Patents Represented by Attorney, Agent or Law Firm Arne R. Jarnholm
  • Patent number: 6635605
    Abstract: An improved dielectric lubricant is prepared from a (A) a phenyl-methyl siloxane having an average general formula Me3(SiO)—(Me2SiO)x—(MePhSiO)y13 (SiO)Me3 wherein each Me represents a methyl group, each Ph represents a phenyl group, x has a value from zero to about 0.25 and x+y=1; said phenyl-methyl siloxane having a viscosity at 25° C. from about 500 to about 10,000 centipoise in combination with (B) a polytetrafluoroethylene powdered solid. The dielectric lubricant of the invention has particular utility when applied to the interface between a silicone rubber spark plug boot and spark plug.
    Type: Grant
    Filed: June 12, 1998
    Date of Patent: October 21, 2003
    Assignee: Dow Corning Corporation
    Inventors: David Jerome Como, Barry Mark Ketola
  • Patent number: 6037279
    Abstract: A coated textile fabric that has utility for fabricating automobile airbags. A surface of the textile fabric is coated with first and second layers of polyorganosiloxane-based elastomeric material, the first layer being disposed between the textile surface and the second layer. The polyorganosiloxane-based material of the first layer exhibits an elongation-at-break of at least 400%. The polyorganosiloxane-based material of the second layer exhibits a tear-strength of at least 30 kN/m.
    Type: Grant
    Filed: March 11, 1998
    Date of Patent: March 14, 2000
    Assignee: Dow Corning Limited
    Inventors: Lars Brookman, David William Lawson
  • Patent number: 5981670
    Abstract: An alkenyl-functional silylated polymethylsilsesquioxane that contains no more than 0.12 residual silanol per Si atom and is obtained by silylating the silanol in starting polymethylsilsesquioxane. The starting polymethylsilsesquioxane has a predetermined number average molecular weight, Mn, from 380 to 2,000 and is represented by the general formula(CH.sub.3 SiO.sub.3/2).sub.n (CH.sub.3 Si(OH)O.sub.2/2).sub.mwherein m and n are positive numbers that provide the predetermined Mn, with the proviso that the value of m/(m+n) is less than or equal to 0.152/(Mn.times.10.sup.-3)+0.10 and greater than or equal to 0.034/(Mn.times.10.sup.-3). The alkenyl-functional silylated polymethylsilsesquioxane has the formula(CH.sub.3 SiO.sub.3/2).sub.n (CH.sub.3 Si(OH)O.sub.2/2).sub.m-k (CH.sub.3 Si(OSiR.sup.1 R.sup.2 R.sup.3)O.sub.2/2).sub.kwherein k is a positive number smaller than A, (m-k/(m+n) is less than or equal to 0.12, and R.sup.1, R.sup.2 and R.sup.
    Type: Grant
    Filed: February 23, 1998
    Date of Patent: November 9, 1999
    Assignee: Dow Corning Asia, Ltd.
    Inventors: Maki Itoh, Akihito Sakakibara-Saitoh, Michitaka Suto
  • Patent number: 5973067
    Abstract: A novel primer composition, which is especially adapted for promoting the adhesion of thermosetting rubbers to substrates having exceptionally inert surfaces, such a nickel, stainless steel and organic resins is disclosed. The composition comprises: (A) 100 parts, by weight, of an organosilicon compound selected from the group consisting of (1) alkenyltrialkoxysilane and (2) mild hydrolyzates of (1); (B) 0.01-200 parts, by weight, of a platinum compound; (C) 0.1-100 parts by weight of an organic titanic acid ester; and optionally (D) a solvent.
    Type: Grant
    Filed: June 3, 1997
    Date of Patent: October 26, 1999
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Akito Nakamura, Katsuyoshi Nakasuji, Yoshito Ushio
  • Patent number: 5948469
    Abstract: A novel method for preparing silicone rubber particulates coated with metal oxide microparticles, wherein the metal oxide microparticles are derived from a sol, is disclosed. The silicone rubber particulate so prepared has the advantage of reducing aggregation of the particulate mass. The silicone rubber particulate has particular utility as an additive to organic resins for modifying the properties thereof.
    Type: Grant
    Filed: May 19, 1992
    Date of Patent: September 7, 1999
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Yoshitsugu Morita, Atsushi Sakuma
  • Patent number: 5945043
    Abstract: Novel hollow silicone resin particles, having an average particle size of 0.1 to 100 .mu.m are disclosed. The silicone resin particles comprise a skin formed from thermoplastic silicone resin configured in the shape of a hollow capsule. The hollow thermoplastic silicone resin particles are prepared by spraying a dispersion of water and thermoplastic silicone resin dissolved in solvent into hot gas. The hot gas evaporates the solvent and water and at the same time causes solidification of the thermoplastic silicone resin while it is in the spray state, so as to form a plurality of hollow particles therefrom.
    Type: Grant
    Filed: July 14, 1997
    Date of Patent: August 31, 1999
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Mitsuo Hamada, Koichi Ozaki, Toyohiko Yamadera
  • Patent number: 5939500
    Abstract: A hydrogen-functional silylated polymethylsilsesquioxane that contains no more than 0.12 residual silanol per Si atom and is obtained by silylating the silanol in starting polymethylsilsesquioxane. The starting polymethylsilsesquioxane has a predetermined number average molecular weight, Mn, from 380 to 2,000 and is represented by the general formula(CH.sub.3 SiO.sub.3/2).sub.n (CH.sub.3 Si(OH)O.sub.2/2).sub.mwherein m and n are positive numbers that provide the predetermined Mn, with the proviso that the value of m/(m+n) is less than or equal to 0.152/(Mn.times.10.sup.-3)+0.10 and greater than or equal to 0.034/(Mn.times.10.sup.-3). The hydrogen-functional silylated polymethylsilsesquioxane has the formula(CH.sub.3 SiO.sub.3/2).sub.n (CH.sub.3 Si(OH)O.sub.2/2).sub.m-k (CH.sub.3 Si(OSiR.sup.1 R.sup.2 R.sup.3)O.sub.2/2).sub.kwherein k is a positive number smaller than m, (m-k/(m+n) is less than or equal to 0.12, and R.sup.1, R.sup.2, and R.sup.
    Type: Grant
    Filed: February 23, 1998
    Date of Patent: August 17, 1999
    Assignee: Dow Corning Asia, Ltd
    Inventors: Maki Itoh, Akihito Sakakibara-Saitoh, Michitaka Suto
  • Patent number: 5919296
    Abstract: A storage-stable composition adapted for imparting water-repellent properties to masonry materials comprises an aqueous emulsion which defines a continuous aqueous phase and a discontinuous organosilicon phase. The emulsion is formulated from components comprising: (A) a water-insoluble alkoxysilane of the average general formula R.sub.n --Si--R'.sub.(4-n) wherein n is a number from 1 to 2, R is a C.sub.5 -C.sub.20 monovalent hydrocarbon radical and R' is a C.sub.1 -C.sub.4 alkoxy group; (B) a hydrogen-functional polysiloxane having at least two silicon-bonded hydrogen atoms per molecule, at least five siloxy units per molecule and a kinematic viscosity between about 0.5.times.10.sup.-6 and 1,000.times.10.sup.-6 m.sup.2 /sec at 25.degree. C.; (C) an emulsifier; and (D) water. The discontinuous organosilicon phase comprises components (A) and (B) and the continuous aqueous phase comprising said water.
    Type: Grant
    Filed: March 30, 1998
    Date of Patent: July 6, 1999
    Assignee: Dow Corning Corporation
    Inventors: Anh Be, Donald Taylor Liles, Francisco Gerardo Palencia Wilhelmi
  • Patent number: 5914362
    Abstract: A silicone-based antifoam composition, in the form of an emulsion, is prepared from the reaction of (A) a primary silicone composition and (B) a polydiorganosiloxane having condensable terminal groups in a nonpolar organic medium selected from the group consisting of polyisobutylene and mineral oil. The reaction of the primary silicone composition (A) and the polydiorganosiloxane (B) produces a secondary silicone composition, which forms the discontinuous phase of the emulsion and the nonpolar organic medium forms the continuous phase of the emulsion. The resulting composition of the invention exhibits antifoam efficacy greater than that of the primary silicone composition.
    Type: Grant
    Filed: October 30, 1997
    Date of Patent: June 22, 1999
    Assignee: Dow Corning Corporation
    Inventors: Doris Jean Brecht, Russell Allen Elms, Kenneth Christopher Fey, Ronald Paul Gee
  • Patent number: 5907019
    Abstract: A silylated polymethylsilsesquioxane, that contains no more than 0.12 residual silanol per Si atom and has a predetermined number average molecular weight from 380 to 2,000 is obtained by silylating the silanol in a starting polymethylsilsesquioxane with the formula(CH.sub.3 SiO.sub.3/2).sub.n (CH.sub.3 Si(OH)O.sub.2/2).sub.mwherein m and n are positive numbers that provide the specified molecular weight and 0.034/(M.times.10.sup.-3).ltoreq.m/(m+n).ltoreq.0.152/(M.times.10.sup.-3)+ 0.10. The silylated polymethylsilsequioxanes of the present invention exhibit compatibility with silicone polymers, e.g., polydimethylsiloxanes. As a consequence, the silylated polymethylsilsesquioxanes of the invention can be used in a wide range of applications as, for example, a reinforcing filler for rubbers.
    Type: Grant
    Filed: November 25, 1997
    Date of Patent: May 25, 1999
    Assignee: Dow Corning Asia, Ltd.
    Inventors: Maki Itoh, Akihito Sakakibara-Saitoh, Michitaka Suto
  • Patent number: 5880227
    Abstract: A moisture-curable silicone composition is prepared from (A) an organopolysiloxane resin having hydrolyzable groups associated therewith, (B) a fluorosilicone resin having residual silanol groups associated therewith, (C) a hydrolyzable organosilane and (D) a cure accelerating catalyst. The cured composition of the invention in prepared by reacting the aforementioned components (A) through (D) in the presence of moisture and results in a material exhibiting superior oil- and water-repellent properties.
    Type: Grant
    Filed: July 25, 1996
    Date of Patent: March 9, 1999
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Hideki Kobayashi, Toru Masatomi
  • Patent number: 5855667
    Abstract: A gypsum mixture is disclosed which has hydrophobic additive substantially uniformly dispersed therein and which comprises gypsum, a first silane of the general formula (RO).sub.3 SiR or of the general formula (RO).sub.2 SiR.sub.2, and a second silane of the general formula (RO).sub.3 SiR' or of the general formula (RO).sub.2 SiRR', wherein each R is the same or different and represents a lower alkyl group, and R' represents a lower alkyl group which is substituted by a substituent selected from an amino, amino-lower alkyl-amino or dialkylenetriamine group. Preferably, the first silane is methyltrimethoxysilane and the second silane is N-(2-aminoethyl)-3-aminopropyltrimethoxysilane. Also disclosed is a method for preparing said gypsum mixture.
    Type: Grant
    Filed: July 16, 1997
    Date of Patent: January 5, 1999
    Assignee: Dow Corning, Ltd.
    Inventor: Bryan Thomas
  • Patent number: 5844031
    Abstract: A method of dispersing silicone compositions in organic thermoplastic materials is disclosed. The novel compositions produced by the method of the invention have a fine and relatively uniform dispersion or organosilicone in an organic thermoplastic. An organosilicone resin (A) and a predominantly linear silicone fluid (B) are first blended to substantial homogeneity to form an organosilicone alloy therefrom. The organosilicone alloy exhibits thermoplastic behavior and has a temperature-dependent complex viscosity .eta.*.sub.Si (T) associated therewith. Likewise the organic thermoplastic materials have a temperature-dependent complex viscosity, .eta.*.sub.OTP (T), associated therewith. The organic thermoplastic and the organosilicone alloy are thereafter mixed at a predetermined mixing temperature, T.sub.m, and a predetermined shear strain rate. The organic thermoplastic material and the organosilicone alloy are both in a flowable state at T.sub.m. The value of T.sub.m is selected to be about .+-.30.degree. C.
    Type: Grant
    Filed: August 28, 1996
    Date of Patent: December 1, 1998
    Assignee: Dow Corning Corporation
    Inventors: Wei Chen, Hongxi Zhang, Kevin Edward Lupton, David Joseph Romenesko, Randall Gene Schmidt
  • Patent number: 5840428
    Abstract: Novel radiation-curable, organically-modified siloxane resin compositions are prepared from (A) at least one multifunctional acrylate and (B) the reaction product formed from (a) an alkoxy-functional organometallic compound, (b) an alkoxy silane and (c) water. The alkoxy silane (b) includes at least one functional group that renders the alkoxy silane copolymerizable with the multifunctional acrylate (A). The alkoxy-functional organometallic compound (a) and the alkoxy silane (b) undergo co-hydrolysis and co-condensation, which is optionally carried out in the presence of a siloxane polymerization catalyst (d).
    Type: Grant
    Filed: August 19, 1996
    Date of Patent: November 24, 1998
    Assignee: Dow Corning Corporation
    Inventors: John Donald Blizzard, James Steven Tonge
  • Patent number: 5837784
    Abstract: Alkoxylated organosilicone resins are made by reacting an MQ resin with alkoxysilanes in the presence of a catalytic amount of a base catalyst. The alkoxy silanes may include numerous organo groups such as alkyl, alkenyl, aryl, arylalkyl, epoxy, ether, alkylamide, alkylamine which are also incorporated into the structure of the alkoxylated organosilicone resin so-made.
    Type: Grant
    Filed: June 12, 1996
    Date of Patent: November 17, 1998
    Assignee: Dow Corning Corporation
    Inventor: Gary Allen Vincent
  • Patent number: 5830950
    Abstract: Novel rubber-modified rigid silicone resins a novel method of making the same are disclosed. The resins are the copolymerized reaction product of (A) an organosilicon composition selected from the group consisting (I) an organosilicone resin, (II) hydrolyzable precursors of (I), and an hydrolyzate of (II) and (B) an silicone rubber. In the method of the invention, the copolymerization step is carried out in an organic solvent, preferably utilizing a relatively weak condensation catalyst. Thereafter, the solution is devolatilized and the composition cured by heating.
    Type: Grant
    Filed: December 31, 1996
    Date of Patent: November 3, 1998
    Assignees: Dow Corning Corporation, Massachusetts Inst. Tech.
    Inventors: Dimitris Elias Katsoulis, John Robert Keryk, Frederick Jerome McGarry, Bizhong Zhu
  • Patent number: 5824421
    Abstract: Condensation-curable coating compositions are prepared from a mixture of and organic resin (A) and a flurosilicone (B). Water or an organic solvent may be used to provide a vehicle for application of the composition. The cured coatings of the invention exhibit superior water and oil repellency.
    Type: Grant
    Filed: October 30, 1996
    Date of Patent: October 20, 1998
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Hideki Kobayashi, Toru Masatomi
  • Patent number: 5824762
    Abstract: A radiation-curable coating composition is formulated from a silicone resin that includes acrylate or methacrylate functional organic groups and phenyl groups.
    Type: Grant
    Filed: December 6, 1996
    Date of Patent: October 20, 1998
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Toshio Saruyama, Makoto Yoshitake
  • Patent number: 5824814
    Abstract: A method for preparing a viscosity stable amido functional polysiloxane having a group .dbd.NCO(CHR).sub.n OH connected with a silicon atom of a siloxane unit of the polysiloxane comprises;i) preparing a viscosity stable intermediate amino functional polysiloxane having one or more siloxane units according to the general formula R.sup.2.sub.q' (HR.sup.4 N R").sub.r' SiO.sub.(4-(q'+r'))/2, any remaining units of the intermediate being of the general formula R.sup.2.sub.q SiO.sub.(4-q)/2, by condensation polymerisation;ii) adding an alcohol or substituted alcohol to the intermediate or to organo-silicon compounds used to produce the intermediate by condensation polymerisation, the alcohol or substituted alcohol being of the general formula R.sup.1 OH, wherein R.sup.1 is a substituted or unsubstituted alkyl group of from 4 to 30 carbon atoms, and;iii) reacting the viscosity stable intermediate polysiloxane resulting from ii) with a lactone of the general formula ##STR1## wherein R and n are as defined above.
    Type: Grant
    Filed: February 3, 1998
    Date of Patent: October 20, 1998
    Assignee: Dow Corning Ltd
    Inventors: Stephen E. Cray, Martin J. Evans
  • Patent number: 5789084
    Abstract: A curable liquid silicone rubber coating composition is disclosed. The curable composition of the invention exhibits excellent infiltrability and can be used to for thin coatings on synthetic fabrics, without using a dilution solvent. The cured composition is tackfree coating film with excellent adherence to synthetic fabrics. The curable composition includes: (A) a diorganopolysiloxane that contains at least 2 alkenyl groups in each molecule; (B) an organopolysiloxane resin; (C) an inorganic filler; (D) an organohydrogenpolysiloxane that contains at least 2 silicon-bonded hydrogen atoms in each molecule; (E) a platinum group catalyst; (F) an epoxy-functional organosilicon compound; and (G) an organotitanium compound.
    Type: Grant
    Filed: September 19, 1996
    Date of Patent: August 4, 1998
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Akito Nakamura, Yuichi Tsuji