Patents Represented by Attorney Roger H. Borrousch

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  • Method of indicating a cure point for ultraviolet radiation curing compositions by color change
    Patent number: 5302627
    Abstract: Adding a dye with a visible color to an ultraviolet radiation curable composition which contains a photoinitiator which generates free radicals upon exposure to ultraviolet radiation produces a composition which changes visible color upon exposure to ultraviolet radiation. This visible color change indicates that the composition has cured. This cure indication is useful for compositions curable by ultraviolet radiation in the electronics and electrical industry.
    Type: Grant
    Filed: March 9, 1992
    Date of Patent: April 12, 1994
    Assignee: Dow Corning Corporation
    Inventors: Arthur J. Field, Michael R. Strong
  • Modulus controllable room-temperature-curable silicone elastomer composition
    Patent number: 5300612
    Abstract: A room-temperature-curable silicone elastomer composition that is highly workable prior to its cure and that cures to give a silicone elastomer having a desirable stiffness is made from a silanol-terminated polydiorganosiloxane, a dialkoxysiloxane of the formula ##STR1## where R.sup.1 represents monovalent hydrocarbon groups and R.sup.2 represents monovalent hydrocarbon groups having 1 to 8 carbon atoms, a tri- or tetra-alkoxysilane, and a curing catalyst.
    Type: Grant
    Filed: June 17, 1993
    Date of Patent: April 5, 1994
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventor: Toshio Saruyama
  • Room temperature-curable organopolysiloxane composition
    Patent number: 5290851
    Abstract: A room temperature-curable organopolysiloxane composition which does not suffer from surface fissuring even when subjected to external stress (e.g., tensile stress, flexural stress) during the course of its cure was prepared and has a composition of a hydroxyl-terminated polydiorganosiloxane, a hydrophobic silica with a silanol titer not exceeding 2.0 mL, a dry-method silica with a silanol titer of at least 5.0 mL, and an oxime group-containing silane or siloxane.
    Type: Grant
    Filed: January 30, 1992
    Date of Patent: March 1, 1994
    Assignee: Dow Corning Toray Silicone, Ltd.
    Inventors: Tadao Ishida, Miyoji Fukayama, Noriyuki Suganuma
  • Two-part, ultra low modulus silicone sealant
    Patent number: 5290826
    Abstract: A two part sealant cures rapidly in deep sections when the two parts are mixed together. A first part consists essentially of a hydroxyl endblocked polydiorganosiloxane, non-reinforcing, non-acidic filler, diacetamidosilane chain extender of the general formula ##STR1## and aminoxysilicone compound having from 1 to 100 silicone atoms per molecule and from 3 to 10 aminoxy groups per molecule. A second part consists essentially of a hydroxyl endblocked polydiorganosiloxane, non-reinforcing, non-acidic filler, and water. When mixed together, the two parts cure rapidly in deep sections.
    Type: Grant
    Filed: May 15, 1990
    Date of Patent: March 1, 1994
    Assignee: Dow Corning Corporation
    Inventor: Richard A. Palmer
  • Epoxy-containing organopolysiloxane and method for the preparation thereof
    Patent number: 5283309
    Abstract: An organopolysiloxane having monofunctional siloxane units (M unit) and tetrafunctional siloxane units (Q unit) and also having in the molecule an epoxy group-containing organic group, a polydiorganosiloxane residue bonded therein across a divalent hydrocarbon group, and optionally alkoxysilylalkyl is useful as an internal stress-relaxing agent, an internal mold-release, and as an adhesion promoter for curable organopolysiloxanes. These organopolysiloxanes are made by an addition reaction.
    Type: Grant
    Filed: November 12, 1992
    Date of Patent: February 1, 1994
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventor: Yoshitsugu Morita
  • Alkoxy endblocked polydiorganosiloxane and room temperature vulcanizable silicone elastomers made therefrom
    Patent number: 5276123
    Abstract: An alkoxy endblocked polydiorgansiloxane of the formulaZ--(SiR.sub.2 O).sub.n SiR.sub.2 --Zwhere Z is ##STR1## where Y isR.sub.a (R'O).sub.(3-a) Si--,X is ##STR2## in which a is 0 or 1, d has a value of 1 to 3 inclusive, v is 0 or 1, n.ltoreq.8, p has a value of 3 to 6 inclusive, q has a value of 2 to 6 inclusive, r has a value of 4 to 6 inclusive, w is 0 or 1, Me is methyl, R.sup.1 is an alkyl radical having from 1 to 6 inclusive carbon atoms, each R is a monovalent radical independently selected from the group consisting of hydrocarbon radicals and halogenated hydrocarbon radicals, R' is an alkyl radical of 1 to 3 inclusive carbon atoms, R" is a divalent hydrocarbon radical selected from the group consisting of --(CH.sub.2).sub.b -- and --CH(Me)(CH.sub.2).sub.
    Type: Grant
    Filed: September 3, 1992
    Date of Patent: January 4, 1994
    Assignee: Dow Corning Corporation
    Inventors: Russell K. King, Chi-long Lee
  • Polydimethylsiloxanes for modulus reduction and method for their preparation
    Patent number: 5264603
    Abstract: A polydimethylsiloxane which has both low reactivity endgroups and high reactivity endgroups. These polydimethylsiloxanes are useful for making sealants with reduced modulus. An example of these polydimethylsiloxanes is one having low reactivity endgroups of the formulaXR.sub.2 SiO--where X is methoxy or methylethylketoximo, and R is methyl or vinyl and high reactivity endgroups having a formulaY.sub.b R.sub.(3-b) SiO--in which b is 2 or 3, R is methyl radical, and each Y is a hydrolyzable group selected from the group consisting of a ketoximo group and methoxy.
    Type: Grant
    Filed: August 25, 1992
    Date of Patent: November 23, 1993
    Assignee: Dow Corning Corporation
    Inventors: Michael G. Altes, Louise C. Bergman, Jerome M. Klosowski, Virginia K. O'Neil
  • Flame-resistant polyorganosiloxane compound containing hollow glass balls and intumescent compound
    Patent number: 5262454
    Abstract: A flame-resistant, hardenable polyorganosiloxane compound is described with a content of 2 to 40 weight % hollow glass balls with an outside diameter of up to 200 .mu.m and 3 to 50 weight % of an inorganic intumescent compound which expands at a temperature from 80.degree. to 250.degree. C. The preferred intumescent compound is expandable graphite. The compound can replace the previous compounds provided with polyhalogenated diphenyl compounds in fireproof windows.
    Type: Grant
    Filed: January 24, 1992
    Date of Patent: November 16, 1993
    Assignees: Down Corning GmbH, Schott Glaswerke
    Inventors: Roland Leroux, Jurgen Thurk, Reinhard Jonas
  • Cluster azasilacycloalkyl functional polysiloxanes
    Patent number: 5254645
    Abstract: Cluster azasilacycloalkyl functional polysiloxanes are prepared by combining vinyl-containing polysiloxane, polyfunctional hydrogen polysiloxane, and a platinum catalyst; reacting the combination to produce .tbd.Si--CH.sub.2 CH.sub.2 --Si.tbd. linkages and substantial amounts of unreacted Si--H groups remain in the reaction product. The Si--H groups in the reaction product are reacted with aliphatically unsaturated azasilacycloalkane forming the cluster compound. These cluster azasilacycloalkyl functional polysiloxanes cure when exposed to moisture to elastomers, sealants, encapsulants, and resins products.
    Type: Grant
    Filed: September 2, 1992
    Date of Patent: October 19, 1993
    Assignee: Dow Corning Corporation
    Inventors: Russell K. King, Chi-long Lee
  • Heat stable acrylamide polysiloxane composition
    Patent number: 5246979
    Abstract: The heat stability of acrylamide functional polydiorganosiloxanes which cure by exposure to ultraviolet radiation can be improved by the addition of nickel carboxylate, stannous naphthenate, cerium carboxylate, manganese carboxylate, aluminum carboxylate, silver carboxylate, copper undecylenate, cobalt carboxylate, mono(methacrylate) tripropoxyzirconate, mono(ethylacetoacetonate) aluminum di-(sec-butoxide), di-(ethylacetoacetonate) aluminum sec-butoxide, zinc acetylacetonate, molybdenum acetylacetonate, and dibutyltin dicarboxylate.
    Type: Grant
    Filed: May 31, 1991
    Date of Patent: September 21, 1993
    Assignee: Dow Corning Corporation
    Inventors: Michael A. Lutz, Kristen A. Scheibert
  • Room temperature-curable organopolysiloxane composition
    Patent number: 5247011
    Abstract: An extrudable, self-extinguishing, room temperature-curable organopolysiloxane is obtained by combining a polydiorganosiloxane having hydrolyzable groups at the terminals, aluminum hydroxide microparticles having diameters not exceeding 50 micrometers, calcium carbonate microparticles having diameters not exceeding 20 micrometers, platinum or a platinum compound, and silane or siloxane containing at least three hydrolyzable groups.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: September 21, 1993
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Yuichi Tsuji, Miyoji Fukayama
  • Rapid cure room temperature vulcanizable organosiloxane compositions
    Patent number: 5238988
    Abstract: Room temperature vulcanizable silicone sealants containing acetoxy groups are fast curing. These sealants give off only small amounts of volatile materials which are generated during the curing process. These sealants contain crosslinkers and optionally chain extenders having azasilacycloalkane groups cure.
    Type: Grant
    Filed: January 2, 1992
    Date of Patent: August 24, 1993
    Assignee: Dow Corning Corporation
    Inventors: Russell K. King, Chi-long Lee
  • Azasilacycloalkyl functional alkoxysilanes and azasilacycloalkyl functional tetramethyldisiloxanes
    Patent number: 5239099
    Abstract: Azasilacycloalkyl functional alkoxysilane which are useful for making polymers for room temperature vulcanizable composition and as adhesion promoters are exemplified by 1-(3-(2,2,4-trimethyl-1-aza-2-silacyclopentyl)propyl)-3-(2-trimethoxysilyl ethyl)-1,1,3,3-tetramethyldisiloxane and 1-(2-(1,2,4-trimethyl-1-aza-2-silacyclopentyl)ethyl)-3-(2-trimethoxysilyle thyl)-1,1,3,3-tetramethyldisiloxane. The methoxy functional azasilacycloalkyl functional compounds can be made from disiloxanes having a silicon-bonded hydrogen atom such as 1-(3-(2,2,4-trimethyl-1-aza-silacyclopentyl)-propyl-1,1,3,3-tetramethyldis iloxane.
    Type: Grant
    Filed: September 3, 1992
    Date of Patent: August 24, 1993
    Assignee: Dow Corning Corporation
    Inventors: Russell K. King, Chi-long Lee
  • Silicone rubber composition and method for the production of silicone rubber moldings
    Patent number: 5210126
    Abstract: A silicone rubber composition is prepared by mixing a diorganopolysiloxane which contains 0.1 to 5 weight % of low-molecular-weight organosiloxane with a vapor pressure at 200.degree. C. of at least 10 mm Hg, with at least 90 weight % of a low-molecular-weight organosiloxane with a boiling point not exceeding 250.degree. C. at 760 mm Hg and a curing agent with filler being optional. These silicone rubber compositions are useful for silicone rubber moldings which can be used to in applications involving electrical switch contacts resulting in electrical switch contact conduction free of defects.
    Type: Grant
    Filed: March 27, 1991
    Date of Patent: May 11, 1993
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Yoshito Ushio, Akito Nakamura
  • Method of making organopolysiloxanes
    Patent number: 5210131
    Abstract: A method of making organopolysiloxanes comprises contacting organosilicon compounds having at least one unit ##EQU1## wherein R.degree. is hydrogen, hydroxyl, a C.sub.1-18 hydrocarbon, substituted hydrocarbon or hydrocarbonoxy group and a has a value of from 0 to 4 with a phosphonitrile halide AB, wherein A is a phosphonitrile halide cation [X(PX.sub.2 .dbd.N).sub.n PX.sub.3 ].sup.+, wherein X is halide and n is from 1 to 8 and B is an anion derived from a Lewis acid not containing a P atom, e.g. [MX.sub.(v-t+1) R.sup.2 .sub.t ].sup.-. The method is particularly useful for condensation of silanol end-blocked siloxanes.
    Type: Grant
    Filed: February 6, 1992
    Date of Patent: May 11, 1993
    Assignee: Dow Corning S.A.
    Inventors: Jean-Marc Gilson, Jean de la Croi Habimana
  • Adhesion promoter for UV curable siloxane compositions and compositions containing same
    Patent number: 5188864
    Abstract: An adhesion promoter for use with ultraviolet radiation curable siloxane composition is made by combining an alkoxysilicon compound of the formula(RO).sub.3 Si--X--Si(OR).sub.3and a compound capable of catalyzing the reaction between two alkoxy groups or an alkoxy group and a hydroxyl group. Ultraviolet radiation curable siloxane compositions with the improved adhesion are obtained by mixing the adhesion promoter with a mixture which has at least one ultraviolet radiation activatable siloxane polymer and a photoinitiator. These compositions can be used as optical fiber coatings, conformal coatings, and other coating application where adhesion to a substrate is important.
    Type: Grant
    Filed: April 2, 1991
    Date of Patent: February 23, 1993
    Assignee: Dow Corning Corporation
    Inventors: Chi-long Lee, Michael A. Lutz
  • Conductive adhesive and article made therewith
    Patent number: 5173765
    Abstract: A conductive adhesive for bonding semiconductor pellets to tabs is made from a conductive addition reaction-curing silicone rubber composition which contains.ltoreq.500 ppm of low-molecular-weight siloxane which has a vapor pressure.gtoreq.10 mmHg at 200.degree. C. The conductive adhesive can contain a metal micropowder such as gold, silver, nickel or copper.
    Type: Grant
    Filed: November 29, 1990
    Date of Patent: December 22, 1992
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Kazumi Nakayoshi, Katsutoshi Mine
  • Silicone composition which does not cause faulty conduction at electrical contacts, and method for preventing conduction faults
    Patent number: 5171482
    Abstract: A silicone composition containing a carboxylic acid amide which develops a vapor pressure during its use in an electrical device prevents faulty conduction at electrical contacts which are caused by silicone vapor. Electrical devices made by bringing the vapor of the carboxylic acid in the presence of the silicone vapor exhibit extended useful lives.
    Type: Grant
    Filed: August 23, 1990
    Date of Patent: December 15, 1992
    Assignee: Dow Corning Toray Silicone Co., LTD
    Inventor: Hiroyuki Asai
  • Fast ultraviolet radiation curing silicone composition
    Patent number: 5169879
    Abstract: Compositions which cure by UV radiation in less than one second are obtained by mixing an alkenyl containing polydiorganosiloxane, a mercapto functional crosslinker of the mercapto functional polyorganosiloxane or mercapto organic compounds, a photosensitizer, a viscosity stabilizer, and optionally a reinforcing agent. These compositions can be packaged in one container and can be used as the primary coating for optical fibers.
    Type: Grant
    Filed: April 19, 1990
    Date of Patent: December 8, 1992
    Assignee: Dow Corning Corporation
    Inventors: Chi-long Lee, Michael A. Lutz
  • Method for reducing the quantity of siloxane oligomer in organopolysiloxane moldings
    Patent number: 5167883
    Abstract: A method of improving the efficient depletion of the siloxane oligomer present in organopolysiloxane moldings by using supercritical carbon dioxide gas, so that this reduction in siloxane oligomer content is accomplished without cracking of the moldings by regulating the pressure reduction to less than 40 Kg/cm.sup.2 per 1 hour during the release to atmospheric pressure.
    Type: Grant
    Filed: December 26, 1990
    Date of Patent: December 1, 1992
    Assignee: Dow Corning Toray Silicone Company, Ltd.
    Inventors: Takao Takemasa, Masaru Kobayashi, Mitsuo Hamada