Patents Assigned to Dow Chemical Company
  • Form, fill and seal machine with hot gas and thermal impulse sealing
    Patent number: 4512138
    Abstract: A form, fill and seal machine packages products in a thermoplastic material which is formed into a tube and sealed with a measured amount of the product within. The transverse seals in the tube are formed in a cyclic operation by a pair of cooperating sealing heads. The heads clamp the tube walls together above and below a line of severance between two sequentially formed packages and weld the tube walls together along transverse sealing areas at each side of the line of severance. To heat the material to a fusing temperature, the one sealing head has a chamber from which hot gas is directed onto one side of a sealing area, and the other sealing head has an electrical heater for applying a thermal impulse of heat to the other side of the sealing area. The hot gas presses the thermoplastic material against the electrical heater and provides a "free form" clamp for uniform sealing pressure.
    Type: Grant
    Filed: March 4, 1982
    Date of Patent: April 23, 1985
    Assignee: The Dow Chemical Company
    Inventor: Eddie L. Greenawalt
  • Preparation of a copolymer polyahl using an addition polymerizable adduct of a polymeric monoahl and an ethylenically unsaturated coreactant
    Patent number: 4513124
    Abstract: An adduct of a monoahl, e.g., a monohydroxyl polyalkylene oxide, and an active ethylenically unsaturated coreactant monomer, methacryloyl chloride, is usefully employed in the preparation of stable copolymer dispersions of the type used in the production of polyurethane foams and polyurethane elastomers.The copolymer dispersion is prepared by addition copolymerization of (1) the adduct with (2) ethylenically unsaturated monomers(s), e.g., styrene or mixture thereof with acrylonitrile, while (1) and (2) are dispersed or dissolved in an excess of an active hydrogen polyfunctional compound.
    Type: Grant
    Filed: February 14, 1983
    Date of Patent: April 23, 1985
    Assignee: The Dow Chemical Company
    Inventor: Dwight K. Hoffman
  • 1,3-Oxathiolane-2-thiones as sulfide mineral collectors in froth flotation
    Patent number: 4511464
    Abstract: The invention is a process of concentrating sulfide ores, which comprises subjecting a sulfide ore, in the form of a pulp, to a flotation process in the presence of a flotation collector for the sulfides comprising a 1,3-oxathiolane-2-thione or a 1,3-dithiolane-2-thione.
    Type: Grant
    Filed: July 22, 1983
    Date of Patent: April 16, 1985
    Assignee: The Dow Chemical Company
    Inventor: Roger W. Bergman
  • Halide removal from fluid organic materials
    Patent number: 4511710
    Abstract: Unwanted halogen values are removed from liquid resin, organic or hydrocarbon material by adding particulate crystalline lithium aluminate compounds to the liquid material to act as a halogen scavenger, then separating the crystalline aluminate compound from the liquid material.
    Type: Grant
    Filed: June 11, 1984
    Date of Patent: April 16, 1985
    Assignee: The Dow Chemical Company
    Inventors: Chun S. Wang, Kyle B. Benkendorfer, John L. Burba, III
  • Flame retardant for use in rigid polyurethane foams
    Patent number: 4511688
    Abstract: Novel flame retardant compositions, which are useful in the preparation of rigid polyurethane foams, comprise a sucrose polyol, an aromatic polyester polyol, and a brominated, hydroxyl-containing pentaerythritol.
    Type: Grant
    Filed: February 29, 1984
    Date of Patent: April 16, 1985
    Assignee: The Dow Chemical Company
    Inventors: Enrico J. Termine, Sally P. Ginter
  • Process of using water-absorbent agents for low pH applications
    Patent number: 4511477
    Abstract: A process for absorbing water containing relatively large amount of acid comprises contacting an aqueous medium with a rapidly water-swellable polymer comprising an alkali metal sulfonic acid salt containing polyelectrolyte. For example, a crosslinked polymer containing polymerized acrylamide and sodium 2-acrylamide-2-methylpropane sulfonate can be used to remove acidic water from fuels, battery casings, etc.
    Type: Grant
    Filed: October 17, 1983
    Date of Patent: April 16, 1985
    Assignee: The Dow Chemical Company
    Inventors: Mark J. McKinley, Jim W. Sanner
  • 2-Ethoxyethyl 2-(4-hydroxyphenoxy)-propanoate
    Patent number: 4511731
    Abstract: Preparation of monoethers of dihydroxybenzenes from an isopropenylphenol and an alkylating agent and thereafter oxidizing in the presence of an acid catalyst.
    Type: Grant
    Filed: June 24, 1983
    Date of Patent: April 16, 1985
    Assignee: The Dow Chemical Company
    Inventors: Abel Mendoza, Eric W. Otterbacher
  • Method of operating a liquid-gas electrochemical cell
    Patent number: 4511441
    Abstract: The invention includes in its scope a method for electrochemically reacting a liquid with a gas in an electrochemical cell of the type having at least two electrodes separated by a liquid permeable separator. At least one of said electrodes is in physical contact with the separator and is porous and self-draining. A gas is flowed into at least a portion of the pores of the self-draining electrode and a liquid is controllably flowed through the separator and into the self-draining electrode at a rate about equal to the drainage rate of the electrode and in a quantity sufficient to fill only a portion of the electrode pores. The liquid and the gas are electrochemically reacted to form at least one nonvolatile product. Thereafter, the products of the electrochemical reaction are removed from said self-draining electrode.
    Type: Grant
    Filed: August 24, 1983
    Date of Patent: April 16, 1985
    Assignee: The Dow Chemical Company
    Inventors: James A. McIntyre, Robert F. Phillips
  • Addition of additives to plastics
    Patent number: 4511603
    Abstract: Additives are sprayed onto synthetic resinous thermoplastic particles by applying a spray nozzle at an elbow spraying radially outwardly.
    Type: Grant
    Filed: December 19, 1983
    Date of Patent: April 16, 1985
    Assignee: The Dow Chemical Company
    Inventor: Leslie E. Wallace
  • High temperature battery cell comprising stress-free hollow fiber bundle
    Patent number: 4510681
    Abstract: Thermal stressing of hollow fibers constituting the electrolyte-separator in a high temperature battery cell, and of certain other elements thereof, is avoided by suspending the assembly comprising the anolyte tank, the tubesheet, the hollow fibers and a cathodic current collector-distributor within the casing and employing a limp connection between the collector-distributor and the cathode terminal of the cell.
    Type: Grant
    Filed: January 11, 1982
    Date of Patent: April 16, 1985
    Assignee: The Dow Chemical Company
    Inventors: Joginder N. Anand, Timothy T. Revak, Frank J. Rossini
  • Fracturing fluids containing bouyant inorganic diverting agent and method of use in hydraulic fracturing of subterranean formations
    Patent number: 4509598
    Abstract: The growth of upward vertical fractures during a hydraulic fracturing process is inhibited or prevented by (1) initiating the fracture with a first fluid which is a pad fluid, and (2) extending the fracture with a second fluid comprising a carrier fluid and a bouyant inorganic diverting agent. The second fluid is preferably pumped at a minimum rate to extend the fracture and carry the diverting agent without screening out. After the diverting agent is implaced, a viscous pad fluid and fracture fluid are subsequently pumped at treatment rates and pressures to complete the fracturing process.
    Type: Grant
    Filed: March 25, 1983
    Date of Patent: April 9, 1985
    Assignee: The Dow Chemical Company
    Inventors: Robert B. Earl, David B. Larson, Huy X. Nguyen
  • Method for molybdenum-coated aluminum current collector for alkali metal/sulfur battery cells
    Patent number: 4509254
    Abstract: Alkali metal/sulfur battery cells, in which the cathodic current collector is a shaped article comprising an aluminum substrate coated with molybdenum, have longer service lives if the molybdenum is overcoated with a layer of molybdenum oxides comprising an outer portion consisting of MoO.sub.3.
    Type: Grant
    Filed: March 5, 1984
    Date of Patent: April 9, 1985
    Assignee: The Dow Chemical Company
    Inventors: Paul A. Damrow, Floris Y. Tsang
  • Method of forming blanks for the solid-phase forming of thermoplastic articles
    Patent number: 4510108
    Abstract: An improved, essentially scrap-free, solid-phase process for making thermoplastic articles directly from resinous powder. The process can be particularly advantageous to forming large parts from thermoplastic resinous powders. The method essentially comprises taking resinous powder, briquetting the powder, sintering the briquette, repressing the powder in a warm state and then shaping the briquette into a preform or a blank which can then be thermoformed into a resulting container or other product, assuming the blank itself is not the desired end product. Alternatively, sintering can take place after repressing with preheating of the briquette prior to the repressing step.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: April 9, 1985
    Assignee: The Dow Chemical Company
    Inventors: Kenneth J. Cleereman, O. Carl Raspor, Alan F. Burmester
  • Halogenated phosphorus hydroxy-alkyl and t-alkoxyalkyl esters
    Patent number: 4510101
    Abstract: The invention is phosphorus compounds containing .alpha.-halo hydroxyalkyl or .alpha.-halo t-alkoxyalkyl groups corresponding to the formula ##STR1## wherein R independently in each occurrence is alkylene, haloalkylene, alkenylene, haloalkenylene, phenylene, diphenylene, halophenylene, dihalophenylene, and oxyalkylene;R.sup.1 independently in each occurrence is hydrogen, CH.sub.2 OR.sup.3, CH.sub.2 OH, haloalkyl, phenyl, halophenyl or methyl phenoxy;R.sup.2 independently in each occurrence is haloalkyl, phenyl, haloaryl or alkyl;R.sup.3 independently in each occurrence is t-alkyl;X independently in each occurrence is bromine or chlorine;a is independently in each occurrence 1 or 2; andb is independently in each occurrence 0 or 1,with the proviso that at least one R.sup.1 is CH.sub.2 OR.sup.3 or CH.sub.2 OH.
    Type: Grant
    Filed: March 18, 1983
    Date of Patent: April 9, 1985
    Assignee: The Dow Chemical Company
    Inventors: Chester E. Pawloski, Sally P. Ginter
  • Duplex metal alloy/polymer compositions
    Patent number: 4510208
    Abstract: A multilayer metal/organic polymer composite which has a formable thermoplastic polymer layer, a first metal layer adhered to the polymer layer and a second metal layer adhered to the first metal layer. The first metal layer is formed either from one metal or from an alloy of two or more metals. Suitable alloys are those which begin melting at a temperature within a range of from about 85 to 150 percent of the forming temperatures in degrees Kelvin of the polymer layer. If the first meal layer is formed from one metal, the metal is suitably, copper, silver, nickel or manganese. The second metal layer is a metal or an alloy of two or more metals that melts at a temperature which is less than that at which the first metal layer melts.
    Type: Grant
    Filed: July 1, 1983
    Date of Patent: April 9, 1985
    Assignee: The Dow Chemical Company
    Inventor: Virgil B. Kurfman
  • Directional flexibilization of expanded thermoplastic foam sheet for low temperature insulation
    Patent number: 4510268
    Abstract: Flexibilized, rigid plastic foam sheets with improved properties particularly desirable for low temperature and cryogenic insulation can be prepared by mechanical compression of freshly expanded closed-cell thermoplastic foams. Thus an extruded foam sheet having a density of 20-100 kg/m.sup.3, a y-axial size size of 0.05 to 1.00 mm and a Y-axial compressive strength of at least 1.8 kg/cm.sup.2 is flexibilized with 0.25 to 240 hours of expansion to give a flexibilized foam with improved elongation, workability, crack resistance and water vapor barrier properties.
    Type: Grant
    Filed: April 9, 1982
    Date of Patent: April 9, 1985
    Assignee: The Dow Chemical Company
    Inventors: Hiroshi Tonokawa, Masao Nakamura
  • Radioactive metals complexed with phosphonate derivatives of bicycloheptane bis(alkylamines)
    Patent number: 4508704
    Abstract: New stable complexing agents for Tc-99m which are phosphonate derivatives of bicycloheptane bis(alkylamines) have been found which are useful in imaging the skeletal system in animals. The complexes readily clear through the kidneys with large amounts being taken up in the bone. The ratio of uptake in bone to that in soft tissue is high.
    Type: Grant
    Filed: February 27, 1984
    Date of Patent: April 2, 1985
    Assignee: The Dow Chemical Company
    Inventors: Jaime Simon, David A. Wilson, Wynn A. Volkert
  • Recovery of fumed SiO.sub.2
    Patent number: 4508538
    Abstract: A method of recovering fumed hydrophobic SiO.sub.2, produced by the flame hydrolysis of a ternary azeotrope of H.sub.2 SiF.sub.6, HF, and H.sub.2 O, is disclosed. The method involves passing the fumed hydrophobic silica, as it leaves the combustion chamber, through a nonclassifying agglomerator at a residence (travel) time of from about 0.5 to several seconds, preferably about 1.0 to about 5.0 seconds, then separating the fumed silica from the product stream in a cyclone separator or other means for collecting dispersoids.
    Type: Grant
    Filed: December 4, 1980
    Date of Patent: April 2, 1985
    Assignee: The Dow Chemical Company
    Inventors: Joel F. M. Leathers, Donald W. Calvin
  • Latexes of polymers having pendant coreactive and oxazoline groups
    Patent number: 4508869
    Abstract: Latexes containing particles having pendant coreactive groups and oxazoline groups are disclosed. Said latexes are self-curing yielding films and other articles having excellent tensile strength and resistance to water and other solvents. In addition, a process for making such latexes is disclosed.
    Type: Grant
    Filed: June 14, 1983
    Date of Patent: April 2, 1985
    Assignee: The Dow Chemical Company
    Inventors: William H. Keskey, James E. Schuetz, Do I. Lee
  • Transparent blends of polymethylmethacrylate and certain styrene copolymers
    Patent number: 4508871
    Abstract: Innately-transparent, polymethylmethacrylate polyblends, and transparent shaped articles therefrom fabricated, are comprised with components therein of:(a) polymethylmethacrylate; and(b) at least one copolymer of styrene (and/or equivalent vinyl aromatic monomers) with one or more of certain vinyl acids; plus and optionally or as an alternative;(c) at least one mass-made acrylonitrile-butadiene-styrene or acrylonitrile-butadiene-styrene-type resin in addition to or in replacement of and substitution for said component (b).
    Type: Grant
    Filed: February 28, 1983
    Date of Patent: April 2, 1985
    Assignee: The Dow Chemical Company
    Inventors: Henno Keskkula, Kathleen M. McCreedy, Donald A. Maass