Patents Represented by Attorney Sharon K. Severance
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Patent number: 5616202Abstract: Disclosed is a method of increasing the adhesion between gold and silica derived from hydrogen silsesquioxane resin. The method comprises joining the gold and silica followed by annealing under an oxidizing atmosphere.Type: GrantFiled: June 26, 1995Date of Patent: April 1, 1997Assignee: Dow Corning CorporationInventors: Robert C. Camilletti, Grish Chandra, Keith W. Michael
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Patent number: 5614603Abstract: The introduction of a highly spin-coatable silicone resin that does not produce large amounts of volatiles during its cure, and that is a precursor to highly heat-resistant, optically transparent cured products that exhibit an excellent hardness. The silicone resin comprises a silicone polymer of the general formula:(Ph.sub.2 SiO).sub.a (HSiO.sub.3/2).sub.b (R.sup.1 SiO.sub.3/2).sub.cin which R.sup.1 is hydrogen or C.sub.1 to C.sub.8 hydrocarbon group, possibly containing a heteroatom, Ph is a phenyl group and 6.ltoreq.a+b+c.ltoreq.1,000, 0.6>a/(a+b+c).gtoreq.0.4, and 1.0.gtoreq.b/(b+c).gtoreq.0.2.Type: GrantFiled: January 31, 1996Date of Patent: March 25, 1997Assignee: Dow Corning Asia, Ltd.Inventors: Brian R. Harkness, Mamoru Tachikawa, Kasumi Takeuchi
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Patent number: 5609925Abstract: A low temperature method of forming silica-containing ceramic coatings on substrates in which a coating containing hydrogen silsesquioxane resin is applied on a substrate and exposed to an electron beam for a time sufficient to convert the hydrogen silsesquioxane resin to the silica-containing ceramic coating. This method is especially valuable for forming protective and dielectric coatings on electronic devices.Type: GrantFiled: December 4, 1995Date of Patent: March 11, 1997Assignees: Dow Corning Corporation, National Semiconductor CorporationInventors: Robert C. Camilletti, Irfan Saadat, Michael Thomas
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Patent number: 5607721Abstract: 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: GrantFiled: May 15, 1995Date of Patent: March 4, 1997Assignee: Dow Corning CorporationInventors: Katherine L. Ulman, Randall P. Sweet, Loren D. Durfee
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Patent number: 5597584Abstract: The instant invention pertains to a method of controlling release of active agents or drugs from a silicone rubber matrix by controlling the degree of crosslinking in the silicone rubber matrix. The silicone rubber matrixes of the instant invention are produced from liquid silicone rubbers comprised of (A) a polyorganosiloxane containing at least two alkenyl radicals per molecule; (B) an organohydrogensiloxane containing at least two silicon-bonded hydrogen atoms per molecule; and (C) a hydrosilylation catalyst in an amount sufficient to promote curing of said composition.Type: GrantFiled: August 2, 1995Date of Patent: January 28, 1997Assignee: Dow Corning CorporationInventors: Padmanabh P. Bhatt, Victor A. Raul
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Patent number: 5597648Abstract: Pressure sensitive adhesives (PSA) having a reduced volatile fraction content are provided by a process which comprises extracting a cured PSA with a fluid in or near its supercritical state. The process provides PSAs and articles containing PSAs which meet the volatility requirements of ASTM E-595. A silicone PSA transfer film having utility in outer space is obtained.Type: GrantFiled: October 18, 1991Date of Patent: January 28, 1997Assignee: Dow Corning CorporationInventors: Larry F. Hanneman, Val Krukonis, Thomas J. Tangney, James J. Watkins
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Patent number: 5565540Abstract: The present invention pertains to a method for the preparation of organosiloxane oligomer with the general formulaR.sup.1.sub.3 SiO(R.sup.2.sub.2 SiO).sub.n Hwhere each R.sup.1 and R.sup.2 are independently monovalent hydrocarbon groups and n has a value of 1 to 10; wherein the method comprises cohydrolyzing a triorganohalosilane and diorganodihalosilane in the presence of a basic compound in a two-layer liquid system comprised of an aqueous layer and an organic solvent layer. The method of the instant invention is a high-yield method for the preparation of organosiloxane oligomer having the silicon-bonded hydroxyl group at only one molecular chain terminal.Type: GrantFiled: July 21, 1993Date of Patent: October 15, 1996Assignee: Dow Corning Toray Silicon Co., Ltd.Inventors: Tadashi Okawa, Shuji Yamada
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Patent number: 5561203Abstract: Silicone pressure sensitive compositions that combine high ultimate strength in a cured network with a lower modulus and have improved adhesive strength at elevated temperatures are disclosed. The pressure sensitive adhesive compositions are comprised of (A) a soluble, capped, organopolysiloxane resin containing less than 1.2 weight percent silicon-bonded hydroxyl groups based on the total weight of (A); (B) a diorganopolysiloxane polymer, each terminal group thereof containing at least two silicon-bonded hydrolyzable radicals said polymer having a viscosity at 25.degree. C. of 20 to 100,000 mm.sup.2 /s; and (C) a hydrolyzable silane.Type: GrantFiled: April 13, 1995Date of Patent: October 1, 1996Assignee: Dow Corning CorporationInventors: Michael R. Strong, Bernard VanWert, Martin E. Cifuentes
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Patent number: 5545700Abstract: Silicone pressure sensitive adhesive compositions which cure in the presence of moisture comprise an adhesive component which bears alkoxy radical-containing curing radicals and, optionally, a catalyst to accelerate the reaction of moisture with the alkoxy radicals to form siloxane bonds. Curing provides adhesives ranging from pressure sensitive adhesives having improved properties to permanent adhesives. The adhesives are useful for adhering an object to a surface and thereafter improving the bond between the object and the surface by exposure to moisture.Type: GrantFiled: January 10, 1994Date of Patent: August 13, 1996Assignee: Dow Corning CorporationInventors: Shawn K. Mealey, Randall G. Schmidt, William P. Brady
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Patent number: 5545682Abstract: The introduction of release coating-forming silicone compositions that yield cured release coatings that exhibit excellent release properties against tacky substances and do not impair the residual adhesion of tacky substances.Silicone composition for the formation of cured release coatings, that characteristically comprises(A) 100 weight parts of a cured coating-forming silicone composition into which there is admixed(B) 0.5 to 500 weight parts organosilicon polymer with the following average unit formula ##STR1## wherein R represents C.sub.1 to C.sub.10 monovalent hydrocarbon groups that are free of aliphatic unsaturation; R.sup.1 represents organic groups selected from the group consisting essentially of C.sub.2 to C.sub.20 alkylene groups and organic groups with the formulas --R.sup.3 (OR.sup.3).sub.y -- and --R.sup.3 --(R.sub.2 SiO).sub.z R.sub.2 Si--R.sup.3 -- (R is defined as above, R.sup.3 denotes C.sub.2 to C.sub.Type: GrantFiled: May 23, 1995Date of Patent: August 13, 1996Assignee: Dow Corning Silicone Co., Ltd.Inventors: Nobuo Kaiya, Hideki Kobayashi
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Patent number: 5545830Abstract: Pyrene based fluorescent organopolysiloxanes which bear two or more reactive silicon-bonded sites are useful as durable markers and indicators of the degree of cure in curable silicone compositions. Having more than one reactive site the compounds participate in the curing reaction of the curable composition and thus do not adversely affect its curing behavior. The resulting fluorescent curable compositions are particularly useful in the preparation of adhesive-release coatings.Type: GrantFiled: December 30, 1994Date of Patent: August 13, 1996Assignee: Dow Corning CorporationInventors: Maris J. Ziemelis, Eng-Pi Chang, Mitchell A. Winnik
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Patent number: 5530075Abstract: The instant invention pertains to a curable resin composition comprised of A) 100 parts by weight curable resin, and B) 0.1-500 parts by weight of an organopolysiloxane having organic groups that contain epoxy groups, which is expressed by the formula: ##STR1## wherein R.sup.1 is a univalent hydrocarbon group excluding alkenyl groups, R.sup.2 is a hydrogen atom or a univalent hydrocarbon group excluding alkenyl groups, R.sup.3 is an alkoxysilylalkyl group or an organic group that contains epoxy groups, a is 0 or a positive integer, b is a positive integer and c is a positive integer, where a/c has the value of 0 to 4, b/c has the value of 0.05 to 4 and (a+b)/c has the value of 0.2 to 4. The curable resin composition of the instant invention has superior flowability that produces a hardened resin with superior flexibility and adhesion.Type: GrantFiled: August 15, 1994Date of Patent: June 25, 1996Assignee: Dow Corning Toray Silicone Co., Ltd.Inventors: Yoshitsugu Morita, Noriyasu Yokoyama
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Patent number: 5508360Abstract: The present invention relates to a silicone pressure-sensitive adhesive composition which cure upon exposure to ambient moisture. The moisture-curable silicone pressure-sensitive adhesive composition of the instant invention comprise:(A) an organopolysiloxane resin containing curing radicals of the formula --SiY.sub.2 ZNY'ZSiR.sup.1.sub.x Y".sub.3-x wherein R.sup.1 is a monovalent hydrocarbon radical, each Z is a divalent linking group, each Y is independently selected from the group consisting of a monovalent organic radical, an enoloxy radical, an alkoxy radical, and an oximo radical; Y' is selected from the group consisting of a monovalent organic radical, a hydrogen atom, and --ZSiR.sup.1.sub.x Y".sub.Type: GrantFiled: March 31, 1995Date of Patent: April 16, 1996Assignee: Dow Corning CorporationInventors: Martin E. Cifuentes, Michael R. Strong, Bernard VanWert, Michael A. Lutz, Randall G. Schmidt
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Patent number: 5493039Abstract: The instant invention pertains to a method for the preparation of methacryloxypropyldimethylchlorosilane that is very efficient, yields a very pure methacryloxypropyldimethylchlorosilane, and produces little alpha-methylpropionyloxypropyldimethylchlorosilane impurity.The instant invention comprises the addition reaction between allyl methacrylate and dimethylchlorosilane in the presence of hydrosilylation catalyst, wherein the water content of the allyl methacrylate does not exceed 200 ppm.Type: GrantFiled: July 17, 1995Date of Patent: February 20, 1996Assignee: Dow Corning Toray Silicone Co., Ltd.Inventors: Tadashi Okawa, Shuji Yamada
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Patent number: 5482988Abstract: 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: GrantFiled: January 14, 1994Date of Patent: January 9, 1996Assignee: Dow Corning CorporationInventors: Katherine L. Ulman, Randall P. Sweet, Loren D. Durfee
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Patent number: 5473026Abstract: A moisture-curable silicone hot melt pressure sensitive adhesive composition is disclosed, said composition comprising: (A) a solid alkoxy functional organopolysiloxane resin containing curing radicals of the formula --ZSiR.sup.1.sub.x (OR.sup.2).sub.3-x ; wherein R.sup.1 is a monovalent hydrocarbon radical, R.sup.2 is selected from the group consisting of a alkyl radical and alkoxyalkyl radical, Z is a divalent linking radical, and the subscript x has a value of 0 or 1; (B) a diorganopolysiloxane polymer, each terminal group thereof containing at least one silicon-bonded hydrolyzable functional radical selected from the group consisting of alkoxy radicals having 1 to 4 carbon atoms, ketoxime radicals, aminoxy radicals, acetamido radicals, N-methylacetamido radicals and acetoxy radicals; said polymer having a viscosity at 25.degree. C. of 20 to <100,000 mm.sup.Type: GrantFiled: June 20, 1994Date of Patent: December 5, 1995Assignee: Dow Corning CorporationInventors: Michael R. Strong, Martin E. Cifuentes, Bernard VanWert, William J. Schoenherr
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Patent number: 5470923Abstract: Silicone pressure sensitive adhesive compositions which cure in the presence of moisture comprise an adhesive component which bears alkoxy radical-containing curing radicals and, optionally, a catalyst to accelerate the reaction of moisture with the alkoxy radicals to form siloxane bonds. Curing provides adhesives ranging from pressure sensitive adhesives having improved properties to permanent adhesives. The adhesives are useful for adhering an object to a surface and thereafter improving the bond between the object and the surface by exposure to moisture.Type: GrantFiled: May 14, 1993Date of Patent: November 28, 1995Assignee: Dow Corning CorporationInventors: Robert H. Krahnke, Shawn K. Mealey, William J. Schoenherr, Schuyler B. Smith, deceased, Thomas J. Tangney
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Patent number: 5458886Abstract: Free-flowing granular compositions principally for use in treatment of gastric disorders comprise (A) titanium dioxide having a particle size within the range from 10 nanometers to 60 nanometers and a specific BET (nitrogen) surface area of at least 30 m.sup.2 /g in combination with (B) an organopolysiloxane antifoam agent (for example a mixture of from 90 to 99 percent by weight of a polydiorganosiloxane and from 1 to 10 percent by weight of a finely-divided silica having a surface area to weight ratio of at least 50 m.sup.2 /g), (B) being present in a proportion of from 30 to 70 percent by weight calculated on the combined weight of (A) and (B). The compositions may contain from 40 to 60 percent of (B) based on the combined weight of (A) and (B). They may also contain an antacid or other medicament, glycerol, an effervescent agent and/or a disintegrant component.Type: GrantFiled: May 31, 1994Date of Patent: October 17, 1995Assignee: Dow Corning France S.A.Inventor: Francois J. Briquet
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Patent number: 5436061Abstract: Pressure sensitive adhesives (PSA) having a reduced volatile fraction content are provided by a process which comprises extracting a cured PSA with a fluid in or near its supercritical state. The process provides PSAs and articles containing PSAs which meet the volatility requirements of ASTM E-595. A silicone PSA transfer film having utility in outer space is obtained.Type: GrantFiled: August 30, 1993Date of Patent: July 25, 1995Assignee: Dow Corning CorporationInventors: Larry F. Hanneman, Val Krukonis, Thomas J. Tangney, James J. Watkins
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Patent number: RE35474Abstract: This invention relates to an improved transdermal drug delivery device for the controlled transdermal delivery of amino-functional drugs. The improvement resides in providing the device with a silicone pressure-sensitive adhesive layer which has been chemically treated to reduce the silicon-bonded hydroxyl content of the pressure-sensitive adhesive composition to render the adhesive layer resistant to loss of tack and preserve the instant adherence of the device to the skin of a wearer during storage and while the device is being worn. Preferably, the composition used comprises a silicon-bonded hydroxyl radical containing resinous copolymer of R.sub.3 SiO.sub.1/2 units and SiO.sub.4/2 units and a polydiorganosiloxane which have been chemically treated with R.sub.3 SiO.sub.1/2 units where R is preferably a hydrocarbon radical such as a methyl group to reduce the silicon-bonded hydroxyl content of the adhesive and thereby its sensitivity to amino-functional drugs.Type: GrantFiled: October 13, 1994Date of Patent: March 11, 1997Assignee: Dow Corning CorporationInventors: John T. Woodard, Virgil L. Metevia