Patents Assigned to Dow Corning
  • Silane compounds
    Patent number: 4625031
    Abstract: The invention disclosed in this application is the use of novel silanes in curable coatings to allow tinting or dyeing of the coatings after they are cured on certain substrates.An example of one such useful silane is ##STR1## The silanes and the curable coatings are also useful as antistat and antifog coatings.
    Type: Grant
    Filed: June 10, 1985
    Date of Patent: November 25, 1986
    Assignee: Dow Corning Corporation
    Inventors: Loren A. Haluska, Marcelle G. Molzahn
  • Ring of light laser optics system
    Patent number: 4623776
    Abstract: This invention provides a simplified laser optics system for generating a ring-shaped beam of laser radiation which is used for contouring and severing a curved, particularly a dome-shaped, article such as a silicone elastomer contact lens from a workpiece. The laser optics system consists essentially of a focussing element having a convex surface which receives a circular beam of laser radiation and an opposed conical surface forming an axicon which element transforms the circular beam into a ring-shaped beam of laser radiation. The ring-shaped beam is received by a reflective element having a conical reflective surface which causes the beam to impinge upon the curved workpiece surface, preferably at an angle which is substantially perpendicular to the workpiece surface, to accomplish edge contouring and severing of the article from the workpiece.
    Type: Grant
    Filed: January 3, 1985
    Date of Patent: November 18, 1986
    Assignee: Dow Corning Corporation
    Inventors: Richard A. Buchroeder, Eric M. Palmer, Yefim P. Sukhman
  • Curable organosiloxane compositions containing an emulsified epoxide compound and elastomeric materials prepared therefrom
    Patent number: 4623694
    Abstract: This invention relates to oil-in-oil emulsions wherein the continuous phase comprises at least one carboxyalkyl terminated polydiorganosiloxane and the dispersed phase comprises at least one epoxide compound selected from diglycidyl ethers of di- and bis-phenols. The emulsions also include a curing catalyst in addition to an dispersing agent for the epoxide compound, and can be cured with heating to form elastomeric materials exhibiting properties characteristics of silicone rubber.
    Type: Grant
    Filed: November 18, 1985
    Date of Patent: November 18, 1986
    Assignee: Dow Corning Corporation
    Inventor: Joseph W. Keil
  • Method of preparing polyorganosiloxane emulsions having small particle size
    Patent number: 4620878
    Abstract: A method of preparing fine polyorganosiloxane emulsions with an average particle size of less than 0.3 micron and polyorganosiloxane microemulsions with an average particle size of less than 0.14 micron is described. A translucent oil concentrate is prepared by mixing a polyorganosiloxane which contains polar groups, a surfactant which is insoluble in the polyorganosiloxane, and sufficient water to obtain a translucent mixture. The translucent oil concentrate is then rapidly dispersed in water to form the desired fine emulsion or microemulsion. In general, if the translucent oil concentrate is not transparent a fine emulsion with an average particle size of less than 0.3 micron is obtained; whereas, if the oil concentrate is transparent, a microemulsion with an average particle size of less than 0.14 micron is obtained.
    Type: Grant
    Filed: October 17, 1983
    Date of Patent: November 4, 1986
    Assignee: Dow Corning Corporation
    Inventor: Ronald P. Gee
  • Method of producing aqueous latex of crosslinked polydiorganosiloxane
    Patent number: 4618645
    Abstract: A method of producing an emulsion of crosslinked polydiorganosiloxane admixes hydroxyl endblocked polydiorganosiloxane, alkoxy silicone compound, anionic emulsifying agent, and water. The mixture is homogenized, then the emulsion is admixed with surface active anionic catalyst. Maintaining the catalyzed emulsion, having a pH of less than 5, at room temperature allows the ingredients to react to raise the molecular weight of the polydiorganosiloxane and to crosslink the polymer. The reaction is halted by adding sufficient base to raise the pH to greater than 7. The resultant latex yields an elastomer upon removal of the water. When colloidal silica is also added to the mixture before homogenization, the final latex yields a reinforced elastomer upon removal of the water.
    Type: Grant
    Filed: May 24, 1985
    Date of Patent: October 21, 1986
    Assignee: Dow Corning Corporation
    Inventors: Therese M. Bauman, David J. Huebner
  • Process to prepare 2-phenylpropyl containing polydiorganosiloxanes
    Patent number: 4618665
    Abstract: A method of preparing a copolymer of methyl(2-phenylpropyl)siloxy units and dialkylsiloxy units is disclosed. The method hydrolyzes methyl(2-phenylpropyl)dichlorosilane to yield a reaction product of primarily methyl(2-phenylpropyl)disiloxanediol, then copolymerizes the reaction product with dialkylcyclosiloxane to give the copolymer. The copolymer has a crystallinity point of less than -50.degree. C. It is useful in producing silicone elastomers and sealants having a comparably low crystallinity point.
    Type: Grant
    Filed: January 13, 1986
    Date of Patent: October 21, 1986
    Assignee: Dow Corning Corporation
    Inventors: Joseph T. Braun, Schuyler B. Smith
  • Silicone water-based caulking material
    Patent number: 4618642
    Abstract: An aqueous silicone elastomeric emulsion is a storage stable, paste-type material useful as a caulking material. The caulking material is obtained by mixing an anionic emulsion containing dispersed particles of hydroxyl endblocked polydiorganosiloxane, dialkyltindicarboxylate, silane of the formula RSi(OR').sub.3 where R is a monovalent hydrocarbon radical of from 1 to 4 carbon atoms inclusive and R' is a lower alkyl radical of from 1 to 4 carbon atoms inclusive or a radical of the formula --N.dbd.CR.sub.2, and inert, non-siliceous filler.
    Type: Grant
    Filed: May 2, 1985
    Date of Patent: October 21, 1986
    Assignee: Dow Corning Corporation
    Inventor: Christine J. Schoenherr
  • Oil and water repellent coating compositions
    Patent number: 4617057
    Abstract: An oil and water repellent coating composition is disclosed. The composition comprises a blend of an aminoorganosilane, a perfluorinated organic compound and a resin selected from the group consisting of colloidal inorganic-based siloxane resin, poly (dialkylsiloxane)-monoorgano substituted silsesquioxane block copolymer, acrylic polymer and copolymer, ethylene-vinyl acetate latex and styrene-butadiene latex. The silane and perfluorinated organic, combined, constitute from 0.1% to 10% by weight of the total resin solids in a solution or suspension of the blend. A method of coating a smooth substrate or treating a fabric to render the respective surface oleophobic and hydrophobic is further disclosed.
    Type: Grant
    Filed: June 4, 1985
    Date of Patent: October 14, 1986
    Assignee: Dow Corning Corporation
    Inventor: Edwin P. Plueddemann
  • Shape retention tissue expander and method of using
    Patent number: 4615704
    Abstract: This invention relates to an implantable, inflatable dual chamber shape retention tissue expander having a resilient annular base and a generally hemispherical shape after inflation which is used to form a generally hemispherical pocket beneath the tissue to be expanded to, for example, provide an appropriately shaped pocket for the receipt of an implantable mammary prosthesis and to a method of using such a tissue expander.
    Type: Grant
    Filed: November 26, 1984
    Date of Patent: October 7, 1986
    Assignee: Dow Corning Corporation
    Inventor: Eldon E. Frisch
  • Low consistency, one-part silicone elastomers
    Patent number: 4614760
    Abstract: A one-part silicone elastomeric composition that is flowable or easily extruded is prepared by mixing a hydroxyl endblocked polydiorganosiloxane, a difunctional silane having two amido radicals, and an organic peroxide suitable for vulcanizing silicone rubber. A nonacidic filler is optional. After being put in place, the composition is exposed to moisture to activate a chain extension reaction that increases the molecular weight of the polydiorganosiloxane, to improve the physical properties of the cured silicone elastomer. After chain extension has taken place, the composition is heated to activate the organic peroxide, thereby crosslinking the composition into a silicone elastomer. The composition is useful as a potting and encapsulating material.
    Type: Grant
    Filed: September 27, 1985
    Date of Patent: September 30, 1986
    Assignee: Dow Corning Corporation
    Inventors: Gary R. Homan, Chi-Long Lee
  • Water-blown silicone foam
    Patent number: 4613630
    Abstract: This invention relates to a method of producing silicone elastomeric foam of low density. The method mixes polydiorganosiloxanes having hydroxyl endblocking or vinyl endblocking or mixtures of both along with water to react with silicon hydride in the presence of platinum catalyst to release hydrogen gas to create a froth which cures to a foam. The combination of ingredients allows the manufacture of silicone foam having different combinations of properties than those obtained from previous methods. Embodiments of the invention also make use of specific profoamers and specific alcohols to further modify the properties of the foams produced. The method of this invention yields a low cost, low density, silicone elastomeric foam having physical properties which enable it to be used in cushioning and sealing applications.
    Type: Grant
    Filed: March 3, 1986
    Date of Patent: September 23, 1986
    Assignee: Dow Corning Corporation
    Inventors: Therese M. Bauman, John E. Dietlein
  • Method for removing lipid deposits from contact lenses
    Patent number: 4613380
    Abstract: This invention relates to a method for removing lipid deposits from contact lenses of a polymeric material, particularly contact lenses wherein at least a portion of the polymeric material is an organosilicon compound, by contacting the contact lens surfaces with certain volatile methylsiloxane fluids such as octamethylcyclotetrasiloxane and thereafter removing the fluid and the lipids removed from the contact lens. This method is especially useful for removing lipid deposits from silicone elastomer contact lenses.
    Type: Grant
    Filed: April 1, 1985
    Date of Patent: September 23, 1986
    Assignee: Dow Corning Corporation
    Inventor: Jie Chen
  • Bonding surfaces with permanent-bond adhesive
    Patent number: 4613534
    Abstract: This invention relates to a method of permanently bonding surfaces coated with elastoplastic organopolysiloxane resin or polytetrafluoroethylene resin. The method of bonding these difficult to adhere surfaces consists essentially of applying to the surface sufficient adhesive to yield at least a 0.1 mm coating of an adhesive comprising the product obtained by mixing (i) 9 to 70 percent by weight of a solid benzene soluble silicone resin copolymer, (ii) 30 to 91 percent by weight of a hydroxyl endlblocked polydiorganosiloxane gum having a viscosity of greater than 10,000 Pa.sup.. s, (iii) an organohydrogenpolysiloxane compatible with (i) and (ii), (iv) a soluble tin catalyst, and (v) a non-reactive solvent. The applied adhesive is allowed to become tacky, then the tacky surfaces are placed firmly together and allowed to cure.
    Type: Grant
    Filed: January 23, 1985
    Date of Patent: September 23, 1986
    Assignee: Dow Corning Corporation
    Inventors: John D. Blizzard, Bernard VanWert
  • Low temperature polymethylsiloxane containing silicon-bonded hydrogen and curable compositions made therewith
    Patent number: 4613659
    Abstract: Polymethylsiloxanes containing silicon-bonded hydrogen exhibit low temperature properties and can be made into gels with which also exhibit low temperature properties or into elastomeric materials. The polymethylsiloxanes have 84 to 96 mole percent dimethylsiloxane units, 0.5 to 6 mole percent trimethylsiloxy units, 2 to 10 mole percent methylsilsesquioxane units, and 0.25 to 3 mole percent monohydrogendimethylsiloxy units and the total mole percent of the trimethylsiloxy units and the monohydrogendimethylsiloxy units is at least 1.5.
    Type: Grant
    Filed: December 16, 1985
    Date of Patent: September 23, 1986
    Assignee: Dow Corning Corporation
    Inventors: Chi-long Lee, Myron T. Maxson
  • Resinous copolymeric siloxanes containing alkenyldimethylsiloxanes
    Patent number: 4611042
    Abstract: A xylene-soluble, resinous copolymer containing SiO.sub.2 units, trimethylsiloxane units, and alkenyldimethylsiloxane units such as 5-hexenyldimethylsiloxane units is disclosed. The resinous copolymer is useful as a component in silicone coatings, especially silicone release coatings, to provide intermediate range release forces against adhesives. The higher alkenyl functionality provides faster reaction with other coating components and reduced odor during cure of UV curable mercaptosilicone compositions.
    Type: Grant
    Filed: October 3, 1985
    Date of Patent: September 9, 1986
    Assignee: Dow Corning Corporation
    Inventors: Stacia A. Rivers-Farrell, Antony P. Wright
  • Silicone water-based emulsions having improved shelf life
    Patent number: 4609486
    Abstract: The shelf life of an aqueous, anionic silicone emulsion, which contains an organic tin compound and which forms an elastomer upon removal of the water, is improved by the addition of an additive. The additive is selected from the group consisting of alkyl mercaptan, 8-quinolinol, thioglycolic acid, and salts of thioglycolic acid. Elastomers produced by removing the water from these emulsions, once shelf aged, have more consistent physical properties than do elastomers produced from similar emulsions not containing the additives.
    Type: Grant
    Filed: February 25, 1985
    Date of Patent: September 2, 1986
    Assignee: Dow Corning Corporation
    Inventors: Alan L. Freiberg, Daniel Graiver, Thomas F. Lim, Antony P. Wright
  • Silicone release coatings containing higher alkenyl functional siloxanes
    Patent number: 4609574
    Abstract: An improved, curable, silicone, release coating composition is provided which cures more rapidly, at lower temperature, and with less residual reactive functionality. The composition contains siloxane polymers bearing higher alkenyl groups with 6 or more carbon atoms and cures by the metal catalyzed reaction of SiH with the alkenyl groups. An improved on-line process for preparing release laminates of substrates and adhesive using the coating composition is further provided.
    Type: Grant
    Filed: October 3, 1985
    Date of Patent: September 2, 1986
    Assignee: Dow Corning Corporation
    Inventors: John R. Keryk, Peter Y. K. Lo, LeRoy E. Thayer
  • Method of producing elastomeric silicone foam
    Patent number: 4608396
    Abstract: A method of producing elastomeric silicone foams from a two-part system is disclosed. The method mixes the ingredients then allows a froth to form and cure at ambient temperature to an elastomeric silicone foam. The method mixes a vinyl-containing polydiorganosiloxane (1), a hydroxylated polydiorganosiloxane (2), a platinum catalyst (3), an organohydrogensiloxane (4) and a profoamer (5). The profoamer is a resinous, benzene-soluble organosiloxane copolymer consisting essentially of SiO.sub.4/2 units, silicone bonded hydroxyl groups, (CH.sub.3).sub.3 SiO.sub.1/2 units, and fluorine-containing units. An embodiment of the method includes a liquified blowing agent and stores the mixture under superatmospheric pressure, forming a foam by releasing the mixture to atmospheric pressure. Another embodiment includes an alcohol in the mixture to provide a foam of lower density.
    Type: Grant
    Filed: February 3, 1986
    Date of Patent: August 26, 1986
    Assignee: Dow Corning Corporation
    Inventors: Therese M. Bauman, Chi-Long Lee, James A. Rabe
  • Acylamino silicon compounds, their use and preparation
    Patent number: 4608270
    Abstract: Organosilicon compounds containing at least one acylamino-substituted hydrocarbon radical are prepared by reacting an organosilicon compound containing at least one amino-substituted hydrocarbon radical with an acyl halide in the presence of an aqueous solution of an alkaline material and a solvent for the aminosilicon compound. The reaction is particularly useful for preparing polydiorganosiloxanes which contain one or more acrylylamino-substituted hydrocarbon radicals, which are polymerizable and are useful in coating compositions such as adhesive release coating compositions.
    Type: Grant
    Filed: October 25, 1985
    Date of Patent: August 26, 1986
    Assignee: Dow Corning Corporation
    Inventor: Padmakumari J. Varaprath
  • Stabilization of silicates using salts of substituted nitrogen or sulfur containing siliconates
    Patent number: RE32250
    Abstract: Salts of substituted nitrogen or sulfur containing siliconates are effective stabilizers for aqueous silicates in such applications as treating boiler water, geothermal water and other aqueous silicates. They are also useful in antifreeze and cooland solutions.
    Type: Grant
    Filed: July 11, 1983
    Date of Patent: September 23, 1986
    Assignee: Dow Corning Corporation
    Inventor: Edwin P. Plueddemann