Patents Assigned to The Dows Chemical Company
  • Process for desulfurization of molten hot metals
    Patent number: 5015291
    Abstract: A process for desulfuring molten metal by injecting a desulfurization reagent into the molten metal using a carrier gas via a lance immersed in the molten metal; said desulfurization reagent comprising magnesium nitride.
    Type: Grant
    Filed: December 8, 1989
    Date of Patent: May 14, 1991
    Assignee: The Dow Chemical Company
    Inventors: Edward J. Skach, Jr., Paul S. Frederick
  • Alkylated diaryl oxide monosulfonate collectors useful in the floatation of minerals
    Patent number: 5015367
    Abstract: Alkylated diaryl oxide monosulfonic acids or salts thereof or their mixture are useful as collectors in the flotation of minerals, particularly oxide minerals.
    Type: Grant
    Filed: February 23, 1990
    Date of Patent: May 14, 1991
    Assignee: The Dow Chemical Company
    Inventors: Richard R. Klimpel, Donald E. Leonard
  • Process for preparing poly(alkylene carbonate) monoahls and polyahls useful as surfactants
    Patent number: 5015753
    Abstract: Poly(alkylene carbonate) monoahls and polyahls useful as nonionic surfactants and having a poly(alkylene carbonate) backbone are prepared by reacting an oligomeric poly(alkylene carbonate) polyahl with a compound having mono- or difunctional active hydrogen moieties, such as alcohols, carboxylic acids, mercaptans, amides, primary or secondary amines, or substituted phenols, optionally in the presence of a catalyst, under transesterification conditions.
    Type: Grant
    Filed: November 13, 1989
    Date of Patent: May 14, 1991
    Assignee: The Dow Chemical Company
    Inventor: Robert F. Harris
  • Method for preparing imide-containing polymers
    Patent number: 5015712
    Abstract: Imide-containing polymers of styrene-type monomers are prepared by a process comprising solution polymerizing under free radical polymerization conditions a polymerizable monomer composition comprising at least one vinylaromatic monomer and at least one maleamic monocarboxylic acid monomer.
    Type: Grant
    Filed: October 12, 1989
    Date of Patent: May 14, 1991
    Assignee: The Dow Chemical Company
    Inventor: Thomas H. Newman
  • Catalytic method to produce hydroxy substituted arylophenones
    Patent number: 5015778
    Abstract: Hydroxy substituted arylophenones in general, and 4,4'-dihydroxybenzophenones in particular, are produced by catalytic oxidation of diaryl compounds containing hydroxy substituted diaryl moieties in a liquid medium. Oxidation occurs by contact of the diaryl compounds with an oxygen-containing gas in the presence of a solvent, base, a metal atom catalyst, and optionally, activated carbon. The arylophenones produced are useful as monomers in the production of epoxy and polycarbonate resins.
    Type: Grant
    Filed: December 18, 1989
    Date of Patent: May 14, 1991
    Assignee: The Dow Chemical Company
    Inventors: Anthony P. Haag, E. W. Otterbacher
  • (Fluorinated phenoxy)(3-perfluoroalkylphenoxy)-cyclic phosphazenes
    Patent number: 5015405
    Abstract: Cyclic phosphazenes completely substituted with fluorinated phenoxy and m-perfluoroalkylphenoxy moieties in ratios ranging from about 1:1 to about 1:5 are disclosed. These compounds, either alone or as additives, are useful as high temperature lubricants.
    Type: Grant
    Filed: October 5, 1989
    Date of Patent: May 14, 1991
    Assignee: The Dow Chemical Company
    Inventors: Kishore K. Kar, Chester E. Pawloski
  • Process for solute recovery utilizing recycle liquids having a stored concentration profile
    Patent number: 5013449
    Abstract: The process of the invention is an adsorptive solute recovery from a dilute solution that, during elution of the adsorbent bed, stores for recycling donor and receiver portions of effluent from the bed that range in concentration from barren to just less than product concentration and just less than product concentration to barren, respectively. The donor and receiver liquids are stored such that their solute concentration profiles as they leave the bed are maintained. The donor liquid is recycled through the adsorbent bed just prior to elution while the bed is treated with the receiver liquid after elution. Steady state operation is established after a number of loading and elution cycles, resulting in improved recovery of solute, reduced recycle rates and lower adsorbent inventory requirements.
    Type: Grant
    Filed: May 26, 1989
    Date of Patent: May 7, 1991
    Assignee: The Dow Chemical Company
    Inventors: Gonzalo Garcia-Huidobro, Douglas C. Greminger
  • Closure for reclosable thermoplastic containers
    Patent number: 5012561
    Abstract: A closure for reclosable plastic containers including male and female closure elements having extremities which are suited for interlocking with one another, in which the interlocking extremities of the male and female elements are guided into interlocking engagement responsive to compressive force placed on the elements, as in the clamping together and edge-sealing of film portions carrying the elements.
    Type: Grant
    Filed: May 18, 1990
    Date of Patent: May 7, 1991
    Assignee: The Dow Chemical Company
    Inventors: Jose Porchia, John O. McCree, Brian C. Dais
  • Oxydehydrogenation of dinitriles
    Patent number: 5013860
    Abstract: Included is the oxydehydrogenation of saturated dinitriles, for example, succinonitrile, to prepare unsaturated dinitriles, for example, fumaronitrile and maleonitrile. Succinonitrile can be oxydehydrogenated by passing it in a vapor phase over a calcined calcium nickel phosphate catalyst, and the selectivity to fumaronitrile can be varied by the presence of water vapor in the vapor phase feed mixture.
    Type: Grant
    Filed: November 4, 1988
    Date of Patent: May 7, 1991
    Assignee: The Dow Chemical Company
    Inventors: Harold W. Young, Jr., William P. Dianis
  • Stabilized 1,1,1-trichloroethane
    Patent number: 5013364
    Abstract: A solvent, 1,1,1-trichloroethane, is stabilized against corrosion by the addition of 2-acetoacetoxyalkyl methacrylate. A painting formulation is prepared using the stabilized solvent.
    Type: Grant
    Filed: November 3, 1989
    Date of Patent: May 7, 1991
    Assignee: The Dow Chemical Company
    Inventors: Felipe A. Donate, James G. Papajesk
  • Polymer blends of tapered styrene-butadiene triblock thermoplastic elastomers
    Patent number: 5013790
    Abstract: A thermoplastic blend useful for the preparation of molded articles comprising a thermoplastic polymer and a tapered triblock elastomer of a monovinylidene aromatic monomer and butadiene having a melt index (condition 200/5.0 ASTM method D1238-82) of 0.5 to 60 and an average molecular weight from 50,000 to 135,000.
    Type: Grant
    Filed: July 5, 1989
    Date of Patent: May 7, 1991
    Assignee: The Dow Chemical Company
    Inventors: Lu H. Tung, Joseph J. Randazzo
  • Electrode structure for an electrolytic cell and electrolytic process used therein
    Patent number: 5013414
    Abstract: The invention is an electrode at least having a primary hydraulically permeable electrode member with a multiplicity of spaced apart depressions projecting a predetermined distance from the plane of the electrode. The invention also includes an electrolytic cell using the electrode and a method for electrolyzing an electrolyte using the cell.
    Type: Grant
    Filed: April 19, 1989
    Date of Patent: May 7, 1991
    Assignees: The Dow Chemical Company, Denora Permelec S.p.A.
    Inventors: Gregory J. E. Morris, Pierluigi A. V. Borrione, Umberto Leoni
  • Process for alkaline peroxide bleaching of wood pulp using a quaternary amine as additive
    Patent number: 5013404
    Abstract: A process for alkaline hydrogen peroxide bleaching of mechanical wood pulp which employs a quaternary amine compound, such as (3-chloro-2-hydroxypropyl)trimethyl ammonium chloride, in the stabilized bleach solution. The brightness of the final paper product made from such bleached pulp shows marked improvement over that in which only chelating agents are employed to improve the brightness according to the known art. The process is useful in both silicate and silicate-free bleach solutions.
    Type: Grant
    Filed: November 15, 1989
    Date of Patent: May 7, 1991
    Assignee: The Dow Chemical Company
    Inventors: Steven H. Christiansen, Teresa Littleton, Robert T. Patton
  • Compositions useful for making microporous polyvinylidene fluoride membranes, and process
    Patent number: 5013339
    Abstract: This invention relates a composition useful for preparing a polyvinylidene fluoride polymer membrane containing (1) a polyvinylidene fluoride polymer, (2) glycerol monoacetate, glycerol diacetate, glycerol triacetate, or mixtures thereof, and (3) optionally glycerol, wherein the polyvinylidene fluoride polymer membrane prepared from the composition is useful for a membrane liquid separation process such as microfiltration, ultrafiltration, dialysis, or membrane stripping. In another aspect, this invention is an improved process for using the composition to prepare a polyvinylidene fluoride polymer membrane by forming a mixture of the composition, heating the mixture to a temperature at which the mixture becomes a homogeneous fluid, and extruding, molding, or casting the homogeneous fluid into a membrane.
    Type: Grant
    Filed: December 5, 1989
    Date of Patent: May 7, 1991
    Assignee: The Dow Chemical Company
    Inventors: Robert D. Mahoney, Richard A. Lundgard
  • Hollow fiber membrane fluid separation device adapted for boreside feed which contains multiple concentric stages
    Patent number: 5013437
    Abstract: The invention is a hollow fiber membrane fluid separation device specially adapted for boreside feed which contains multiple concentric stages.
    Type: Grant
    Filed: August 24, 1990
    Date of Patent: May 7, 1991
    Assignee: The Dow Chemical Company
    Inventors: Johnny L. Trimmer, Terrence L. Caskey, Janine L. Jorgensen
  • Process of preparing non-cyclic polyalkylenepolyamines employing group VB metal catalysts
    Patent number: 5011999
    Abstract: A process for the preparation of predominantly non-cyclic polyalkylenepolyamines comprising contacting a difunctional aliphatic alcohol with ammonia or a primary or secondary aliphatic amine in the presence of a catalyst selected from the group consisting of Group VB metal oxides, niobium phosphates, tantalum phosphates, and mixtures thereof. For example, monoethanolamine is aminated by ethylenediamine to predominantly linear and branched polyethylenepolyamines in the presence of a catalyst containing niobium oxide supported on boehmite alumina.
    Type: Grant
    Filed: February 23, 1989
    Date of Patent: April 30, 1991
    Assignee: The Dow Chemical Company
    Inventors: Robert G. Bowman, George E. Hartwell, David C. Molzahn, Enrique G. Ramirez, John E. Lastovica, Jr.
  • Insulating alkenyl aromatic polymer foam
    Patent number: 5011866
    Abstract: Alkenyl aromatic thermoplastic synthetic resinous elongate foam bodies having a machine direction, a traverse direction and closed noninterconnecting gas-containing cells are prepared using at least 70 percent by weight of 1,1,1-trifluoroethane and or 1,1,1,2-tetrafluoroethane as a blowing agent or part of a blowing agent mixture. These foam bodies have an average cell size of 0.01 to 0.3 millimeters, a density of from about 0.75 to about 6.0 pounds per cubic foot, an absolute dimensional stability of less than 4 percent in any direction when measured by the test designated ASTM D2126/C578, and preferably a minimum cross-sectional dimension of at least 0.25 inch, a cross-sectional area of at least 8 square inches, a water vapor permeability not greater than 1.8 per inch.A cell size enlarger agent may be necessary for cell sizes in the 0.2-0.3 range.
    Type: Grant
    Filed: November 8, 1989
    Date of Patent: April 30, 1991
    Assignee: The Dow Chemical Company
    Inventor: Kyung W. Suh
  • Epoxy resin compositions based on alkoxylated phenols
    Patent number: 5011904
    Abstract: Epoxy-containing compounds are prepared by dehydrohalogenating the reaction product of an epihalohydrin with the reaction product of a compound containing an average of more than one aromatic hydroxyl group per molecule with an alkylene oxide wherein the ratio of moles of epihalohydrin to hydroxyl groups is at least about 1.2:1. When these epoxy containing compounds are formulated into coatings, the resultant products have improved chemical resistance to acids.
    Type: Grant
    Filed: November 20, 1989
    Date of Patent: April 30, 1991
    Assignee: The Dow Chemical Company
    Inventors: Michael B. Cavitt, Dennis L. Steele, David J. Duncan
  • Internal mold release compositions
    Patent number: 5011647
    Abstract: Active hydrogen-containing compositions having internal mold release components are used in a process in preparing molded polymeric products. In the process, the active hydrogen-containing composition contains (a) a primary or secondary amine, (b) a carboxylic acid or amido carboxylic acid salt of a group II metal or of aluminum, lithium, copper, iron, cobalt or nickel, and optionally (c) a carboxylic acid or amido carboxylic acid.
    Type: Grant
    Filed: June 21, 1989
    Date of Patent: April 30, 1991
    Assignee: The Dow Chemical Company
    Inventors: Louis W. Meyer, Robert Carswell, J. Alan Vanderhider
  • Preparing cellulose ester membranes for gas separation
    Patent number: 5011637
    Abstract: This invention relates to a novel composition useful for preparing a semi-permeable cellulose ester gas separation membrane, which composition includes a mixture of a cellulose ester, a solvent selected from the group consisting essentially of glycerol acetate, glycerol diacetate, glycerol triacetate, and mixtures thereof, and optionally the non-solvent glycerol. This invention also relates to a process of fabricating a cellulose ester gas separation membrane from said composition.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: April 30, 1991
    Assignee: The Dow Chemical Company
    Inventors: Dana C. Overman, III, Jee I. Kau, Robert D. Mahoney