date of Patent: December 5, 1995
    Assignee: JMK International, Inc.
    Inventors: A. M. Micallef, Robert M. Gibbon
  • Process for preparing organopolysiloxane gum
    Patent number: 5468830
    Abstract: A siloxane gum is prepared by adding a silane or siloxane having two hydrolyzable groups in a molecule to a silanol-terminated organopolysiloxane in such an amount to give a molar ratio of silanol group/hydrolyzable group of from 0.5 to 3 and effecting condensation polymerization. The resulting organopoly-siloxane has a degree of polymerization of higher than 1,000 and a minimized content of low-molecular weight cyclic siloxanes of less than 5,000 ppm.
    Type: Grant
    Filed: January 31, 1994
    Date of Patent: November 21, 1995
    Assignee: Shin-Etsu Chemical Co. Ltd.
    Inventors: Yoshio Inoue, Susumu Sekiguchi, Minoru Igarashi
  • Flame retardant organosilicon polymer composition, process for making same, and article produced therefrom
    Patent number: 5466728
    Abstract: Disclosed are flame retardant organosilicon compositions, wherein the organosilicon compositions comprise residues derived from (a) polycyclic polyene compounds and (b) residues derived from cyclic polysiloxanes, tetrahedral siloxysilanes and linear poly(organohydrosiloxane)s. Preferably the compositions contain flame retardants, such as a phosphorus containing or halogen containing flame retardant, which may be microencapsulated. Also disclosed are processes for making such compositions and articles made from such compositions.
    Type: Grant
    Filed: September 24, 1993
    Date of Patent: November 14, 1995
    Assignee: Hercules Incorporated
    Inventors: Laura M. Babcock, John K. Bard, Raymond T. Leibfried, Sr.
  • Flame retardant organosilicon polymer composition, process for making same, and article produced therefrom
    Patent number: 5466512
    Abstract: Disclosed are flame retardant organosilicon compositions, wherein the organosilicon compositions comprise residues derived from (a) polycyclic polyene compounds and (b) residues derived from cyclic polysiloxanes, tetrahedral siloxysilanes and linear poly(organohydrosilioxane)s. Preferably the compositions contain flame retardants, such as a phosphorus containing or halogen containing flame retardant, which may be microencapsulated. Also disclosed are processes for making such compositions and articles made from such compositions.
    Type: Grant
    Filed: September 24, 1993
    Date of Patent: November 14, 1995
    Assignee: Hercules Incorporated
    Inventors: Laura M. Babcock, John K. Bard, Raymond T. Leibfried, Sr.
  • Antibacterial, antifungal silicone rubber composition
    Patent number: 5466726
    Abstract: A silicone rubber composition mainly comprising an organopolysiloxane of the average compositional formula: R.sub.n.sup.1 SiO.sub.(4-n)/2 wherein R.sup.1 is a substituted or unsubstituted monovalent hydrocarbon group and n=1.98 to 2.02 can be rendered antibacterial and antifungal by blending a zeolite containing 0.1 to 15% by weight of a silver ion.
    Type: Grant
    Filed: August 26, 1994
    Date of Patent: November 14, 1995
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Yoshio Inoue, Sekiguchi Susumu, Yasuo Kurihara
  • Emulsions of organopolysiloxanes containing polar groups with alkyl polyglycosides as emulsifiers
    Patent number: 5466746
    Abstract: The aqueous emulsions based on(a) 100 parts by weight of organopolysiloxanes which contain polar groups on Si--C-bonded hydrocarbon radicals and(b) not more than 50 parts by weight of alkyl polyglycosides which are stable toward high concentrations of foreign electrolytes.
    Type: Grant
    Filed: March 3, 1994
    Date of Patent: November 14, 1995
    Assignee: Wacker-Chemie GmbH
    Inventors: Michael Geck, Bernward Deubzer, Christine Baumgartner, Hans-Jurgen Lautenschlager, Johann Sejpka