Patents Assigned to The Dow Chemical Company
  • Method for removing paint from a substrate
    Patent number: 4200671
    Abstract: Hydrophobic materials deposited on the surface of a substrate having a primer release coating of a water-insoluble, water-swellable polymer can easily be removed from the substrate upon exposure of the water-swellable polymer to an aqueous liquid. For example, paint applied to the surface of a steel panel precoated with a lightly cross-linked polyacrylate can easily be removed upon the immersion of the panel in water.
    Type: Grant
    Filed: May 5, 1978
    Date of Patent: April 29, 1980
    Assignee: The Dow Chemical Company
    Inventors: Richard M. Krajewski, Robert E. Erickson
  • Coated nutrients and medicaments for veterinary use
    Patent number: 4199561
    Abstract: An imidazoline modified styrene-acrylonitrile polymer composition which is substantially insoluble in aqueous media at about pH 6 or more but swellable or soluble at pH 3 or less is employed as a coating for nutrient or therapeutic substances for administration to ruminants. The substances thus are rendered resistant to attack and breakdown in the rumen yet remain susceptible to release and digestion within the abomasum or small intestine of the animal.
    Type: Grant
    Filed: February 26, 1979
    Date of Patent: April 22, 1980
    Assignee: The Dow Chemical Company
    Inventors: Harold H. Roth, Peter W. Owen, Thomas T. Chiu
  • Rendering porous structures impermeable by treatment with pH insensitive gelable compositions of amide polymers
    Patent number: 4199625
    Abstract: Aqueous solutions of amide polymers, such as polyacrylamide when treated with small amounts of a water-soluble polyaldehyde and a hypohalite salt at an alkaline pH, react to form firm gels within a short time at ambient temperature. Such gels, which are stable under alkaline as well as acidic conditions, are usefully employed to plug porous subterranean formations, for grouting of leaking soil pipes or wells, and to otherwise render porous structures impermeable to the passage of liquids such as water.
    Type: Grant
    Filed: June 2, 1978
    Date of Patent: April 22, 1980
    Assignee: The Dow Chemical Company
    Inventors: Richard J. Pilny, Thomas W. Regulski
  • Bonded organo-pellicular packings for chromatographic columns
    Patent number: 4199330
    Abstract: Highly effective chromatographic column packings are prepared by reacting hydroxyl groups on a silica surface with SiCl.sub.4 and then reacting the chlorosilylated surface with a polyglycol or polymeric glycol ester in a slurry reaction. Residual chlorosilane groups on the reacted surface are neutralized by reaction with methanol or other lower alkanol. The resulting modified silica has a bonded, essentially monomolecular organic surface film which provides thermal stability, uniform efficiency, and rapid analysis when the material is used as a column packing in gas-liquid chromatography.
    Type: Grant
    Filed: January 22, 1979
    Date of Patent: April 22, 1980
    Assignee: The Dow Chemical Company
    Inventors: Terry J. Nestrick, Rudolph H. Stehl
  • Method of making curved laminated panels
    Patent number: 4199389
    Abstract: Curved laminated sandwich panels having a plastic foam core and surface skins are prepared by applying pressure sensitive adhesive to at least one of adjacent faces to be joined, interposing a slip sheet between adjacent surfaces of the sheets to be laminated, positioning the sheets to be laminated within a matched die mold, removing the slip sheets and passing the matched die mold through pressure rolls to deform the sheets and conform them to the shape of the mold.
    Type: Grant
    Filed: May 26, 1976
    Date of Patent: April 22, 1980
    Assignee: The Dow Chemical Company
    Inventors: Albert J. Palfey, William P. Hovey
  • 1,4-Dithiino pyrazine tetracarbonitriles
    Patent number: 4199581
    Abstract: Novel 1,4-Dithiinopyrazinetetracarbonitriles are disclosed. Their method of use in the control and kill of bacteria and fungi, and compositions containing the novel compounds as the active ingredients therein are claimed.
    Type: Grant
    Filed: September 22, 1978
    Date of Patent: April 22, 1980
    Assignee: The Dow Chemical Company
    Inventors: Craig E. Mixan, R. Garth Pews
  • Analytical technique for quantitating acid/salt and base/salt samples for species concentration
    Patent number: 4199323
    Abstract: Acid or alternately base species concentration in aqueous and non-aqueous samples is quantitated, in the presence of interfering ionic salts, using most preferably differential conductivity detection combined with ion-exchange derivatization, wherein characteristically the acid or base species is derivatized to water, and blended indistinguishably in a required aqueous carrier phase, and the interfering salt(s) is derivatized to a distinguishable hydroxide or acid derivative(s). Using the preferred mode of detector read-out, the calibrated peak of the conductimetric response of the salt derivative(s) is compared to the peak of the conductimetric response of the sample and the response differential is displayed and used to predict the acid or base species concentration. The salt(s) concentration (with some exceptions) may be simultaneously predicted since it is proportional to the first mentioned peak.
    Type: Grant
    Filed: June 8, 1978
    Date of Patent: April 22, 1980
    Assignee: The Dow Chemical Company
    Inventors: Theodore E. Miller, Jr., Timothy S. Stevens
  • Vermicular expanded graphite composite material
    Patent number: 4199628
    Abstract: The present invention relates to a vermicular expanded graphite composite material and to an improved method for preparing such material by blending vermicular expanded graphite with a corrosion resistant resin dispersed in a carrier, vaporizing the carrier, and heating the composite material to sinter the resin. Compressed forms of the composite material are useful for protecting corrosion vulnerable substrates.
    Type: Grant
    Filed: March 23, 1978
    Date of Patent: April 22, 1980
    Assignee: The Dow Chemical Company
    Inventor: Ronald S. Caines
  • Process for producing olefins from carbon monoxide and hydrogen
    Patent number: 4199522
    Abstract: Olefins of two to four carbon atoms are prepared by an improved Fischer-Tropsch process, the improvement comprising the use of a catalyst having a surface area less than about 100 m.sup.2 /g and consisting essentially of:(1) at least one material selected from the group consisting of the sulfide, oxide or metal of Mo, W, Re, Ru, Ni, Pd, Rh, Os, Ir and Pt;(2) at least one material selected from the group consisting of the hydroxide, oxicde or salt of Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba and Th; and(3) optionally, a support.
    Type: Grant
    Filed: September 20, 1978
    Date of Patent: April 22, 1980
    Assignee: The Dow Chemical Company
    Inventors: Craig B. Murchison, Dewey A. Murdick
  • Quaternary ammonium salts of epihalohydrin polymers as additives for fibrous cellulosic materials
    Patent number: 4198269
    Abstract: Properties of fibrous materials, e.g., wet and dry strength of paper, are significantly improved by incorporating a cationic polyether into a fibrous material such as pulp. The polyether bears ammonium salt groups exemplified by the formula: ##STR1## wherein R.sub.1 and R.sub.2 are individually hydrogen, hydrocarbyl such as alkyl, hydroxyhydrocarbyl, or hydrocarbylamino; E is individually ##STR2## or E and R.sub.1 are collectively ##STR3## wherein R is hydrogen or alkyl, R.sub.3 is hydroxyl, halogen, hydrogen or hydrocarbyl, R.sub.4 is hydrogen or hydrocarbyl; and A.sup..crclbar. is an anion of an ammonium salt. Such polyethers also function as retention aids for sizing agents and dyes and as antistatic agents.
    Type: Grant
    Filed: March 9, 1979
    Date of Patent: April 15, 1980
    Assignee: The Dow Chemical Company
    Inventors: Syamalarao Evani, George R. Killat
  • High efficiency catalyst for polymerizing olefins
    Patent number: 4198315
    Abstract: Compositions exhibiting high catalytic activity in the polymerization of .alpha.-olefins, particularly higher olefins, are prepared by reacting tetravalent or trivalent titanium compounds such as a titanium tetralkoxide, an anhydrous nickel compound such as nickel chloride, an organomagnesium component such as a hydrocarbon soluble complex of dialkyl magnesium and an alkyl aluminum and a halide source such as a hydrogen halide or an alkyl aluminum halide. Polymerization processes employing this catalyst composition do not require conventional catalyst removal steps in order to provide polymers having suitable color and other physical characteristics and these catalysts produce polymers having broader molecular weight distributions than do corresponding catalysts without the anhydrous nickel compound.
    Type: Grant
    Filed: September 5, 1978
    Date of Patent: April 15, 1980
    Assignee: The Dow Chemical Company
    Inventors: Donald F. Birkelbach, George W. Knight
  • Porous manganese electrode(s)
    Patent number: 4197367
    Abstract: A catalytically-active electrode, especially well suited for the electroreduction of oxygen in alkaline media, is comprised at least partially of a substantial proportion of finely comminutated, particulate metallic manganese fabricated in a porous body form of structure so as to retain its essential elemental integrity or character.
    Type: Grant
    Filed: September 5, 1978
    Date of Patent: April 8, 1980
    Assignee: The Dow Chemical Company
    Inventor: Gary A. Deborski
  • Amine-resin supported rhodium-cobalt bimetallic clusters as novel hydroformylation catalysts
    Patent number: 4197414
    Abstract: Olefins are converted to alcohols by a one-step, hydroformylation process comprising contacting an olefin, such as 1-hexene, with a gaseous mixture of carbon monoxide and hydrogen in the presence of a catalyst prepared by loading a bimetallic cluster of the formula: Rh.sub.x Co.sub.y CO.sub.12 wherein both x and y are independently integers 1-3 with the proviso that .SIGMA.(x+y)=4, onto an amine resin, such as Dowex.RTM. MWA-1.
    Type: Grant
    Filed: October 18, 1978
    Date of Patent: April 8, 1980
    Assignee: The Dow Chemical Company
    Inventors: George E. Hartwell, Philip E. Garrou
  • Electrolyte series flow in electrolytic chlor-alkali cells
    Patent number: 4197179
    Abstract: In an electrolytic chlor-alkali cell, or bank of cells, having a plurality of electrolyte compartments containing electrode pairs (anodes and cathodes) and wherein a hydraulically-impermeable membrane separates the electrolyte compartments into catholyte portions and anolyte portions, said cell or cells being employed to produce chlorine at the anodes and caustic and hydrogen at the cathodes by the electrolysis of an aqueous alkali metal chloride electrolyte, improved operation is attained by flowing anolyte liquor from anolyte portion to anolyte portion, sequentially, while simultaneously, and in the opposite direction, flowing catholyte liquor from catholyte portion to catholyte portion, sequentially. The membrane substantially prevents Cl.sup.- from entering the catholyte liquor from the anolyte, and a high purity caustic, substantially free of salt, is produced.
    Type: Grant
    Filed: July 13, 1978
    Date of Patent: April 8, 1980
    Assignee: The Dow Chemical Company
    Inventors: Bobby R. Ezzell, Marius W. Sorenson
  • Preparation of organic halides
    Patent number: 4197262
    Abstract: Organic halides containing at least one halogen-replaceable bromine atom are reacted with chlorine in the presence of a catalyst selected from the group consisting of the halides of antimony, tin, zinc, or vanadium to form a corresponding organic halide having at least the one bromine atom replaced by a chlorine atom.
    Type: Grant
    Filed: November 3, 1978
    Date of Patent: April 8, 1980
    Assignee: The Dow Chemical Company
    Inventor: Ralph A. Davis
  • Polyfunctional lithium containing initiator
    Patent number: 4196153
    Abstract: Very desirable polyfunctional lithium containing polymerization initiators are prepared by reacting an adduct of an organo lithium compound and styrene with an organic compound containing at least two 1,1-diphenylethylene groups in the proportion of about two moles of the adduct to one mole of the organic compound. A difunctional lithium initiator is prepared thereby. The difunctional initiator may be reacted with styrene and subsequently an additional quantity of the diphenylethylene compound which in turn is reacted with the styrene-organo lithium adduct to form a trifunctional initiator. The process can be repeated to obtain an initiator having any desired degree of lithium functionality. Such initiators can be prepared in the absence of polar solvents and are very desirable for the polymerization of dienes such as butadiene to a desirable 1,4 configuration and preparation of block copolymers.
    Type: Grant
    Filed: August 7, 1978
    Date of Patent: April 1, 1980
    Assignee: The Dow Chemical Company
    Inventors: Lu H. Tung, Grace Y-S Lo
  • Substituted phenoxyalkyl quaternary ammonium compounds
    Patent number: 4196143
    Abstract: Quaternary ammonium compounds such as [2-(4-amino-2,6-dibromophenoxy)ethyl]dimethyl (allyl) ammonium bromide are prepared by the reaction of a tertiary amine such as 3,5-dibromo-.beta.-dimethylamino-p-phenetidine with a substituted organic compound such as allyl bromide. The quaternary ammonium compounds are useful in alleviating or inhibiting cardiac arrhythmias when the quaternary ammonium compounds, or compositions comprising the same are administered to animals.
    Type: Grant
    Filed: October 11, 1977
    Date of Patent: April 1, 1980
    Assignee: The Dow Chemical Company
    Inventor: Stanley J. Strycker
  • O,O-bis(substituted pyridinyl)phosphonates and phosphonothioates
    Patent number: 4196293
    Abstract: O,O-bis-(pyridinyl)phosphonates and phosphonothioates corresponding to the formula: ##STR1## wherein X represents hydrogen, chloro, bromo, fluoro, trifluoromethyl or methyl; n represents an integer of from 1 to 3; Y represents oxygen or sulfur; and Z represents alkyl of 2 to 3 carbon atoms, haloalkyl of 1 to 2 carbon atoms with halo being chloro, fluoro or bromo, ethenyl, phenyl, phenylmethyl or cyclohexyl are prepared. These compounds have been found to have utility as insecticides.
    Type: Grant
    Filed: December 1, 1978
    Date of Patent: April 1, 1980
    Assignee: The Dow Chemical Company
    Inventor: Chester E. Pawloski
  • Cyclic sulfonium ylids
    Patent number: 4196298
    Abstract: Novel cyclic sulfonium ylids corresponding to the formula ##STR1## wherein R is a hydrocarbylene radical (or a hydrocarbylene radical whose chain length is interrupted by an atom of oxygen or sulfur) of from 2 to about 20 carbon atoms, are useful as cross-linking agents for carboxyl-containing polymers. The compounds are conveniently prepared by reacting phenacyltetrahydrothiophenium bromide with the corresponding hydrocarbylene diisocyanate in the presence of a strong base (e.g. sodium hydride) and anhydrous tetrahydrofuran.
    Type: Grant
    Filed: November 6, 1978
    Date of Patent: April 1, 1980
    Assignee: The Dow Chemical Company
    Inventors: Thomas C. Klingler, Donald L. Schmidt
  • Combustion of halogenated hydrocarbons
    Patent number: 4195596
    Abstract: Halogenated hydrocarbon materials are burned in an internally-fired horizontal fire-tube boiler and the heat of combustion directly produces saturated steam. Halogen values may be recovered from the combustion gases, e.g., by being absorbed in water. Thus halogenated hydrocarbon material which may need to be disposed of, is beneficially converted to energy and useful product.
    Type: Grant
    Filed: September 11, 1978
    Date of Patent: April 1, 1980
    Assignee: The Dow Chemical Company
    Inventors: John C. Scheifley, Clark R. Shields, David E. Busby