Patents Assigned to Dow Chemical Company
  • Method and apparatus for the extrusion of synthetic resinous thermoplastics
    Patent number: 4623502
    Abstract: In an extrusion process a feed conduit for the die is positioned axially in the extruder barrel to provide minimal surface roughness on the extrudate. Increased extrusion rates of quality product are obtained.
    Type: Grant
    Filed: March 15, 1985
    Date of Patent: November 18, 1986
    Assignee: The Dow Chemical Company
    Inventor: Arie Cohen
  • Process for preparing uniformly sized polymer particles by suspension polymerization of vibratorily excited monomers in a gaseous or liquid stream
    Patent number: 4623706
    Abstract: Spheroidal polymer beads having a uniform size are prepared by polymerizing uniformly sized monomer droplets formed by vibratory excitation of a laminar jet of monomeric material flowing in a gas phase. For example, a laminar jet of a monomer mixture comprising styrene, divinylbenzene and a polymerization initiator can be subjected to vibratory excitation and the resulting monomer droplets polymerized to yield copolymer beads having a narrow particle size range distribution. The copolymer beads can be employed in applications where beads having diameters of 5 .mu.m to 100 .mu.m are useful.
    Type: Grant
    Filed: August 23, 1984
    Date of Patent: November 18, 1986
    Assignee: The Dow Chemical Company
    Inventors: Edward E. Timm, Douglas E. Leng
  • Polymerization of olefins in the presence of polymer supported Ziegler-Natta catalysts
    Patent number: 4623707
    Abstract: .alpha.-Olefins are polymerized in the presence of Ziegler-Natta catalysts which are polymer supported compounds or complexes of elements of the d-block transition metals, lanthanide or actinide series. An example of the polymer support is chloromethylated polystyrene-divinyl benzene copolymer covalently bonded to catechol. An example of the compound or complex of an element of the transition metal, lanthanide or actinide series is that which results when catechol which is covalently bonded to the polymer is contacted with titanium tetraisopropoxide.
    Type: Grant
    Filed: December 10, 1985
    Date of Patent: November 18, 1986
    Assignee: The Dow Chemical Company
    Inventors: Stephen A. Bedell, William M. Coleman, III, William R. Howell, Jr.
  • Apparatus for distributing material flow
    Patent number: 4623056
    Abstract: An apparatus for distributing material flow having a distribution chamber defined by an upper receiving section and a lower discharge section integral therewith. The lower section is defined by a plurality of fixed downspouts arranged in a circle and communicating with each other at a portion of their upper end to form a cone with a common apex extending slightly into the receiving section at the central axis. A rotatable chute is positioned axially within the chamber to selectively distribute material flow to any one of the fixed downspouts.
    Type: Grant
    Filed: March 14, 1986
    Date of Patent: November 18, 1986
    Assignee: The Dow Chemical Company
    Inventor: Ronald R. Flaugher
  • Multifunctional epoxy resins
    Patent number: 4623701
    Abstract: Multifunctional epoxy resins are prepared by reacting (1) a polyglycidyl ether of a polyhydroxyl-containing material said glycidyl ether having an average of at least 0.
    Type: Grant
    Filed: July 10, 1985
    Date of Patent: November 18, 1986
    Assignee: The Dow Chemical Company
    Inventor: John L. Massingill
  • Foams of ionically associated blends of styrenic and ethylenic polymers
    Patent number: 4623671
    Abstract: Novel foamed thermoplastic resins are disclosed. The foam includes an ionically associated blend containing at least about 60 weight % of a metal salt of a styrene-acrylic acid copolymer and at least 1 weight % of a metal salt of an ethylene-acrylic acid copolymer. The foams typically are prepared by extruding a ternary mixture of a styrene-acrylic acid copolymer, an ethylene-acrylic copolymer and an alkali metal bicarbonate which functions as the foaming agent. The ionically associated blends included in the foam are believed to be novel compositions of matter.
    Type: Grant
    Filed: October 29, 1985
    Date of Patent: November 18, 1986
    Assignee: The Dow Chemical Company
    Inventor: Chung P. Park
  • Urethane-modified polyisocyanurate rigid foam
    Patent number: 4623673
    Abstract: Improved crack-free rigid cellular polyisocyanurate polymers are disclosed that are derived from the reaction of an organic polyisocyanate combination comprising two particular types of polymethylene polyphenyl polyisocyanates (a) and (b), a trimerization catalyst, minor amount of a polyol, a surfactant, and an inert volatile blowing agent having a boiling point from about 30.degree. C. to about 90.degree. C.The novel rigid foams are particularly useful in preparing high molded bodies of foam by making multiple pours or lifts on top of each other in a mold. The resultant molded body comprises a multiple of molded parts firmly fused to each other and crack-free. Such high molded bodies and process therefor are particularly useful in the insulation of ships.
    Type: Grant
    Filed: October 24, 1985
    Date of Patent: November 18, 1986
    Assignee: The Dow Chemical Company
    Inventors: David T. DeGuiseppi, Gilda C. Gonzales
  • Analyzer for water in gases by accumulate-desorb-inject method
    Patent number: 4621518
    Abstract: A method and apparatus for measuring very low levels of moisture in gases and vapors including an absorption column packed with fibers to selectively absorb the moisture. Preferably, the column is loosely packed with glass fibers. The moisture is desorbed from the column with a carrier gas that is passed through a moisture analyzer, preferably a P.sub.2 O.sub.5 hygrometer.
    Type: Grant
    Filed: June 21, 1985
    Date of Patent: November 11, 1986
    Assignee: The Dow Chemical Company
    Inventor: Walter F. Gerdes
  • Electrically conducting complexes
    Patent number: 4622169
    Abstract: The invention is an electrically conducting complex comprising the reaction product of(a) an anthraquinone or naphthaquinone which is substituted with at least one primary amino group and at least one other substituent comprising a second primary amino group, a hydroxy group or a mercapto group; and(b) a salt of a Group VIII metal, Group IB metal or Group IIB metal wherein the complex has a conductivity of between about 0.0001 and 30 s/cm.
    Type: Grant
    Filed: November 1, 1984
    Date of Patent: November 11, 1986
    Assignee: The Dow Chemical Company
    Inventor: Gregory K. Rickle
  • Novel titanium complexes and catalysts prepared therefrom
    Patent number: 4622309
    Abstract: Novel titanium compounds or complexes are prepared by reacting a titanium compound such as titanium tetraisopropoxide with a compound containing at least one aliphatic hydroxyl group. These compounds and/or complexes are useful as the transition metal component in supported Ziegler-Natta catalysts.
    Type: Grant
    Filed: October 28, 1985
    Date of Patent: November 11, 1986
    Assignee: The Dow Chemical Company
    Inventors: William M. Coleman, III, Morris S. Edmondson
  • Rubber-reinforced polymeric resins containing a mineral fiber
    Patent number: 4622351
    Abstract: The physical properties of a rubber-reinforced polymer resin are enhanced by the addition of glass fibers having a diameter which is less than 20 times greater than the volume average particle size of the disperse rubber particles in the reinforced polymer resin.
    Type: Grant
    Filed: February 15, 1985
    Date of Patent: November 11, 1986
    Assignee: The Dow Chemical Company
    Inventor: Dinh P. Van
  • Heat-transfer fluid
    Patent number: 4622160
    Abstract: Wide range heat-transfer fluids can be made by mixing methyl and/or ethyl biphenyls with diethylbenzenes. The fluids can be used at temperatures down to -20.degree. F. (-29.degree. C.).
    Type: Grant
    Filed: October 23, 1985
    Date of Patent: November 11, 1986
    Assignee: The Dow Chemical Company
    Inventors: Gary R. Buske, Terry L. Wenger, John A. Beyrau
  • Brominated hydroxyaromatic compounds
    Patent number: 4621159
    Abstract: Prepare novel ring-brominated derivatives of tetraalkyl dihydroxy diaromatic compounds, e.g. 4,4'-(1,2-ethanediyl)bis(3,5-dibromo-2,6-dimethyl-phenol).
    Type: Grant
    Filed: September 9, 1985
    Date of Patent: November 4, 1986
    Assignee: The Dow Chemical Company
    Inventor: Abel Mendoza
  • Repeating block, oligomer-free, polyphase, thermoformable polyurethanes and method of preparation thereof
    Patent number: 4621113
    Abstract: Polyphase, transparent, polyblock, oligomer-free, segmented urethane polymers having molecular weights of from about 100,000 to about 200,000 and being eminently suited for use in medical devices such as blood bags, etc., are deriveable from chain extenders, free diisocyanate molecules and prepolymers consisting essentially of linear molecules which are terminated at each end by isocyanate groups. The prepolymer molecules consist of n branched, polyether glycol residues joined through intervening carbamate groups with (n+1) diisocyanate residues, n ranging from about 1 to 4 and having an average value of less than 2. The polyether glycols have molecular weights of from about 1000 to about 6000 and are methylol-terminated chains of C.sub.3 -C.sub.6 alkylene oxide units. Importantly, the final polymers are free of domain crystallinity.
    Type: Grant
    Filed: October 7, 1985
    Date of Patent: November 4, 1986
    Assignee: The Dow Chemical Company
    Inventor: Guy R. Collins
  • Zinc-based paints employing a mixture of ether alcohols as liquid organic vehicle
    Patent number: 4620873
    Abstract: A solvent mix can be used to improve the protection offered by zinc-based paints. This method of improving zinc-based paints' protection affords an additional factor for the enhancement of coating protection.
    Type: Grant
    Filed: September 23, 1985
    Date of Patent: November 4, 1986
    Assignee: The Dow Chemical Company
    Inventor: Edward W. Orr
  • Low styrene emission vinyl ester resin employing polyacrylates for fiber-reinforced applications
    Patent number: 4619953
    Abstract: Low styrene emission vinyl ester resin compositions containing a polyacrylate as an adhesion promoter. Said VER composition exhibits desirable physical properties such as low styrene emission and excellent adhesive bond strength.
    Type: Grant
    Filed: September 9, 1985
    Date of Patent: October 28, 1986
    Assignee: The Dow Chemical Company
    Inventors: John A. Schols, Kee C. Yu
  • Monomeric plasticizers for halogen-containing resins
    Patent number: 4620026
    Abstract: A composition having utility as a plasticizer for halogen-containing resins is a mixture of (a) at least two diesters of terephthalic acid or (b) at least two triesters of trimellitic acid. The diesters of terephthalic acid are represented by the general formula ##STR1## wherein R.sub.1 is a phenyl radical or an aliphatic hydrocarbon radical of the formula C.sub.n H.sub.m, wherein n is an integer of 1 through 8 inclusive and m is equal to 2n+1; R.sub.2 is either hydrogen or an aliphatic hydrocarbon having one, two, three or four carbon atoms; x is an integer of 2 to 4 inclusive; y is an integer of 2 to 4 inclusive;The trialkyl esters of trimellitic acid are represented by the general formula ##STR2## wherein R.sub.1 is a phenyl radical or an aliphatic hydrocarbon radical of the formula C.sub.n H.sub.m wherein n is an integer of 1 through 8 inclusive and m is equal to 2n+1; R.sub.
    Type: Grant
    Filed: August 10, 1984
    Date of Patent: October 28, 1986
    Assignee: The Dow Chemical Company
    Inventor: Sanford A. Siegel
  • Eneynols from acetylenes and propargylic alcohols
    Patent number: 4620045
    Abstract: Eneynols are prepared from terminal acetylenes and propargylic alcohols using a Cu.sup.+, Ag.sup.+ and/or Au.sup.+ halide catalyst.
    Type: Grant
    Filed: March 19, 1985
    Date of Patent: October 28, 1986
    Assignee: The Dow Chemical Company
    Inventors: Giffin D. Jones, Harold E. Doorenbos
  • Production of phenols and catalyst therefor
    Patent number: 4620043
    Abstract: Multicomponent catalysts comprising copper, a metal selected from the group consisting of vanadium, chromium, manganese, iron, cobalt, nickel and zinc; and phosphate are employed for oxidizing an aromatic carboxylic acid to the corresponding phenol, e.g., benzoic acid to phenol.
    Type: Grant
    Filed: October 17, 1985
    Date of Patent: October 28, 1986
    Assignee: The Dow Chemical Company
    Inventors: Chiu T. Lam, David M. Shannon
  • Method for increased mine recovery and upgrading of lignite
    Patent number: 4619669
    Abstract: A method is disclosed for upgrading run-of-the-mine (ROM) lignites to remove the gangue (clays, rock etc.) which form ash when the lignite is burned. The unique features of the process, a combination of unit operations in a specified sequence, result in less loss of combustible fuel value without hydrodegradation (the production of a large volume of fines) normally associated with contact of the lignite with water as in pipeline transport of lignite.
    Type: Grant
    Filed: November 23, 1984
    Date of Patent: October 28, 1986
    Assignee: The Dow Chemical Company
    Inventors: Elvis E. Jones, Terry A. Pearce, Dacon C. Laird, III, James H. Everitt