Patents Assigned to The Dow Chemical Company
  • Preparation of halofluorobenzenes
    Patent number: 4937397
    Abstract: Chlorofluorobenzenes and difluorobenzenes are prepared by contacting a dichlorobenzene with an effective amount of KF or CsF in a polar aprotic solvent at an elevated temperature under substantially anhydrous conditions. The product can be removed as it is formed or the reaction may be run at the autogenous pressures generated by the reaction mixture in a sealed reactor.
    Type: Grant
    Filed: November 28, 1988
    Date of Patent: June 26, 1990
    Assignee: The Dow Chemical Company
    Inventors: R. Garth Pews, James A. Gall
  • Preparation of 3,4-difluorobenzotrifluoride
    Patent number: 4937396
    Abstract: 3,4-Difluorobenzotrifluoride is prepared by contacting a 3,4-dihalobenzotrifluoride with an effective amount of KF or CsF in a polar aprotic solvent at an elevated temperature under substantially anhydrous conditions. The product can be removed as it is formed or the reaction may be run at the autogenous pressures generated by the reaction mixture in a sealed reactor.
    Type: Grant
    Filed: November 28, 1988
    Date of Patent: June 26, 1990
    Assignee: The Dow Chemical Company
    Inventors: R. Garth Pews, Jack C. Little, James A. Gall
  • Elastomeric optical interference films
    Patent number: 4937134
    Abstract: The present invention provides improved elastomeric interference films which are readily coextruded, have improved transparency, and have greater mismatches of refractive indices than those of the prior art. An improved elastomeric optical interference film comprising at least 100 alternating layers of at least first and second divergent substantially transparent elastomeric polymeric materials is provided. Adjacent layers of the first and second polymeric materials differ from each other in refractive index by at least about 0.05, and the thickness of the layers is from about 0.05 to about 0.5 micrometers. Stretching the films results in different wavelengths of light being reflected.
    Type: Grant
    Filed: April 17, 1989
    Date of Patent: June 26, 1990
    Assignee: The Dow Chemical Company
    Inventors: Walter J. Schrenk, William E. Shrum, John A. Wheatley
  • Composite paper reinforced thermoplastic sheet
    Patent number: 4937145
    Abstract: A three layer structural sheet material having improved resistance to delamination comprising a core layer of a composite paper having outer surface layers of thermoplastic resin adhered to both major surfaces thereof.
    Type: Grant
    Filed: November 21, 1988
    Date of Patent: June 26, 1990
    Assignee: The Dow Chemical Company
    Inventor: Kent B. McReynolds
  • Fluorinated carbonaceous fibers
    Patent number: 4937140
    Abstract: A fiber product comprising a core of a flexible, non-flammable carbonaceous polymeric fibers having an aspect ratio greater than 10:1, and a non-electrically conductive fluorinated surface.
    Type: Grant
    Filed: July 21, 1989
    Date of Patent: June 26, 1990
    Assignee: The Dow Chemical Company
    Inventors: Francis P. McCullough, Jr., Leo J. Novak
  • Method for purifying aminomethylenephosphonic acids for pharmaceutical use
    Patent number: 4937333
    Abstract: High purity ethylenediaminetetra(methylenephosphonic acid) and 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetra(methylenephosphonic acid) are prepared by dissolving the aminomethylenephosphonic acid in an aqueous base, acidifying with a mineral acid at an elevated temperature to precipitate the crystals, maintaining the solution at an elevated temperature for a period of time sufficient to assure crystallization, cooling to a lower temperature and maintaining at that temperature for a time sufficient to precipitate the crystals and filtering the resulting crystals at that temperature, washing the crystals with water and recovering the desired high purity aminophosphonic acid. The ethylenediaminetetra(methylenephosphonic acid) is obtained in a purer state during its synthesis if the crystals are filtered hot without prior cooling.
    Type: Grant
    Filed: August 4, 1989
    Date of Patent: June 26, 1990
    Assignee: The Dow Chemical Company
    Inventors: Joseph R. Garlich, Jaime Simon, Tipton T. Masterson
  • Extrudable polymeric compositions
    Patent number: 4937279
    Abstract: The present invention is a polymeric composition with improved extrudability comprising a vinylidene chloride interpolymer and a Group IIA alkaline-earth hydroxyphosphate, which is incorporated with the vinylidene chloride interpolymer by advance addition, polymer slurry addition or, finally, by dry blending addition. The Group IIA alkaline-earth hydroxyphosphate will be present in an amount of between about 0.01 to about 5 weight percent, said weight percents being based on the total weight of the polymeric composition.
    Type: Grant
    Filed: August 11, 1988
    Date of Patent: June 26, 1990
    Assignee: The Dow Chemical Company
    Inventors: Stephen R. Betso, Duane F. Foye, G. Edwin Vrieland
  • Free radically initiated process
    Patent number: 4937175
    Abstract: Compositions comprising a free radical sensitive compound and a thermally stable substituted diazene which upon exposure to electromagnetic radiation is convertible to a thermally unstable substituted diazene may be formed and processed utilizing thermally intense techniques and thereafter the free radically initiated changes initiated by exposing the substituted diazene to light and heat.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: June 26, 1990
    Assignee: The Dow Chemical Company
    Inventors: Jerry E. White, Richard A. Wolf
  • On-line coupled liquid and gas chromatography system
    Patent number: 4935145
    Abstract: Apparatus and method for on-line coupled liquid chromatography and gas chromatography analysis includes a retention gap which allows injection of a substantial volume of sample-carrying eluent and concentrates bands, obviating adverse effects on the resolution or peak shape of the components of interest. The retention gap is used to simultaneously receive and vaporize liquid solvent in a manner highly suitable for purposes of gas chromatographically separating solutes of interest dispersed in the liquid chromatography solvent.
    Type: Grant
    Filed: May 5, 1989
    Date of Patent: June 19, 1990
    Assignee: The Dow Chemical Company
    Inventors: Hernan J. Cortes, Curtis D. Pfeiffer, Bruce E. Richter
  • Process and catalyst for hydrochlorination of hydrocarbons
    Patent number: 4935565
    Abstract: Methyl chloride is produced by contacting methanol and hydrogen chloride in the vapor phase in the presence of KZnCl.sub.3 supported on silica. The process produces methyl chloride in good yield with minimal formation of dimethyl ether as a by-product.
    Type: Grant
    Filed: August 24, 1988
    Date of Patent: June 19, 1990
    Assignee: The Dow Chemical Company
    Inventors: A. Dale Harley, Michael T. Holbrook
  • Process for producing prills
    Patent number: 4935173
    Abstract: A prilling apparatus and process for producing seed material for size enlargement processes such as a granulation process for bisphenol. The apparatus includes a fluidized bed system with a spray header therein for producing spray droplets of material in a gaseous stream such as nitrogen to form prills of less than about 1 mm diameter.
    Type: Grant
    Filed: December 23, 1988
    Date of Patent: June 19, 1990
    Assignee: The Dow Chemical Company
    Inventors: A. Michael Huey, Arthur R. Shirley, Jr., Phillip A. Forsythe
  • Free standing fluxmeter fixture with an infrared pyrometer
    Patent number: 4934830
    Abstract: An apparatus for measuring heat flow from a surface, including a heat flow measuring device for measuring heat flow from a surface; a structure for applying a relatively constant and repeatable force on the heat flow measuring device contacting the surface; a free standing support for supporting the heat flow measuring device and the force applying structure, and an infrared pyrometer for measuring the temperature of the surface.
    Type: Grant
    Filed: May 3, 1989
    Date of Patent: June 19, 1990
    Assignee: The Dow Chemical Company
    Inventors: Ronald W. Rieger, Russel T. Mack
  • Substituted triazoles and their use as fungicides
    Patent number: 4935436
    Abstract: Substituted triazole compounds, their preparation, compositions containing said compounds and the use of said compositions to control fungal infections in plants are disclosed.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: June 19, 1990
    Assignee: The Dow Chemical Company
    Inventors: Lowell D. Markley, Richard B. Rogers, Neil V. Kirby, John W. Liebeschuetz, Peter F. S. Street
  • Synthesis of 3-(2-hydroxyethyl)-2-oxazolidinones
    Patent number: 4933462
    Abstract: A 3-(substituted)-2-oxazolidinone is prepared by refluxing equimolar proportions of a dialkanolamine and dimethyl carbonate in the absence of a catalyst. A yield of at least about 90 percent of a highly pure product is obtained.
    Type: Grant
    Filed: July 25, 1988
    Date of Patent: June 12, 1990
    Assignee: The Dow Chemical Company
    Inventor: Robert D. Dawe
  • Epoxy resins containing phosphonium catalysts
    Patent number: 4933420
    Abstract: Epoxide compounds and phenolic compounds are reacted in the presence of phosphonium compounds represented by the formula .crclbar.Z'R.sup.1 R.sup.2 R.sup.3 P.sym.-Z-P.sym.R.sup.1 R.sup.2 R.sup.3 Z'.crclbar. wherein each R.sup.1, R.sup.2 and R.sup.3 is independently an aromatic group or an inertly substituted aromatic group; Z is --(C(R.sup.4).sub.2).sub.a --; each R.sup.4 is independently hydrogen or a hydrocarbyl group containing from 1 to about 20 carbon atoms; Z' is any suitable anion and a has a value of at least 4.
    Type: Grant
    Filed: September 23, 1988
    Date of Patent: June 12, 1990
    Assignee: The Dow Chemical Company
    Inventors: Ha Q. Pham, Loan A. Ho
  • Process for reduction of chlorinated solvent emissions
    Patent number: 4932984
    Abstract: Chlorinated solvents are removed from vapor vent streams containing the solvent, water and non-condensable vapors by contacting the vent stream with a liquid spray of precooled chlorinated solvent at a temperature less than the freezing point of water. The solid ice floats on the liquid chlorinated solvent and can be readily separated therefrom.
    Type: Grant
    Filed: July 27, 1989
    Date of Patent: June 12, 1990
    Assignee: The Dow Chemical Company
    Inventor: Robert J. Nankee
  • Homogeneous copolymerization of non-polar monomers with ionic amphiphilic monomers
    Patent number: 4933405
    Abstract: Ionic copolymers exhibiting uniform, gel-free solution viscosity aned a controllable melt viscosity and hot melt tension are prepared by copolymerizing in an oil phase a nonionic monomer such as styrene or an alkylacrylate with an ionic monomer such as zinc dodecyl maleate or didodecyldimethylammonium p-styrene sulfonate.
    Type: Grant
    Filed: June 10, 1986
    Date of Patent: June 12, 1990
    Assignee: The Dow Chemical Company
    Inventor: Syamalarao Evani
  • Bituminous materials
    Patent number: 4933384
    Abstract: A composition useful as a pavement material comprising a mixture of asphalt and a polymer of an .alpha.-olefin, or an interpolymer of an .alpha.-olefin, and at least one copolymer selected from the group consisting of an .alpha.,.beta.-unsaturated carboxylic acid, a monomer of an .alpha.,.beta.-unsaturated carboxylic acid, a vinyl ester of alkanoic acid, and carbon monoxide.
    Type: Grant
    Filed: January 10, 1986
    Date of Patent: June 12, 1990
    Assignee: The Dow Chemical Company
    Inventor: David L. Wolfe
  • Poly(alkylene carbonate) polyols as antistatic additives for polyurethanes
    Patent number: 4931486
    Abstract: This invention relates to polyisocyanate-based polymers prepared by reacting a polyisocyanate with a polyol composition containing a polyester polyol and a poly(alkylene carbonate) polyol. The presence of the poly(alkylene carbonate) polyol improves the semi-conductive properties of the polymer without requiring the use of semi-conductive fillers or ionizable salts.
    Type: Grant
    Filed: December 2, 1988
    Date of Patent: June 5, 1990
    Assignee: The Dow Chemical Company
    Inventor: Michael O. Myers
  • Process for forming a plastic article from a plurality of layers of thermoplastic material
    Patent number: 4931121
    Abstract: A process for forming a plastic article, such as a container, involves heating at least one or more layers individually to temperatures below the melting point, immediately stacking two or more layers while retaining the peripheral portion of the layers and immediately forming the stacked layers into a plastic article which is then allowed to cool. Alternatively after stacking the layers, the stacked layers are immediately forged into a preform in a heated and lubricated mold and immediately thermoformed into a plastic article, which is then allowed to cool. The layers may be diverse (i.e. material, shape, molecular weight, additives, etc.) or similar and stacked so as to provide a layered angular orientation.
    Type: Grant
    Filed: May 23, 1985
    Date of Patent: June 5, 1990
    Assignee: The Dow Chemical Company
    Inventors: Otto C. Raspor, James C. Pawloski